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Manual Multi-Tech Systems DT102

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  • Multi-Tech Systems DT102 - page 1

    Data/V oice/Fax Concentrator Desktop Models: DT101, DT102, DT101/xx, DT102/xx Rack-Mount Models: DT101R, DT102R, DT101R/xx, DT102R/xx Owner ’ s Manual ...

  • Multi-Tech Systems DT102 - page 2

    Owner ’s Manual 82052704 Revision E DataT alker™ Series Desktop Models: DT101, DT101/xx, DT102, DT102/xx Rack-Mount Models: DT101R, DT101R/xx, DT102R, DT102R/xx This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-T ech Systems, Inc. All rights reserved. Copyright © 1997, by Multi-T ...

  • Multi-Tech Systems DT102 - page 3

    Contents Chapter 1 - Introduction and Description 1.1 Introduction ................................................................................................................ .................... 8 1.2 About This Manual ........................................................................................................... .............. 8 ...

  • Multi-Tech Systems DT102 - page 4

    Chapter 4 - Unpacking and Configuration 4.1 Introduction ................................................................................................................ .................. 44 4.2 Unpacking ................................................................................................................................... 44 4.3 Confi ...

  • Multi-Tech Systems DT102 - page 5

    Appendixes Appendix A - ASCII Conversion Chart ............................................................................................ ......... 1 18 Appendix B - RS-232C Interface Specification ................................................................................... ..... 1 19 Appendix C - Cabling Diagrams ......................... ...

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    ...

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    Chapter 1 - Introduction and Description ...

  • Multi-Tech Systems DT102 - page 8

    8 DataT alker Owner ’ s Manual 1.1 Introduction Congratulations! Y our new Multi-T ech DataT alker™ is one of the finest data/voice/fax concentrators on the market today . The DataT alker optimizes wide area network (WAN) links by simultaneously transmitting voice and/or fax with LAN or computer data over a single phone line, digital service, o ...

  • Multi-Tech Systems DT102 - page 9

    9 Chapter 1 - Introduction and Description Chapter 4 - Unpacking and Configuration This chapter describes the contents of the shipping container; provides a customizeable configuration summary; discusses configuration considerations for the data port, voice/fax channel, and the composite link; and provides a detailed configuration procedure. The co ...

  • Multi-Tech Systems DT102 - page 10

    10 DataT alker Owner ’ s Manual 1.3 Product Description The DataT alker series of multiplexers has a single synchronous or asynchronous data channel, a command port, one or two voice/fax channels, and a single synchronous composite link with an internal data service unit (DSU), modem, ISDN terminal adapter , or an external synchronous link device ...

  • Multi-Tech Systems DT102 - page 11

    11 Chapter 1 - Introduction and Description communications software to the DA T A/COMMAND connector on the back panel and configure the data channel for the type of data that is going to be transferred. For example, if an asynchronous device is going to be connected to the data channel, you must set the speed of the channel, the word length, the nu ...

  • Multi-Tech Systems DT102 - page 12

    12 DataT alker Owner ’ s Manual 1.4 System Features 1.4.1 V oice/Fax The voice/fax feature of the DataT alker allows you to establish voice or fax traf fic on top of your normal data communications over a composite link, saving the expense of extra communications lines. The DataT alker provides three types of telephone circuits (FXS, FXO, and E&a ...

  • Multi-Tech Systems DT102 - page 13

    13 Chapter 1 - Introduction and Description 1.4.6 Diagnostics Diagnostics in a network are of considerable importance. That is why the DataT alker is equipped with several diagnostic modes that will test every aspect of the network. The diagnostics include easy-to-execute tests for the data channel, voice/fax channel, composite link, and various co ...

  • Multi-Tech Systems DT102 - page 14

    14 DataT alker Owner ’ s Manual 1.5 FCC Regulations for T elephone Line Interconnection 1. This equipment complies with Part 68 of the FCC rules. On the outside surface of this equipment is a label that contains, among other information, the FCC registration number and ringer equivalence number (REN). If requested, this information must be provid ...

  • Multi-Tech Systems DT102 - page 15

    15 Chapter 1 - Introduction and Description 1.6 Canadian Limitations Notice Notice: The Canadian Department of Communications label identifies certificated equipment. This certification means that the equipment meets certain telecommunications network protective, operational and safety requirements. The department does not guarantee the equipment w ...

  • Multi-Tech Systems DT102 - page 16

    16 DataT alker Owner ’ s Manual 1.7 Specifications 1.7.1 Async Data Channel Number of Channels One Maximum Speed 1 15,200 bps Channel Speed All standard speeds from 300 bps to 1 15,200 bps Data Format 5, 6, 7, or 8 data bits, with 1, 1.5, or 2 stop bits Parity Odd, even, or none Local Echo On or off selectable Flow Control XON/XOFF , CTS, or HP E ...

  • Multi-Tech Systems DT102 - page 17

    17 Chapter 1 - Introduction and Description 1.7.5 Internal Modem Modulation ITU-T V .34; A T&T V .32 terbo; ITU-T V .32bis, V .32, V .22bis, V .22; Bell 212A and 103 (North America) or V .23 and V .21 (international) Speeds 300 bps to 33.6K bps Commands Fully A T command compatible Usage Synchronous full duplex over unconditioned 2-wire or 4-wi ...

  • Multi-Tech Systems DT102 - page 18

    18 DataT alker Owner ’ s Manual 1.7.9 Electrical/Physical Desktop Models: Power Supply Input 100 to 250 V AC Power Supply Output +5v@5A, +12v@1A, -12v@0.5A Power Consumption 20 watts Dimensions 2.3 " high x 9 " wide x 12.8 " deep 5.7 cm high x 22.9 cm wide x 32.7 cm deep Weight 7 pounds (3.2 kg) Rack-mount Models: Power Supply Inpu ...

  • Multi-Tech Systems DT102 - page 19

    Chapter 2 - Configuration ...

  • Multi-Tech Systems DT102 - page 20

    20 DataT alker Owner ’ s Manual 2.1 Introduction The Multi-T ech DataT alker is available in both desktop (DT10x) and rack-mount (DT10xR) versions. The desktop version is designed for home of fice applications. It is mounted in a horizontal cabinet and has an external power supply , a power switch, an originate switch, and a switch that allows yo ...

  • Multi-Tech Systems DT102 - page 21

    21 Chapter 2 - Configuration 2.2 Configuration 1 - Dial-Up Link Configuration 1 is a dial-up link using a pair of DataT alkers to provide data communications between a home of fice PC and the main of fice host computer and telephone services through the main of fice telephone system. The data and telephone services are provided using a single line ...

  • Multi-Tech Systems DT102 - page 22

    22 DataT alker Owner ’ s Manual When you established communication, the Main Menu appeared. From the Main Menu you can configure the unit, display statistics, reset various functions within the DataT alker , and run diagnostic tests: Main Menu 1 - Conf igurations 2 - Statistics 3 - Reset Options 4 - Diagnostics 5 - Exit Command Mode 6 - QUICK SET ...

  • Multi-Tech Systems DT102 - page 23

    23 Chapter 2 - Configuration Enter S and press ENTER to store all configurations for the main of fice. Set up the home office unit the same way , except that you should switch the local and remote interface types (FXS for the local interface and FXO for the remote interface). After you select the home of fice options, enter S to store all configura ...

  • Multi-Tech Systems DT102 - page 24

    24 DataT alker Owner ’ s Manual T o connect the home office DataT alker to its PC, connect an RS232C cable between the DA T A/ COMMAND connector on the DataT alker and an async port on the PC (typically , COM1 or COM2). Place DIP switch position 3 on the side of the DataT alker in the OPEN (up) position to enable the data channel. T o connect you ...

  • Multi-Tech Systems DT102 - page 25

    25 Chapter 2 - Configuration 2.3 Configuration 2 - MMH900 Series with V oice/Fax Configuration 2 adds voice capability to an existing data-only network using the same composite link. The example shown in Figure 2-2 had an existing data-only network consisting of a MultiMux MMH904C multiplexer connected to a host computer at the local site and a sec ...

  • Multi-Tech Systems DT102 - page 26

    26 DataT alker Owner ’ s Manual A series of configuration menus provides simple and complete configuration information for each aspect of the DataT alker . From the Main Menu, you can access menus to configure the unit, display statistics, reset various functions within the DataT alker , and run diagnostic tests: Main Menu 1 - Conf igurations 2 - ...

  • Multi-Tech Systems DT102 - page 27

    27 Chapter 2 - Configuration The data port in this configuration will be set up for synchronous operation. T o configure the data port for sync operation, enter 1 (Aysnc/Sync) option and change the default Async to Sync. The data port configuration menu displays the sync parameters. Data Port Configuration 1 - Async/Sync: Sync 2 - Speed: 19200 3 - ...

  • Multi-Tech Systems DT102 - page 28

    28 DataT alker Owner ’ s Manual 2.4 Configuration 3 - LAN to LAN Configuration 3 is an example of a pair of DataT alkers providing the link between two LANs with the added benefit of voice or fax traffic over the same composite link. Bridging the LANs over a single high speed composite link expands the capacity of each LAN. The LAN bridge on each ...

  • Multi-Tech Systems DT102 - page 29

    29 Chapter 2 - Configuration T o configure the DataT alker , enter 1 and press ENTER. The Configurations menu is displayed. From this menu you can configure the data port, voice/fax channel(s), or the composite link. Y ou can also select various factory defaults and store your current configuration: Configurations 1 - Data Port Configuration 2 - Vo ...

  • Multi-Tech Systems DT102 - page 30

    30 DataT alker Owner ’ s Manual Data Port Configuration 1 - Async/Sync: Sync 2 - Speed: 19200 3 - Clocking: Internal 4 - Idle Condition: Flags 5 - NRZ/NRZI Encoding: NRZ 6 - CRC Preset: All 1s 7 - Inter-frame Timer: Off S - Store All Configuations M - Main Menu P - Previous Menu Selection : _ Press P to return to the Data Port Configuration menu, ...

  • Multi-Tech Systems DT102 - page 31

    31 Chapter 2 - Configuration The DataT alker knows the type of link device being used by the way a DIP switch is set or by detecting a device installed on the main PC board. In this configuration, a 56K bps internal DSU is used for the composite link device, so when the Composite Link Settings menu is displayed, it is for a DSU: Composite Link Sett ...

  • Multi-Tech Systems DT102 - page 32

    32 DataT alker Owner ’ s Manual 2.5 Configuration 4 - PBX to PBX Configuration 4 is a data/voice/fax configuration that uses two DataT alkers to link two PBXs. Using a single ISDN composite link, they connect a minicomputer and a PBX E&M trunk at the local site to a remote PC on the data part of the network and a second PBX E&M trunk on t ...

  • Multi-Tech Systems DT102 - page 33

    33 Chapter 2 - Configuration The Configurations menu is displayed. From this menu you can configure the data port, voice/fax channel(s), or the composite link. Y ou can also select various factory defaults and store your current configuration. Configurations 1 - Data Port Configuration 2 - Voice/Fax Channel(s) Configuration 3 - Composite Link Confi ...

  • Multi-Tech Systems DT102 - page 34

    34 DataT alker Owner ’ s Manual Composite Link Settings - Inter nal TA 1 - On-Line XMT Rate: 128000 2 - Configure TA 3 - DOD/DOI: Off S - Store All Conf igurations M - Main Menu P - Previous Menu Selection : _ The terminal adapter menu displays the transmit rate and option 2 allows you to configure the terminal adapter . Use option 2 (Configure T ...

  • Multi-Tech Systems DT102 - page 35

    Chapter 3 - Front and Rear Panel Descriptions ...

  • Multi-Tech Systems DT102 - page 36

    36 DataT alker Owner ’ s Manual 3.1 Introduction This chapter describes the DataT alker front and back panels and switches. The front panel contains LED indicators for the data channel device, voice/fax channels, and the composite link. It also contains one or two switches, depending on whether it is a desktop or rack version. The back panel cont ...

  • Multi-Tech Systems DT102 - page 37

    37 Chapter 3 - Front and Rear Panel Descriptions V oice/Fax Channels FXS (Foreign Exchange Station) This indicator lights when the voice/fax channel is configured for FXS operation. FXO (Foreign Exchange Office) This indicator lights when the voice/fax channel is configured for FXO operation. E&M (E&M Operation) This indicator lights when t ...

  • Multi-Tech Systems DT102 - page 38

    38 DataT alker Owner ’ s Manual 28.8/56 (28.8K bps/56K bps) This composite link speed indicator displays the baud rate of the internal modem (28.8) or DSU (56K). The type of composite link device is indicated by which of the EXT , MDM, DSU, or T A indicators lights. This indicator lights steadily when a DSU is installed. It has three states when ...

  • Multi-Tech Systems DT102 - page 39

    39 Chapter 3 - Front and Rear Panel Descriptions 3.3 Connectors The cable connections for the DataT alker are made at the back panel. Refer to Chapter 5 for cabling installation procedures. Refer to Appendix C for cabling diagrams. The DataT alker back panel is shown in Figure 3-2. MODEM DSU/T A DIAL-UP LEASED DIGITAL VOICE/FAX CHANNEL 1 FXO FXS EX ...

  • Multi-Tech Systems DT102 - page 40

    40 DataT alker Owner ’ s Manual 3.3.7 VOICE/F AX CHANNEL 1 E&M Connector Use the E&M connector to connect the DataT alker to the E&M connector on an analog PBX trunk when linking two PBXs together . The E&M connector is an RJ-48 jack. This connector is available on voice/fax channel 1 only . 3.3.8 DSU/T A DIGIT AL Connector Use th ...

  • Multi-Tech Systems DT102 - page 41

    41 Chapter 3 - Front and Rear Panel Descriptions 3.4 Switches and Shunts DataT alker switches include one or two switches on the front panel, a power switch on the back panel of the desktop version, and a DIP switch and shunt on the main printed circuit board (Figures 3-3 and 3-4). 1 2 3 4 5 6 RS-232 Shunt V .35 Shunt DIP Switch Originate Switch 10 ...

  • Multi-Tech Systems DT102 - page 42

    42 DataT alker Owner ’ s Manual 3.4.3 DIP Switch The eight-position DIP switch is accessible through a cutout in the left side of the DataT alker series enclosure; its location is shown in Figures 3-3 and 3-4. Position 1: Not used Position 2 : OPEN (up) Internal composite link device selected Closed (down) External composite link device selected ...

  • Multi-Tech Systems DT102 - page 43

    Chapter 4 - Unpacking and Configuration ...

  • Multi-Tech Systems DT102 - page 44

    44 DataT alker Owner ’ s Manual 4.1 Introduction This chapter describes what to expect in your DataT alker shipping box, then describes how to configure the DataT alker . It provides a helpful configuration summary to give you a snapshot of how your unit is set up; summarizes options you should consider when configuring the data channel, router p ...

  • Multi-Tech Systems DT102 - page 45

    45 Chapter 4 - Unpacking and Configuration 4.3 Configuration Summary The following chart shows possible configurations for your DataT alker . Use it as a snapshot of how your unit is set up. Circle the parameters that apply to your unit. For example, if your unit has the data channel set up for asynchronous communications, circle “Async.” Data ...

  • Multi-Tech Systems DT102 - page 46

    46 DataT alker Owner ’ s Manual 4.5 V oice/Fax Channel Configuration Considerations When configuring the voice/fax channels on your DataT alker , the first question you should ask yourself is what the voice/fax port is connected to. The possibilities are an in-plant telephone switch, or PBX, (Private Branch eXchange); a PBX E&M trunk; or a te ...

  • Multi-Tech Systems DT102 - page 47

    47 Chapter 4 - Unpacking and Configuration 4.6 Composite Link Configuration Considerations The composite link configuration depends on the type of device used as the composite link device. The DataT alker knows the type of composite link device being used by the setting of a DIP switch and the sensing of conditions within the unit. In most cases yo ...

  • Multi-Tech Systems DT102 - page 48

    48 DataT alker Owner ’ s Manual 4.7 Configuration Procedure Table 4-1. Configuration Procedure Step Procedure 1 Review the configuration considerations for the data port, the voice/fax channel, and the composite link in the previous sections. 2 Place DIP switch position 3 in the down (closed) position to enable the command port. MODEM DSU/TA DIAL ...

  • Multi-Tech Systems DT102 - page 49

    49 Chapter 4 - Unpacking and Configuration 6 Apply power to the terminal or PC. Run your PC communications software in terminal mode. Press the ENTER key twice to establish communications with the DataT alker; the Main Menu then appears: Main Menu 1 - Conf igurations 2 - Statistics 3 - Reset Options 4 - Diagnostics 5 - Exit Command Mode 6 - QUICK S ...

  • Multi-Tech Systems DT102 - page 50

    50 DataT alker Owner ’ s Manual 9 Configure the data port to meet the conditions of your installation by selecting option numbers from the menus. Refer to Chapter 6 for a description of the Data Port Configuration menu options. For example, if you are setting up the data port as a sync data channel, enter number 1 and press ENTER. The Data Port A ...

  • Multi-Tech Systems DT102 - page 51

    51 Chapter 4 - Unpacking and Configuration 12 Configure voice/fax channel 1 to meet the conditions of your installation by selecting option numbers from the menus. • Accept the defaults for the first five options. • Select the local interface type (option 6). • Select the remote interface type (option 1 1). The remote interface option does no ...

  • Multi-Tech Systems DT102 - page 52

    52 DataT alker Owner ’ s Manual • Configure the internal MMH2834 modem to meet the conditions of your installation by selecting option numbers from the menus. • If you are setting up DTR dialing, select option 1, Enter A T Commands to 2834. W ait 5 seconds and then enter the following commands (press ENTER after each command): A TDT [Number M ...

  • Multi-Tech Systems DT102 - page 53

    53 Chapter 4 - Unpacking and Configuration T o verify and/or change the terminal adapter ’ s configuration, select option 2, wait 5 seconds, and enter A T!V to access the terminal adapter ’s configuration menu. Refer to the ISDN T erminal Adapter Owner ’ s Manual for configuration commands. T o exit the terminal adapter ’s configuration men ...

  • Multi-Tech Systems DT102 - page 54

    54 DataT alker Owner ’ s Manual ...

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    Chapter 5 - Installation ...

  • Multi-Tech Systems DT102 - page 56

    56 DataT alker Owner ’ s Manual 5.1 Introduction This chapter describes how to connect the DataT alker to your system (T able 5-1) and how to move the RS232/V .35 shunt when a V .35 interface is used (T able 5-2). Then it describes how to power on your DataT alker , check that the unit is cabled and configured correctly , and what to do if you ru ...

  • Multi-Tech Systems DT102 - page 57

    57 Chapter 5 - Installation MMH2834 Modem, Leased Line Connect the RJ-1 1 phone cable supplied with the DataT alker from the internal modem LEASED connector on the back panel to the leased line connection. MODEM DSU/TA DIAL-UP LEASED DIGITAL VOICE/FAX CHANNEL 1 FXO FXS EXTERNAL COMPOSITE DATA/COMMAND RS232C/V.35 E&M INTERNAL COMPOSITE POWER GND ...

  • Multi-Tech Systems DT102 - page 58

    58 DataT alker Owner ’ s Manual External Modem, DSU, or ISDN T erminal Adapter 3 If the external device has an RS232 interface, connect the composite link cable supplied with the DataT alker from the EXTERNAL COMPOSITE RS232C/V .35 connector on the back panel to the external device. MODEM DSU/TA DIAL-UP LEASED DIGITAL VOICE/FAX CHANNEL 1 FXO FXS ...

  • Multi-Tech Systems DT102 - page 59

    59 Chapter 5 - Installation If you are connecting the voice/fax channel to the station side of a PBX, connect an RJ-1 1 phone cable from the VOICE/FAX CHANNEL FXO connector on the DataT alker to the station side of the PBX. Refer to the PBX manual for the station side connection. MODEM DSU/TA DIAL-UP LEASED DIGITAL VOICE/FAX CHANNEL 1 FXO FXS EXTER ...

  • Multi-Tech Systems DT102 - page 60

    60 DataT alker Owner ’ s Manual 5.3 V .35 Shunt Table 5-2. V.35 Shunt Procedure Step Procedure 1 Desktop version: Unplug the power supply from the back of the unit. Rack version: Remove the unit from the RackT alker rack. Go to step 4. 2 Desktop version only: T urn the unit upside down and remove the two cabinet mounting screws from the middle of ...

  • Multi-Tech Systems DT102 - page 61

    61 Chapter 5 - Installation 5.4 Power-On and Checkout The desktop and rack-mounted versions of the DataT alker differ in how power is applied. The desktop version has a power switch that you must turn on. The rack version has no power switch; you apply power by inserting it into a powered-up rack. It is always on as long as the rack is powered up. ...

  • Multi-Tech Systems DT102 - page 62

    62 DataT alker Owner ’ s Manual 6 V erify that the voice/fax channel is connected at the remote site. One of the following conditions will apply depending on how your local and remote sites are set up: • If the local voice/fax channel is connected to a telephone switch in your facility (FXO connection) and the remote site has just a telephone ( ...

  • Multi-Tech Systems DT102 - page 63

    63 Chapter 5 - Installation V oice/Fax Channel If the voice/fax channel is not communicating with the remote site or the remote site cannot communicate with you, check the following items: • The channel configuration does not match how the channel is cabled. V erify that the channel configuration and cabling match. • The remote DataT alker does ...

  • Multi-Tech Systems DT102 - page 64

    64 DataT alker Owner ’ s Manual ...

  • Multi-Tech Systems DT102 - page 65

    Chapter 6 - Menus ...

  • Multi-Tech Systems DT102 - page 66

    66 DataT alker Owner ’ s Manual 6.1 Introduction The menu system for the DataT alker provides a set of user-friendly configuration menus that are accessible from a main menu. The Main Menu contains five options that allow you to configure your DataT alker , display statistics, reset options, run diagnostic tests, and exit the command mode. Main M ...

  • Multi-Tech Systems DT102 - page 67

    67 Chapter 6 - Menus 6.2.1 Data Port Configuration The Data Port Configuration menu allows you to configure the data channel for either asynchronous or synchronous operation, depending on the type of device connected to the channel. If the port is configured for synchronous operation, refer to Sync Data Port Configuration. When the port is configur ...

  • Multi-Tech Systems DT102 - page 68

    68 DataT alker Owner ’ s Manual The Echo option enables data entered on the channel device keyboard to be returned to the channel device monitor . The purpose of this option is so that an operator will not experience undue delays in seeing entered data appear on their monitor . The default condition for the echo option is off. The Pacing option c ...

  • Multi-Tech Systems DT102 - page 69

    69 Chapter 6 - Menus 6.2.2 Sync Data Port Configuration The Data Port Configuration menu allows you to configure the data channel for either asynchronous or synchronous operation, depending on the type of device connected to the channel. When the port is configured for synchronous operation, the following Data Port Configuration menu displays the d ...

  • Multi-Tech Systems DT102 - page 70

    70 DataT alker Owner ’ s Manual 6.2.3 V oice/Fax Channel Configuration The V oice/Fax Channel Configuration menu is displayed only if the second voice/fax channel card is installed in the DataT alker . If only one voice/fax channel is installed in the DataT alker , this menu does not appear . If you select the V oice/Fax Channel(s) Configuration ...

  • Multi-Tech Systems DT102 - page 71

    71 Chapter 6 - Menus The output level attentuation needs to be set at the DataT alker that is receiving (hearing). Increasing the output level gain at the transmitting DataT alker will have no affect on the loudness heard by the person at the receiving DataT alker: T alk OL Sounds 2db Increase Louder 2db T alk Sounds OL 2db Louder Increase 2db PSTN ...

  • Multi-Tech Systems DT102 - page 72

    72 DataT alker Owner ’ s Manual The Local Interface T ype option configures the local voice/fax channel interface. The options are for an FXS, FXO, or E&M interface. When the voice/fax channel is connected to a telephone set or fax machine, the local interface type must be FXS. When the voice/fax channel is connected to the station side of a ...

  • Multi-Tech Systems DT102 - page 73

    73 Chapter 6 - Menus 6.2.4 Composite Link Configuration The Composite Link Configuration menu that is displayed depends on whether an internal or external device is installed as well as on the position of DIP switch position 2. If DIP switch position 2 is in the up (OPEN) position and an internal MMH2834 modem installed, the Composite Link Settings ...

  • Multi-Tech Systems DT102 - page 74

    74 DataT alker Owner ’ s Manual The Dial/Leased option selects the type of connection to the telephone company . If the data line provided by the telephone company is a dial-up line, then you must select the dial option. The options are Dial and Leased with the default being Dial. The 2 or 4 Wire option selects how the MMH2834 modem is connected ...

  • Multi-Tech Systems DT102 - page 75

    75 Chapter 6 - Menus Composite Link Settings - Internal 56K DSU The Composite Link Settings - Internal DSU menu allows you to configure the composite link for a DSU. The default parameters for an internal DSU are displayed in the following menu: Composite Link Settings - Internal DSU 1 - Speed: 56k 2 - Clocking: DDS S - Store All Configurations M - ...

  • Multi-Tech Systems DT102 - page 76

    76 DataT alker Owner ’ s Manual The Dial On Demand (DOD)/Disconnect On Inactivity (DOI) option drops DTR to the terminal adapter to disconnect if the inactivity timer has expired and raises DTR to reconnect if the voice/ fax or data channel goes active. When this option is turned ON, a new menu is displayed. The default is to have the DOD/DOI opt ...

  • Multi-Tech Systems DT102 - page 77

    77 Chapter 6 - Menus Composite Link Settings - External Device The Composite Link Settings - External Device menu allows you to configure the composite link for an external device. The default parameters for an external device are displayed in the following menu: Composite Link Settings -External Device 1 - On-Line XMT Rate: 56000 2 - Clocking: Ext ...

  • Multi-Tech Systems DT102 - page 78

    78 DataT alker Owner ’ s Manual 6.3 Statistics The Statistics menu allows you display or clear the composite link statistics, or return to the previous menu or to the Main Menu. Statistics 1 - View Composite Link Statistics 2 - Clear Composite Link Statistics M - Main Menu P - Previous Menu Selection : _ T o display or clear the composite link st ...

  • Multi-Tech Systems DT102 - page 79

    79 Chapter 6 - Menus 6.4 Reset Options The Reset Options menu allows you to reset the unit, the data and voice/fax channels, each voice/fax channel, or just the data channel. Reset Options 1 - Reset Unit 2 - Reset Data and V oice/F ax Channels 3 - Reset V oice/F ax Channel 1 4 - Reset V oice/F ax Channel 2 5 - Reset Data Channel M - Main Menu P - P ...

  • Multi-Tech Systems DT102 - page 80

    80 DataT alker Owner ’ s Manual 6.5.1 Loop T ests The Loop T ests menu provides either a voice loopback or a composite link loopback that depends on the type of link device. Loop T ests 1 - V oice Loopback 2 - Composite Link Loopback M - Main Menu P - Previous Menu Selection : _ The following messages are displayed, depending on the loopback test ...

  • Multi-Tech Systems DT102 - page 81

    81 Chapter 6 - Menus 6.6 Configure Remote Unit Configuration menu option 5 is dependent on the position of DIP switch SW -5. If DIP switch SW - 5 is in the Open (Up) position (MMV8/16/32), the configuration menu allows for the DataT alker to set parameters to communicate with with other MultiMux products (i.e., MMV800, MMV1600, or MMV3200 series). ...

  • Multi-Tech Systems DT102 - page 82

    82 DataT alker Owner ’ s Manual The Unit Source Node option specifies the node number of the local node. This number has to be unique and any number from 0 to 9. Remember that the node number will be used by other nodes. The Data Destination Node option specifies the node number of the remote node. This number has to be unique and any number from ...

  • Multi-Tech Systems DT102 - page 83

    83 Chapter 6 - Menus Table 6-1. Main Office Installation Step Procedure 1 V oice/Fax - Plug an analog PBX extension into the FXO jack on the back of the Data T alker . RJ1 1 Phone Cable VOICE/F AX CHANNEL 1 FXO Connector DAT A/COMMAND EXTERNAL COMPOSITE RS232C/V .35 0 1 DIAL-UP LEASED DIGITAL FXS FXO MODEM DSU VOICE/FAX CHANNEL 1 VOICE/FAX CHANNEL ...

  • Multi-Tech Systems DT102 - page 84

    84 DataT alker Owner ’ s Manual 3 Data Port - Plug the host computer into the Data/Command port and put dip switch 3 up (located on the side of the Data T alker). MODEM DSU/TA DIAL-UP LEASED DIGITAL VOICE/FAX CHANNEL 1 FXO FXS EXTERNAL COMPOSITE DATA/COMMAND RS232C/V.35 E&M INTERNAL COMPOSITE POWER GND DA T A/COMMAND Connector RS232 Cable Con ...

  • Multi-Tech Systems DT102 - page 85

    85 Chapter 6 - Menus Table 6-2. Home Office Installation Step Procedure 1 V oice/Fax - Plug your telephone into the FXS jack on the back of the Data T alker . MODEM DSU/TA DIAL-UP LEASED DIGITAL VOICE/FAX CHANNEL 1 FXO FXS EXTERNAL COMPOSITE DATA/COMMAND RS232C/V.35 E&M INTERNAL COMPOSITE POWER GND VOICE/FAX CHANNEL 2 RJ-1 1 Phone Cable VOICE/F ...

  • Multi-Tech Systems DT102 - page 86

    86 DataT alker Owner ’ s Manual 3 Data Port - Plug your PC into the Data/Command port and put dip switch 3 up to exit command mode and enable data mode (located on the side of the Data T alker). MODEM DSU/TA DIAL-UP LEASED DIGITAL VOICE/FAX CHANNEL 1 FXO FXS EXTERNAL COMPOSITE DAT A/COMMAND RS232C/V.35 E&M INTERNAL COMPOSITE POWER GND DA T A/ ...

  • Multi-Tech Systems DT102 - page 87

    Chapter 7 - T roubleshooting ...

  • Multi-Tech Systems DT102 - page 88

    88 DataT alker Owner ’ s Manual 7.1 Introduction The DataT alker is designed to be easy to operate and maintain. The procedures in this chapter will help isolate any problem to a specific network component, at which point you will be instructed to call the appropriate personnel or execute commands to adjust operating conditions. Y ou are not expe ...

  • Multi-Tech Systems DT102 - page 89

    89 Chapter 7 - T roubleshooting 7.3 T est Cables If you are using the DataT alker internal DSU or MMH2834 modem, there are three test cables you can use to check out your system. T wo DataT alker back-to-back test cables allow you to connect your two DataT alkers locally before installing them on either end of a phone line. There is also a composit ...

  • Multi-Tech Systems DT102 - page 90

    90 DataT alker Owner ’ s Manual 7.4 T roubleshooting Guide This troubleshooting guide is designed to help you pinpoint the cause of your problem and correct it as quickly as possible. Because equipment from different manufacturers is typically involved in multiplexer networks, you may encounter “finger pointing” as to who is at fault. Who is ...

  • Multi-Tech Systems DT102 - page 91

    91 Chapter 7 - T roubleshooting Table 7-1. Command Port Troubleshooting Problem Command port device not communication with DataT alker Possible Causes Communications software not installed on command port PC Command port not enabled Bad cable or cable connection Solution 1. Install communications software on command port PC (refer to communcations ...

  • Multi-Tech Systems DT102 - page 92

    DataT alker Owner ’ s Manual 92 Table 7-2. Composite Link Troubleshooting Internal DSU Problem Composite link down with CD, CTS, XMT , RD and RCV LEDs on Flashing RXT LED Possible Causes Composite link not configured correctly High error rate on communication line DSU clocking configured incorrectly Solution 1. V erify DSU configuration. See Comp ...

  • Multi-Tech Systems DT102 - page 93

    93 Chapter 7 - T roubleshooting Internal ISDN Terminal Adapter Problem Composite link down with CTS, XMT and RD LEDs on Composite link down with CD, CTS, XMT , RCV and RD LEDs on Flashing RXT LED Possible Causes T erminal adapter not communicating with ISDN line Faulty communication line Composite link not configured correctly High error rate on co ...

  • Multi-Tech Systems DT102 - page 94

    DataT alker Owner ’ s Manual 94 Internal MMH2834 Modem Problem Composite link down with CTS, XMT , and RD LEDs on Composite link down with CD, CTS, XMT , RCV and RD LEDs on Flashing RXT LED Possible Causes MMH2834 modem not communicating with communications line Faulty communications line Composite link not configured correctly High error rate on ...

  • Multi-Tech Systems DT102 - page 95

    95 Chapter 7 - T roubleshooting External Composite Link Device Problem Composite link down with CTS, XMT and RD LEDs on Composite link down with CD, CTS, XMT , RCV and RD LEDs on Flashing RXT LED Composite link down with CD, CTS and RD LEDs on Possible Causes Composite link not communicating with communications line Faulty communications line Compo ...

  • Multi-Tech Systems DT102 - page 96

    DataT alker Owner ’ s Manual 96 Table 7-3 Data Channel Troubleshooting Problem Async Data Channel Channel Device not communicating with DataT alker; composite link up with CD,, CTS, XMT , RCV and RD LEDs on Async Data Channel device losing data Sync Data Channel Channel Device not communicating with DataT alker; composite link up with CD,, CTS, X ...

  • Multi-Tech Systems DT102 - page 97

    97 Chapter 7 - T roubleshooting Table 7-4. Voice/Fax Troubleshooting Problem V olume levels not sufficient on local voice/fax channel Local telephone goes off-hook and remote telephone does not ring (FXS to FXS configuration) Data throughput slows excessively when voice/fax channel is active FXO to FXO configuration - local telephone does not ring ...

  • Multi-Tech Systems DT102 - page 98

    DataT alker Owner ’ s Manual 98 Table 7-4. Voice/Fax Troubleshooting (continued) Problem V oice conversation or fax traffic becomes erratic after changing the remote interface type No communication on voice/fax channel Possible Causes Remote connection is different from remote interface type Composite link down Phone cord for the voice or fax mac ...

  • Multi-Tech Systems DT102 - page 99

    99 Chapter 7 - T roubleshooting 7.5 Composite Link Settings - Internal DSU Table 7-5. Composite Link Settings - Internal DSU Step Procedure 1 T oggle DIP switch position 3 to the down (closed) position to enable the command port. 2 Connect a terminal or PC running communications software to the DA T A/COMMAND connector on the back panel of the Data ...

  • Multi-Tech Systems DT102 - page 100

    100 DataT alker Owner ’ s Manual 7.6 Composite Link Settings - Internal ISDN T erminal Adapter Table 7-6. Composite Link Settings - Internal ISDN Terminal Adapter Step Procedure 1 T oggle DIP switch position 3 to the down (closed) position to enable the command port. 2 Connect a terminal or PC running communications software to the DA T A/COMMAND ...

  • Multi-Tech Systems DT102 - page 101

    101 Chapter 7 - T roubleshooting 7.7 Composite Link Settings - Internal Modem Table 7-7. Composite Link Settings - Internal MMH2834 Step Procedure 1 T oggle DIP switch position 3 to the down (closed) position to enable the command port. 2 Connect a terminal or PC running communications software to the DA T A/COMMAND connector on the back panel of t ...

  • Multi-Tech Systems DT102 - page 102

    102 DataT alker Owner ’ s Manual 7.8 Composite Link Settings - External Device Table 7-8. Composite Link Settings - External Device Step Procedure 1 T oggle DIP switch position 3 to the down (closed) position to enable the command port. 2 Connect a terminal or PC running communications software to the DA T A/COMMAND connector on the back panel of ...

  • Multi-Tech Systems DT102 - page 103

    103 Chapter 7 - T roubleshooting 7.9 Composite Link Statistics Table 7-9. Composite Link Statistics Step Procedure 1 T oggle DIP switch position 3 to the down (closed) position to enable the command port. 2 Connect a terminal or PC running communications software to the DA T A/COMMAND connector on the back panel of the DataT alker . Note: Any cable ...

  • Multi-Tech Systems DT102 - page 104

    104 DataT alker Owner ’ s Manual 7 Comparing Data Blocks T ransmitted with Data Blocks Retransmitted (the number of retransmits needed to get the data through) can indicate a line problem. Comparing Data Blocks Received with Receive Block Errors can indicate the same problem from the other end of the link. Numbers that you might encounter could b ...

  • Multi-Tech Systems DT102 - page 105

    105 Chapter 7 - T roubleshooting 7.10 Data Port Configuration Table 7-10. Data Port Configuration Step Procedure 1 T oggle DIP switch position 3 to the down (closed) position to enable the command port. 2 Connect a terminal or PC running communications software to the DA T A/COMMAND connector on the back panel of the DataT alker . Note: Any cables ...

  • Multi-Tech Systems DT102 - page 106

    106 DataT alker Owner ’ s Manual 7 If the data port is set up as an asynchronous data channel, you should verify all 12 options. Data Port Configuration 1 - Async/Sync: Sync 2 - Speed: 19200 3 - Clocking: Internal 4 - Idle Condition: Flags 5 - NRZ/NRZI Encoding: NRZ 6 - CRC Preset: All 1s 7 - Inter-frame Timer: Off S - Store All Configuations M - ...

  • Multi-Tech Systems DT102 - page 107

    107 Chapter 7 - T roubleshooting 7.1 1 V oice/Fax Channel Configuration Table 7-11. Voice/Fax Channel Configuration Step Procedure 1 T oggle DIP switch position 3 to the down (closed) position to enable the command port. 2 Connect a terminal or PC running communications software to the DA T A/COMMAND connector on the back panel of the DataT alker . ...

  • Multi-Tech Systems DT102 - page 108

    108 DataT alker Owner ’ s Manual Voice/Fax Channel 1 Configuration 1 - Destination Channel : 1 2 - Digitizing Rate : 9600 3 - Output Level Atten. : 12 4 - Input Level Gain : 03 5 - Silence Suppression : Off 6 - Local Interface Type : FXS 7 - Ground/Loop Start (FXS) : Loop 8 - 2 or 4 Wire (E&M) : N/A 9 - Dialtone/Wink (E&M) : N/A 10 - Wink ...

  • Multi-Tech Systems DT102 - page 109

    109 Chapter 7 - T roubleshooting 7.12 Diagnostic T esting Table 7-12. Diagnostic Testing Step Procedure 1 T oggle DIP switch position 3 to the down (closed) position to enable the command port. 2 Connect a terminal or PC running communications software to the DA T A/COMMAND connector on the back panel of the DataT alker . Note: Any cables connected ...

  • Multi-Tech Systems DT102 - page 110

    110 DataT alker Owner ’ s Manual ...

  • Multi-Tech Systems DT102 - page 111

    Chapter 8 - W arranty , Service and T ech Support ...

  • Multi-Tech Systems DT102 - page 112

    112 DataT alker Owner ’ s Manual 8.1 Introduction This chapter begins with your DataT alker ’s 2-year warranty . Read carefully the next section, “T ech Support,” if you have questions about or problems with your DataT alker . It includes the technical support telephone numbers, space for recording your product information, and an explanati ...

  • Multi-Tech Systems DT102 - page 113

    113 Chapter 8 - W arranty , Service and T ech Support 8.3 T ech Support Multi-T ech has an excellent staff of technical support personnel available to help you get the most out of your Multi-T ech product. If you have any questions about the operation of this unit, call 1- 800-972-2439. Please fill out the DataT alker information form below and hav ...

  • Multi-Tech Systems DT102 - page 114

    114 DataT alker Owner ’ s Manual 8.4 The Multi-T ech BBS For customers who do not have Internet access, Multi-T ech maintains a bulletin board system (BBS) that mirrors its FTP site. Information available from the BBS includes new product information, product upgrade files, and problem-solving tips. The phone number for the Multi- T ech BBS is (8 ...

  • Multi-Tech Systems DT102 - page 115

    115 Chapter 8 - W arranty , Service and T ech Support 6. Select a file transfer protocol by typing the indicated letter , such as Z for Zmodem (the recommended protocol). 7. If you select Zmodem, the file will transfer automatically . If you select another protocol, you may have to initiate the transfer yourself. (In most data communications progra ...

  • Multi-Tech Systems DT102 - page 116

    116 DataT alker Owner ’ s Manual ...

  • Multi-Tech Systems DT102 - page 117

    Appendixes ...

  • Multi-Tech Systems DT102 - page 118

    118 DataT alker Owner ’ s Manual Appendix A - ASCII Conversion Chart CTRL CODE HEX DE C CODE HE X DEC CODE HEX DEC CODE H EX DEC @ NUL 00 0 SP 20 32 @ 40 64 ` 60 96 A SOH 01 1 ! 21 33 A 41 65 a 61 97 B STX 02 2 “ 22 34 B 42 66 b 62 98 C ETX 03 3 # 23 35 C 43 67 c 63 99 D EOT 04 4 $ 24 36 D 44 68 d 64 100 E ENQ 05 5 % 25 37 E 45 69 e 65 101 F AC ...

  • Multi-Tech Systems DT102 - page 119

    119 Appendix B - RS-232C Interface Specification Appendix B - RS-232C Interface Specification The DataT alker's RS232C interface circuits have been designed to meet the electrical specifications given in the EIA (Electronic Industries Association) RS232C and ITU-T (International T elecommunications Union) V .24 standards. All signals generated ...

  • Multi-Tech Systems DT102 - page 120

    120 DataT alker Owner ’ s Manual Appendix C - Cabling Diagrams Channel Cables DCE to Channel Cabling (with EIA pass-through) PIN NO. 1 2 3 4 5 6 7 8 20 22 25 1 2 3 4 5 6 7 8 20 22 25 To DCE Device (Data Communications Equipment, i.e., Modem) CHASSIS GROUND (AA) TRANSMIT DA T A (BA) RECEIVE DA T A (BB) REQUEST T O SEND (CA) CLEAR TO SEND (CB) DA T ...

  • Multi-Tech Systems DT102 - page 121

    121 Appendix C - Cabling Diagrams Composite Link Cabling PIN NO. 1 2 3 4 5 7 8 15 17 20 25 1 2 3 4 5 7 8 15 17 20 25 To External Synchronous Modem/DSU/ T erminal Adapter Connector CHASSIS GROUND (AA) TRANSMIT DA TA (BA) RECEIVE DA T A (BB) REQUEST T O SEND (CA) CLEAR TO SEND (CB) SIGNAL GROUND (AB) CARRIER DETECT (CF) TRANSMIT CLOCK (DB) RECEIVE CL ...

  • Multi-Tech Systems DT102 - page 122

    122 DataT alker Owner ’ s Manual RJ-48 Cable for Internal ISDN T erminal Adapter 1 2 3 4 5 6 7 8 T R RJ-48 Cable for Internal DSU 1 2 3 4 5 6 7 8 RT RR { { Receive T ransmit RT RR Frame Ground (AA) Receive Data (BB) Transmit Data (BA) Clear T o Send (CB) Request T o Send (CA) Signal Ground (AB) Data T erminal Ready (CD) Internal Clock Data Set Re ...

  • Multi-Tech Systems DT102 - page 123

    123 Appendix C - Cabling Diagrams E&M Voice/Fax Channel Cable White-Green Green-White White-Orange White-Blue Blue-White Orange-White Brown-White White-Brown M Input E Output T1 4-Wire Output R 4-Wire Input, 2-Wire T 4-Wire Input, 2-Wire R1 4-Wire Output SG (Signal Ground) Output SB (Signal Battery) Output E&M CABLE RJ45 Plug * Cable wire i ...

  • Multi-Tech Systems DT102 - page 124

    124 DataT alker Owner ’ s Manual Appendix D - Flow Control Background Flow control refers to techniques used by computer devices and the DataT alker to stop and restart the flow of data between them. Flow control prevents a channel device or DataT alker from receiving more data than it can handle. Flow control initiated by the DataT alker is call ...

  • Multi-Tech Systems DT102 - page 125

    125 Appendix E - MMH2834 Modem S-Registers Appendix E - MMH2834 Modem S-Registers Introduction This section describes the MMH2834 memory locations called S-registers , where certain MMH2834 modem configurations are stored. Each S-register is assigned a number (S0, S1, S2, etc.). Use the S command to read and/or change the value stored in an S-regis ...

  • Multi-Tech Systems DT102 - page 126

    126 DataT alker Owner ’ s Manual S11 Tone Dialing: Tone Spacing and Duration Unit: 1 m s Range: 1–255, 80–255*, 80–255*** Default: 70, 80*, 80*** Description: S1 1 sets the speed of tone dialing (spacing and tone duration times). The default value is 70 units (Decimal 7) or 80 units, where each unit is one ms, meaning that each tone is on f ...

  • Multi-Tech Systems DT102 - page 127

    127 Appendix F - MMH2834 Modem Commands Appendix F - MMH2834 Modem Commands F .1 Introduction Before you can enter commands for the MMH2834 internal composite link modem, you must access the modem using the composite link access enable command ( #CLA1 ). When you have configured the MMH2834 modem, disable access from the command port to the composi ...

  • Multi-Tech Systems DT102 - page 128

    128 DataT alker Owner ’ s Manual TYPE COMMAND DESCRIPTION Configure #L0 Negotiate V42 Mode During Handshake Error #L 1 MNP On/LAPM Of f Correction #L2 LAPM On/MNP Of f (Section F .9) #L3 Direct LAPM/Phase Out Handshake $A Auto-Reliable Buf fering $F Enable/Disable Auto-Reliable Fallback Character $R Retransmit Count $E Error Correction at 300 bps ...

  • Multi-Tech Systems DT102 - page 129

    129 Appendix F - MMH2834 Modem Commands F . 2 Dialing Action Commands Dial Command D The letter D in a command causes the MMH2834 to dial the telephone number immediately following it. For example, if you enter A TD5551212 and hit RETURN, the MMH2834 dials the number 555-1212. The MMH2834 gives you several choices of dialing methods. Y ou can use t ...

  • Multi-Tech Systems DT102 - page 130

    130 DataT alker Owner ’ s Manual F .3 Dial Modifier Commands Pulse or Tone Dial P T The MMH2834 dials numbers using either pulse or tone dialing, or a combination of both methods. Pulse dialing is a method used by rotary-dial telephones, which involves the timed opening and closing of line relay . T one dialing is the method used by pushbutton (t ...

  • Multi-Tech Systems DT102 - page 131

    131 Appendix F - MMH2834 Modem Commands Wait for New Dialtone W A W inserted in the dialing command causes the MMH2834 to wait for another dial tone, and not resume dialing until another dial tone is detected. It is not necessary to enter a W at the beginning of the dialing command to wait for a modem dial tone, because the modem will do that first ...

  • Multi-Tech Systems DT102 - page 132

    132 DataT alker Owner ’ s Manual F . 4 Phone Number Memory Commands Storing Phone Numbers D...N A telephone number and command line of up to sixty characters may be stored in the MMH2834’s number memory . As many as ten of these numbers may be stored. Each number will be given a name, using the codes N0, N1, N2 up to N9. A phone number is store ...

  • Multi-Tech Systems DT102 - page 133

    133 Appendix F - MMH2834 Modem Commands F .5 Configuration and Default Storage Commands Store Configuration & S-Register Params. in Non-Volitile Memory & W The MMH2834 can store configuration parameters and S-register values in its non-volatile read/ write Random Access Memory (RAM) memory . The &W command does this, which prevents any ...

  • Multi-Tech Systems DT102 - page 134

    134 DataT alker Owner ’ s Manual F .6 Command Response (Result Code) Commands Echo Command Mode Characters E If the MMH2834 is connected to a full-duplex computer , it may be necessary for the modem to be configured to echo back characters entered while in the command mode in order for them to be displayed. The E command is used to configure the ...

  • Multi-Tech Systems DT102 - page 135

    135 Appendix F - MMH2834 Modem Commands TERSE VERBOSE 0O K 1 CONNECT 2 RING 3 NO CARRIER 4 ERROR 5* CONNECT 1200 6 NO DIAL TONE 7 BUSY 8 NO ANSWER 9* CONNECT 2400 1 1* CONNECT 4800 12* CONNECT 9600 13* CONNECT 14400 19* CONNECT 19200 21* CONNECT 21600 24* CONNECT 24000 26* CONNECT 26400 28* CONNECT 28800 * When error correction is used, the word RE ...

  • Multi-Tech Systems DT102 - page 136

    136 DataT alker Owner ’ s Manual The MMH2834 also can detect a distant busy signal, if after dialing, it reaches a busy number . This is useful because it allows the modem to immediately abandon a call, rather than wait 45 seconds for a carrier signal that will never come. The MMH2834 gives you a choice between the wait-for-dial-tone (“smart” ...

  • Multi-Tech Systems DT102 - page 137

    137 Appendix F - MMH2834 Modem Commands F . 7 Phone Line Conditioning Commands Enable or Disable Recognition of Remote Digital Loop Signal &T The MMH2834 has several self-test features (covered in Appendix G). The tests are activated with different U commands, such as A TU1 , and so fortF . The &T command is a phone line conditioning comman ...

  • Multi-Tech Systems DT102 - page 138

    138 DataT alker Owner ’ s Manual F .9 Error Correction Commands Y ou can use A T commands to place your MMH2834 one of three V .42 (error correction) modes of operation. V.42 Mode Select #L The V .42 standard implements both MNP Class 3 & 4 and LAP-M error correction methods. The V .42 Mode Select command ( #L ) selects which type of error co ...

  • Multi-Tech Systems DT102 - page 139

    139 Appendix F - MMH2834 Modem Commands Enable/Disable Auto-Reliable Fallback Character $F In Auto-Reliable mode, the modem is given four seconds to establish a Reliable connection. If a single CARRIAGE RETURN is received from the remote modem during this four second period, the Auto-Reliable modem assumes that the remote modem is not in Reliable m ...

  • Multi-Tech Systems DT102 - page 140

    140 DataT alker Owner ’ s Manual F .10 Compression and Maximum Block Size Commands Data Compression The data compression ( &E14 ) command enables data compression. Maximum Block Size &BS The maximum size of Reliable mode data blocks can be controlled with the &BS command. MNP 3 sends blocks of 1 to 64 characters. MNP 4 and 5 typically ...

  • Multi-Tech Systems DT102 - page 141

    141 Appendix F - MMH2834 Modem Commands F .1 1 Speed Conversion Commands Speed conversion is a necessary part of data compression since data must be presented to the modem faster than it can handle data, if data compression is to be effective. Speed conversion allows the MMH2834 to communicate at one speed over the phone line, and at another speed ...

  • Multi-Tech Systems DT102 - page 142

    142 DataT alker Owner ’ s Manual Serial Port Baud Rate $SB The $SB command presets the speed of the MMH2834's serial (RS232C) port, in both Originate and Answer modes. Speed conversion allows you to set this serial port baud rate at a fixed speed of up to 1 15,200 bps, regardless of the modem’s transmission speed setting. In order for this ...

  • Multi-Tech Systems DT102 - page 143

    143 Appendix F - MMH2834 Modem Commands F .12 Immediate Action Commands Help Screens $H The Help command is designed to give you short explanations on how to use each MMH2834 command. The Help command can be quite useful if your manual is not handy and you are in the middle of a communications session. Although the explanations are quite abbreviate ...

  • Multi-Tech Systems DT102 - page 144

    144 DataT alker Owner ’ s Manual Listing On-Line Diagnostics L8 The L8 command displays the current on-line CONNECT status status of the MMH2834. This display can be printed and used as a modem status report or as diagnostic information (such as when calling T ech Support).This report is given only when on-line. T o activate this command first ty ...

  • Multi-Tech Systems DT102 - page 145

    145 Glossary Glossary A AC (Alternating Current): A power source whose signal crosses a reference voltage (usually called ground or zero). Alternating between a maximum and minimum voltage, AC may also be referred to as a bipolar signal. Contrast with DC. ACK (ACKnowledgement code) (pronounced "ack"): A communications code sent from a rec ...

  • Multi-Tech Systems DT102 - page 146

    146 DataT alker Owner ’ s Manual BSC (Binary Synchronous Communications): Also called "bisync", this communications protocol was the first synchronous data format used by IBM. It is still in use, but is rapidly being replaced by IBM's newer Synchronous Data Link Control (SDLC). Bisync is a byte-synchronous protocol that has longer ...

  • Multi-Tech Systems DT102 - page 147

    147 Glossary De facto standards: A de facto standard is one of two types of voluntary standards recognized by a given market. It is introduced by a single vendor and becomes a standard by its widespread use and acceptance by other vendors. AT&T's Bell 212A, IBM's Binary Synchronous Protocol or DEC's VT-100 terminal protocol are e ...

  • Multi-Tech Systems DT102 - page 148

    148 DataT alker Owner ’ s Manual Flow control: The process of regulating the speed at which data enters or leaves a serial port. Software flow control is implemented by communications software or by the user sending predefined characters or packets which are recognized as "pause" and "resume" indicators. Hardware flow control ...

  • Multi-Tech Systems DT102 - page 149

    149 Glossary L Leased Line: A private, dedicated communications channel that connects two locations. This connection lasts for the duration of the subscription. Leased lines may be conditioned to improve line quality over that of dial-up lines. Line Conditioning: An additional cost option offered by the telephone company for their leased, voice-gra ...

  • Multi-Tech Systems DT102 - page 150

    150 DataT alker Owner ’ s Manual PCMCIA (personal computer memory card international association): An organization of U.S. and Japanese companies set up to standardize memory cards and other architecture-independent expansion devices. These cards are typically used in laptop computers. Phase: The timing of a signal based upon the starting point o ...

  • Multi-Tech Systems DT102 - page 151

    151 Glossary Synchronous Transmission: The transmission of data which involves sending a group of characters in a packet. This is a common method of transmission between computers on a network or between modems. One or more synchronous characters are transmitted to confirm clocking before each packet of data is transmitted. Compare to Asynchronous ...

  • Multi-Tech Systems DT102 - page 152

    152 DataT alker Owner ’ s Manual Index Symbols 2 or 4 Wire (E&M) option .................................... 7 2 2 or 4 Wire option ............................................... 74 A Answer mode ................................................... 138 Answer/Originate option ..................................... 74 ASCII code ............... ...

  • Multi-Tech Systems DT102 - page 153

    153 Index Dialtone/Wink (E&M) option ................................ 72 Digital data service (DDS) .................................. 10 Digital service unit (DSU) ................................... 10 Digitizing Rate option .......................................... 7 0 DIP switch .......................................................... 42 ...

  • Multi-Tech Systems DT102 - page 154

    154 DataT alker Owner ’ s Manual Remote Interface T ype option ............................. 72 REN .................................................................... 14 Ringer equivalence number ................................ 14 Rings until modem answers .............................. 125 RS232C/V .24 interface .............................. ...

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