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Manual Cabletron Systems SEH-22

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  • Cabletron Systems SEH-22 - page 1

    SEH-22 AND SEH-24 10BASE-T STACKABLE HUB USER’S GUIDE CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03866-5005 SEH Book Page 1 Tuesday, March 19, 1996 4:12 PM ...

  • Cabletron Systems SEH-22 - page 2

    SEH USER’S GUIDE i NOTICE Cabletron Systems reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes have been made. The hardware, firmware, or software described in this manual is subje ...

  • Cabletron Systems SEH-22 - page 3

    NOTICE ii SEH USER’S GUIDE FCC NOTICE This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. NOTE: This equipment has been test ...

  • Cabletron Systems SEH-22 - page 4

    NOTICE SEH USER’S GUIDE iii CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT IMPORTANT: Before utilizing this product, carefully read this License Agreement. This document is an agreement between you, the end user, and Cabletron Systems, Inc. (“Cabletron”) that sets forth your rights and obligations with respect to the Cabletron software pro ...

  • Cabletron Systems SEH-22 - page 5

    NOTICE iv SEH USER’S GUIDE EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY 1. EXCLUSION OF WARRANTY. Except as may be specifically provided by Cabletron in writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including Its documentation and media). CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO Y ...

  • Cabletron Systems SEH-22 - page 6

    SEH USER’S GUIDE v T ABLE OF CONTENTS CHAPTER 1 INTRODUCTION 1.1 USING THIS MANUAL ............................................................................ 1-1 1.2 GETTING HELP ...................................................................................... 1-2 1.3 SEH OVERVIEW ........................................................... ...

  • Cabletron Systems SEH-22 - page 7

    CONTENTS vi SEH USER’S GUIDE CHAPTER 5 TROUBLESHOOTING 5.1 INSTALLATION CHECK-OUT ................................................................. 5-1 5.2 USING LANVIEW .................................................................................... 5-2 APPENDIX A EPIM INFORMATION A.1 EPIM SPECIFICATIONS ..................................... ...

  • Cabletron Systems SEH-22 - page 8

    SEH USER’S GUIDE 1-1 CHAPTER 1 INTRODUCTION W elcome to the Cabletron Systems SEH-22 and SEH-24 10BASE-T Stackable Hubs User’s Guide . This manual pro vides installation instructions and reference information for the SEH-22 and SEH-24. 1.1 USING THIS MANUAL Read through this manual completely to familiarize yourself with its content and to gain ...

  • Cabletron Systems SEH-22 - page 9

    CHAPTER 1: INTRODUCTION 1-2 SEH USER’S GUIDE 1.2 GETTING HELP If you need additional support related to the Cabletron Systems SEH, or if you hav e any questions, comments, or suggestions concerning this manual, contact Cabletron Systems T echnical Support: By phone .......................... (603) 332-9400 Monday-Friday; 8am - 8pm Eastern Time By ...

  • Cabletron Systems SEH-22 - page 10

    SEH FEATURES SEH USER’S GUIDE 1-3 Stack up to five SEH hubs using Cabletron Systems e xternal HubST A CK Interconnect cables. Manage the stack by using the Cabletron Systems MicroMMA C or SEHI (Stackable Ethernet Hub with Intelligence). Up to four SEH hubs can be stacked with one intelligent hub . Stackable configurations make it possible to ma ...

  • Cabletron Systems SEH-22 - page 11

    CHAPTER 1: INTRODUCTION 1-4 SEH USER’S GUIDE 1.5 STACKABLE CAPABILITIES The SEH is a non-intelligent hub designed to be managed by a Cabletron Systems intelligent hub such as the SEHI or the MicroMMA C. Intelligent hubs serve as the logical “top” of the stack. The y manage all SEH hubs in the stack, providing full pack et and error statistics ...

  • Cabletron Systems SEH-22 - page 12

    OPTIONAL FEATURES SEH USER’S GUIDE 1-5 T able 1-2 lists the board revision requirements for EPIMs used in the SEH-24. The board re vision number is located on the EPIM’ s printed circuit board directly after the part number as sho wn in Figure 1-2. Figure 1-2. EPIM Board Revision Number Table 1-2. EPIM Board Revision Requirements EPIM EPIM BO A ...

  • Cabletron Systems SEH-22 - page 13

    CHAPTER 1: INTRODUCTION 1-6 SEH USER’S GUIDE HubSTACK Interconnect Cables Use Cabletron HubST A CK Interconnect cables to stack hubs together . T able 1-3 lists the part number and application for each cable. Rack Mount Capabilities The SEH can be installed in a 19-inch rack. Cabletron of fers an accessory package that includes the brackets, a st ...

  • Cabletron Systems SEH-22 - page 14

    SEH USER’S GUIDE 2-1 CHAPTER 2 INST ALLA TION REQUIREMENTS/SPECIFICA TIONS This chapter describes network guidelines, po wer requirements, and operating specifications for the SEH. Be sure to read this chapter before you install the SEH. The netw ork must meet the requirements and conditions specified in this chapter to obtain satisfactory perf ...

  • Cabletron Systems SEH-22 - page 15

    CHAPTER 2: INSTALLATION REQUIREMENTS/SPECIFICATIONS 2-2 SEH USER’S GUIDE 2.1.2 10B ASE-T UTP and STP Cable Specifications The de vices and 10B ASE-T T wisted Pair Segments connected to the SEH 10B ASE-T T wisted Pair Netw ork Ports and EPIM-T module must meet the IEEE 802.3 10B ASE-T specifications sho wn below . Length The IEEE 802.3 10B ASE-T ...

  • Cabletron Systems SEH-22 - page 16

    CABLE SPECIFICATIONS SEH USER’S GUIDE 2-3 Delay The maximum propagation delay of a 10B ASE-T link segment must not exceed 1000 ns. This 1000 ns maximum delay limits the maximum link segment length to no greater than 200 meters. Crosstalk Crosstalk is caused by signal coupling between the dif ferent cable pairs contained within a multi-pair cable ...

  • Cabletron Systems SEH-22 - page 17

    CHAPTER 2: INSTALLATION REQUIREMENTS/SPECIFICATIONS 2-4 SEH USER’S GUIDE 2.2 NETWORK PORT SPECIFICATIONS The SEH-22 and SEH-24 network ports use shielded RJ45 connectors that support both STP and UTP cabling. Figure 2-1 sho ws the RJ45 pinouts. Figure 2-1. RJ45 Network Ports 2.3 TRANSCEIVER REQUIREMENTS When connecting an external netw ork segmen ...

  • Cabletron Systems SEH-22 - page 18

    OPERATING SPECIFICATIONS SEH USER’S GUIDE 2-5 2.4 OPERATING SPECIFICATIONS This section describes the operating specifications for the SEH. Cabletron Systems reserves the right to change these specifications at an y time without notice. General Delay Times (Start of Packets): Twisted Pair to EPIM- A 1.10 µ s Twisted Pair to Twisted Pair 1.00 ? ...

  • Cabletron Systems SEH-22 - page 19

    CHAPTER 2: INSTALLATION REQUIREMENTS/SPECIFICATIONS 2-6 SEH USER’S GUIDE Fault Protection: Each segment disconnects itself from the other segments if 32 consecutive collisions occur, or if the collision detector of a segment is on for longer than approximately 110 µ s. This fault protection resets automatically after one packet is transmitted or ...

  • Cabletron Systems SEH-22 - page 20

    OPERATING SPECIFICATIONS SEH USER’S GUIDE 2-7 Safety This unit meets the safety requirements of UL1950 (without D3 de viations), CSA C22.2 No. 950, and EN60950. EMI This unit meets the EMI requirements of FCC Part 15 Class A, EN55022 Class A and VCCI Class I. EMC This unit meets the EMC requirements of EN 50082-1 including: IEC 801-2 (ESD) le vel ...

  • Cabletron Systems SEH-22 - page 21

    SEH USER’S GUIDE 3-1 CHAPTER 3 INST ALLA TION This chapter outlines the procedure for attaching the SEH to a network as either a stackable or standalone de vice. Ensure that the network meets the guidelines and requirements outlined in Chapter 2, Installation Requirements/Specifications , before installing the SEH. 3.1 UNPACKING THE SEH Unpack t ...

  • Cabletron Systems SEH-22 - page 22

    CHAPTER 3: INSTALLATION 3-2 SEH USER’S GUIDE 3.2.1 T abletop or Shelf Installation The follo wing subsection provides guidelines for installation on a tabletop or shelf. Guidelines for Tabletop and Shelf Installation T abletop and shelf installations must be within reach of the network cabling and meet the requirements listed belo w: • A single ...

  • Cabletron Systems SEH-22 - page 23

    INSTALLING THE SEH SEH USER’S GUIDE 3-3 If the installation requires that the SEH be stacked, proceed to Section 3.2.5. Otherwise, continue by po wering-up the SEH as described in Section 3.3. 3.2.2 Rackmount Installation Requirements T o install the SEH in a 19-inch rack, Cabletron Systems offers an accessory kit that includes rack mount bracket ...

  • Cabletron Systems SEH-22 - page 24

    CHAPTER 3: INSTALLATION 3-4 SEH USER’S GUIDE Figure 3-2. SEH Rack Mounting Hardware 3.2.3 Attaching the Strain Relief Brac ket Attach the strain relief bracket to the front of the SEH as follo ws: 1. Locate the strain relief bracket and four 8-32 x 3/8" screws from the accessory kit (see Figure 3-2). 2. Attach the strain relief bracket to th ...

  • Cabletron Systems SEH-22 - page 25

    INSTALLING THE SEH SEH USER’S GUIDE 3-5 3.2.4 Rack Mounting the SEH Refer to Figure 3-4 and perform these steps to install the SEH in a 19-inch rack. 1. Locate the four 8-32 x 1/4" screws and the two rackmount brackets in the accessory kit (see Figure 3-2). 2. Using the four 8-32 x 1/4" screws provided in the accessory kit, attach the r ...

  • Cabletron Systems SEH-22 - page 26

    CHAPTER 3: INSTALLATION 3-6 SEH USER’S GUIDE Figure 3-5. Installing the SEH in the Rack If the installation requires that the SEH is to be stacked, proceed to Section 3.2.5. Otherwise, continue by connecting po wer as described in Section 3.3. 3.2.5 Stacking the SEH The rear panel of the SEH has an SEH Interconnect Bus In Port (female connector) ...

  • Cabletron Systems SEH-22 - page 27

    INSTALLING THE SEH SEH USER’S GUIDE 3-7 T o stack SEHs, refer to Figure 3-6 and perform the following steps: 1. Attach one end of the SEH HubSTACK Interconnect cable to the bus port labeled “OUT” on the rear panel of the SEH. 2. Attach the other end of the SEH HubSTACK Interconnect cable to the bus port labeled “IN” on the rear panel of t ...

  • Cabletron Systems SEH-22 - page 28

    CHAPTER 3: INSTALLATION 3-8 SEH USER’S GUIDE If one end of a HubST A CK Interconnect cable is disconnected without disconnecting the other end attached to the hub, ensure that you disconnect the cable from the “OUT” port as sho wn in Figure 3-7. This ensures that the HubST A CK Interconnect cable is terminated properly . Figure 3-7. Disconnec ...

  • Cabletron Systems SEH-22 - page 29

    CONNECTING THE SEH TO THE POWER SOURCE SEH USER’S GUIDE 3-9 3.3 CONNECTING THE SEH TO THE POWER SOURCE Connect the SEH to the po wer source as follows: 1. Plug the power cord into the back panel of the SEH. 2. Plug the other end of the power cord into a grounded wall outlet. 3. Verify that the PWR LED is on; this indicates that the SEH is receivi ...

  • Cabletron Systems SEH-22 - page 30

    CHAPTER 3: INSTALLATION 3-10 SEH USER’S GUIDE 2. Slide the new EPIM into place, making sure that the connectors on the rear of the EPIM align correctly and firmly with the connector inside the SEH. Refer to Figure 3-8. 3. Install the mounting screw. Figure 3-8. Installing an EPIM 1490_12 LNK EPIM-T EPIM-1 EPIM-2 SEH Book Page 10 Tuesday, March 19 ...

  • Cabletron Systems SEH-22 - page 31

    SEH USER’S GUIDE 4-1 CHAPTER 4 CONNECTING T O THE NETWORK This chapter outlines the procedure for connecting the SEH to a network. Ensure that the network meets the guidelines and requirements outlined in Chapter 2, Installation Requirements/Specifications , before installing the SEH. 4.1 CONNECTING THE SEH TO THE NETWORK The procedure for conne ...

  • Cabletron Systems SEH-22 - page 32

    CHAPTER 4: CONNECTING TO THE NETWORK 4-2 SEH USER’S GUIDE Connect twisted pair segments to the SEH as follo ws: 1. Insert the RJ45 connector from each twisted pair segment into the desired network port on the SEH. See Figure 4-1. Figure 4-1. SEH-24 Network Ports 2. Check that the applicable LNK LED for the port is on. If the LED is off, perform e ...

  • Cabletron Systems SEH-22 - page 33

    CONNECTING THE SEH TO THE NETWORK SEH USER’S GUIDE 4-3 4.1.2 Connecting a UTP Segment to an EPIM-T Before connecting a segment to the EPIM-T , check each end of the segment to determine if the wires are crossed o ver for the proper connection. If the wires do not cross ov er , use the switch on the EPIM-T to internally cross ov er the RJ45 port. ...

  • Cabletron Systems SEH-22 - page 34

    CHAPTER 4: CONNECTING TO THE NETWORK 4-4 SEH USER’S GUIDE c. Check the cable for continuity. d. Check that the twisted pair connection meets dB loss and cable specifications outlined in Chapter 2. e. Check that the crossover switch is in the correct position. If a link is not established, contact Cabletron Systems T echnical Support. 4.1.3 Connec ...

  • Cabletron Systems SEH-22 - page 35

    CONNECTING THE SEH TO THE NETWORK SEH USER’S GUIDE 4-5 Caution : Do not touch the ends of the fiber optic strands, and do not let the ends come in contact with dust, dirt, or other contaminants. Contamination of the ends causes problems in data transmissions. If the ends become contaminated, clean them with alcohol using a soft, clean, lint free ...

  • Cabletron Systems SEH-22 - page 36

    CHAPTER 4: CONNECTING TO THE NETWORK 4-6 SEH USER’S GUIDE Figure 4-3. The EPIM-F1, EPIM-F2 and EPIM-F3 4.1.4 Connecting a Thin-Net Segment to an EPIM-C T o connect a thin-net segment to an EPIM-C, refer to Figure 4-4 and perform the follo wing steps: 1. Set the Internal Termination Switch labeled TERM to: • The ON position ( • ) if the thin-n ...

  • Cabletron Systems SEH-22 - page 37

    CONNECTING THE SEH TO THE NETWORK SEH USER’S GUIDE 4-7 3. If the Internal Termination switch is in the OFF position: a. Attach a BNC tee-connector to the BNC port on the module. b. Attach the thin-net segment to one of the female connectors on the tee-connector. c. Attach another thin-coax segment or a terminator to the other female connector on ...

  • Cabletron Systems SEH-22 - page 38

    CHAPTER 4: CONNECTING TO THE NETWORK 4-8 SEH USER’S GUIDE 4.1.5 Connecting an A UI Cab le to an EPIM-A Connect an EPIM-A to an external netw ork segment as follo ws: 1. Attach an external transceiver to the network segment that will be connected to the AUI port. Refer to the applicable transceiver manual. 2. Attach an AUI cable, no longer than 50 ...

  • Cabletron Systems SEH-22 - page 39

    CONNECTING THE SEH TO THE NETWORK SEH USER’S GUIDE 4-9 5. Check that the PWR LED on the EPIM-A is on. If the LED is off, contact Cabletron Systems Technical Support. 6. If the PWR LED is on with the AUI cable disconnected, continue with the following checks: a. Check the A UI connections for proper pinouts. The pinouts for the transcei ver connec ...

  • Cabletron Systems SEH-22 - page 40

    CHAPTER 4: CONNECTING TO THE NETWORK 4-10 SEH USER’S GUIDE 2. Attach one end of an AUI cable, no longer than 50 meters in length, to the port on the EPIM-X (Figure 4-6) and the other end to the intended node. Figure 4-6. The EPIM-X 4.2 FINISHING THE INSTALLATION The SEH is no w ready for operation. Before placing the network into service, test th ...

  • Cabletron Systems SEH-22 - page 41

    SEH USER’S GUIDE 5-1 CHAPTER 5 TROUBLESHOO TING This chapter contains instructions for using LANVIEW LEDs to troubleshoot physical layer network problems. 5.1 INSTALLATION CHECK-OUT After connecting the SEH to the network, v erify that packets pass between all Ethernet de vices connected to the SEH and an y other de vices connected to the network ...

  • Cabletron Systems SEH-22 - page 42

    CHAPTER 5: TROUBLESHOOTING 5-2 SEH USER’S GUIDE 2. If the remote station is ready and the LNK LED is on, but no data passes through the port, one of two conditions may exist: • Network management has disabled the port. • The port is segmented either because the collision detector w as on for more than 110 µ s or the SEH detected more than 32 ...

  • Cabletron Systems SEH-22 - page 43

    USING LANVIEW SEH USER’S GUIDE 5-3 Figure 5-1. LANVIEW LEDs PWR (Green) When this LED is on, the SEH is recei ving power . If this LED is of f, it indicates a loss of input po wer . Check the po wer source (circuit breaker , fuse, etc.). If the proper source po wer is present, the problem could be with the SEH. LED Name PWR (Power) MGMT (Manageme ...

  • Cabletron Systems SEH-22 - page 44

    CHAPTER 5: TROUBLESHOOTING 5-4 SEH USER’S GUIDE MGMT (Green Flashing) This LED flashes when an intelligent hub manages the SEH. If this LED does not flash, an intelligent hub is not managing the SEH. If an intelligent hub is connected to the SEH and the LED does not flash, inspect the HubST A CK Interconnect cables for proper connections. CLN ...

  • Cabletron Systems SEH-22 - page 45

    SEH USER’S GUIDE A-1 APPENDIX A EPIM INFORMA TION A.1 EPIM SPECIFICATIONS EPIMs enable the connection of the SEH to the main network using dif ferent media types. Cabletron Systems offers a v ariety of EPIMs. The follo wing sections explain specifications for each EPIM. A.1.1 EPIM-T The EPIM-T is an RJ45 connector supporting UTP cabling. It has ...

  • Cabletron Systems SEH-22 - page 46

    APPENDIX A: EPIM INFORMATION A-2 SEH USER’S GUIDE A.1.2 EPIM-F1 and EPIM-F2 The EPIM-F1 and EPIM-F2 sho wn in Figure A-2 support Multimode Fiber Optic cabling. Each EPIM has an internal Cabletron Systems FOT-F Fiber Optic Transceiver . The EPIM-F1 is equipped with SMA Connectors and the EPIM-F2 is equipped with ST Connectors. Specifications for ...

  • Cabletron Systems SEH-22 - page 47

    EPIM SPECIFICATIONS SEH USER’S GUIDE A-3 A.1.3 EPIM-F3 The EPIM-F3 sho wn in Figure A-3 supports Single Mode Fiber Optic cabling. It has an internal Cabletron Systems FOT-F Fiber Optic Transceiver and is equipped with ST Connectors. Specif ications for the EPIM-F3 are listed on the follo wing page. Figure A-3. EPIM-F3 Note : Transmitter Power dec ...

  • Cabletron Systems SEH-22 - page 48

    APPENDIX A: EPIM INFORMATION A-4 SEH USER’S GUIDE Note : The transmitter power levels given above are Peak Power Levels after optical overshoot. You must use a Peak Power Meter to correctly compare the values given above to those measured on any particular port. If you are measuring power levels with an Average Power Meter, add 3 dBm to the avera ...

  • Cabletron Systems SEH-22 - page 49

    EPIM SPECIFICATIONS SEH USER’S GUIDE A-5 A.1.4 EPIM-C The EPIM-C supports thin-net coaxial cabling and is equipped with an internal Cabletron Systems TMS-3 Transceiver . Use the TERM switch on the front of the EPIM-C to set the internal 50 ohm terminator . This eliminates the need to connect the port to a tee-connector and terminator . Figure A-4 ...

  • Cabletron Systems SEH-22 - page 50

    APPENDIX A: EPIM INFORMATION A-6 SEH USER’S GUIDE A.1.5 EPIM-A and EPIM-X (A UI P or t) The EPIM-A is a DB15 female connector used to attach segments to an external transcei ver . The EPIM-X is equipped with dual internal transcei vers. It has a DB15 male connector used to attach segments to an A UI cable. Figure A-5 sho ws both modules. Figure A ...

  • Cabletron Systems SEH-22 - page 51

    EPIM CABLE SPECIFICATIONS SEH USER’S GUIDE A-7 A.2 EPIM CABLE SPECIFICATIONS The follo wing subsections provide cable specifications for the v arious EPIMs use in the SEH. A.2.1 Multimode Fiber Optic Cable Specifications T able A-1 sho ws Multimode Fiber Optic Cable specifications for the EPIM-F1 and EPIM-F2 modules. Attenuation T est the fib ...

  • Cabletron Systems SEH-22 - page 52

    APPENDIX A: EPIM INFORMATION A-8 SEH USER’S GUIDE A.2.2 Single Mode Fiber Optic Cable Specifications T able A-2 sho ws Single Mode Fiber Optic Cable specifications for the EPIM-F3. Attenuation T est the fiber optic cable with a fiber optic attenuation test set adjusted for an 1300 nm wa velength. This test verifies that the signal loss in a ...

  • Cabletron Systems SEH-22 - page 53

    EPIM CABLE SPECIFICATIONS SEH USER’S GUIDE A-9 A.2.3 Thin-Net Network Requirements f or the EPIM-C When you connect a thin-net segment to the SEH (via an EPIM-C), your network must meet the follo wing requirements: Cable Type Use 50 ohm RG-58A/U coaxial cable to make up a thin-net se gment. Length The thin-net segment must be no longer than 185 m ...

  • Cabletron Systems SEH-22 - page 54

    APPENDIX A: EPIM INFORMATION A-10 SEH USER’S GUIDE A.2.4 A UI Cab le Requirements for the EPIM-A and EPIM-X T o connect an external network segment to the SEH (via an EPIM-A or EPIM-X), the A UI cable must meet the follo wing requirements: AUI Cable The cable between the module and de vice must be IEEE 802.3 type cable. Length The A UI Cable must ...

  • Cabletron Systems SEH-22 - page 55

    SEH USER’S GUIDE Index-1 C Cable Specifications 2-1 UTP and STP 2-2 Connecting to the Network 4-1 D Daughter Board 1-6 Daughter Board Upgrade Kit 1-6 E EMC Requirements 2-7 EMI Requirements 2-7 EPIM Installation 3-9 EPIM-A A-6 EPIM-C A-5 EPIM-F1 A-2 EPIM-F2 A-2 EPIM-F3 A-3 EPIMs 1-4 EPIM-T A-1 EPIM-X A-6 H HubSTACK Interconnect Cables 1-6 I Insta ...

  • Cabletron Systems SEH-22 - page 56

    POWER SUPPLY CORD The mains cord used with this equipment must be a 2 conductor plus ground type with minimum 0.75 mm square conductors and must incorporate a standard IEC appliance coupler on one end and a mains plug on the other end which is suitable for the use and application of the product and that is approved for use in the country of applica ...

Manufacturer Cabletron Systems Category Switch

Documents that we receive from a manufacturer of a Cabletron Systems SEH-22 can be divided into several groups. They are, among others:
- Cabletron Systems technical drawings
- SEH-22 manuals
- Cabletron Systems product data sheets
- information booklets
- or energy labels Cabletron Systems SEH-22
All of them are important, but the most important information from the point of view of use of the device are in the user manual Cabletron Systems SEH-22.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Cabletron Systems SEH-22, service manual, brief instructions and user manuals Cabletron Systems SEH-22. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product Cabletron Systems SEH-22.

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A complete manual for the device Cabletron Systems SEH-22, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Cabletron Systems SEH-22 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Cabletron Systems SEH-22.

A complete Cabletron Systems manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual Cabletron Systems SEH-22 - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the Cabletron Systems SEH-22, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the Cabletron Systems SEH-22, that we can find in the current document
3. Tips how to use the basic functions of the device Cabletron Systems SEH-22 - which should help us in our first steps of using Cabletron Systems SEH-22
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Cabletron Systems SEH-22
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of Cabletron Systems SEH-22 in a specific country, if it was not possible to solve the problem on our own.

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