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Manual Polycom EF2241

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  • Polycom EF2241 - page 1

    V ortex EF2241 Reference Manual ...

  • Polycom EF2241 - page 2

    ...

  • Polycom EF2241 - page 3

    V ORTEX EF2241 R EFERENCE M ANUAL Polycom, Inc., Copyright 2 002 1 Technical Support: 800.932.2774 Introduction ....................................................................................................2 Product Features .............. .............. .............. .............. .............. .............. .............. .. 3 Pre-Insta ...

  • Polycom EF2241 - page 4

    I NTRODUCTION V ORTEX EF2241 Reference Manual 2 Technical Support: 800.932.2774 I NTRODUCTION Welcome Congratulations on your pu rchase of the V ortex EF2241! How to Use This Manual This is a reference manual for your EF2241. It is stru ctured to provide the informa- tion you need quickly and conveniently . Th e following is an overview of each sec ...

  • Polycom EF2241 - page 5

    I NTRODUCTION © Polycom, Inc. 3 V ORTEX EF2241 Reference Manual busses equals 12 inputs), and 2 mixes of the P Bus for the telephone. The 23 x 17 main matrix has the following outp uts: Outputs 1-4 and A-D, AEC Reference 1 and 2, W , X, Y , and Z outputs to the digital expansion bus, P output to the digital expan sion bus, output to the power ampl ...

  • Polycom EF2241 - page 6

    I NTRODUCTION V ORTEX EF2241 Reference Manual 4 Technical Support: 800.932.2774 Inputs and Outputs • 4 microphone/line level in puts with phantom power on each input • 24 VDC Phantom Power • 4 line level auxiliary inputs with nominal lev el of 0 dBu • 8 line level outputs with default no minal level of 0 dBu • Automatic Gain Control (AGC) ...

  • Polycom EF2241 - page 7

    P RE -I NSTALLATION © Polycom, Inc. 5 V ORTEX EF2241 Reference Manual P RE -I NSTALLATION What’s Included The V ortex EF2241 product packag e includes the following items: • V ortex EF2241 Reference Manual • V ortex EF2241 • External power supply • Cat 5 cable for EF Bus • T elephone cable • Rack mount screws (4) • Phoenix connecto ...

  • Polycom EF2241 - page 8

    P RE -I NSTALLATION V ORTEX EF2241 Reference Manual 6 Technical Support: 800.932.2774 EF2241 F RONT AND R EAR P ANELS 1. LCD D ISPLAY . Display s menu instructions for configuration and operation of th e EF2241. 2. D OWN B UTTON . Scrolls backward through menu items at a particular level or decreases the value of a parameter . 3. U P B UTT ON . Scr ...

  • Polycom EF2241 - page 9

    P RE -I NSTALLATION © Polycom, Inc. 7 V ORTEX EF2241 Reference Manual 10. I NPUT P ARALLEL P ORT . Parallel logic input. 11 . O UTPUT P ARALLEL P ORT . Parallel logic output. 12. EF B US I N . Connects to EF B US O UT of another V ortex device. 13. EF B US O UT . Connects to the EF B US I N of another V ortex device. 14. RS-232 S ERIAL P ORT . Con ...

  • Polycom EF2241 - page 10

    I NSTALLATION V ORTEX EF2241 Reference Manual 8 Technical Support: 800.932.2774 I NSTALLATION This equipment is intended to only be inst alled by qu alified service personnel. The equipment shall be connected to a socket-o utlet that provides a protective earthing connection. North American Requirement CAUTION-T o reduce the risk of fire, use only ...

  • Polycom EF2241 - page 11

    I NSTALLATION © Polycom, Inc. 9 V ORTEX EF2241 Reference Manual Typical EF2241 Connections The EF2241 will typically be connected to other equipm ent in a single room setup as shown below in Fig ure 5 and Figure 6. The following steps are typically used to set up the EF2241: • Connect a microphone to each of the 4 mi c/line level inputs. The mic ...

  • Polycom EF2241 - page 12

    I NSTALLATION V ORTEX EF2241 Reference Manual 10 Technical Support: 800.932.2774 • Connect speaker output to loudspeaker . • If RS-232 remote control is desired, connect the RS-232 R EMOTE C ONTROL port of the EF2241 to the remote control de vice, such as an RS-232 interface to a touch panel or a CO M port on a personal computer . • Connect t ...

  • Polycom EF2241 - page 13

    I NSTALLATION © Polycom, Inc. 11 V ORTEX EF2241 Reference Manual Terminating the EF2241 The EF2241 is self-terminating so if y ou are connecting mu ltiple EF2241s, the EF Bus does NOT need to be terminated. However , if you are linking the EF2241 to EF2280s, terminate the EF Bus link. F ACTORY D EFAULT S ETTINGS (P RESET 0) The following is a list ...

  • Polycom EF2241 - page 14

    I NSTALLATION V ORTEX EF2241 Reference Manual 12 Technical Support: 800.932.2774 whichever preset you want to come up afte r power up). The unit will need to be con- figured for your syst em. P ROGRAM P ARAMETERS F ACTORY D EFAULT P RESET V ALUE S YSTEM P ARAMETERS Preset 0 Device ID 0 A UTOMIX P ARAMETERS Chairman Mode Off Decay Time 1000 ms Hold ...

  • Polycom EF2241 - page 15

    I NSTALLATION © Polycom, Inc. 13 V ORTEX EF2241 Reference Manual Presets and Multiple Vortex Devices P RESET 0 is preconfigured for a system with multiple V ortex devices. In Preset 0, microphones are bussed out to oth er units on the W Bus. Microphones are also input into each device on the W Bus (I NPUT WM0 in the Matrix) . If you have multiple ...

  • Polycom EF2241 - page 16

    I NSTALLATION V ORTEX EF2241 Reference Manual 14 Technical Support: 800.932.2774 Configure the matrix mixer input from the codec output. The input gain of the matrix mixer shou ld be set to match the n ominal output level of the codec. For example, if the codec outputs a -10 dBV (-8 dBu) level, 8 dB of gain should be applied on the matrix mixer inp ...

  • Polycom EF2241 - page 17

    I NTEGRATING THE EF2241 I NTO Y OUR S YSTEM © Polycom, Inc. 15 V ORTEX EF2241 Reference Manual I NTEGRATING THE EF2241 I NTO Y OUR S YSTEM Operating the EF2241 The EF2241 can be operated in two ways: th rough the LCD menu on the front panel or through RS-232. For control via RS-2 32, please refer to the EF2241 Programming Guide, which includes pro ...

  • Polycom EF2241 - page 18

    I NTEGRATING THE EF2241 I NTO Y OUR S YSTEM V ORTEX EF2241 Reference Manual 16 Technical Support: 800.932.2774 you should increase your in put gain by 15 dB. If th e meter shows an average gain of +10 dB, you should decrease your input gain by 10 dB. Set Levels on Line Input Channels Set the line input channel gains (Channels A-D) to match the nomi ...

  • Polycom EF2241 - page 19

    I NTEGRATING THE EF2241 I NTO Y OUR S YSTEM © Polycom, Inc. 17 V ORTEX EF2241 Reference Manual Customize Setting for Your Particular Application The following sections will describe custo mizing parameters on the EF2241 for your particular application if you are not using Preset 0. S ET UP THE P HONE I NTERF ACE The echo canceller reference of the ...

  • Polycom EF2241 - page 20

    I NTEGRATING THE EF2241 I NTO Y OUR S YSTEM V ORTEX EF2241 Reference Manual 18 Technical Support: 800.932.2774 for their echo canceller , or they can us e their own internal references. The references may include a m ix of any input, with crossp oint gains, includin g W , X, Y , and Z bus- ses. Set the EF Bus Reference in the System Menu of the LCD ...

  • Polycom EF2241 - page 21

    I NTEGRATING THE EF2241 I NTO Y OUR S YSTEM © Polycom, Inc. 19 V ORTEX EF2241 Reference Manual If far end audio and program audi o sources are on several V ortex devices. 1. Bus each far end audio and program audi o source to each device. Do this by assigning each signal input to either the W , X, Y or Z bus. 2. Assign an echo canceller reference ...

  • Polycom EF2241 - page 22

    I NTEGRATING THE EF2241 I NTO Y OUR S YSTEM V ORTEX EF2241 Reference Manual 20 Technical Support: 800.932.2774 Local Max NOM, Global Max NOM, Off Attenuation, Threshold T ype, Gating Mode, Adaptive Thresh old, Manual Threshold, an d Gate Priority . Global Settings. Decay T ime. Decay time is the amount of time the microphone audio takes to ramp dow ...

  • Polycom EF2241 - page 23

    I NTEGRATING THE EF2241 I NTO Y OUR S YSTEM © Polycom, Inc. 21 V ORTEX EF2241 Reference Manual (NOM) limit for each linked automixer . The maxi mum value for this command is 64. This NOM limit is a “global” limit, meanin g that this limit applies to all linked automixers with the same Bus ID. Off Attenu ation. Sets the Off Attenuation (in dB) ...

  • Polycom EF2241 - page 24

    I NTEGRATING THE EF2241 I NTO Y OUR S YSTEM V ORTEX EF2241 Reference Manual 22 Technical Support: 800.932.2774 Automixer and Bus Mixer Settings T o operate the V ortex device in any of the above possibilites, two global parameters need to be changed: the A UTOMI XER and the B US M IXER (see Figure 14). The A UTO - MIXER parameter chooses which auto ...

  • Polycom EF2241 - page 25

    I NTEGRATING THE EF2241 I NTO Y OUR S YSTEM © Polycom, Inc. 23 V ORTEX EF2241 Reference Manual 1. Assign Inputs Assign each audio source to an input. Re member to include the conferencing equip- ment such as a video codec and any program audio. 2. Assign Outputs T ry to assign as many outputs as you can to one V ortex device to make a simpler sub- ...

  • Polycom EF2241 - page 26

    T HE EF B US V ORTEX EF2241 Reference Manual 24 Technical Support: 800.932.2774 T HE EF B US The EF Bus is a high speed, low delay digita l bus that includes the W , X, Y , and Z audio busses, the P bus, as well as the ech o canceller bus reference and remote control information (for other EF devi ces). It can link up to 8 V ortex devices. The W , ...

  • Polycom EF2241 - page 27

    T HE EF B US © Polycom, Inc. 25 V ORTEX EF2241 Reference Manual EF Bus Reference. In a system w ith multiple de vices, if all devices need the same echo canceller reference, one device should be designated to put its echo cancel- ler reference (either Ref 1 or Ref 2) on the EF bus to be used as the EF Bus Reference. All other devi ces may use the ...

  • Polycom EF2241 - page 28

    LCD M ENU S TRUCT URE V ORTEX EF2241 Reference Manual 26 Technical Support: 800.932.2774 LCD M ENU S TRUCTURE LCD Menu Tree The EF2241 LCD menu structure is made up of nine menu trees: S YSTEM , P HONE C ONTROL , I NPUTS , O UTPU TS , A UTOMIXER , M ATRIX , P ARAM ETRIC EQ, P RESETS , and M ACROS . Each menu tree is organized by leve ls and branche ...

  • Polycom EF2241 - page 29

    LCD M ENU S TRUCT URE © Polycom, Inc. 27 V ORTEX EF2241 Reference Manual must be flashing. T o make the parameter flash (assuming the front panel is not locked) press E NTER . Once the parameter is flashing, use the U P and D OWN buttons to adjust the parameter value. The parameter is instantly updated while it is being adjusted — you should hea ...

  • Polycom EF2241 - page 30

    LCD M ENU S TRUCT URE V ORTEX EF2241 Reference Manual 28 Technical Support: 800.932.2774 S YSTEM M ENU The S YSTEM menu co ntains P OWER O N P RESET , A CKNOWLED GEMENT M ODE , B US R EFERENCE , E RROR M ESSAGES , F RONT P ANEL L OCK , F RONT P ANE L P ASSWORD , D EVICE ID, B AUD R ATE , F LOW C ONTROL , LCD C ONTR AST , M ETER , N ON -V OLATILE M ...

  • Polycom EF2241 - page 31

    LCD M ENU S TRUCT URE © Polycom, Inc. 29 V ORTEX EF2241 Reference Manual P HONE C ONTROL Auto Answer . Enables or disables auto answer . Auto Hangup Call Progress. Enables or disables auto hangup based on call progress messages. Auto Hangup Loop Drop. Enables or disables auto hangup cased on loop drop. Country Select. Selects the country where you ...

  • Polycom EF2241 - page 32

    LCD M ENU S TRUCT URE V ORTEX EF2241 Reference Manual 30 Technical Support: 800.932.2774 I NPUTS The input menu allows the user to adjust function s related to the input signals to the EF2241. This menu contains A COUSTIC E CHO C ANCELLA TION , A UTOM ATIC G AIN C ONTROL , AGC M AXIMUM , AGC M INI MUM , G AIN A DJUST , L EVEL M IC /L INE , M UTE , ...

  • Polycom EF2241 - page 33

    LCD M ENU S TRUCT URE © Polycom, Inc. 31 V ORTEX EF2241 Reference Manual Phone Input Gain. This parameter adjusts the gain level of the Phone in put. Phone AGC. Enables or disables automatic gain control on the Phone. O UTPUTS The O UTPUT menu contains G AIN , NOM A CTIVE , and M UTE . As with the I NPUT menus, this is done on a per channel basis. ...

  • Polycom EF2241 - page 34

    LCD M ENU S TRUCT URE V ORTEX EF2241 Reference Manual 32 Technical Support: 800.932.2774 T HRESHOLD , M ANUAL T HRESHOLD , an d G ATE P RIORITY . Global Settings. Decay T ime. Decay time is the amount of time the microphone audio takes to ramp down to the Off Attenuation level after Hold T ime. Decay Ti me values range from 0 to 5000 msec. The defa ...

  • Polycom EF2241 - page 35

    LCD M ENU S TRUCT URE © Polycom, Inc. 33 V ORTEX EF2241 Reference Manual Mixer Settings. Bus Mixer . This command is used to assign one of the two internal automixers to one of the EF Bus automixer groups. For example, cons ider three V ortex devices each of which has 2 microphones assigned to Automixer 1 and 2 micro- phones assigned to Automixer ...

  • Polycom EF2241 - page 36

    LCD M ENU S TRUCT URE V ORTEX EF2241 Reference Manual 34 Technical Support: 800.932.2774 Gate Priority . The priority of each microphone can be assigned a value ranging from 1 to 4. Priority 1 microphon es have priority over priority 4 microphones for gating. The default i s to have all micr ophones set to priority 1. If Chairman Mode is enabled, a ...

  • Polycom EF2241 - page 37

    LCD M ENU S TRUCT URE © Polycom, Inc. 35 V ORTEX EF2241 Reference Manual P AR AMETRIC EQ M ENU The input equalizer is comprised of up to 5 bands of filtering . The whole group of fil- ters for the channel can also be enabled/disabled without losing the settings for each band. For each band, you first select the type of filter from the following: P ...

  • Polycom EF2241 - page 38

    LCD M ENU S TRUCT URE V ORTEX EF2241 Reference Manual 36 Technical Support: 800.932.2774 P RESETS Restore. Restores the selected preset. Save. Saves the selected user preset (Presets 16-47). Factory pr eset s (Preset 0-15) cannot be overwritten. Delete. Deletes the selected user preset (Prese ts 16-47). Factory Presets (Presets 0- 15) cannot be del ...

  • Polycom EF2241 - page 39

    T ROUBLES HOOTING © Polycom, Inc. 37 V ORTEX EF2241 Reference Manual T ROUBLESHOOTING A UTOMATIC M ICROPHONE M IX ER No microphones are gating • Check if the micr ophones are muted. • Are microphones part of one of the 2 automixers? Some microphones are not gating • Check if the microphones ar e assigned to an automixer . • Check if the mi ...

  • Polycom EF2241 - page 40

    T ROUBLES HOOTING V ORTEX EF2241 Reference Manual 38 Technical Support: 800.932.2774 M ATRIX M IXER Don’t hear output • Make sure the output is not muted. • Check that the input you’re exp ecting to hear is included in the output th at you’re listening t o. E CHO C ANCELLER R EFER ENCE Room Audio Sounds Choppy If you hear the local room? ...

  • Polycom EF2241 - page 41

    T ROUBLES HOOTING © Polycom, Inc. 39 V ORTEX EF2241 Reference Manual Reverberation is not an artifact of the echo can celler . It is mainly affected by the dis- tance of the microphone from the speech source and by the resonances of the room. While reverberation can be unpleasant, it is not compensated for by the acoustic echo canceller (AEC), whi ...

  • Polycom EF2241 - page 42

    T ROUBLES HOOTING V ORTEX EF2241 Reference Manual 40 Technical Support: 800.932.2774 and the level of this signal that is reflected as the microph one input (after microphone amplification). If the electrical level of the reflected signal picked up by microphone is the same as the level of the electrical signal sent fr om the AEC to the loudspeaker ...

  • Polycom EF2241 - page 43

    T ROUBLES HOOTING © Polycom, Inc. 41 V ORTEX EF2241 Reference Manual talker to the microphone. The m icrophone audio will most li kely also be muddy and reverberant. The installer or user may try to solve these microphone audio quality problems by turning up the microphone amplification, thus adding to the room gain. This problem can be remedied b ...

  • Polycom EF2241 - page 44

    T ROUBLES HOOTING V ORTEX EF2241 Reference Manual 42 Technical Support: 800.932.2774 Nonlinear distortion causes a degradation or divergence of the AEC’ s internal model of the room acoustics. In this situatio n, the EF2241 cannot ef fectively cancel room echoes and a substantial amount of echo may be heard by the remote part y . Excessive microp ...

  • Polycom EF2241 - page 45

    T ROUBLES HOOTING © Polycom, Inc. 43 V ORTEX EF2241 Reference Manual If you suspect the loudspeaker is introducing nonlinearities int o the room acoustic path, take t hese steps to mini mi ze its influence on the echo canceller . • Keep the loudspeaker ’ s volume level at less than three-eighths of full scale. If higher volume is required, the ...

  • Polycom EF2241 - page 46

    T ECHNICAL S PECIFICATIONS V ORTEX EF2241 Reference Manual 44 Technical Support: 800.932.2774 T ECHNICAL S PECIFICATIONS M ECHANICAL S PECIFICATIONS Dimensions 19” (483 mm) W x 9 .6” (244 mm) L x 1.75” (45 mm) H (full rack unit) W e ight 4 lb. (1.8 kg) dry 5.5 lb. (2.5 kg) shipping Connectors Audio: Mini (3.5mm ) quick connect terminal blocks ...

  • Polycom EF2241 - page 47

    T ECHNICAL S PECIFICATIONS © Polycom, Inc. 45 V ORTEX EF2241 Reference Manual C OMPLIANCE The V ortex EF2241 complies with the ITU G .167 Recommendation for AEC, FCC part 15, and CE requirements. USA and Canada This device complies with part 15 of th e FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause ha ...

  • Polycom EF2241 - page 48

    T ECHNICAL S PECIFICATIONS V ORTEX EF2241 Reference Manual 46 Technical Support: 800.932.2774 • If, in the unlikely event that this equipment causes harm to the network, the tele- phone company will notify you in advance tha t temporary discontinuance of ser- vice may be r equir ed. But if advance notice isn't practical, the telephone compan ...

  • Polycom EF2241 - page 49

    T ECHNICAL S PECIFICATIONS © Polycom, Inc. 47 V ORTEX EF2241 Reference Manual NOTICE : The Ringer Equivalence Number (REN) assigned to each relevant termi- nal device provides an indi cation of the maximum nu mber of terminal s allowed to be connected to a telephone interface. The termination on an interface may consist of any combination of devic ...

  • Polycom EF2241 - page 50

    T ECHNICAL S PECIFICATIONS V ORTEX EF2241 Reference Manual 48 Technical Support: 800.932.2774 This page was intentionally left blank. ...

  • Polycom EF2241 - page 51

    © Polycom, Inc. 47 V ORTEX EF2241 Reference Manual CE Mark R& TTE Directive This EF2241 has been marked with the CE mark. This mark indicates compliance with EEC Directives 89/336/EEC, 73/23/EEC 1999/5/EC. A full copy of the Decla- ration of Conformity can be obtained from Polycom Ltd, 270 Bath Road, Sl ough, Berkshire, SL1 4DX, U K. Declarati ...

  • Polycom EF2241 - page 52

    V ORTEX EF2241 Reference Manual 48 Technical Support: 800.932.2774 Polycom Ltd. förklarar härmed att d enna EF2241 överensst ämmer med de väsentliga kraven och övriga relevan ta stadganden i d irektiv 1999/5/EG . ...

  • Polycom EF2241 - page 53

    C ONFERE NCE S YSTEM D ESIGN © Polycom, Inc. 49 V ORTEX EF2241 Reference Manual C ONFERENCE S YSTEM D ESIGN Good audio or video conferencing is more than acoustic echo cancellation. Before installing the EF2241, you should consider how your whole conference system will work together . The goals of confer ence system design are the following: • T ...

  • Polycom EF2241 - page 54

    EF2241 B LOCK D IAGRAM V ORTEX EF2241 Reference Manual 50 Technical Support: 800.932.2774 EF2241 B LOCK D IAGRAM Figure 30. Inside the EF2241 Copyright (c) 2001, Polycom Inc. All Rights Res erved Echo Canceller Noise Canceller R1, R2, Bus A/ D Level adjust Mic/Line 2 +- EN Delay +- A/ D Level adjust Mic/Line 1 +- EN Delay +- A/D Level adjust Mic/Li ...

  • Polycom EF2241 - page 55

    C ONNECTOR P INOUTS © Polycom, Inc. 51 V ORTEX EF2241 Reference Manual C ONNECTOR P INOUTS EF Bus The EF Bus uses RJ45 conn ectors. These should be used with category five twisted-pair cable. The total distance of the EF Bus should be les s than 4.5 m. The EF Bus must be connected so that th e EF Bus In of one box is connected to the EF Bus Out of ...

  • Polycom EF2241 - page 56

    C ONNECTOR P INOUTS V ORTEX EF2241 Reference Manual 52 Technical Support: 800.932.2774 Note The information below lists ma nufactur er information for the Phoeni x connector that is compatible with the parts we use: Manufacturer: Phoenix Contact Description: Mini-COMBICON 3-positio n plug, 3.5 mm pitch T ype Number: MC 1.5/3-ST -3.5 or MC 1,5/3-ST ...

  • Polycom EF2241 - page 57

    C ONNECTOR P INOUTS © Polycom, Inc. 53 V ORTEX EF2241 Reference Manual C ONNECTING U NBALANCED RCA TO B ALANCED M INI P HOENIX 1. Connect RCA T ip to Phoenix pin 1. 2. Connect RCA Ring to Phoenix pin 2. 3. Connect Phoenix pin 3 to Shield, and leave Shield fl oating on RCA end. M AKING AN EF B US T ERMINATOR Instructions T o make a terminator (for ...

  • Polycom EF2241 - page 58

    C ONNECTOR P INOUTS V ORTEX EF2241 Reference Manual 54 Technical Support: 800.932.2774 A DDITIONAL N OTES Caution! Failure to use all four screws to attach the EF2241 to the rack may result in uneven loading and cause a safety h a zard. Caution! Ensure that the power su pply is securely located such that it cannot become dislodged and fall. Such a ...

  • Polycom EF2241 - page 59

    W ARRANTY I NFORMATION © Polycom, Inc. 55 V ORTEX EF2241 Reference Manual W ARRANTY I NFORMATION What is covered Any defect in materials or workmanshi p. For how long T wo years. What we will do If your V ortex EF2241 p roduct is defective and returned within two years of the date of purchase, we will repair or , at our option, replace it at no ch ...

  • Polycom EF2241 - page 60

    W ARRANTY I NFORMATION V ORTEX EF2241 Reference Manual 56 Technical Support: 800.932.2774 What this warranty does not cover This warranty does not cover defects resul ting from accidents, damage while in tran- sit to our servi ce location, alterations, unaut horized repair , failure to fo llow instruc- tions, misuse, fire, flood, lightning, acts of ...

  • Polycom EF2241 - page 61

    D EFINITIO N OF T ERMS © Polycom, Inc. 57 V ORTEX EF2241 Reference Manual D EFINITION OF T ERMS Acoustic Echo Acoustic echo occurs in a conferencing or distance learning system when the remote speech played in the loudspeakers is pick ed up by microphones in the room and is transmitted back to the remote end. This tr ansmitted signal is a delayed ...

  • Polycom EF2241 - page 62

    D EFINITIO N OF T ERMS V ORTEX EF2241 Reference Manual 58 Technical Support: 800.932.2774 EF Bus The EF Bus is a digital bus that includes the W , X, Y , and Z audio busses as well as the echo canceller reference and remote control information. It can be used to link multiple V ortex devices. Equalization Equalization is the process of adjusting fr ...

  • Polycom EF2241 - page 63

    D EFINITIO N OF T ERMS © Polycom, Inc. 59 V ORTEX EF2241 Reference Manual room gain of this microphone channel is said to be 0 dB. If the reflected signal picked up by the microphone is higher than the level of the signal sent to the line outp ut to your amplifier , that microphone chan nel has positive room gain. The more positive the room gain, ...

  • Polycom EF2241 - page 64

    I NDEX V ORTEX EF2241 Reference Manual 60 Technical Support: 800.932.2774 I NDEX A Acoustic Echo Cancellation, AEC ........................................................ 2, 12, 17, 30, 38, 40, .................................................................................................................44, 49, 57 Automatic Gain Control (AGC) .. ...

  • Polycom EF2241 - page 65

    I NDEX © Polycom, Inc. 61 V ORTEX EF2241 Reference Manual F Factory Default Settings, Preset 0 .....................................................11, 13, 15, 22 Front Panel Lock ...................................................................................28 G Ground .......................................................................... ...

  • Polycom EF2241 - page 66

    I NDEX V ORTEX EF2241 Reference Manual 62 Technical Support: 800.932.2774 .................................................................................................................58 Power Amplifier ..................................................................................... 2, 3, 7, 44 Power On Preset .............................. ...

  • Polycom EF2241 - page 67

    ...

  • Polycom EF2241 - page 68

    Po lycom, Inc. Installed V oice Business Group 1720 Pe achtree Street NW , Suite 220 Atlanta, GA 30309-2439 Phone: (800) 932-2774, (404) 892-3200 F ax: (404) 892-2512 www .polycom.com T echnical Support: (800) 932-2774 vor tex @p ol yco m.c om Pol y c om ® , Vortex ® , and the Poly com logo are re gistered trademarks of Polycom, Inc. in the Unite ...

Manufacturer Polycom Category Mixer

Documents that we receive from a manufacturer of a Polycom EF2241 can be divided into several groups. They are, among others:
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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 Polycom EF2241.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Polycom EF2241, service manual, brief instructions and user manuals Polycom EF2241. 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 Polycom EF2241.

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A complete manual for the device Polycom EF2241, 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 Polycom EF2241 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Polycom EF2241.

A complete Polycom 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.

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2. Contents - index of all tips concerning the Polycom EF2241, that we can find in the current document
3. Tips how to use the basic functions of the device Polycom EF2241 - which should help us in our first steps of using Polycom EF2241
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Polycom EF2241
5. FAQ - Frequently Asked Questions
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