Manuel d'utilisation / d'entretien du produit MMV1600 du fabricant Multi-Tech Systems
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MultiMux MMV1600/3200 Series Dat a/V oice/Fax Priority S t atistical Multiplexer Owner's Manual.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial installation.
Owners Manual 82020109 Revision J MultiMux (#MMV1600C) (#MMV3200C) This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-Tech Systems, Inc. All rights reserved. Copyright © 1997, by Multi-Tech Systems, Inc.
T able of Content s Chapter 1 - Introduction and Description 1.1 Introduction .......................................................................................... 1-1 1.2 About This Manual ........................................................
Chapter 5 - Commands 5.1 Introduction .......................................................................................... 5-1 5.2 Command Description ......................................................................... 5-5 5.2.1 General Commands .
T ables 3-1 LED Indicators ..................................................................................... 3-2 4-1 Cabling Procedure ............................................................................... 4-1 4-2 V.35 Interface .........
1.1 Introduction Congratulations! Your new MultiMux MMV1600/3200 series is one of the finest statistical multiplexers on the market today. The MMV1600/3200 series high speed Priority Statistical Multi.
Chapter 8- Service, Warranty and Tech Support Chapter 8 provides instructions on getting service for the MultiMux at the factory, a statement of the limited warranty, information about our user bulletin board service, and space for recording information about your multiplexer prior to calling Multi-Tech's Technical Support.
1.3 Background Any data communications environment that has more than one asynchronous line going between common locations can probably benefit by installing a pair of statistical multiplexers (stat muxes).
channels, there is considerable flexibility in the choice of the composite channel protocol and speed. The use of a synchronous protocol like HDLC provides for error detection and retransmission over the composite link. Thus, asynchronous terminals, which have no inherent error-recovery capability, can enjoy end-to-end data integrity.
received by the local telephone or fax machine. The voice/fax board has two identical voice/fax channels. Each channel can connect to a private branch exchange (PBX, a small telephone switch), a telephone or fax machine. Each channel has three connectors labeled E&M, FXO and FXS.
When the voice/fax board is used, connections can be made for either channel 1 or channel 2 or both channels and the types of connections are the same for both channels. If a PBX is being used at both the local and remote locations and an E&M trunk connection is desired, then the E&M connections are used for the desired channels.
1.5 System Features 1.5.1 Voice/Fax With the addition of the voice/fax board into the MultiMux, you now can have voice and fax traffic along with your normal data communications on the same composite link.
DA T A DAT A CHANNEL DEVICE INITIA TED P ACING Channel Device Channel Device Mux Mux MUX INITIA TED FLOW CONTROL Pacing stops the output of data from the mux Flow control stops the input of data to the mux 1.5.7 Channel Switching A feature of the MultiMux MMV1600/MMV3200 series is its ability to switch channels between mux units.
port is also connected to a printer, the reports can provide an easy means of generating data for better network management. 1.5.13 Dynamic Buffering A basic requirement of all muxes is some sort of buffering capability to temporarily hold channel data while it is being assembled into a block.
1.6 FCC Regulations for Telephone 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).
1.8 Specifications 1.8.1 Async Data Channels Number of Channels Up to sixteen (#MMV16XXC), or up to thirty-two (#MMV32XXC) Maximum Speed 19,200 bps All Channels Channel Speeds All standard speeds from 300 bps to 19.2K bps Data Format Asynchronous: 5, 6, 7, or 8 data bits, with 1,1.
1.8.6 Voice Channels Number of Channels Two independent channels Voice Digitization Rates 9600 and 16K bps Automatic Fax Group 3 Fax Rates Modulation/ (2400, 4800, 7200 and 9600) Demodulation Interfaces E&M 2 and 4 wire, FXS, FXO Signaling DTMF Line Interface RJ48 Jack for E&M and RJ11 Jacks for FXS and FXO 1.
2.1 Introduction The MultiMux MMV1600/MMV3200 Series is available in two models, a sixteen and thirty-two channel unit with an internal command modem, optional composite link DSUs and two optional voice/fax channels, dial-up capability from a remote location into the command modem and a command port for local AT command configuration information.
2.2 Configuration 1 Configuration 1 is a data-only configuration. This configuration has two Multi-Tech MultiMux MMV1616C/56 which are sixteen channel multiplexers with internal 56K bps composite link DSUs linking sites one and two over a Digital Data Service (DDS) network provided by your telco facility.
Configuration 1 Local Site Channel Parameters Local Channel Parameters/ Node #02 STP FLOW ENQ/ PASS PASS DEST DEST LINK CHN SPD WD BIT PAR CTRL ACK ECHO PACE EIA XON CHN NODE A/B 01 19200 8 1 NONE XO .
2.3 Configuration 2 Configuration 2 is two MultiMux MMV1616C sixteen channel multiplexers with two external Multi-Tech 56K bps Digital Service Units (DSUs) linking the two sites over a Digital Data Service (DDS) network. The RS232C interface on The DSUs is connected to COMPOSITE LINK A EXTERNAL MODEM/DSU connector on the back panel of the MMV1616C.
2.4 Configuration 3 Configuration 3 (Figure 2-3) is the networking configuration with one MultiMux MMV1616C and two MMV1608 multiplexers with the multiplexer at remote site 1 (Node 2) utilizing dual composite links. This networking configuration allows the local site (Node 1) with the host minicomputer to communicate with remote sites 1 and 2.
communicating with Node 3. Node 1 is configured with channels one through eight assigned a destination node of 2 and channels nine through sixteen assigned a destination node of 3. Node 2 has channels one through eight set with a destination node of 1 which is the local site.
2.5 Configuration 4 Configuration 4 is the data/voice/fax configuration with two MultiMux MMV1608C/56/V multiplexers with single composite link connecting a minicomputer and the station side of a PBX .
commands. Whether the second voice/fax channel is used depends on whether one or two instruments (telephone or fax machine) are connected. The parameters for the remote site can be displayed using the VL (List the Voice/Fax Channel Parameters) command.
2.6 Configuration 5 Configuration 5 is the data/voice/fax configuration with two MultiMux MMV1608C/56/V multiplexers with single composite link connecting a minicomputer and a PBX trunk at the local site to a group of remote terminals and printer on the data part of the network and a second PBX trunk on the voice/fax channels.
Configuration 5 Local site Voice/Fax Channel Parameters LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2 PARAMETER STATUS PARAMETER STATUS DESTINATION CHANNEL: 01 DESTINATION CHANNEL: 02 DESTINATION NODE: 01 DESTINATION NODE: 01 LINK A/B/D: A LINK A/B/D: A DIGITIZING RATE: 16000 DIGITIZING RATE: 16000 OUTPUT LEVEL ATTEN.
2.7 Configuration 6 Configuration 6 is the data/voice/fax configuration with two MultiMux MMV1608C/56/V multiplexers with single composite link connecting a minicomputer and a telephone and/or fax mac.
Configuration 6 Local Site Voice/Fax Channel Parameters LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2 PARAMETER STATUS PARAMETER STATUS DESTINATION CHANNEL: 01 DESTINATION CHANNEL: 02 DESTINATION NODE: 01 DESTINATION NODE: 01 LINK A/B/D: A LINK A/B/D: A DIGITIZING RATE: 16000 DIGITIZING RATE: 16000 OUTPUT LEVEL ATTEN.
2.8 Configuration 7 Configuration 7 is the data/voice/fax configuration with two MultiMux MMV1608C/56/V multiplexers with single composite link connecting a minicomputer and a PBX E&M trunk at the.
Configuration 7 Local Site Voice/Fax Channel Parameters LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2 PARAMETER STATUS PARAMETER STATUS DESTINATION CHANNEL: 01 DESTINATION CHANNEL: 02 DESTINATION NODE: 01 DESTINATION NODE: 01 LINK A/B/D: A LINK A/B/D: A DIGITIZING RATE: 16000 DIGITIZING RATE: 16000 OUTPUT LEVEL ATTEN.
2.9 Configuration 8 Configuration 8 is a LAN to LAN configuration with two MultiMux MMV1608C/56/V multiplexers with a single composite link. The muxes are connecting two local area networks (LANs) thr.
Chapter 3 -.
4.1 Introduction This chapter explains how to unpack and install your MultiMux cabinet. 4.2 Unpacking Unpack and check all the items in the MultiMux shipping list to ensure that you have received the correct options and accessories. MultiMux Components A.
Sync Data Channel - Port B only If Port B is being connected to a synchronous device, connect the back-to-back cable supplied with your MultiMux to the COMPOSITE LINK B (RS232C/V.35) EXTERNAL MODEM/DSU connector on the back panel of the MultiMux and the other end of the cable to the RS232C connector on the synchronous device.
Figure 4-2. Composite Link Cabling 2 Loosen the two pc board chassis lock screws on the back panel. See Figure 4-2. 3 Pry up on the two pc board chassis lock screws to unlock the pc boards in the chassis. Temporarily retighten these screws while in the up position.
Figure 4-4. Shunts 11 Partially slide the Aggregate board into the chassis. 12 If the Voice/Fax board is in the chassis, connect the short ribbon cable between the Aggregate board and the Voice/Fax board. This ribbon cable goes on the front left side of the Aggregate board and is the only connector on the Voice/Fax board.
3 If you are connecting a supervisory console to the MultiMux, connect a terminal or PC to the COMMAND PORT connector via an appropriate RS232C cable. The PC must be running communications software. Note Any cables connected to the computer should be shielded to reduce interference.
As you change parameters, they will not actually be incorporated into your running system until you execute a Store New Parameters ( &W ) command. Table 4-3.
17 Based on the listed conditions for the Voice/Fax channels, reconfigure the parameters to match your actual Voice/Fax channel requirements by entering commands as described in Chapter 5. As you change parmeters, they will not actually be incorporated into your running system until you execute a Store New Parameters ( &W ) command.
5.1 Introduction This chapter presents a command summary followed by a detailed description of each command used in the MultiMux. Each command line must begin with a prefix of AT and may contain any number of commands in a string (no spaces) up to a limit of 40 characters.
F14 Xoff/Xon Character Pacing I0-2 Identification Commands L,L0 List all Channel Parameters L1-L32 List individual Channel Parameters ML Link Used Per Channel P0 Parity None P1 Parity Odd P2 Parity Even R Response Time Priority SB Stop Bit Selection SN Local Source Node Number Table 5-1.
&T5 Digital Loop &T6 Not Functional &T7 Switch and LEDs &T8 Memory Test &T9 Watch Dog Timer Test &T10 Internal Modem Memory Test &T11 Quick Brown Fox Message Test &T12 .
Store New The Store New Parameters command causes the MultiMux to Parameters store new parameters. Prior to executing the &W command, changes to MultiMux parameters are temporary and do not &W affect the units operation until you execute the &W command.
$DSUACL - SELECTS CLOCKING FOR INTERNAL DSU LINK A. $DSUBCL - SELECTS CLOCKING FOR INTERNAL DSU LINK B. $DSUASP - SELECTS SPEED FOR INTERNAL DSU LINK A. $DSUBSP - SELECTS SPEED FOR INTERNAL DSU LINK B. EXTERNAL DSU/MODEM $MUXACL - SELECTS CLOCKING WHEN USING EXTERNAL DSU/MODEM PORT A.
COMMAND EXAMPLE : ATV2LIFXSL- SETS THE LOCAL INTERFACE OF CHANNEL 2 TO FXS WITH LOOP START. FOR HELP ON A SPECIFIC COMMAND, ENTER ATH FOLLOWED BY A COMMAND LETTER. 5.2.2 Channel Parameter Commands Channel Off The channel off command turns the selected channel off.
data transfers are regulated so that no data is lost. DA T A DA T A CHANNEL DEVICE INITIA TED P ACING Channel Device Channel Device Mux Mux MUX INITIA TED FLOW CONTROL Flow control stops the input of .
Xon/Xoff Flow Control and Pacing, you will F11-F12 end up with Xon/Xoff Pacing, and with CTS Flow Control plus Pacing, data flow will be controlled by the presence of the DTR (pin 20) signal on the RS232 interface. F11 turns on Inverted DTR so that a high signal stops data flow and a low starts data flow.
operations, do not use too much of the buffer and reduce the throughput of the other channels to unsatisfactory levels. In such cases, the interactive user who needs immediate responses would experience unreasonable delays. The Response Time Priority numbers 0, 1, 2, 3 establish the relative time each group of channels must wait for data.
Select Local The Select Local Parameters command lists the local channel Parameters parameters and enables you to update them. After execution of this command, all other commands will act on the local &SL parameter set. An &W command stores the parameters.
When the Sync Data Channel is used and the MultiMux is providing the clocking, a word of caution; the Mux Speed command should not be set so high that the Sync Data Channel over runs the composite link. Things to consider are that if a voice/fax board is installed, voice takes the highest priority (voice compression is either 9.
EXTERNAL 64K INTERNAL OFF CONFIGURATION OF PORT A: COMPOSITE LINK DSU TYPE SPEED CLOCKING LOOPBACK EXTERNAL 56K INTERNAL OFF CONFIGURATION OF PORT B: SYNC DATA PROTOCOL SPEED CLOCKING LOOPBACK ANY SDLC 56K INTERNAL OFF List Composite This command lists the status of the link configuration parameters.
E L EE E L EE T O MS T O MS CR C O T CR C O T AA T T AA T T RN R E RN R E RS L M RS L M IR X C M RD O IR X C M R D O E CM T I C W D E CM T I CW D RV TS T V N E RV T S T V N E #X X # #X X # 5.2.5 Voice/Fax Channel Commands The Voice/Fax Channel commands control the traffic of the voice and fax communication over the composite link network.
2 to transfer data using the dynamic link selection which allows the MultiMux to select the least busy link. Voice/Fax Channel The Voice/Fax Channel Digitizing Rate command selects from Digitizing Rate two digitized or compressed rates 9600 or 16000 bps.
4.75db V(1/2)OL8 -6.0db 4.0db V(1/2)OL9 -6.75db 3.25db V(1/2)OL10 -7.5db 2.5db V(1/2)OL11 -8.25db 1.75db V(1/2)OL12 -9.0db 1.0db V(1/2)OL13 -9.75db 0.25db V(1/2)OL14 - 10.5db -0.5db V(1/2)OL15-11.25db -1.25db V(1/2)OL16 -12.0db -2.0db V(1/ 2)OL17 -12.
ATV(1/2)LIFXSL FXS w/Loop Connects a single Start Line telephone/fax with a loop start line to the mux. ATV(1/2)LIE&M(1-5) E&M Interface Connects to E&M trunk (D/W)(2-4) side of a PBX.
Test Mode 7 Test Mode 7 is the Switch and LED operational test. By running your MultiMux in this test mode, you can switch the eight &T7 DIP-switches and verify that they work by corresponding LEDs being lit. Test Mode 8 Test Mode 8 is the Non-Volatile Memory test.
6.1 Introduction The following procedures assume that your MultiMuxes (local and remote) have been installed properly (refer to Chapter 4) and the appropriate channel devices have been connected to each channel.
The following will be displayed on your system monitor if your MultiMux is configured with Port B as a synchronous data channel: Configuration of Port A: Composite Link DSU TYPE SPEED CLOCKINGLOOPBACK.
8To reconfigure a channel based on your actual channel requirements, enter commands as described in Chapter 5 of this manual. To save new parameters, you must again execute an AT&W command.
DIALTONE/WINK (E&M): N/A DIALTONE/WINK (E&M): N/A WINK TIMER N/A WINK TIMER N/A REMOTE INTERFACE TYPE: FXS REMOTE INTERFACE TYPE: FXS GROUND/LOOP START (FXS): LOOP GROUND/LOOP START (FXS): LOOP 2 OR 4 WIRE (E&M): 2 WIR E 2 OR 4 WIRE (E&M): 2 WIRE DIALTONE/WINK (E&M): N/A DIALTONE/WINK (E&M): N/A Table 6-2.
Table 6-2. Command Modem Operating Procedures (Cont.) Step Procedure 4You are now communicating with your remote MultiMux. Any commands you now execute will be done by the remote unit.
7.1 Introduction The MultiMux is designed to make it easy to operate and maintain. The procedures in this chapter will help isolate any problem you have to a specific component of your network, at which point you will be instructed to call the appropriate personnel or execute commands to adjust operating conditions.
7.3 Test Cables If you are using the MultiMux internal DSU, there are two test cables provided which can be used to help checkout your system (refer to Figure 7-1). The MultiMux Test cable is a special back-to-back composite link test cable that can connect your two MultiMuxes locally before installing them using a phone line.
not communicating not installed on Supervisory supervisory console, refer to comm with mux command Console. software users manual forinstallation. port 2.
RD LEDs ON 2. Connect composite link cable between mux and modem. Composite link and all 1. Mux memory failure 1. Enter ATL and record all channel channels down with parameters before running memory RD and all channel test. Perform memory test by entering RCV LEDs ON &T2 command.
T able 7-2. V oice/Fax T roubleshooting Guide Condition Possible Cause Corrective Action Volume levels not 1. Input level gain setting too 1. Increase input level gain setting on sufficient on local low on remote voice/fax remote voice/fax channel a couple voice/fax channel channel.
interface connector type. 3. Voice/fax ribbon cable 1 . R e c onnect the voice/fax ribbon cable n o t connected. between the voicefax and aggregate board. Refer to the installation procedures in Chapter 4. 2. Call Tech Support for assistance, refer to Chapter 8.
7.5 Channel Device Testing The first step in system testing is to check the operation of the multiplexer network section from each channel device to the MultiMux and back again to the channel device.
7.6 DSU and Communications Line Testing After determining that the channel-device-to-MultiMux portion of the multiplexer network is operating properly, the next steps are to check the operation of the local DSU, the communications line and the remote DSU.
7.7 MultiMux Functional Testing Procedures There are tests available on the MultiMux which check various functions within the MultiMux logic. These tests will assist you in trouble shooting problems which are not related to the composite communications channel or local channel devices.
7.8 Voice/Fax Channel Testing The voice/fax loopback test is confined to the MultiMux that the test is being run on. the loopback test communicates between the two channels on the voice/fax board without going outside the MultiMux.
7.9 Sync Data Channel Testing The Sync Data Channel Loopback test is used when the MultiMux has configured Port B for the sync data mode. This test simulates a modem or DSU in sync loopback mode. To use this test, configure the synchronous device for loopback test in which port B loops the data back to the synchronous device.
Chapter 8 - Service, W arranty and T ech Support Warranty Multi-Tech Systems, Inc., (hereafter MTS) warrants that its products will be free from defects in material or workman- ship for a period.
Extended two-year overnight replacement service agreements are available for selected products. Please call MTS at (888) 288-5470, extension 5308 or visit our web site at http://www.
Appendix A ASCII Character Code/Hex/Decimal Conversion Chart CTRL CODE HEX DEC CODE HEX DEC CODE HEX DEC CODE HEX DEC @ NUL 00 0 SP 20 32 @ 40 64 60 96 A S OH 01 1 ! 21 33 A 41 65 a 61 97 B ST X 02 2 .
Appendix B RS232C Interface Specification The MultiMux RS232C interface circuits have been designed to meet the electrical specifications given in the EIA (Electronic Industries Association) RS232C and CCITT (Consultative Committee of International Telegraph and Telephone) standards.
Appendix C Cabling Diagrams Channel Cable DCE to Channel cabling (with EIA pass Thru) 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 MultiMux Channel Connector To DCE Device (Communication Device i.
Command Port Cables DCE to DCE cabling 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 MultiMux Command Port Connector To DCE Device (Communication Device i.e. Modem) CHASSIS GROUND (AA) TRANSMIT DA T A (BA) RECEIVE DA T A (BB) DA T A SET READY (CC) SIGNAL GROUND (AB) DA T A TERMINAL READY (CD) PIN NO.
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 Connector To MultiMux External Modem/DSU Connector CHASSIS GROUND (AA) TRANSMIT DA T A (BA) RECEIVE DA T A.
25-PIN CONNECTOR (FEMALE) 1 2 3 4 5 7 6 8 15 17 20 24 1 3 2 5 4 7 20 24 6 8 15 17 Frame Ground Transmit Data Receive Data Request T o Send Clear T o Send Signal Ground Data Set Ready Carrier Detect Tr.
E&M (I-V) 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 is solid 24AWG.
Appendix D Command Modem Commands Answer A The Answer Mode forces the command modem into answer mode. Entering ATA when in the Command mode will immediately bring the command modem off-hook, out of the command mode and into the On-Line Answer mode, and cause it to retransmit its carrier signal over the phone line.
Hanging Up, You can make the command modem hang up (go On Hook), or and go Off Hook, with the H command. Entering ATH1 (upper case) Bringing the will bring the line Off Hook just as if you had picked up the Phone Line telephone handset. The command modem remains in command Off Hook mode.
in the when the command letter R is entered at the end of a Dialing dialing command. When this is done, the command modem will switch to Answer mode as soon as the number is dialed R and then transmit a carrier signal to the other modem.
13 DATA Command modem connected as data modem during auto answer. You can also choose to completely eliminate the display of all of the Result Codes. This is accomplished by executing the Q command.
The ATX4 command causes the command modem to wait for a dial tone before dialing. This command is referred to as the smart dialing method where as the ATX3 command is referred to as blind dialing. The CONNECT xxxx result codes are activated and the BUSY result code is enabled if a busy signal is detected from the called command modem.
pause is desired, more than one comma may be entered , consecutively, with each one causing a two second pause. You also have the option of changing the length of the pause of the comma, from two seconds to any other value from 0 up to 255 seconds. This is accomplished by accessing S-Register S8, which we explain in Appendix E.
Appendix E Indicators/Switches and Connectors Indicators Figure E-1. M ultiMux Front Panel Table E-1. LED Indicators Indicator Description Channel XMT/RCV The Channel Transmit (XMT) and Receive (RCV) indicators show the activity level on each channel.
FCR The Flow Control Received (FCR) indicator lights when the remote MultiMux's buffers are full and the local MultiMux has been told to stop sending data. The FCR indicator will only come On when flow control is active. The FCR indicator lights for both internal DSU and an external link device.
Figure E-2. B ack Panel ON/OFF Switch This switch provides AC power to the MultiMux when placed in the On (UP) position and removes power when in the OFF (down) position. Power Connector The power connector is a receptacle for the 3-prong grounded power cord supplied with the MultiMux.
The voice/fax channel 2 E&M (Ear and Mouth) connector is used to connect channel 2 of the MultiMux to the trunk side of the local private branch exchange (PBX, a small switch). This connector is used when the voice/fax feature is included in the MultiMux.
The aggregate board 8-position DIP switch SW-5 is shown in Figure E-3 and the function of each position is as follows: Switch position 1: Closed Initiate Downline Load Off Open(UP) Initiate Downline L.
Appendix F Flow Control Background Flow control refers to the techniques used by computer devices and multiplexers to stop and restart the flow of data from each other. Flow control is necessary so that a channel device does not receive more data than it can handle or vice versa (the MultiMux receives more data than its buffers can accommodate).
In the example below, the flow control on the minicomputer works as follows: 1 2 3 4 5 6 7 8 Mux Link Channel Mini- Computer A. B. C. D. mux process data to the link mux buffers full mux buffers empty mux processes data to the link Data Flow Control off Flow Control on Data A.
Printer pacing and Flow Control The example below shows how Pacing and Flow Control work on a printer. (Host) Mini- Computer Channel MUX Link MUX Channel (Remote) Printer 1 1 A.
Glossary of T erms 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.
Bit-synchronous transmission: A synchronous form of data transmission that focuses on a maximum packet size rather than the length of the characters the packet contains. SDLC is a bit-synchronous protocol. Boot: To start or restart your PC. This term originates from the saying " to pull oneself up by the bootstraps".
Device driver: Software that controls how a computer communicates with a device, such as a printer or mouse. Digital signal: Digital devices, such as terminals and computers, transmit data as a series of electrical pulses which have discrete jumps rather than gradual changes.
Frequency: A characteristic of an electrical or electronic signal which describes the periodic recurrence of cycles. Frequency is inversely proportional to the wavelength or pulse width of the signal (i.e., long wavelength signals have low frequencies and s hort wavelength signals yield high frequencies).
Modem: A communications device that enables a computer to transmit information over a telephone line. It converts the computer's digital signals into analog signals to send over a telephone line and converts them back to digital signals at the receiving en d.
Rack: A frame or cabinet into which components are mounted. The industry standard rack is 19" wide and has variable depth and height. Rackmount: A packaging style available for many types of electronic equipment which enables the installer to mount the equipment in an industry standardized enclosure.
V.22bis: The CCITT modulation standard for 2400 bps, full-duplex transmission over a dial-up or 2-wire leased line. V.23: The CCITT modulation standard for 75/1200 bps, half-duplex transmission over dial-up lines. This is not common in North America. V.
Index Symbols &W Command .. .. . .. .. .. . .. .. .. .. . .. .. .. .. . .. .. .. .. . 5- 5 2400 BPS MODEM DIAL-UP LINE Connector 3-5, 4-5 25-pin Female D Connectors . .. ... .. ... ... . 1-17 4-Position DIP Switch .. ... ... ... ... .. ... ... ...
Command Modem Select Command #MA1 5-27 COMMAND PORT .. ..... ..... .... ..... .... 1-8, 1-9 Command Port . ... ... .. ... ... .. ... .. ... ... 1-1, 1-12 Command Port Cables .. .. ... .. ... .. ... .. ... .. .. C-2 COMMAND PORT Connector .... .... ...
.. ... .. ... .. ... .. ... .. ... .. ... .. ... .. ... .. ... .. ... .. .. 4-1, C-5 E&M to E&M .... .... .... ..... .... .... .... .... .... .... . 2-1 E&M Wink .. .. . .. .. .. .. .. .. .. . .. .. .. .. .. .. .. .. . .. .. .. .. . 2-1 Ear and Mouth .
LED Indicators ... .. ... ... .. ... ... .. ... ... .. ... ... ... . 3-2 Limited Warranty . .. ... .. ... .. .. ... .. .. ... .. 1-2, 8-1 Line Interface . ... .. ... ... .. ... ... .. ... ... .. ... ... .. . 1-18 Link Protocol . .. ... .. ... .. ... .
Parity ... ... .... ... ... ... .... ... ... ... .... ... ... ... .... .. 1-17 Parity Select Command (P0-P2) . ... ... ... 5-13 Parts of your Mux Network ... .... ... .... .... ... 7-3 Pass EIA Signal Commands (F7-F8) ... 5-11 Pass Xon/Xoff Command (F9-F10) .
Source Node Command (SN) ... ... ... .. ... 5-13 Specifications . ... .. ... ... ... .. ... ... ... .. ... ... ... . 1-17 Stat Muxes .. ... ... .... ... .... ... .... ... .... ... .... ... .. 1-3 Statistical Multiplexers ... ... ... .. ... ... ... ...
VOICE/FAX CHANNEL 2 FXO Connector .............................................................. 3-7 VOICE/FAX CHANNEL 2 FXS Connector .............................................................. 3-7 Voice/Fax Channel Parameters .. .. ... ... . 2-10 Voice/Fax Channels .
Un point important après l'achat de l'appareil (ou même avant l'achat) est de lire le manuel d'utilisation. Nous devons le faire pour quelques raisons simples:
Si vous n'avez pas encore acheté Multi-Tech Systems MMV1600 c'est un bon moment pour vous familiariser avec les données de base sur le produit. Consulter d'abord les pages initiales du manuel d'utilisation, que vous trouverez ci-dessus. Vous devriez y trouver les données techniques les plus importants du Multi-Tech Systems MMV1600 - de cette manière, vous pouvez vérifier si l'équipement répond à vos besoins. Explorant les pages suivantes du manuel d'utilisation Multi-Tech Systems MMV1600, vous apprendrez toutes les caractéristiques du produit et des informations sur son fonctionnement. Les informations sur le Multi-Tech Systems MMV1600 va certainement vous aider à prendre une décision concernant l'achat.
Dans une situation où vous avez déjà le Multi-Tech Systems MMV1600, mais vous avez pas encore lu le manuel d'utilisation, vous devez le faire pour les raisons décrites ci-dessus,. Vous saurez alors si vous avez correctement utilisé les fonctions disponibles, et si vous avez commis des erreurs qui peuvent réduire la durée de vie du Multi-Tech Systems MMV1600.
Cependant, l'un des rôles les plus importants pour l'utilisateur joués par les manuels d'utilisateur est d'aider à résoudre les problèmes concernant le Multi-Tech Systems MMV1600. Presque toujours, vous y trouverez Troubleshooting, soit les pannes et les défaillances les plus fréquentes de l'apparei Multi-Tech Systems MMV1600 ainsi que les instructions sur la façon de les résoudre. Même si vous ne parvenez pas à résoudre le problème, le manuel d‘utilisation va vous montrer le chemin d'une nouvelle procédure – le contact avec le centre de service à la clientèle ou le service le plus proche.
