Page 2 - Class A
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. This equip...
Page 3 - Owners Manual; Record of Revisions; Manual revised with minor editorial comments.; Patents; TRADEMARK
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. Multi-Tech Systems, Inc. makes ...
Page 4 - Table of Contents; Chapter 1 - Introduction and Description
Table of Contents Chapter 1 - Introduction and Description 1.1 Introduction .......................................................................................... 1-1 1.2 About This Manual ............................................................................... 1-1 1.3 Background ...........
Page 5 - Appendices
Chapter 5 - Commands 5.1 Introduction .......................................................................................... 5-1 5.2 Command Description ......................................................................... 5-5 5.2.1 General Commands .............................................
Page 6 - Tables
Tables 3-1 LED Indicators ..................................................................................... 3-2 4-1 Cabling Procedure ............................................................................... 4-1 4-2 V.35 Interface ..............................................................
Page 7 - About This Manual; channel groups. The back panel provides all the cable connections.
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 Multiplexer (PSM) supports up to 16 or 32 asynchronous input channels, two synchronous composite links or...
Page 8 - Chapter 8- Service, Warranty and Tech Support
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-...
Page 9 - Background; connected to each multiplexer.; Figure 1-2. Simple Communications Network; Description of Statistical Multiplexing; using individual modems for each PC or terminal.; Statistical Multiplexing; speeds that are less than the sum of the individual channel speeds.
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). A stat mux performs the function of combining several asynchronous data communication channel...
Page 10 - link without the need for a separate voice network.
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, ...
Page 12 - used to configure the channel devices.
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 connect...
Page 13 - up to four other muxes in a network.
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. The two voice/fax channels provide all the necessary interfaces to access a private branch exc...
Page 14 - use it without having to reconfigure it.
DATA DATA CHANNEL DEVICEINITIATED PACING ChannelDevice ChannelDevice Mux Mux MUX INITIATEDFLOW CONTROL Pacing stops the outputof 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 channel...
Page 15 - Dynamic Buffering; buffer per channel is assigned on an as-needed basis.; Response Time Control; priority so it will not crowd out the others.; Synchronous Data Channel
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. In th...
Page 16 - FCC Regulations for Telephone Line Interconnection; DOC Terminal Equipment; company cause to request the user to disconnect the equipment.; Caution; The; Load Number; exceed 100. The load number for the Command Modem is 7.
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). If requested, this information...
Page 19 - Introduction; Model
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...
Page 20 - Configuration 1
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 fac...
Page 22 - Configuration 2; changed using the List Composite Link Configuration (; Configuration 2 Composite Link Configuration
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 MODE...
Page 23 - Configuration 3; Remote Site 1; Remote Site 2
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 minicompu...
Page 25 - Configuration 4; and; Configuration 4 Local Site Voice/Fax Channel Parameters; and
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 at the local site to a group of remote terminals and printer on the data part of the network and a t...
Page 26 - Commands of this manual.; Configuration 4 Remote Site Voice/Fax Channel Parameters
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. The voice/fax channel parameters for the remote...
Page 27 - Configuration 5; command and; VL; Commands of this manual.
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 trun...
Page 28 - Configuration 5 Local site Voice/Fax Channel Parameters; Configuration 5 Remote Site Voice/Fax Channel Parameters
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: 160...
Page 29 - Configuration 6; V1LIFXS
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 machine at the local site to a group of remote terminals and printer on the data part of the network an...
Page 30 - Configuration 6 Local Site Voice/Fax Channel Parameters; Configuration 6 Remote Site Voice/Fax Channel Parameters
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: 160...
Page 31 - Configuration 7; a telephone and/or a fax machine on the second channel.; command for; V1RIFXS; and or; V2RIFXS
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 local site to a group of remote terminals and printer on the data part of the network and a telepho...
Page 32 - Configuration 7 Local Site Voice/Fax Channel Parameters; Configuration 7 Remote Site Voice/Fax Channel Parameters
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: 160...
Page 33 - Configuration 8; fax communications are set up per configuration 5.
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) through the Sync Data Channel, connecting a communications server on one LAN to a minicomputer at a rem...
Page 35 - Unpacking; MultiMux Components; Installation Procedure
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. MultiMux Cabinet B. Owner's Manual C. Power ...
Page 36 - Note
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...
Page 37 - Step; Remove the Aggregate board from the chassis.
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. 4 Disconnect the pc board power cab...
Page 39 - Command Modem
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. 4 Apply power to...
Page 40 - Store New Parameters (; parameter status for your local
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. Configuration Procedure Step Procedure Async Channels 14 Execute the parameter display command to display the current channel parameter st...
Page 44 - Command Description; General Commands
&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 Voice/Fax Loopback Test &T13 Sync Data Channel Loopback Test Command A/ Repeat Last Command Mode...
Page 47 - Channel Parameter Commands
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 T h e c h a n n e l o f f c o m m a n d t u r n s t h e s e l e c t e d c h a n n e l o f...
Page 51 - Composite Link Speed and Clocking Commands
Select Local T h e S e l e c t L o c a l P a r a m e t e r s c o m m a n d l i s t s t h e l o c a l c h a n n e l Parameters p a r a m e t e r s a n d e n a b l e s y o u t o u p d a t e t h e m . A f t e r e x e c u t i o n o f t h i s c o m m a n d , a l l o t h e r c o m m a n d s w i l l a c t ...
Page 52 - Additional Composite Link Commands
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 (...
Page 54 - Voice/Fax Channel Commands
E L E E E L E E T O M S T O M S C R C O T C R C O T A A T T A A T T R N R E R N R E R S L M R S L M I R X C M R D O I R X C M R D O E C M T I C W D E C M T I C W D R V T S T V N E R V 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 t...
Page 57 - Test Commands
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. (1-5) Selects E&M type 1-5. (D/W) Selects E&M dial or wink (2/4) Selects E&M 2 or 4-wire Vo...
Page 58 - Command Modem Commands
Test Mode 7 Test Mode 7 is the Switch and LED operational test. By running your MultiMux in this t e s t m o d e , y o u c a n s w i t c h t h e e i g h t &T7 DIP-switches and verify that they work by corresponding LEDs being lit. Test Mode 8 T e s t M o d e 8 i s t h e N o n - V o l a t i l e M...
Page 59 - MultiMux Operating Procedures; Table 6-1. MultiMux Operating Procedures
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. 6.2 MultiMux Operating Procedures The MultiMux operating procedures cover entering param...
Page 61 - Voice/Fax Operating Procedures
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. 9If you are downline loading remote parameters, 8-position DIP switch SW1 must be in the UP (open) positio...
Page 62 - caution; Command Modem Operating Procedures; Table 6-3. Command Modem Operating Procedures
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 WIRE 2 OR 4 WIRE (E&M): 2 WIRE DIALTONE/WINK (E&M): N/A DIALTONE/...
Page 63 - Command by entering the following:
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. For instance, to request status of the remote system execute the List Channel Parameters Command by entering the fo...
Page 64 - personnel or execute commands to adjust operating conditions.; Importance of Composite Statistics; The Composite Statistics Command
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 oper...
Page 65 - Test Cables; Troubleshooting Guide; Condition
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 install...
Page 70 - Channel Device Testing; as correct characters on the channel devices monitor.; Table 7-3. Channel Device Testing Procedure; The MultiMux must have downline loading turned
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. These procedures will let you see if data from the channel device is passing through the MultiMux pr...
Page 71 - DSU and Communications Line Testing; Table 7-4. DSU and Communications Line Testing Procedure; The supervisory console will display the following message:
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. By performing the procedures in Table 7-4, t...
Page 72 - MultiMux Functional Testing Procedures; Table 7-5. MultiMux Functional Testing Procedures
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. The two tests...
Page 73 - Voice/Fax Channel Testing; on the same MultiMux unit.
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. An important factor to consider before running this test is to ensur...
Page 74 - Sync Data Channel Testing; Table 7-7. Sync Data Channel Testing Procedure
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...
Page 75 - Chapter 8 - Service, Warranty and Tech Support; Warranty; LIABILITY EXCEED THE PRICE FOR DEFECTIVE PRODUCTS.; Repair Procedures for U.S. and Canadian Customers; For out of warranty repair charges, go to
Chapter 8 - Service, Warranty and Tech 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 of two, five, or ten years (depending on model) from date of purchase, or if proof of purchase is not pro...
Page 76 - for details on rates and coverages.; . Please direct your; Repair Procedures for International Distributors; Copyright
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.multitech.com/programs/orc/ for details on rates and coverages. Please direct your questions regarding technical matt...
Page 77 - Appendix A; ASCII Character Code/Hex/Decimal Conversion Chart
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 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 0...
Page 78 - Appendix B; RS232C Interface Specification; NEGATIVE
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. All signals gen...
Page 79 - Appendix C; Cabling Diagrams; Channel Cable; DCE to Channel cabling (with EIA pass Thru)
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 ToMultiMuxChannelConnector ToDCEDevice (CommunicationDevicei.e. Modem) CHASSIS GROUND (AA) TRANSMIT DATA (BA) RECEIVE DATA (BB) REQUEST TO SEND (CA) CLEAR T...
Page 80 - Command Port Cables; DCE to DCE cabling
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 ToMultiMuxCommandPortConnector ToDCEDevice (CommunicationDevicei.e. Modem) CHASSIS GROUND (AA) TRANSMIT DATA (BA) RECEIVE DATA (BB) DATA SET READY (CC) SIGNAL GROUND (AB) DATA TERMINAL READY (CD) PIN NO....
Page 81 - 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 ToExternalSynchronousModem/DSUConnector ToMultiMuxExternalModem/DSUConnector CHASSIS GROUND (AA) TRANSMIT DATA (BA) RECEIVE DATA (BB) REQUEST TO SEND (CA) CLEAR TO SEND (CB) SIGNAL GROUND (AB) CARRIER DETECT (CF) TRANSMIT CLOCK (DB) RECEIVE...
Page 82 - Back to Back Mux Cable
25-PIN CONNECTOR (FEMALE) 12345768151720 24 13254720 24 681517 Frame GroundTransmit DataReceive DataRequest To SendClear To Send Signal GroundData Set ReadyCarrier DetectTransmit ClockReceive ClockData Terminal Ready Internal Clock 25-PIN CONNECTOR (FEMALE) Frame Ground (AA)Receive Data (BB)Transmit...
Page 83 - Voice/Fax Channel Connectors; Pin Connection
E&M (I-V) Voice/Fax Channel Cable White-Green Green-White White-Orange White-Blue Blue-White Orange-White Brown-WhiteWhite-Brown M InputE OutputT1 4-Wire OutputR 4-Wire Input, 2-WireT 4-Wire Input, 2-WireR1 4-Wire OutputSG (Signal Ground) OutputSB (Signal Battery) Output E&M CABLE RJ45 Plug ...
Page 84 - Appendix D
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 ...
Page 90 - Appendix E; Indicators/Switches and Connectors; Indicator; internal DSU and an external link device.
Appendix E Indicators/Switches and Connectors Indicators Figure E-1. MultiMux 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. MultiMux MMV1608 uses Channel One through Channel...
Page 91 - Indicates that the dial-up line for the command modem is off-hook.; Back Panel
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. RD ...
Page 94 - Channel Board Number of Channels Switch
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 Load On (used for downline loading only) Switch position 2: Closed External Link A Device Selected Op...
Page 95 - Appendix F; Flow Control Background; pacing is something the channel device does to the mux.; are also selecting the corresponding pacing method.; MiniComputer Flow Control
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 receiv...
Page 96 - mini stopping data output.
In the example below, the flow control on the minicomputer works as follows: 12345678 Mux Link Channel Mini- Computer A. B. C. D. mux processdata to the link mux buffers full mux buffers empty mux processes data to the link Data Flow Control off Flow Control on Data A. Data volume from the mini for ...
Page 97 - Printer pacing and Flow Control; turn, causes a Flow Control ON signal through to the mini.
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. B. C. D. E. F. G. H. Printer PrintsDataPrint BufferFull Print Data Pace off Flow Control off Flow Control off Flow Control...
Page 98 - Glossary of Terms; Asynchronous Transmission:
Glossary of Terms 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&...
Page 100 - Digital Transmission:
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. Digital Transmission: A...
Page 105 - Index; Symbols; Additional Composite Link Commands 5-17
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 .......................... 3-10 8-Position DIP Switch SW1 .................... 6-4 A Additional Composite Link...
Page 107 - EXTERNAL COMPOSITE LINK
...................................................... 4-1, C-5 E&M to E&M .......................................... 2-1 E&M Wink .............................................. 2-1 Ear and Mouth ....................................... 1-6 Ear and Mouth (E&M) Indicator .................