MultiMux MMV1600/3200 Series Data/Voice/Fax Priority Statistical 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. This equipment generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
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 no representations or warranties with respect to the contents hereof and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose.
Table of Contents Chapter 1 - Introduction and Description 1.1 Introduction .......................................................................................... 1-1 1.2 About This Manual ............................................................................... 1-1 1.3 Background .......................................................................................... 1-3 1.3.1 Description of Statistical Multiplexing ...................................... 1-4 1.4 Product Description ............
Chapter 5 - Commands 5.1 Introduction .......................................................................................... 5-1 5.2 Command Description ......................................................................... 5-5 5.2.1 General Commands ................................................................ 5-5 5.2.2 Channel Parameter Commands .............................................. 5-9 5.2.3 Composite Link Speed and Clocking Commands ................... 5-16 5.2.
Tables 3-1 LED Indicators ..................................................................................... 3-2 4-1 4-2 4-3 Cabling Procedure ............................................................................... 4-1 V.35 Interface ....................................................................................... 4-4 Configuration Procedure ...................................................................... 4-7 5-1 Command Summary ...................................................
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 a synchronous composite link and a sync data channel, and two voice/fax channels. The MultiMux is completely software driven and is controlled by you through its command port.
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). A stat mux performs the function of combining several asynchronous data communication channels into one composite synchronous signal that can be transmitted between two locations more inexpensively than the cost of the individual lines. Figure 1-2 shows a simple communications 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, 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. The E&M (Ear and Mouth) connection is for connecting to the E&M trunk side of a PBX.
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. The two voice/fax channels provide all the necessary interfaces to access a private branch exchange (PBX, a small telephone switch) and all the services provided by the PBX.
MUX INITIATED FLOW CONTROL CHANNEL DEVICE INITIATED PACING DATA DATA Channel Device Mux Flow control stops the input of data to the mux Mux Channel Device Pacing stops the output of data from the mux 1.5.7 Channel Switching A feature of the MultiMux MMV1600/MMV3200 series is its ability to switch channels between mux units. That is, an individual channel on a source node can be switched to any channel on its destination node.
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 the early days, a mux was sometimes judged by the size of its buffers.
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 must be provided to the telephone company. 2. A suitable jack (USOC connecting arrangement) for this equipment is shown.
1.8 Specifications 1.8.1 Async Data Channels Number of Channels Maximum Speed All Channels Channel Speeds Data Format Parity Local Echo Flow Control Pacing Interface Up to sixteen (#MMV16XXC), or up to thirty-two (#MMV32XXC) 19,200 bps All standard speeds from 300 bps to 19.2K bps Asynchronous: 5, 6, 7, or 8 data bits, with 1,1.
1.8.6 Voice Channels Number of Channels Voice Digitization Rates Automatic Fax Modulation/ Demodulation Interfaces Signaling Line Interface Two independent channels 9600 and 16K bps Group 3 Fax Rates (2400, 4800, 7200 and 9600) E&M 2 and 4 wire, FXS, FXO DTMF RJ48 Jack for E&M and RJ11 Jacks for FXS and FXO 1.8.7 Command Modem: Description Speeds Line Interface Bell 212A/103 & CCITT V.22bis/V.
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. The local site has the MMV1616C/56 connected to a host minicomputer. The remote site has fourteen terminals and two shared printers connected to the asynchronous channels of the remote mux.
Configuration 1 Local Site Channel Parameters Local Channel Parameters/ Node #02 STP CHN SPD WD BIT PAR 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 OK 19200 19200 19200 19200 19200 19200 19200 4800 19200 19200 19200 19200 19200 19200 19200 4800 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 NONE NONE NONE NONE NONE NONE NONE NONE NONE NONE NONE NONE NONE NONE NONE NONE FLOW CTRL XON/XOFF XON/XOFF XON/XOFF XON/XOFF XON/XOFF XON/XOFF XON/XOFF XON/XOFF XON/XOFF XON/XOFF XON/XOFF XON/X
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. The MMV1616Cs are set up for an external link device with a maximum link speed of 56,000 bps. Composite link A needs to be set up for external clocking.
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. Remote site 1 communicates with the local site and remote site 2 (Node 3) communicates through remote site 1 to the local site.
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. Node 3 has channels one through eight set for destination channels nine through sixteen of node 1. Node 2 passes through all communications between nodes 1 and 3.
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 telephone and fax machine on the remote voice/fax channels.
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 site are shown in the Configuration 4 Remote Site Voice/Fax Channel Parameters. The voice/fax channel parameters are described in Chapter 5 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 trunk on the voice/fax channels. The E&M configuration is shown in Figure 2-5. In this configuration the data communications is set up per configurations 1, 2, or 3.
Configuration 5 Local site Voice/Fax Channel Parameters LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2 PARAMETER DESTINATION CHANNEL: DESTINATION NODE: LINK A/B/D: DIGITIZING RATE: OUTPUT LEVEL ATTEN.: INPUT LEVEL GAIN: SILENCE SUPPRESSION: STATUS 01 01 A 16000 14 05 00 PARAMETER DESTINATION CHANNEL: DESTINATION NODE: LINK A/B/D: DIGITIZING RATE: 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 machine at the local site to a group of remote terminals and printer on the data part of the network and a second set of telephone and/or fax machine on the voice/fax channels. The FXS to FXS configuration is shown in Figure 2-6. In this configuration the data communications is set up per configuration 1.
Configuration 6 Local Site Voice/Fax Channel Parameters LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2 PARAMETER DESTINATION CHANNEL: DESTINATION NODE: LINK A/B/D: DIGITIZING RATE: OUTPUT LEVEL ATTEN.: INPUT LEVEL GAIN: SILENCE SUPPRESSION: STATUS 01 01 A 16000 12 03 00 PARAMETER DESTINATION CHANNEL: DESTINATION NODE: LINK A/B/D: DIGITIZING RATE: 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 local site to a group of remote terminals and printer on the data part of the network and a telephone and/or fax machine on the remote voice/fax channels. The E&M to FXS configuration is shown in Figure 2-7. In this configuration the data communications is set up per configuration 1.
Configuration 7 Local Site Voice/Fax Channel Parameters LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2 PARAMETER DESTINATION CHANNEL: DESTINATION NODE: LINK A/B/D: DIGITIZING RATE: OUTPUT LEVEL ATTEN.: INPUT LEVEL GAIN: SILENCE SUPPRESSION: STATUS 01 01 A 16000 12 03 00 PARAMETER DESTINATION CHANNEL: DESTINATION NODE: LINK A/B/D: DIGITIZING RATE: 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) through the Sync Data Channel, connecting a communications server on one LAN to a minicomputer at a remote site and connecting voice/fax communications between the two locations. The LAN to LAN configuration is shown in Figure 2-8.
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. MultiMux Cabinet B. Owner's Manual C. Power cord D. RJ48 phone cable (for internal DSU) E. RJ11 phone cable (for internal modem) F. Composite Link cable ( for external link device) G.
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. Refer to the synchronous device documentaiton for this connection.
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 cable from the power supply. See Figure 4-3. 5 Partially pull out all the pc boards in the chassis just past the inside edge of the data and address ribbon cable connectors.
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. Table 4-2. V.35 Interface (Cont.) Step Procedure 13 Reconnect the control ribbon cable on the right side between the Aggregate board and the Channel board(s).
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 the supervisory console and enter AT and then hit Return. If you get an OK message back, you are communicating with the Command Port. The Command Port operates at up to 19.2K bps.
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. Most commands include a value and are part of the 40 character total. Hitting Return executes a command line but does not incorporate it into the operation of your MultiMux.
F14 I0-2 L,L0 L1-L32 ML P0 P1 P2 R SB SN TYPE Channel Parameter (Cont.) COMMAND SNGA..H WL &F &SL &SR #S Xoff/Xon Character Pacing Identification Commands List all Channel Parameters List individual Channel Parameters Link Used Per Channel Parity None Parity Odd Parity Even Response Time Priority Stop Bit Selection Local Source Node Number Table 5-1. Command Summary (Cont.
&T5 &T6 &T7 &T8 &T9 &T10 &T11 &T12 &T13 Command Modem TYPE Command Modem (Cont.
Store New Parameters The Store New Parameters command causes the MultiMux to 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. The &W command stores the parameters in nonvolatile memory and will takes affect immediately. Help The Help commands are designed to give you short explanations on how to use MultiMux commands.
$DSUACL $DSUBCL $DSUASP $DSUBSP - SELECTS CLOCKING FOR INTERNAL DSU LINK A. SELECTS CLOCKING FOR INTERNAL DSU LINK B. SELECTS SPEED FOR INTERNAL DSU LINK A. SELECTS SPEED FOR INTERNAL DSU LINK B. $MUXACL $MUXBCL $MUXASP $MUXBSP $MUXB - EXTERNAL DSU/MODEM SELECTS CLOCKING WHEN USING EXTERNAL DSU/MODEM PORT A. SELECTS CLOCKING FROM EXTERNAL SYNC DEVICE ON PORT B. SPEED OF THE CLOCK IF SUPPLIED BY THE MULTIPLEXER PORT A. SPEED OF THE CLOCK IF SUPPLIED BY THE MULTIPLEXER PORT B.
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 Command allows B0 channels. Baud Rate Select The channel off command turns the selected command turns off a particular channel or all channels depending the more efficient use dynamically allocated buffers and allows the multiplexer to skip The Bxxxxx command selects the bps channel.
data transfers data is lost. are regulated so MUX INITIATED FLOW CONTROL DATA Mux Flow control stops the input of data to the mux ENQ/ACK Flow Control F3-F4 acknowledgment no CHANNEL DEVICE INITIATED PACING DATA Channel Device that Mux Channel Device Pacing stops the output of data from the mux These two commands control the selection of a special flow control system used in Hewlett Packard computer systems.
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. F12 turns off Inverted DTR so that it acts normal (high on and low off). If Flow Control is off, Pacing cannot be turned on. If Pacing is off, inverted DTR cannot be turned on. Xoff/First Char.
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. The lower the number the shorter the wait. Since this is a channel group command, it does not control priority per channel but per group.
Select Local Parameters &SL The Select Local Parameters command lists the local channel parameters and enables you to update them. After execution of this command, all other commands will act on the local parameter set. An &W command stores the parameters. When power is turned on, the local parameter mode is in effect. Select Downline Load Parameters The Select Downline Load Parameters command lists the remote mux channel parameters and enables you to update them.
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. Link Settings The display indicates the conditions that affect the link's operation, such as the downline load, flush timer value and the response #L time setting.
C A R R I E R # R C V X X M T X C T S # E T R A N S M I T L O C T R L R C V E M O T E E S T M D O W D N E C A R R I E R # R C V X X M T X C T S # E T R A N S M I T L O C T R L R C V E M O T E E S T M D O W D N E 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 select the least busy link. to transfer data using the dynamic link selection which allows the MultiMux to Voice/Fax Channel Digitizing Rate The Voice/Fax Channel Digitizing Rate command selects from two digitized or compressed rates 9600 or 16000 bps. At the 16000 bps rate, the voice transmission will be clearer. The V(1/2)DR V1DR9600 places voice/fax channel 1 at a digitized or compressed rate of 9.6K bps. Note, with silence suppression enabled, less than 9600 bps of the link is used.
4.75db V(1/2)OL8 V(1/2)OL10 -7.5db 2.5db V(1/2)OL11 V(1/2)OL12 -9.0db 1.0db 10.5db -0.5db V(1/2)OL15-11.25db 2)OL17 -12.75db -2.75db 4.25db COMMAND 16.5db 19.5db 22.5db LEVEL 2-Wire 4-Wire V(1/2)OL20 -15.0db -5.0db -6.5db V(1/2)OL23-17.25db V(1/2)OL24 -18.0db -8.0db -9.5db V(1/2)OL27-20.25db V(1/2)OL28 -21.0db -11.0db -12.5db V(1/2)OL31-23.25db -6.0db -8.25db V(1/2)OL13 -1.25db 4.0db V(1/2)OL9 -6.75db 3.25db 1.75db -9.75db 0.25db V(1/2)OL14 V(1/2)OL16 -12.0db -2.0db V(1/ V(1/2)OL18 -13.5db-3.
Start Line ATV(1/2)LIFXSL FXS w/Loop telephone/fax with a ATV(1/2)LIE&M(1-5) E&M Interface side of a PBX. (1-5) (D/W) (2/4) Connects a single Connects to E&M trunk loop start line to the mux. (D/W)(2-4) Selects E&M type 1-5. Selects E&M dial or wink Selects E&M 2 or 4-wire Voice/Fax Channel The Voice/Fax Remote Channel Interface command informs the Remote Interface local voice/fax channel of how the remote channel may be configured.
Test Mode 7 test &T7 Test Mode 8 &T8 Test Mode 9 &T9 Test Mode 10 Test Mode 7 is the Switch and LED operational test. By running mode, you can switch DIP-switches and verify that they work by corresponding LEDs Test Mode 8 is the Non-Volatile Memory test. check the proper operation of the MultiMuxs storage of operational parameters. This test will overwrite the stored parameters. your MultiMux in this the eight being lit. Its function is to Test Mode 9 is the Watch-Dog Timer 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. 6.2 MultiMux Operating Procedures The MultiMux operating procedures cover entering parameters for both your local and remote MultiMux units. Table 6-1. MultiMux Operating Procedures Step Procedure 1Turn power on to your MultiMux and supervisory console, type AT and then hit Return.
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 EXTERNAL 56K INTERNAL OFF Configuration of Port B: Sync Data DSU TYPE SPEED CLOCKINGLOOPBACK ANY SDLC 56K INTERNAL OFF Based on the listed composite link configuration conditions, reconfigure the parameters to the conditions required in your particular installation by entering the appropriate Internal Comp
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) position; refer to the 8-position DIP Switch in the Configuration Chapter (Chapter 3) of this manual.
DIALTONE/WINK (E&M): WINK TIMER N/A N/A REMOTE INTERFACE TYPE: GROUND/LOOP START (FXS): 2 OR 4 WIRE (E&M): DIALTONE/WINK (E&M): FXS LOOP 2 WIRE N/A DIALTONE/WINK (E&M): WINK TIMER N/A N/A REMOTE INTERFACE TYPE: FXS GROUND/LOOP START (FXS): LOOP 2 OR 4 WIRE (E&M): 2 WIRE DIALTONE/WINK (E&M): N/A Table 6-2. Voice/Fax Operating Procedures (Cont.) Step Procedure 2To reconfigure the Voice/Fax channel parameters to match your actual requirements enter commands as described in Chapter 5 of this manual.
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. There are no specific repair procedures besides command execution and switch settings that you are expected to perform in MultiMux maintenance.
7.3 TestCables 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. This cable will allow you to verify operation of all aspects of the MultiMux prior to actual installation. The second test cable is the Composite Link Loopback cable.
not communicating Console. port connection Chapter 4 not installed on Supervisory supervisory console, refer to comm software users manual forinstallation. with mux command 2. Bad cable or cable 1. Check RS232 cable connections between supervisory console and COMMAND PORT on MultiMux for loose connection or bent pins, refer to Supervisory Console Installation procedures in 2.
RD LEDs ON 2. Connect composite link cable between mux and modem. Composite link and all 1. Mux memory failure channels down with RD and all channel RCV LEDs ON parameters will be destroyed. 1. Enter ATL and record all channel parameters before running memory test. Perform memory test by entering &T2 command. All stored 2. Reconfigure all channel parameters. 3. Call Tech Support for assistance, refer to Chapter 8. Flashing RXT LED 1. High error rate on communication line 1.
Table 7-2. Voice/Fax Troubleshooting 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 on remote voice/fax remote voice/fax channel a couple voice/fax channel channel. recheck voice quality, refer to the V(1/2)IL command in Chapter 5. high on local recheck voice 2. Output level attentuation 2. Decrease output level attenuation setting on local voice/fax channel a voice/fax channel.
interface connector type. installation 3. Voice/fax ribbon cable 1. Reconnect the voice/fax ribbon cable between the voicefax and aggregate procedures in Chapter 4. not connected. board. Refer to the 2. Call Tech Support for assistance, refer to Chapter 8. 4. MV2 Board failure (test 12), refer to voice/fax channel 1. Perform the voice/fax loopback test testing procedures in this chapter. 2. Call Tech Support for assistance, refer to Chapter 8. A voice/fax channel 1.
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 properly, by echoing channel keystrokes through the MultiMux and then displaying them as correct characters on the channel devices monitor. Table 7-3.
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, the MultiMux can send data (keystrokes) from the channel device and have them echoed through the composite link, remote DSU and back to the channel devices monitor. Table 7-4.
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 described below will check the non-volatile memory used for parameter storage and internal circuitry, called the Watch-Dog circuitry, which is responsible for keeping the MultiMux functioning normally.
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 ensure that the local and remote interfaces for both channels are set up correctly. This test could isolate a voice/fax channel of a MultiMux as being defective. Table 7-6.
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. Table 7-7.
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 workmanship for a period of two, five, or ten years (depending on model) from date of purchase, or if proof of purchase is not provided, two, five, or ten years (depending on model) from date of shipment.
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 matters, product configuration, verification that the product is defective, etc., to our Technical Support department at (800) 972-2439 or email tsupport@multitech.com.
Appendix A ASCII Character Code/Hex/Decimal Conversion Chart CTRL CODE HEX DEC @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] NUL SOH STX ETX EOT ACK BEL BS HT VT ETB NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR SO SI DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Null, or all zeros Start of
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 generated by the mux are approximately 10 volts when measured across a load of 300 ohms or greater. The receiving circuits of the mux will accept signals in the 3 to 25 volt range.
Appendix C Cabling Diagrams Channel Cable DCE to Channel cabling (with EIA pass Thru) PIN NO. To MultiMux Channel Connector PIN NO. 1 1 CHASSIS GROUND (AA) 2 2 TRANSMIT DATA (BA) 3 3 RECEIVE DATA (BB) 4 4 REQUEST TO SEND (CA) 5 5 CLEAR TO SEND (CB) 6 6 DATA SET READY (CC) 7 7 SIGNAL GROUND (AB) 8 8 CARRIER DETECT (CF) 20 20 DATA TERMINAL READY (CD) 22 22 RING INDICATOR (CE) 25 25 OUT OF SERVICE/BUSY To DCE Device (Communication Device i.e.
Command Port Cables DCE to DTE cabling PIN NO. To MultiMux Command Port Connector PIN NO. 1 1 CHASSIS GROUND (AA) 2 2 TRANSMIT DATA (BA) 3 3 RECEIVE DATA (BB) 4 4 5 5 CLEAR TO SEND (CB) 6 6 DATA SET READY (CC) 7 7 SIGNAL GROUND (AB) 8 8 CARRIER DETECT (CF) 20 20 DATA TERMINAL READY (CD) 22 22 25 25 To DTE Device (Terminal Device i.e. ASCII Terminal) DCE to DCE cabling PIN NO. To MultiMux Command Port Connector PIN NO.
Composite Link Cabling RS232C/V.24 *Configured Composite Link PIN NO. To External Synchronous Modem/DSU Connector PIN NO. 1 1 CHASSIS GROUND (AA) 2 2 TRANSMIT DATA (BA) 3 3 RECEIVE DATA (BB) 4 4 REQUEST TO SEND (CA) 5 5 CLEAR TO SEND (CB) 7 7 SIGNAL GROUND (AB) 8 8 CARRIER DETECT (CF) 15 15 TRANSMIT CLOCK (DB) 17 17 RECEIVE CLOCK (DD) 20 20 DATA TERMINAL READY (CD) 25 25 To MultiMux External Modem/DSU Connector V.35 Adapter Cable Configured on a RS232C/V.
RJ48 Cabling for Internal DSU Receive { Transmit { RT RR RT RR 1 2 3 4 5 6 7 8 Back to Back Mux Cable 25-PIN CONNECTOR (FEMALE) Frame Ground Transmit Data Receive Data Request To Send Clear To Send Signal Ground Data Set Ready Carrier Detect Transmit Clock Receive Clock Data Terminal Ready 1 2 3 4 5 7 6 8 15 17 20 Internal Clock 24 “DCE” 25-PIN CONNECTOR (FEMALE) 1 3 2 5 4 7 20 Frame Ground (AA) Receive Data (BB) Transmit Data (BA) Clear To Send (CB) Request To Send (CA) Signal Ground (AB) Data T
E&M (I-V) Voice/Fax Channel Cable E&M CABLE Green-White White-Green White-Orange White-Blue Blue-White Orange-White Brown-White White-Brown RJ45 Plug 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 * Cable wire is solid 24AWG. If connecting to a punch block, spade lugs may be cut off.
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, and Bringing the Phone Line Off Hook You can make the command modem hang up go Off Hook, with the H command. Entering will bring the line Off Hook just as if you had picked up the telephone handset. The command modem remains in command mode. (go On Hook), or ATH1 (upper case) H0-1 You can hang up by entering ATH0 or ATH (remember that the default value is 0 when nothing is entered).
in the Dialing as R transmit when the command letter R is entered dialing command. When this is done, the command modem will soon as the number and then transmit a carrier signal to the other modem. a For example, entering ATD5551212R and cause the number 555-1212 to be dialed and cause the comcarrier signal at the end sequence.
13 modem during auto answer. DATA Command modem connected as data You can also choose to completely eliminate the display of all of the This is accomplished by executing the Q command. Result Codes. View Active The View Active Configuration and User Profiles &V command Configuration displays the commands and S-Register settings along with the and User Profiles stored telephone numbers.
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. The ATX4 command is the factory default setting. The Result Code Set/Call Progress X commands are summaATX0 signal) capability is provided. provided. ATX1 rized below.
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. Each comma used in a dialing command does count as one of the forty allowed characters.
Appendix E Indicators/Switches and Connectors Indicators Figure E-1. MultiMux Front Panel Table E-1. LED Indicators Indicator XMT/RCV FC Description Channel The Channel Transmit (XMT) and Receive (RCV) indicators show the activity level on each channel. MultiMux MMV1608 uses Channel One through Channel Eight indicators, MMV1616 uses Channel One through 16, MMV3224 uses Channel One through Channel 24, and finally MMV3232 uses Channel One through 32.
FCR RD 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. The Remote Down (RD) indicator lights when the local MultiMux cannot extablish communications with the remote MultiMux. The RD indicator lights for both internal DSU and an external link device.
Figure E-2. Back 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. CHANNEL 1-16, CHANNEL 1-32 Channel 1 through channel 16 or channel 1 through 32, depending on MultiMux model, are used to connect the async devices. These connectors provide the RS232C connection.
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 E&M connector is an RJ48S 8-position keyed jack.
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 Open (UP) External Link A Device Selected Internal Link A DSU Selected Switch Position 3: Closed Open (UP) External Link B Device Selected Internal Link B DSU Selected Switch Position 4: Switch Position 5: Switch Position 6: (default) Switc
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). Flow control by the mux to control data flow from a channel device is called Mux Initiated Flow Control.
In the example below, the flow control on the minicomputer works as follows: MiniComputer Channel 1 2 3 4 5 6 7 8 Data A. Flow Control B. C. off Flow Control on Data D. Link Mux mux process data to the link mux buffers full mux buffers empty mux processes data to the link A. Data volume from the mini for any particular channel is appropriate for the mux to process and transfer on to the link. B.
Printer pacing and Flow Control The example below shows how Pacing and Flow Control work on a printer. (Host) MiniComputer Channel Link MUX 1 MUX Channel 1 Print Data Pace off Printer Prints Data Print Buffer Full Pace on Printer Ready A. B. Flow Control C. D. Flow Control off off E. F. G. Flow Control on H. (Remote) Printer Flow Control on Print Data Printer Prints Data A. Print data volume from the mini is appropriate for the printer to process and print it. B.
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"): A communications code sent from a receiving modem to a transmitting modem to indicate that it is ready to accept data. It is also used to acknowledge the error-free receipt of transmitted data. Contrast with NAK.
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". Bps (bits per second): A unit to measure the speed at which data bits can be transmitted or received.
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 method of electronic information transmission common between computers and other digital devices. Analog signals are waveforms: a combination of many possible voltages.
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 short wavelength signals yield high frequencies). Full-duplex: A method of transmitting and receiving data simultaneously over a single pair of wires. Compare with Half-Duplex.
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 end. Modems can be internal and fit into an expansion slot, or external and connect to a serial port.
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. The rackmount equipment is fitted with brackets, rather than being packaged in its own enclosure. Rackmounting conserves disk or floor space (real estate) and often conserves power outlets.
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.24: The CCITT hardware interface specification for interchange circuits between the DTE and DCE. V.35: The CCITT hardware interface specification commonly used by DSU/CSUs and other high-speed devices.
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 Commands 5-17 Aggregate .............................................. 1-3 Aggregate Board ................................... 4-2 Aggregate Board Switch SW-5 ............ 3-10 Analog Loop .........................
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 ............... 4-5 COMMAND PORT TERMINAL/PC Connector 3-6 Command Summary .............................. 5-2 Communications Link ............................ 1-4 Composite Link ............. 1-2, 1-4, 1-5, 1-18 Composite Link (RS232C Interface) ....... 4-1 Composite Link (V.35 Interface) .........
...................................................... 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 .............. 3-3 Echo Command (E0-E1) ...................... 5-10 ENQ/ACK ............................................ 1-17 Enquire/Acknowledge Flow Control (F3-F4) Command 5-10 Error Correction ...................................
LED Indicators ....................................... 3-2 Limited Warranty ........................... 1-2, 8-1 Line Interface ....................................... 1-18 Link Protocol ................................ 1-3, 1-18 Link Speed .......................................... 1-18 Link Voice/Fax Communicates Over Command (V(1/2)ML) .......................... 5-21 List Channel Parameters Command (L0-L32) ...............................................
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) ...... 5-11 PBX ............................................... 1-6, 1-8 PBX E&M Trunk .................................. 2-11 PC ......................................................... 1-4 PC Board Power Cable .......................... 4-2 PDN .............................
Source Node Command (SN) .............. 5-13 Specifications ...................................... 1-17 Stat Muxes ............................................. 1-3 Statistical Multiplexers ........................... 1-3 Status Report Baud Rate (#RB) ........... 5-18 Status Report Time (#RT) .................... 5-18 STDM .................................................... 1-4 Stop Bit Command (SB1-SB2) ............. 5-13 Store New Parameters command ..........
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 ....................... 1-1, 1-8 Voice/Fax Channel Testing .................. 7-15 Voice/Fax Channel Testing Procedure . 7-15 Voice/Fax Destination Channel Command (V(1/2)DC) 5-21 Voice/Fax Destination Node command (V(1/2)DN) ...................
