Multitech MMH900 Guide de l'utilisateur

MMH900 Series StatisticalMultiplexerUser Guide

10Chapter 1 - Introduction & Description1.3 BackgroundAny data communications environment that has more than oneasynchronous line going between co

100Chapter 6 - Operating Procedures7.4 Troubleshooting GuideThe following guide is set up as a series of possible conditions, causesand suggested fixe

101Chapter 6 - Operating ProceduresTable 7-1. Troubleshooting GuideThe following symptoms are typical of problems you might encounter:• Supervisory

102Chapter 6 - Operating ProceduresSupervisory Console not communicating with mux commandportProblem Communications softwarenot installed onSuperviso

103Chapter 6 - Operating ProceduresComposite link down with CTS, XMT and REMOTE DWN LEDsONProblem Composite Link cablingSolution 1. If internal compos

104Chapter 6 - Operating ProceduresComposite link down with CO CTS and REMOTE DWN LEDsONProblem External modem settings on remote muxSolution 1. Verif

105Chapter 7 - Troubleshooting ProceduresProblem Channel devices incorrectly cabledSolution 1. Refer to cabling diagrams of both mux andchannel device

106Chapter 7 - Troubleshooting Procedures7.5 Channel Device TestingThe first step in system testing is to check the operation of themultiplexer networ

107Chapter 7 - Troubleshooting Procedures7.6 Local Modem and Communications LineTestingAfter determining that the channel-device-to-MultiMux portion o

108Chapter 7 - Troubleshooting Procedures3 Place your local MultiMux in normal operating mode by shuttingpower off and turning it back on. Make sure y

109Chapter 7 - Troubleshooting Procedures7.7 MultiMux Functional Testing ProceduresThere are tests available on the MultiMux which check various funct

11Chapter 1 - Introduction & Descriptionon one end of the link and then broken up into individual components onthe other end. Someone wishing to

110Chapter 7 - Troubleshooting Procedures5 To check the Watch-Dog circuitry, place the local MultiMux unit inTest Mode 9 (i.e., executing the Watch-Do

Chapter 8- Service, Warranty, &Technical Support

112Chapter 8 - Service, Warranty, & Technical Support8.1 IntroductionThis chapter starts out with statements about your MultiMux 2-yearwarranty. T

113Chapter 8 - Service, Warranty, & Technical Support8.3 Repair Procedures for U.S. and CanadianCustomersIn the event that service is required, pr

114Chapter 7 - Troubleshooting Procedures8.4 Repair Procedures for InternationalCustomers (Outside U.S.A. and Canada)Your original point of purchase R

115Chapter 7 - Troubleshooting Procedures8.5 Repair Procedures for InternationalDistributorsProcedures for International Distributors of Multi-Tech pr

Appendices

117Appendix A - ASCII Character/Code/Hex/Decimal Conversion ChartAppendix AASCII Character Code/Hex/Decimal ConversionChartCTRL CODE HEX DEC CODE HEX

118Appendix B - RS232C Interface SpecificationsAppendix BRS232C Interface SpecificationThe MultiMux RS232C interface circuits have been designed to me

119Appendix B - RS232C Interface SpecificationsThe computer or terminal should be supplied with a cable terminatedwith a Cinch DB25P (or equivalent) c

12Chapter 1 - Introduction & Description1.3.1.2 CommunicationsThe basic functions of multiplexing are to make communications moreefficient, to pro

120Appendix C - Cabling DiagramsAppendix CCabling DiagramsChannel CablesDCE to Channel cabling (with EIA pass Thru)PIN NO.1234567820222512345678202225

121Appendix C - Cabling DiagramsCommand Port CablesDCE to DCE cablingPIN NO.1234567820222512345678202225ToMultiMuxCommandPortConnectorToDCEDevice(Comm

122Appendix C - Cabling DiagramsPIN NO.123457815172025123457815172025ToExternalSynchronousModem/DSUConnectorToMultiMuxExternalModem/DSUConnectorCHASSI

123Appendix C - Cabling DiagramsRJ45 Cabling for Internal DSU1 2 3 4 5 6 7 8{{ReceiveTransmitRTRRTTTRBack to Back Mux Cable*25-PIN CONNECTOR (F

124Appendix D - Command Modem CommandsAppendix DCommand Modem CommandsCommand DescriptionA AnswerThe Answer Mode forces the command modem intoanswer m

125Appendix D - Command Modem Commandsfollowing it. For example, if you enter ATD5551212and hit Return, the command modem will dial thenumber 555-1212

126Appendix D - Command Modem Commands&F Load Command Modem Factory DefaultsThe Load Command Modem Factory Default &FCommand resets the S-Reg

127Appendix D - Command Modem Commandscommand. This “read” command enables thesoftware to determine the type of modem with whichit is communicating.Wh

128Appendix D - Command Modem Commandsfor your dialing.An example of combining pulse and tone dialingcould involve a PBX system where 9 had to bepulse

129Appendix D - Command Modem CommandsSN=xxx S-Register Read or WriteThe S command can be used to both assign a valueto or read the current value of a

13Chapter 1 - Introduction & Description1.4 Product DescriptionThere are two basic models of MultiMux MMH900 series available: afour channel and

130Appendix D - Command Modem CommandsVo-1 Result Codes Word or DigitThe command modem can display its Result Codeson your supervisory console. These

131Appendix D - Command Modem CommandsYou can also choose to completely eliminate the display of all of theResult Codes. This is accomplished by execu

132Appendix D - Command Modem CommandsW Wait for Dial ToneThe W command causes the command modem towait up to a specified time for the dial tone to oc

133Appendix D - Command Modem Commandsdialing where actual dial tones are not detected,instead the command modem relies on timedpauses. The ATX0 enabl

134Appendix D - Command Modem CommandsATX3 Blind dialing is enabled along with extendedresult codes. Busy result code is enabled if thebusy signal is

135Appendix D - Command Modem Commandsspecified by the number preceding the delimiter.Thefollowing characters are allowed to be stored: 0through 9, A

136Appendix D - Command Modem Commandslength of the pause of the comma, from two secondsto any other value from 0 up to 255 seconds. This isaccomplish

137Appendix E - Command Modem S-Register FunctionsAppendix E Command Modem S-Register FunctionS0Number of Rings Until Modem AnswersUnit: 1 ringRange:

138Appendix E - Command Modem S-Register FunctionsS3Return CharacterUnit: ASCII CharacterRange: 0-127Default: 13Description: Defines the character rec

139Appendix E - Command Modem S-Register Functionsthe telephone line. the minimum time is two seconds(Decimal 2) and is the factory default setting. V

14Chapter 1 - Introduction & Descriptionchannel devices and the composite link. The async devices areconnected to CHANNEL 1 through CHANNEL 4 conn

140Appendix E - Command Modem S-Register FunctionsS10Carrier Loss Disconnect Delay TimeUnit: 100 mSec.Range: 1-255Default: 7Description: Sets the time

141Appendix E - Command Modem S-Register FunctionsS19Not UsedS20Not UsedS21ReservedS22ReservedS23ReservedS24Sleep Mode Inactivity TimerUnit: Sec.Range

142Appendix F - Flow Control BackgroundAppendix FFlow Control BackgroundFlow control refers to the techniques used by computer devices andmultiplexers

143Appendix F - Flow Control Backgroundminicomputer so that the mux’s buffer capacity is not exceeded. Wechose Xon/Xoff flow control for this example

144Appendix D - Command Modem Commandsso the mux sends a start data Flow Control (ON) signal to the mini.D. Data from the mini again flows through the

145Appendix G - MMH2834 S-RegistersAppendix GMMH2834 S-RegistersIntroductionThis section covers the MMH2834 memory (option) registers called S-Registe

146Appendix G - MMH2834 S-RegistersS8Pause Time for CommaUnit: 1 secondRange: 0-255, 4-255**, 4-7***Default: 2, 4**, 4***Description: S8 sets the leng

147Appendix G - MMH2834 S-RegistersS13Remote Configuration Escape CharacterUnit: ASCII CharacterRange: 0-127Default: 37 (%)Description: S13 defines th

148Appendix H - Dial Back-upAppendix HDial Back-upThe dialing associated with the MMH2834, when in leased line with dial-back mode, involves placing a

149Appendix I - Testing Your MMH 2834Appendix ITesting Your MMH2834I.1 IntroductionEach time power is applied to a MultiMux with an internal MMH283

15Chapter 1 - Introduction & DescriptionThe composite link has to be configured for its parameters before datacan be transferred.The composite lin

150Appendix I - Testing Your MMH 2834I.2 Local Analog Loopback Test/V.54 Loop 3In this test, data from your computer or terminal is sent to your

151Appendix I - Testing Your MMH 2834I.3 Digital Loopback Test/V.54 Loop 2 (Loc/Man)In this test, your modem must be On-Line with another modem that

152Appendix I - Testing Your MMH 2834maintaining the pseudo On-line mode with the remote modem.4. Type ATU3 from the local PC and hit ENTER. Once you

153Appendix I - Testing Your MMH 2834I.4 Digital Loopback Test/V.54 Loop (Rem/Auto)In this test, your modem must be On-line with another modem set

154Appendix I - Testing Your MMH 28344. Type ATU2 and hit ENTER. The local modem responds to thiscommand by transmitting an unscrambled marking signa

155Appendix I - Testing Your MMH 2834I.5 Synchronous Mode TestingThe following tests must be run with your modem in Synchronous mode.The test proced

156Appendix G - MMH2834 S-RegistersI.6 Local Analog Loopback Test (Sync Mode)This test diagnoses the connection between your MMH2834 and yourcomputer

157Appendix I - Testing Your MMH 2834I.7 Digital Loopback Test (Loc/Man) Sync ModeThis test must be run when you have a data connection with another

158Appendix I - Testing Your MMH 2834I.8 Digital Loopback Test (Rem/Auto)(SyncMode)This test must be run when you have a data connection with anothe

159Appendix J - Internal MMH2834 Composite Link Modem CommandsAppendix J - Internal MMH2834 Composite LinkModem CommandsJ.1 IntroductionBefore the int

16Chapter 1 - Introduction & Description1.5 System Features1.5.1 Response Time ControlResponse time control is the technique used by a mux to make

160Appendix J - Internal MMH2834 Composite Link Modem CommandsMMH2834 Modem Q Result Codes Enable/Disable ResponseConfigure &Q Result Code Selecti

161Appendix J - Internal MMH2834 Composite Link Modem CommandsMMH2834 Modem Sr? Read Current S-Register ValueRead and Sr= Assign S-Regis

162Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.1 Dialing Action CommandsDial The letter D in a command causes the MMH2834 to dial t

163Appendix J - Internal MMH2834 Composite Link Modem CommandsRETURN. Do not include the letter D in this command, or thestored number will be erased

164Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.2 Dial Modifier CommandsPulse or Tone Dial The MMH2834 dials numbers using either pu

165Appendix J - Internal MMH2834 Composite Link Modem CommandsLong Space When two modems are connected in Normal mode (i.e.Disconnect withouterror cor

166Appendix I - Testing Your MMH 2834message. Hitting any key also aborts the $ command.The following is an example of this command:ATDT10288061278

167Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.3 Phone Number Memory CommandsStoring Phone A telephone number and command line of u

168Appendix J - Internal MMH2834 Composite Link Modem Commands L shown below. All digits and command letters will be shown. Thenumber’s “n

169Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.4 Configuration and Default Storage CommandsStore Configuration The MMH2834 can stor

17Chapter 1 - Introduction & Description1.5.3 Flow ControlFlow control regulates the volume of data entering the buffers. When aparticular channel

170Appendix J - Internal MMH2834 Composite Link Modem CommandsAsync/Sync This command can be used to set the on-line mode to eitherMode synchronous or

171Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.5 Command Response (Result Code)CommandsEcho Command If the MMH2834 is connected to

172Appendix J - Internal MMH2834 Composite Link Modem Commands12 CONNECT 960013 CONNECT 1440019 CONNECT 1920021 CONNECT 2160024 CONNECT 2400026 CONNEC

173Appendix J - Internal MMH2834 Composite Link Modem CommandsCall Progress combinations related to these methods. You can choose toSelection have ce

174Appendix J - Internal MMH2834 Composite Link Modem CommandsFive different X commands are available (X0 through X4), withfive different effects on t

175Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.6 Phone Line Conditioning CommandsEnable or Disable The MMH2834 has several self-te

176Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.7 RS232C Interface Control CommandsData Terminal Data Terminal Ready (DTR) on pin 20

177Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.8 Error Correction CommandsYou can use AT commands to place your MMH2834 one of thre

178Appendix J - Internal MMH2834 Composite Link Modem CommandsEnable/Disable In Auto-Reliable mode, the modem is given four seconds toAuto-Reliable es

179Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.9Compression and Maximum Block Size CommandsData Compression The data compression (&

18Chapter 1 - Introduction & Description1.5.6 Operational Statistics and Auto-ReportingOperational statistics provides the activity report for the

180Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.10 Speed Conversion CommandsSpeed conversion is a necessary part of data compression

181Appendix J - Internal MMH2834 Composite Link Modem CommandsSerial Port Baud The $SB command presets the speed of the MMH2834's serialRate (RS2

182Appendix J - Internal MMH2834 Composite Link Modem CommandsJ.1.11Immediate Action CommandsHelp Screens The Help command is designed to give you sho

183Appendix J - Internal MMH2834 Composite Link Modem Commandscurrent on-line condition (e.g., Link Type, Line Speed, SerialSpeed, Type of Error Corre

Glossary

Glossary185AAC (Alternating Current): A power sourcewhose signal crosses a reference voltage(usually called ground or zero). Alternatingbetween a ma

Glossary186BBaud: Baud is rate, the signalling rate of aline, the switching speed, or the number oftransitions (voltage or frequency changes)that are

Glossary187Circuit switching: The temporary connec-tion of two or more communications channelsusing a fixed, non-shareable path through thenetwork.

Glossary188DTMF (Dual-Tone MultiFrequency): Ageneric push-button concept made popular byAT&T TouchTone.Decibel (dB): A unit of measurement forsi

Glossary189of a graphical document and, therefore,cannot be accurately interpreted according toany character code.Firmware: A category of memory chip

19Chapter 1 - Introduction & Description1.5.10 Composite LinkThe composite link of the MultiMux is capable of synchronous,asynchronous and digital

Glossary190Mid-range computer: A term coined by IBMreferring to any of their Advanced BusinessSystems computers. This product line wasoriginally cal

Glossary191Phase: The timing of a signal based uponthe starting point of each cycle in anothersignal. To be detected phase requires thecomparing of

Glossary192a conversion chip called a "UART" whichtranslates between internal parallel andexternal serial formats.Switched Line: In communi

Glossary193XYZ

194IndexIndexSymbols&T command, 15414.4, 9.6, 48, 24 Composite LinkSpeed Indicators, 3756, 19.2 Composite Link SpeedIndicators, 38AAbort TimerS7,

195IndexCommand Port Cables, 122COMMAND PORT Connec-tor, 15, 40Command Sum-mary, 53, 54, 55, 56, 57Communications, 13Composite Link, 13, 20Composite L

196Indexesult Codes (Basic Extended)and Call Progress (, 173Extended Result Codes, 175EXTERNAL COMPOSITE LINKRS232C/V.35 Connector, 16FFacility Inter

197IndexLocal Modem and CommunicationsLine Testing, 108Long Space Disconnect (Y), 166MMaximum Speed, 24Memory Test Command (&T1-T2), 87MiniCompute

198IndexResponse Time Control, 17Response Time Priority Command(R0-R3), 70Result Codes Enable/Disable and NoResponse (Q), 172Retransmit Count ($R), 17

199IndexUniversal Channel Parameters (C0)Command, 65Unpacking, 46VV.35 indicator, 36V29/V33 Indicator, 39WWait for New-Dial-Tone (W), 166Wait Time for

User GuideS000315A Revision AMultiMux (#MMH904Ca) (#MMH908Ca)This publication may not be reproduced, in whole or in part, without priorexpressed writt

20Chapter 1 - Introduction & Description1.6 FCC Regulations for Telephone LineInterconnection1. This equipment complies with Part 68 of the FCC ru

S000315A

21Chapter 1 - Introduction & Description8. This equipment cannot be used on public coin service provided bythe telephone company. Connection to Pa

22Chapter 1 - Introduction & Description1.7 DOC Terminal EquipmentNotice: The Canadian Department of Communications label identifiescertificated e

23Chapter 1 - Introduction & Description1.8 Specifications1.8.1 ChannelsNumber of Channels Up to four (#MMH904), or up to eight(#MMH908)Maximum S

24Chapter 1 - Introduction & DescriptionDiagnostics Memory test, Analog Loop, Digital Loop,Remote Analog Loop, Switch test, LED test,Non-Volatile

25Chapter 1 - Introduction & Description1.8.6 ISDN Terminal AdapterDescription Integral ISDN terminal adapter cardOperating Mode ISDN Basic Rate;

Chapter 2 - Configuration

27Chapter 2 - Configuration2.1 IntroductionThe MultiMux MMH900 Series is available in two models; the four andeight channel units with an internal com

28Chapter 2 - Configuration2.2 Configuration 1Configuration 1 is two Multi-Tech MultiMux MMH904Ca/144 which arefour channel multiplexers with internal

29Chapter 2 - ConfigurationLocal Channel ParameterSTP FLOW ENQ/ PASS PASSCHN SPD WORD BIT PARITY CONTROL ACK ECHO PACE EIA XON01 19200 8 1 NONE X

ContentsChapter 1 - Introduction & Description ... 81.1 Introduction ...

30Chapter 2 - Configuration2.3 Configuration 2Configuration 2 is two MultiMux MMH904Ca four channel multiplexerswith two external Multi-Tech MultiMode

31Chapter 2 - Configuration2.4 Configuration 3Configuration 3 is two MultiMux MMH908Ca/56 eight channelmultiplexers connecting a minicomputer at the l

32Chapter 2 - ConfigurationConfiguration 3 Composite Link ConfigurationLocal Channel ParameterSTP FLOW ENQ/ PASS PASSCHN SPD WORD BIT PARITY CONTROL A

Chapter 3 - Front & Rear PanelDescriptions

34Chapter 3 - Front & Rear Panel Descritpions3.1 IntroductionThis chapter describes all of the front panel LEDs, switches, jumpersand the shunt on

35Chapter 3 - Front & Rear Panel Descritpions3.3 LED IndicatorsCommand ModemIndicator DescriptionCD Indicates the local command modem has detecte

36Chapter 3 - Front & Rear Panel DescritpionsChannelIndicator DescriptionChannel 1-8 The Channel Receive (RCV) and Transmit RCV/XMT(XMT)indicator

37Chapter 3 - Front & Rear Panel DescritpionsInternal Composite Link (DSU)Indicator DescriptionCD The Carrier Detect (CD) indicator lights when t

38Chapter 3 - Front & Rear Panel DescritpionsRCV The Receive (RCV) indicator flashes as data isbeing received by an internal composite link 9600 o

39Chapter 3 - Front & Rear Panel Descritpions3.4 Back PanelThe cable connections for the MultiMux are made at the back panel.Refer to Chapter 4 fo

Chapter 3 - Front & Rear Panel Descriptions... 343.1 Introduction ...

40Chapter 3 - Front & Rear Panel Descritpions3.4.6 COMPOSITE LINK INTERNAL MODEMLEASED ConnectorThis connector is used when the MultiMux MMH900 se

41Chapter 3 - Front & Rear Panel Descritpions3.5 Switches/Jumper/ShuntSwitch settings can be changed by taking off the front panel. To changethe

42Chapter 3 - Front & Rear Panel DescritpionsWith an MMH904 UnitC = Closed O = Open (Up)Channel # 1-4 5-8 9-12 13-16 17-20 21-24 25-28 29-32Switc

43Chapter 3 - Front & Rear Panel Descritpions3.5.3 144RKWL/OtherJumperThe 144 RKWL/OTHER jumper is positioned in the 144RKWL (Rockwell)position wh

Chapter 4- Installation

45Chapter 4 - Installation4.1 IntroductionThis chapter explains how to unpack and install your MultiMux cabinet.4.2 Safety Warnings1. Never install te

46Chapter 4 - Installation4.4 InstallationTable 4-1. Installation ProcedureComposite Link Installation1 MultiMux has an internal link modem and are co

47Chapter 4 - InstallationExternal modem with V.35 interface is being connected: Removethe top cover and move the V.24/V.35 shunt from the V.24 positi

48Chapter 4 - InstallationSupervisory Console5 If you are connecting a supervisory console to the MultiMux, connecta terminal or PC to the COMMAND POR

49Chapter 4 - InstallationChannel8 Route and connect your channel devices to the MultiMux back panelCHANNEL 1 - CHANNEL 4 on a MultiMux MMH904 or CHAN

5.2.7 Internal Composite Link DSU Commands ... 865.2.8 Test Commands ...

50Chapter 4 - InstallationAs you change operational parameters, they will not actually beincorporated into your running system until you execute a Sto

Chapter 5 - Commands

52Chapter 4 - Installation5.1 IntroductionThis chapter presents a command summary followed by a detaileddescription of each command used in the MultiM

53Chapter 5 - CommandsTable 5-1. Command Summary (cont.)TYPE COMMAND DESCRIPTIONChannel B0 Channel Off CommandParameter Bxxx Baud Rate SelectC0 Unive

54Chapter 5 - CommandsTable 5-1. Command Summary (cont.)TYPE COMMAND DESCRIPTIONChannel R0-3 Response Time PriorityParameter SB1 Stop Bit 1SB1.5 Stop

55Chapter 5 - CommandsTable 5-1. Command Summary (cont.)TYPE COMMAND DESCRIPTIONInternal 9600/14.4K Composite Link Modem$MC Modem Configuration Selec

56Chapter 5 - CommandsTable 5-1. Command Summary (cont.)TYPE COMMAND DESCRIPTIONCommandModem #MA Command Modem Select#RA Remote Command ModemAccess

57Chapter 5 - Commands5.2 Command DescriptionThe following command descriptions explain the effect that executingeach command has on your MultiMux net

58Chapter 5 - CommandsThe H command menu is as follows:General Help- Each command line must begin with the prefix AT.- Each command line may contain a

59Chapter 5 - CommandsThe H1 Menu is as follows:CHANNEL PARAMETER COMMANDSB BAUD RATE SELECTIONP PARITY SELECTIONC CHANNEL SELECTIONR RESPONSE TIME PR

Appendix C... 121Cabling Diagrams...

60Chapter 5 - Commands The H2 Menu is as follows:MULTIMUX Eight Position DIP-Switch Definitions and SettingsSwitch 1 Switch 2 Switch 3 Switch 4 Switch

61Chapter 5 - CommandsThe H3 Mend is as follows:COMPOSITE LINK FORMAT COMMANDS#EOFR - SELECTS RECEIVE END OF FRAME CHARACTER FORASYNC LINK.#EOFT - SE

62Chapter 5 - Commands#S STATUS REPORTING#S9 STATUS OF FRONT PANEL LEDSFor HELP on a specific command, enter “ATH” followed by a commandletter.The H5

63Chapter 5 - CommandsThe H7 Menu is as follws:INTERNAL DSU COMMANDS#DSUCL SELECTS CLOCKING FOR INTERNAL DSU.#DSUSP SELECTS SPEED FOR INTERNAL DSU.For

64Chapter 5 - Commands5.2.2 Channel Parameter CommandsCommand DescriptionBO Channel Off CommandThe channel off command turns the selectedchannel off.

65Chapter 5 - Commandscommunicate with one other channel. On multinodenetworks, this command must be entered at bothchannel locations specifying each

66Chapter 5 - Commandskeep up with the volume of data sent to it. There aretwo types of flow control available on the MultiMux.The software based Xon/

67Chapter 5 - Commandschannels to receive EIA control signals through theMultiMux. Since in normal interactive operations, theexistence of a multiplex

68Chapter 5 - CommandsF-11-F12 Inverted DTRThe Inverted DTR Commands (F11 and F12) workin conjunction with Pacing Control and change theway the MultiM

69Chapter 5 - Commandsconsole as shown in the following example. Todisplay the parameters for an individual channel, saychannel three, you would ente

Chapter 1 - Introduction &Description

70Chapter 5 - Commandsuse an R0 setting. If the mux is configured mainlyfor interactive users, R0 is the best setting.SB1,SB1.5, SB2 Stop BitsThe Sto

71Chapter 5 - Commands&F Load Factory ParametersThe factory default command resets the MultiMuxparameters to their original factory settings. They

72Chapter 5 - Commands#S1-S8 Channel StatusThe Channel Status command displays theindividual channel percentage activity levels andsignal pin status.

73Chapter 5 - Commands5.2.3 Composite Link CommandsThe Composite Link commands perform the function of a systemmonitor. In addition to displaying the

74Chapter 5 - Commands10 msec and #FT1 sets the flush time value to 20msec. The default is #FT0.$L List Composite Link ConfigurationThe List Composite

75Chapter 5 - Commandsconditions that affect the link's operation, such asthe downline load, modem type, flush timer valueand the response time s

76Chapter 5 - Commands#S0 Composite Link Status ReportThis command generates a status message fordisplay on the system supervisor console display.The

77Chapter 5 - Commands5.2.4 Composite Link Format Commands #EOFR Receive End Of Frame CharacterThe Receive End Of Frame character lets theMultiMux acc

78Chapter 5 - Commands$MUXSP 2400 $MUXSP 4800$MUXSP 7200 $MUXSP 9600$MUXSP 14400 $MUXSP 19200$MUXSP 38400 $MUXSP 57600$MUXSP 64000 $MUXSP 76800$MUXSP

79Chapter 5 - CommandsThe #CLA0 disables access from the command portto the composite link. The default condition is noaccess to the composite link t

8Chapter 1 - Introduction & Description1.1 IntroductionCongratulations! Your new MultiMux MMH900 series is one of the fineststatistical multiplexe

80Chapter 5 - Commands5.2.5 Internal 9600/14.4K Composite LinkModem CommandsCommand Description $MC Modem ConfigurationSelectThis command configures

81Chapter 5 - Commands$LA0: Off (default)$LA1: Japan Level$LA2: U.S. Level$LD0-2 Link DelayThis command enables cable equalization thatcompensates f

82Chapter 5 - CommandsThe Receive Level settings are as follows:$RL0: -43 dbm (default)$RL1: -26 dbm$TL0-7 TransmitThe Transmit Level Command selects

83Chapter 5 - Commands5.2.6 Internal MMH2834 Modem ConfigurationCommandsThe internal MMH2834 modem configuration commands configure thecomposite link

84Chapter 5 - Commands$M, #M Internal MMH2834 Modem Lease LIne Answer/Originate ModeThe Answer/Originate Mode $M (Answer/Originate)command sets the le

85Chapter 5 - Commands5.2.7 Internal Composite Link DSUCommandsCommand Description $DSUCL DSU ClockThe DSU Clock command allows the internal DSUto acc

86Chapter 5 - Commands5.2.8 Test CommandsCommand Description&T1-2 MemoryTestThere are two memory tests available on theMultiMux. The first test (&

87Chapter 5 - Commands&T6 Test Mode 6Test Mode 6 is the Remote Analog Loop test whichcauses any data from the composite link to beechoed through j

88Chapter 5 - Commands5.2.9 Command Modem commandsThe command modem select and remote access commands aredescribed in this section. Additional comman

Chapter 6- OperatingProcedures

9Chapter 1 - Introduction & DescriptionChapter 3 - Front and Rear Panel DescriptionsChapter 3 describes the front panel indicators, the switches a

90Chapter 5 - Commands6.1 IntroductionThe following procedures assume that your MultiMuxes (local andremote) have been installed properly and the appr

91Chapter 5 - CommandsTable 6-1. MultiMux Operating Procedures (cont.)Source Node #01 Destination Node #02Local Channel ParameterSTP FLOW ENQ/ PASS

92Chapter 5 - CommandsThe following will be displayed on your system monitor if your MultiMux is configured with an internal composite link DSU:LINK

93Chapter 5 - Commands7 To reconfigure a channel based on your actual channelrequirements, enter commands as described in Chapter 5 orAppendix D of th

94Chapter 5 - Commands6.3 Command Modem Operating ProceduresA wide variety of autodial operations and modem options can becontrolled when the command

95Chapter 5 - Commandsdialing commands.For example, enter the following to dial a phone number (555-1212)through a switchboard.ATD9,5551212 (hit Retur

Chapter 7 - Troubleshooting

97Chapter 6 - Operating Procedures7.1 IntroductionThe MultiMux is designed to make it easy to operate and maintain. Theprocedures in this chapter will

98Chapter 6 - Operating Proceduresretransmits needed to get the data through can indicate a line problem.Comparing the blocks received and receive blo

99Chapter 6 - Operating ProceduresIf you have any problems in performing these procedures, contact theTech Support department for assistance, refer to