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177
Appendix J - Internal MMH2834 Composite Link Modem Commands
J.1.8 Error Correction Commands
You can use AT commands to place your MMH2834 one of three V.42 (error
correction) modes of operation.
V.42 Mode Select The V.42 standard implements both MNP Class 3 & 4 and LAP-M
error correction methods. The V.42 Mode Select command (#L)
#L selects which type of error correction (MNP or LAP-M) your
MMH2834 uses for transmissions.
The various #L command options are as follows.
#L0 Command The #L0 Command allows a pair of modems to negotiate which
V.42 mode (MNP or LAP-M) will be used in their transmissions.
Originate Mode
a. If both modems have LAP-M capability, the modems use
LAP-M mode.
b. If one or both modems do not have LAP-M capability and both
have MNP, the modems use the MNP mode.
Answer Mode
a. The answering modem responds to either an MNP Link
Request or LAP-M Originator Detection Pattern (ODP) signal
depending on which the originating modem issues.
#L1 Command The #L1 Command sets your modem to MNP error correction
and disables LAP-M. This command is for Originate mode only.
In Answer mode, the modem still accepts MNP or LAP-M.
#L2 Command The #L2 Command sets your modem to LAP-M error correction,
and disables MNP. This command is for Originate mode only.
Answer mode still accepts MNP or LAP-M.
#L3 Command In the prior commands, the modems use a two phase process
to establish a V.42 connection (detection to establish whether
the remote modem is also error correcting, and then protocol
establishment to determine parameters and to establish the
error correction connection). If you know that the other modem
is a V.42 error correcting modem, and you wish to use LAP-M,
the #L3 command disables the detection phase and goes
directly to protocol establishment. Both modems must have #L3
in effect.
Auto-Reliable In Auto-Reliable mode, the modem is given four seconds to
Buffering establish a Reliable connection. After this four-second period,
the modem drops to Normal mode.
$A Any data which is received during this period is typically discarded.
The $A command can be used to cause the modem to buffer
(save) data that is received during this Auto-Reliable time-out
period. This data will then be output by the modem after the
CONNECT message
AT$A0 = Discard data received during auto-reliable time period.
AT$A1 = Buffer data received during auto-reliable time period.
The factory default is $A0.
- MMH900 Series Statistical 1
- Multiplexer 1
- User Guide 1
- S000315A Revision A 2
- Contents 3
- Description 7
- 1.1 Introduction 8
- 1.2 About This Manual 8
- 1.3 Background 10
- 1.3.1.2 Communications 12
- 1.4 Product Description 13
- 1.5 System Features 16
- 1.5.1 Response Time Control 16
- 1.5.2 Dynamic Buffering 16
- 1.5.3 Flow Control 17
- 1.5.4 Diagnostics 17
- Reporting 18
- 1.5.7 Parameter Memory 18
- 1.5.8 Channel Flexibility 18
- 1.5.9 Command Modem 18
- 1.5.10 Composite Link 19
- Interconnection 20
- 1.7 DOC Terminal Equipment 22
- 1.8 Specifications 23
- 1.8.1 Channels 23
- 1.8.2 System Control 23
- 1.8.3 Composite LInk 24
- 1.8.4 33,600 bps Link Modem 24
- 1.8.5 56,000 bps DSU 24
- 1.8.6 ISDN Terminal Adapter 25
- 1.8.7 Command Modem 25
- 1.8.8 Electrical/Physical 25
- Chapter 2 - Configuration 26
- 2.1 Introduction 27
- 2.2 Configuration 1 28
- 2.3 Configuration 2 30
- 2.4 Configuration 3 31
- Descriptions 33
- 3.1 Introduction 34
- 3.2 Front Panel 34
- 3.3 LED Indicators 35
- Internal Composite Link (DSU) 37
- Internal Link Device (Modems) 38
- COMPOSITE LINK 39
- 3.5 Switches/Jumper/Shunt 41
- 3.5.1 8-Position DIP Switch 41
- 3.5.2 4-Position DIP Switch 42
- 3.5.3 144RKWL/OtherJumper 43
- 3.5.4 V.24/V.35 Shunt 43
- Chapter 4- Installation 44
- 4.1 Introduction 45
- 4.2 Safety Warnings 45
- 4.3 Unpacking 45
- RS232C/V.35 46
- INTERNAL 46
- V.35 V.24 47
- Supervisory Console 48
- Channels 49
- Parameters (&W) command 50
- Chapter 4 - Installation 50
- Chapter 5 - Commands 51
- 5.1 Introduction 52
- 5.2 Command Description 57
- 5.2.1 General Commands 57
- The H1 Menu is as follows: 59
- The H2 Menu is as follows: 60
- UP = 16/32 MM 60
- DN = 900 MMH/MMV 60
- The H3 Mend is as follows: 61
- The H4 Menu is as follows: 61
- The H5 Menu is as follows: 62
- The H6 Menu is as follows: 62
- The H7 Menu is as follws: 63
- The H8 Menu is as follows: 63
- CHANNEL DEVICE 66
- INITIATED PACING 66
- MultiMux 67
- 5.2.3 Composite Link Commands 73
- LINE LOAD TYPE TIMER TIME 75
- OFF INTERNAL 10ms 3 75
- 5.2.8 Test Commands 86
- 5.2.9 Command Modem commands 88
- Chapter 6- Operating 89
- Procedures 89
- 6.1 Introduction 90
- Chapter 7 - Troubleshooting 96
- 7.1 Introduction 97
- 7.3 Test Cables 98
- Composite Link 99
- Loopback Cable 99
- 7.4 Troubleshooting Guide 100
- Channel device losing data 105
- 7.5 Channel Device Testing 106
- Procedure 107
- Technical Support 111
- 8.1 Introduction 112
- 8.2 Warranty 112
- Customers 113
- Distributors 115
- Appendices 116
- Appendix A 117
- Appendix B 118
- Appendix C - Cabling Diagrams 120
- Channel Cables 120
- Command Port Cables 121
- Appendix D 124
- Command Modem Commands 124
- Appendix F 142
- Flow Control Background 142
- MiniComputer Flow Control 143
- Appendix G 145
- MMH2834 S-Registers 145
- Appendix H 148
- Dial Back-up 148
- Appendix I 149
- Testing Your MMH2834 149
- I.1 Introduction 149
- Local MultiModem 150
- Type ATU0 or ATU1; hit ENTER 150
- Digital Analog DigitalAnalog 151
- I.5 Synchronous Mode Testing 155
- Digital Analog 156
- AnalogDigital Analog 157
- DigitalAnalogDigital Analog 158
- Modem Commands 159
- J.1 Introduction 159
- #S Change SETUP Password 161
- J.1.1 Dialing Action Commands 162
- J.1.2 Dial Modifier Commands 164
- Commands 171
- Immediate Action Commands 182
- Glossary 184
- S000315A 200
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