Multitech MMH900 User's Guide Page 110
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- TROUBLESHOOTING
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Chapter 7 - Troubleshooting Procedures
5 To check the Watch-Dog circuitry, place the local MultiMux unit in
Test Mode 9 (i.e., executing the Watch-Dog Timer Test) by entering
the following command:
AT&T9 (hit Return)
The supervisory console will display the following message:
Watch-Dog Timer Test #9 - wait for test indicator to turn off and when
the test indicator comes back on, enter “AT” to end test.
6 As the message indicates, after the test indicator comes back on
enter the following:
AT (hit Return)
If the test passes, the following message will be displayed:
WATCH DOG TEST PASSED
- 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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