Multitech MMH900 Guide de l'utilisateur Page 16
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16
Chapter 1 - Introduction & Description
1.5 System Features
1.5.1 Response Time Control
Response time control is the technique used by a mux to make sure that
no user experiences undue delays in performance due to a specific
channel using too much link time. This can occur if one of the channels
is performing a high volume batch function, such as a print dump or
program transfer.
There are a variety of priority control (response time) schemes in use by
different mux vendors. Some vendors use a switch selection approach
where each channel can be given a high, medium or low setting with the
low used for those channels requiring higher volume batch transfers.
There are also software-sensing response time techniques where the
microprocessor actually monitors channel activity, and when a high
volume is sensed, that channel is given a lower priority so it will not
crowd out the others.
The MultiMux response time control method is one where data is
transferred from each channel on a timed basis while limiting the amount
sent with each transmission.
This insures that interactive users will not experience undue delays but,
on the other hand, batch activity can still be accommodated. This,
combined with a Response Time command and the ability to shut off
channels not being used, gives the MultiMux a very efficient priority
control system.
1.5.2 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.
Large buffers are unnecessary in newer designs that include
sophisticated dynamic buffer allocation techniques where the amount of
buffer per channel is assigned on an as-needed basis.
In the MultiMux, each channel is assigned 1K of buffer, but in the case
where more buffer is needed, the MultiMux will start assigning additional
buffers from the channels not requiring it. In this way a single channel
can have up to 8K of buffer if required. When dynamic buffering is
combined with efficient flow control and the automatic transmission of
data from each channel at set intervals, as in the MultiMux, very smooth
operation for each user is the result.
- 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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