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Appendix F - Flow Control Background
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. Such flow control might be needed if a mux was
connected to a minicomputer that could output more data than the
mux could handle. Flow control by the channel device to control data
flow from the mux is called Channel Device Initiated Pacing. Such
pacing might be required by a printer channel device which could not
print data as fast as the mux might send it or might go off-line for
some reason like running out of paper. To state it simply, “Flow
Control” is something the mux does to the channel device, while
“pacing” is something the channel device does to the mux.
DATA
DATA
CHANNEL DEVICE
INITIATED PACING
Channel
Device
Channel
Device
Mux
Mux
MUX INITIATED
FLOW CONTROL
Flow control stops the
input of data to the mux
Pacing stops the output
of data from the mux
Flow control can be software or hardware based. In software flow
control, special characters (Xon and Xoff) are used to stop and start
the flow of data. In hardware flow control the Clear To Send (CTS)
signal on the RS232C interface (pin 5) is brought low to stop data
and high to restart it. When you select a flow control method with a
mux command you are also selecting the corresponding pacing
method.
In the example below we have an eight port multi-user minicomputer
connected to a MultiMux on one end of a link and seven terminals
plus a printer connected to another MultiMux on the other end of the
link. The MultiMux at the printer end needs Flow Control and Pace
on the printer channel to stop and restart data from the
minicomputer. The MultiMux at the minicomputer end needs Flow
Control on to all channels to stop and restart data from the
- 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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