6
DATA VOICE MULTIPLEXORS
Contents
Chapter Page
1. Specifications .................................................................................................8
1.1 General (High-Level) .............................................................................8
1.2 Main Link ................................................................................................8
1.3 Data Channels .........................................................................................9
1.4 Voice Channels .....................................................................................10
1.5 General (Low-Level).............................................................................13
2. Introduction.................................................................................................14
2.1 Overview ................................................................................................14
2.2 A Typical Application ...........................................................................21
2.3 Dialup-Mode Guidelines.......................................................................23
2.3.1 Conditions for Activation/Deactivation of a Voice Channel...23
2.3.2 Conditions for Activation/Deactivation of a Data Channel.....23
2.3.3 Conditions for Activation of the Main Link..............................24
2.3.4 Conditions for Disconnection of the Main Link.......................24
2.3.5 Dialup Modem Settings ..............................................................25
2.3.6 Control over the Main-Link Modems........................................26
2.4 System-Bandwidth Utilization ..............................................................27
2.5 System-Timing Considerations.............................................................29
3. Installation....................................................................................................30
3.1 Unpacking the DVM.............................................................................30
3.2 Site Requirements.................................................................................31
3.3 Configuration........................................................................................32
3.3.1 Opening the DVM’s Case ...........................................................33
3.3.2 The Main-Board Jumpers ...........................................................34
3.3.3 The Controls on the Voice-Channel Module............................37
3.3.4 When You’re Finished ................................................................40
3.4 Making Cable Connections ..................................................................41
3.4.1 Grounding...................................................................................41
3.4.2 Power Connections .....................................................................42
3.4.3 The Main Link Connection........................................................42
3.4.4 Data-Channel Connections ........................................................43
3.4.5 Voice-Channel Connections.......................................................43
4. Operation .....................................................................................................44
4.1 The Front-Panel Indicators and Controls ...........................................44
4.1.1 Special Diagnostic Indications ...................................................46
4.1.2 Configuration-Error Indication .................................................46
