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CHAPTER 4: Installation
AT&T standard modular color codes are:
4.3 Four-Wire, Multipoint Installation
Multipoint operation involves the connection of several terminals to one host port.
In such an application, one local Async/Sync Industrial Line Driver is used as a
master unit, and it is connected to several remote Async/Sync Industrial Line
Drivers that are acting as slaves.
In a multipoint environment, the master Async/Sync Industrial Line Driver
transmits continually. Initiation of two-way communication is RTS-controlled by
each slave Async/Sync Industrial Line Driver. To facilitate multipoint
communication, the master Async/Sync Industrial Line Driver should have its
carrier-control DIP switch set to Constantly ON (S1-8=OFF). Each slave Line Driver
should have its carrier-control DIP switch set to Controlled by RTS (S1-8=ON).
Figure 4-2 shows a typical Line Driver multipoint application.
Figure 4-2. Typical multipoint setup.
1 - Blue
2 - Orange
3 - Black
4 - Red
5 - Green
6 - Yellow
7 - Brown
8 - Slate
Master
unit
Slave
units
