AT&T 555-230-894 manual Installation

Install Customer-Provided Terminal Using

Asynchronous Data Unit (ADU)

Figure Notes:

1.	Processor Data Module PDM)	8.	Patch cord or jumpers
2.	Information outlet	9.	Blue or white field
3.	Satellite site, or adapter location	10.	Four pair line cord
4.	Station side	11.	Four pair line cord
5.	Switch side	12.	Part of Cross-connect field
6.	Digital Line Circuit Pack (TN754)	■	Other data-line circuit packs may be
7.	Purple field		used in some countries.

Figure 9-32. Connections to Asynchronous Data Unit (ADU) for

Data Terminal Equipment (DTE)

Install Customer-Provided Terminal

Using Asynchronous Data Unit (ADU)

Requirements

The interface between the switch and the customer’s data terminals and host computer can be through Processor Data Modules (PDMs). Refer to section on installing Processor Data Modules (PDMs) for details.

Asynchronous data terminals, however, can be connected through a Z3A Asynchronous Data Unit (ADU) to a TN726B data line circuit pack (Figure 9-32).Normally, the data unit is powered from the connected data terminal. The data unit can also be remotely or locally powered using a 2012D transformer equipped with a 248B adapter. Data units connected to receive-only printers always require external power. The need for external power must be determined experimentally for data units connected to other devices. For more information on data unit installation, refer to the Z3A Asynchronous Data Unit User’s Manual, 555-401-701.

Installation

1.Determine data unit port assignment from Data Module Form:

EXAMPLE: Port Number	2	B	02	01
	Cabinet	Carrier	Slot	Circuit

2. Connect the RS-232 plug on the data unit to the data terminal.

Issue 1 September 1995 9-61