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DEFINITYEnterpriseCommunicationsServerandSystem75andSystem85
Terminals and Adjuncts Reference
555-015-201
Issue 11
December 1999
Data Modules
21-82The Asynchronous Data Unit (ADU)
21
The Asynchronous Data Unit (ADU)
Figure 21-25. The Z3A Asynchronous Data Unit
The Z3A ADU is a small DCE-type limited-distance modem that allows direct
connection between RS-232 equipment and the system digital switch.The Z3A
ADU is a small DCE-type limited-distance modem that allows direct connection
between RS-232 equipment and the system digital switch. Used in conjunction
with the Data Line circuit pack (System 75 or a DEFINITY Communications
System Generic 1 and Generic 2) or the EIA Port circuit pack (System 85), the
ADU completes the direct link between the system switch and EIA terminals,
printers, and host computer ports. In these applications, DTE devices can access
the switch without using a separate data module or modem. The ADU is installed
at the device end of the EIA connection. ADUs can also be hard-wired in pairs
with other ADUs to interface data terminals directly to a host computer. This
application is typical when access to the host is not made through the system.
RS-232C Connector
Telephone Jack
Wall Jack
Optional
Originate/
Disconnect
Switch
Interface