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Installing and Operating AN/DC and ANH-8/DC Systems
C-8
312410-A Rev 00
Synchronous Interfaces
The AN/DC and ANH-8/DC support two synchronous interfaces, labeled COM1
and COM2. Systems with a Third Synchronous Interface or ISDN BRI upgrade
module support a third synchronous port.
The synchronous interfaces provide multiprotocol WAN connection through
DB-44 receptacle connectors. Each synchronous interface can operate
independently with RS-232, RS-422, V.35, and X.21 electrical interfaces at
transmission rates from 1200 b/s to 2.048 Mb/s. When used with standard keyed
cables, the ports automatically configure to the desired electrical interface.
You can use the following cables, described in the Cable Guide for Routers and
BNX Platforms:
• V.35 connections -- Order No. 7220
• X.21 connections -- Order No. 7224
• RS-422 connections -- Order No. 7318
• RS-232 connections -- Order No. 7826
Table C-5
shows the signal and pin assignments for these connectors.