Rs-422 Output Module; Functional Overview; Functional Block Diagram - Symmetricom SSU-2000 User Manual

RS-422 Output Module

This section provides reference data for the RS-422 Output module (part number
23413287-000-0) designed for use in the SSU-2000 Synchronization Supply Unit.

Functional Overview

The RS-422 Output module generates 10 balanced square-wave outputs (TTIP and
TRING signal pairs) and 10 single-ended (Ring) square-wave outputs. Each output
can be turned off independently of other ports; relays on each output disconnect the
driver output from the output pins. A squelch feature turns off selected ports when
the input signal falls below predetermined quality levels.
You can provision the output port frequency from 8 kHz to 4096 kHz in 8 kHz
increments. The frequency selected for port 1 (balanced) is also present on port 11
(single-ended); the frequency selected for port 2 determines the frequency for port
12, and so on.
The RS-422 Output module can be used individually or it can be configured for
operation as redundant pairs in the shelf. When redundant modules are installed
and the frequency is changed on one module, the redundant module turns its output
off, changes to the new frequency and locking in phase with it, and then turns its
output on again.

Functional Block Diagram

A simplified block diagram of the RS-422 Output module is shown in
12713020-002-2 Revision F.01 – January 2007
Chapter 8 Output Module Reference Data
RS-422 Output Module
Figure
SSU-2000 User's Guide 239
8-18.