Input Module Reference Data
1-Port and 3-Port E1 Input Modules
144 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
1-Port and 3-Port E1 Input Modules
This section describes the 1-Port (part number 23413014-001-0) and 3-Port (part
number 23413014-002-0) E1 Input modules that may be installed in an SSU-2000
or SDU-2000 shelf.
Functional Overview
The 1-Port and 3-Port E1 Input modules receive signals and perform phase
measurement comparisons with the Clock modules that are installed in the
SSU-2000. The Clock modules use this information to phase and frequency lock to
the incoming signal. The data may also be used for monitoring the frequency of
incoming signals.
The modules accept either one or three of the following signals: sine or square
wave with a frequency of 1, 1.544, 2.048, 5 or 10 MHz; or framed communication
type E1. If the input signal is a communications type, the module monitors for Alarm
Indication Signaling (AIS), Bipolar Violation (BPV), Loss of Signal (LOS) and Out Of
Frame (OOF) errors. In addition, the module extracts Synchronization Status
Messages (SSMs) from the incoming framed signals.
The E1 Input module receives signals and performs phase measurement
comparisons (at a sampling rate of 40 Hz) with the Clock modules that are installed
in the SSU-2000. The Clock modules use this information to phase lock to the
incoming signal. The data may also be used for monitoring the frequency of
incoming signals.
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