Chapter 7 Input Module Reference Data
1-Port and 3-Port E1 Input Modules
164 SSU-2000e User’s Guide 12713140-002-2 Revision E – October 2006
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-2000e
system.
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-2000e. 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 input ports accept one (1-Port Input module), or three (3-Port Input modules) 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 data.
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-2000e. 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.
Functional Block Diagram
A simplified block diagram of the 1- and 3-Port Input module is shown in Figure 7-1.
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