Input Module Reference Data
1-Port and 3-Port DS1 Input Modules
154 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
Functional Overview
The DS1 Input module (1-port and 3-port versions) consists of a microcontroller and
firmware, SRAM for data storage, FLASH (contains the firmware), input signal ports,
and other support circuitry. The primary function of these modules is to perform
time-interval-measurements on Clock module A and Clock module B, using the
reference input signals. These measurements are used to adjust the frequency of
the oscillators on the two Clock modules.
Functional Block Diagram
A simplified block diagram of the 1- and 3-Port DS1 Input modules is shown in
Figure 7-3.
Figure 7-3. Block Diagram of the 1-Port and 3-Port DS1 Input Module
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