Port And 3-Port Ds1 Input Modules - Symmetricom SSU-2000e User Manual

Table 7-4. E1 Input Module Configuration (Continued)
Configuration Setting
MTIE Limit 1 Alarm Mode
MTIE Limit 2 Alarm Mode
Alarm Initial Severity
Alarm Initial Delay
Alarm Elevation Time
Port Status
Port Name

1-Port and 3-Port DS1 Input Modules

This section describes the 1-port (part number 23413013-001-0) and 3-port (part
number 23413013-002-0) DS1 Input modules that may be installed in an
SSU-2000e.
The 1-Port and 3-port DS1 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 modules), or three (3-Port Input modules)
of the following signals: sine or square wave, with frequency of 1, 1.544, 2.048, 5 or
10 MHz, or framed communication type DS1. If the input signal is a communications
type, the module monitors for Alarm Indication Signaling (AIS), Bipolar Violations
(BPVs), Loss of Signal (LOS) and Out Of Frame (OOF) errors. In addition, the
module extracts Synchronization Status Messages (SSMs) from the incoming data.
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.
12713140-002-2 Revision E – October 2006
Factory Default
Minor Ignore, Report, Minor, Major, or Critical
Major Ignore, Report, Minor, Major, or Critical
Minor (except Ignore, Report, Minor, Major, or Critical
LOS and level 2
MTIE, which are
Major)
0 seconds 0 to 86400 seconds
86400 seconds 0 to 500000 seconds
Disabled Enabled/Disabled
Any user-selected string from 0 – 20 characters
Chapter 7 Input Module Reference Data
1-Port and 3-Port DS1 Input Modules
Range
SSU-2000e User's Guide 173