E1/2048 Khz Output Module - Symmetricom SSU-2000e User Manual

E1/2048 kHz Output Module

This section provides operating instructions and software provisioning procedures
for the Symmetricom E1/2048 kHz Output module (part number 23413292-000-0)
designed for use in the SSU-2000e Synchronization Supply Unit.
Functional Overview
The E1/2048 kHz Output module generates 20 outputs that are software- selectable
for either E1 or 2048 kHz output signals. Each output port can be turned off
independently of other ports; relays on each port disconnect the driver output from
the output pins. A squelch feature turns off selected ports when the system PQL
falls below predetermined quality levels.
The E1 signal has a multiframe format, with selectable Channel Associated
Signaling (CAS) or Common Channel Signalling (CCS); CRC4 can be turned on or
off. These default settings do not affect functionality. The Synchronization Status
Message (SSM) can be turned on or off, and the bit position can be set to 4, 5, 6, 7,
or 8 of time slot 0 of the odd frames. Zero suppression can be turned on or off as
required. When zero suppression is off, the signal has Alternate Mark Inversion
(AMI) encoding. When zero suppression is on, HDB3 encoding is used.
The output SSM can be automatically set by the input signal or manually using an
ICS or TL1 command. See the SSU-2000e Technical Reference for details on
setting the output SSM.
Provisioning the Signal Type
You use software commands to set the signal type on each port of the E1/2048 kHz
Output module. To view or provision the output frequency using ICS commands,
see the SSU-2000e Technical Reference.
To view the output frequency setting, use the TL1 command
, described in the SSU-2000e Technical Reference.To provision the
OUTE12048
output parameters, use the TL1 command
SSU-2000e Technical Reference.
Output Squelching
The E1/2048 kHz Output module allows you to selectively turn off (squelch) the
outputs during periods of degraded performance.
This feature allows you to turn off any of the 20 output ports on redundant or non-
redundant modules. The SSU-2000e uses the system Priority Quality Level (PQL)
to determine when the system is operating within specified limits; if the outputs
become degraded, the system automatically turns off the assigned ports.
12713140-002-2 Revision E – October 2006
Chapter 8 Output Module Reference Data
E1/2048 kHz Output Module
RTRV-PRMTR-
SET-PRMTR-OUTE12048
SSU-2000e User's Guide 201
, described in the