Output Section - Symmetricom SSU-2000e User Manual

In either mode, when the Priority and PQL values are equal for each input, the
physical location of the Input module determines the priority for selecting the input
reference. Port 1 on the Input module in the leftmost slot has the highest priority; the
priority decreases to port 1 on the Input module in the rightmost slot. Port 2 on the
module in the leftmost slot has the next lower priority, decreasing to Port 2 on the
Input module in the rightmost slot. Port 3 on the module in the leftmost slot has the
next lower priority, and Port 3 on the module in the rightmost slot has the lowest
priority.
If the Input module is configured for provisioned mode, it reports the user-assigned
SSM. If it is configured for automatic mode, the Input module uses the most recent
valid SSM. If a valid SSM is not received, the module uses the user-assigned SSM.
Setting an Input Alarm Strategy
You can provision the SSU-2000e to elevate input alarms to the next higher level
after a specified amount of time. You can also specify that an alarm clears
automatically after a specified period of time without the alarm condition. For more
information on alarms, see
Bypass Clock (Clock C)
In the event that both Clock modules fail, an input connected to a DS1, E1, or
Composite Clock Input module can serve as the system reference. The input must
be a valid reference, and it must have a Priority setting. When the Bypass clock is
the active reference, then the output signal is not filtered and any wander or jitter on
the input signal appears on the outputs. The Bypass clock is intended only for
short-term use; you should resolve the failures on the Clock modules as quickly as
possible.

Output Section

The output section is implemented with one or more Output modules (up to 6, in the
main chassis and up to 46 Output modules in a fully expanded system with four
SDU-2000e expansion chassis). Each Output module type provides 20 independent
or 10 paired output synchronization signals. Output modules are available to
support the following formats:
DS1, SF (D4) and ESF
E1
2048 kHz
Composite Clock (CC) (64/8 kHz)
Other typical clock frequencies
12713140-002-2 Revision E – October 2006
Alarms and Events, on page 29.
Chapter 1 Product Overview
System Architecture
SSU-2000e User's Guide 27