Japanese Composite Clock Output Module; Functional Overview - Symmetricom SSU-2000 User Manual

Japanese Composite Clock Output Module

This section provides reference data for the Japanese Composite Clock Output
module (part number 23413306-000-0) used in both the SSU-2000 main shelf and
in the optional SDU-2000 Expansion shelf.

Functional Overview

The Output module generates 20 non-summable signal pairs (TTIP and TRING
signal pairs). Each output is a transformer-coupled symmetrical pair. Each output
pair can be turned off independently of other channels. These outputs are
independently configurable for phase delay from 0 to 3.4 μs in 8 steps. Refer to
Changing Factory
A squelch feature allows you to selectively turn off (squelch) the outputs during
periods of degraded performance. The output is squelched when the system priority
quality level (PQL) is larger (of lower quality) than the provisioned Squelch PQL.
In Subtending mode, the Output module's signals are byte and polarity phase
aligned with the 4 kHz clock signal from the Japanese Composite Clock Input
module. This 4 kHz clock signal ensures that the phase of the composite clock
output signal follows the phase of the composite clock input reference signal. Refer
to Configuring a Subtending
subtending SSU.
When provisioned properly, the output aligns to the 400 Hz BPV component.
Note: The following version or a later version of the Buffer module,
Clock module, Clock module software, and Comms module software
is required for subtending mode.
Each output signal is monitored for a failed output on an independent basis. An
output is said to be failed when either the polarity pulse falls below approximately
0.6 volt base to peak, when polarity reversal can no longer be detected, or when
return to zero cannot be detected.
The outputs of the module meet the criteria set forth in the document ITU-T Rec.
G.703 Appendix II.1.
12713020-002-2 Revision F.01 – January 2007
Defaults, on page 114 for more information on duty cycle settings.
SSU, on page 272 for details on configuring a
Buffer module (part number 25413122-000-0 rev A.07)
Clock module (part number 23413015-000-0 rev A.08, or
23413016-000-0 rev A.09)
Clock module software (rev. J.00)
Comms module software (rev. J.00 - load 00 for standard)
(rev. G.00 - load 01 for NTP)
Chapter 8 Output Module Reference Data
Japanese Composite Clock Output Module
SSU-2000 User's Guide 215