Communications Protocol - Symmetricom SSU-2000e User Manual

Chapter 1 Product Overview

Communications Protocol

2048 kHz Output Module
The 2048 kHz Output module plugs into selected input/output slots in the
SSU-2000e main shelf or one of the output slots on the expansion shelf. The
module generates and monitors 20 independent 2048 kHz signals that are
referenced to a selected clock module. The 2048 kHz Output module receives a set
of three (four if installed in an expansion shelf) 4 kHz clocks from the Clock modules
and uses these clocks to develop an 8.192 MHz phase-locked signal. This
phase-locked signal is then used to generate 20 sets of 2048 kHz clock outputs. For
more information, see
RS-422 Output Module
The RS-422 Output module generates 10 balanced square-wave outputs (TTIP and
TRING signal pairs) and 10 single-ended (Ring) square-wave outputs. Each output
can be turned off independently of other ports; relays on each output disconnect the
driver output from the output pins. A squelch feature turns off selected ports when
the input signal falls below predetermined quality levels. See
Module, on page 215.
Buffer Module
The Buffer module buffers the backplane and clock signals sent from the main shelf;
the modules are installed in slots 15 and 16 of the SDU-2000e. Symmetricom
recommends a minimum of one Buffer module in each expansion shelf; a second
Buffer module provides redundancy.
Communications Protocol
This section summarizes the methods of controlling the SSU-2000e and the
available software features, depending upon the system functionality required.
Software Interface
There are four methods of controlling the SSU-2000e. The interfaces are:
TL1 – Transaction Language One
TL1 provides command sets to support all operation, administration, maintenance,
and provisioning tasks required to maintain and control an SSU-2000e system.
These tasks include configuring and provisioning security, monitoring system
performance, configuring hardware, locating and handling faults, and performing
equipment diagnosis and testing. Refer to the SSU-2000e Technical Reference for
more information.
ICS – Interactive Command Set
ICS also provides command sets to support all operation, administration,
maintenance, and provisioning tasks required to maintain and control an
SSU-2000e system from a terminal connected to one of the SSU-2000e EIA-232
serial ports. ICS commands are designed in a more readable interface for users
with an instructional help facility. Refer to the SSU-2000e Technical Reference.
44 SSU-2000e User's Guide
2048 kHz Output Module, on page 209.
RS-422 Output
12713140-002-2 Revision E – October 2006