Chapter 1 Product Overview
Communications Protocol
44 SSU-2000e User’s Guide 12713140-002-2 Revision E – October 2006
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 2048 kHz Output Module, on page 209.
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 RS-422 Output
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.
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