E1 Output Module - Symmetricom SSU-2000e User Manual

Chapter 8 Output Module Reference Data

E1 Output Module

E1 Output Module
This section provides user-reference data for the E1 Output module (part number
23413018-000-0) that is used in both the SSU-2000e main chassis and in the
optional SDU-2000e expansion shelf.
Functional Overview
The E1 Output module uses one of three 4 kHz clocks from the SSU-2000e main
chassis backplane to generate a phase-locked signal of 2.048 Mbps. If the unit is
inserted into an SDU-2000e expansion shelf, a fourth 4 kHz clock (D-clock) is
available. The phase-locked 2.048 Mbps signal is used to generate a set of 20
output signals for distribution to large networks.
In addition, the phase-locked 2.048 Mbps signal is used to clock the frame
generator (or framer) for insertion of proper framing bits.
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.
A microcontroller unit on the E1 Output module communicates with other boards in
the main shelf and performs Output module configuration. The module's memory
subsystem (EEPROM, RAM and serial EEPROM) stores the executable image, the
PLD image and other configuration and temporary information for an on-module
microprocessor.
The E1 Output modules can be used individually or configured for operation as
redundant pairs in the shelf.
190 SSU-2000e User's Guide 12713140-002-2 Revision E – October 2006