Output Module Reference Data
Line Retiming Unit (LRU)
206 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
Figure 8-17. Block Diagram of the DS1 LRU Module
Power Regulation
The SSU-2000 power input voltage range is from –37.5 vDC to –72 vDC. The input
voltage (regulated to –37.5 vDC) is converted to outputs of +5 vDC, +3.3 vDC, and
+1.5 vDC.
Micro-controller Unit (MCU)
The micro-controller unit (MCU) supports the Motorola Serial Peripheral Interface
(SPI) protocol and performs interface functions with the other boards in the shelf
(via the SPI bus), configuration of the LRM, and monitoring. The SPI allows module
provisioning and generates events based on module status, clock reference status,
and port status.
An internal MCU one-shot watchdog timer monitors the MCU for activity and
controls the STATUS LED. It is responsible for placing the CTA into bypass,
re-starting the MCU, and re-initializing the module when the module malfunctions.
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