Status Led Indicators; Front Panel Of The E1 Lrm - Symmetricom SSU-2000 User Manual

Chapter 8 Output Module Reference Data
E1 Line Re-timing Unit
Micro-Controller Unit (MCU)
The microcontroller 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.
Memory
The module's on-board memory stores the executable image, the FPGA image, and
any persistent or non-persistent information that the processor may need. The
module has 512 Kilobytes of RAM for dynamic memory storage with 256 Kilobytes
of FLASH memory used to store the program code and configuration information for
the FPGA.

Status LED Indicators

Eight LEDs on the front panel show the current operating status of the module. The
LEDs are shown in
Figure 8-31. Front Panel of the E1 LRM
260 SSU-2000 User's Guide
Figure 8-30 and are described in Table 8-25.
12713020-002-2 Revision F.01 – January 2007