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T640 SONET Clock Generators (SCGs) Components
Each SCG consists of the following components:
- 19.44-MHz Stratum 3 clock.
- Field-programmable gate array (FPGA) that performs multiplexing of clock sources.
- Three LEDs, located on the SCG faceplate, that display the status of the SCG. Table 1 describes the functions of the SCG LEDs.
- SCG online/offline button, located on the SCG faceplate.
- Two external clock inputs.
 |
Note: The external clock inputs on the SONET Clock Generators (SCGs) are not supported. |
Table 1: SCG LEDs
Label |
Color |
State |
Description |
|---|---|---|---|
OK |
Green |
On steadily |
SCG is online and is functioning normally. |
FAIL |
Yellow |
On steadily |
SCG has failed. |
MASTER |
Blue |
On steadily |
SCG is functioning as master. |
