Table 4.2 CPU Board 1 and 2 Communications Status Indications
CPU
Board
LEDs
Indication
STX2
[D13]
RS-422 GPS transmit active.
Illuminates green during power up only, otherwise it is OFF.
SRX2 RS-422 GPS receive active.
STX1
[D1]
RS-232 serial port transmit active.
Blinks red during RS-232 communication with the controlling com-
puter.
SRX1
[D2]
RS-232 serial port receive active.
Blinks red during RS-232 communication with the controlling com-
puter.
ETX
[D3]
Ethernet transmit active.
Blinks during Ethernet communication. This LED is always OFF if no
Ethernet cable is attached.
ERX
[D4]
Ethernet receive active.
Blinks during Ethernet communication. This LED is always OFF if no
Ethernet cable is attached.
CLSN
[D5]
Ethernet collision.
Blinks red during power up, and when no Ethernet cable is attached.
LED3 General purpose lights used for CPU/RAM status and power-on
self-test.
LED2
LED1
LED0
LOCK 1 PPS lock for GPS communications ((not supported in this release
F6300 Power System Simulator User Guide
72A-2337-01 Rev. B 11/05 4-7
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