TC12 Installation, Commissioning & Maintenance Handbook
Figure 16 - Modem and PSU PCB Status LEDs
MODEM BOARD STATUS LEDs
LP1 (RED LED) - +12v
LP2 (RED LED) - -12v
LP3 (RED LED) - +5v
LP4 (YELLOW LED) - MODEM 1 TRANSMIT (TX1)
ECEIVE (RX1)
LP6 (YELLOW LED) - MODEM 2 TRANSMIT (TX2)
LP7 (GREEN LED) - MODEM 2 RECEIVE (RX2)
LP8 (YELLOW LED) - MODEM 3 TRANSMIT (TX3)
LP9 (GREEN LED) - MODEM 3 RECEIVE (RX3)
LP10 (YELLOW LED) - MODEM 4 T R AN SMIT (TX4)
LP11 (GREEN LED) - MODEM 4 RECEIVE (RX4)
LP5 (GREEN LED) - MODEM 1 R
PSU BOARD STATUS LEDs
PC POWER
AUDIO OFF
2.4.2 Effect of Incorrect Switch Settings on the PSU PCB
(1) S1 - PC Address
If this switch is set to a PC number which does not exist, the UTC TCC FAIL
indicator on the local SIP will light up. The traffic control computer will display an
error message to say that the PC is disconnected.
(2) S2 - Audio Alarm Configuration Switch
666/HE/43100/000 Page 48 Issue 9