Led Functions - TC Communications TC8116 User Manual

LED Functions

The TC8116's front panel LED indicators are divided into four categories: Power, Alarms, Optic Signal and
Electrical Signal status. By understanding the functions of the LEDs & DIP switches, the user can ease
installation and troubleshooting.
Groups 1 & 12 Power supply and voltage indicators. These LEDs should always be lit whenever
power is connected (with the exception of either "PWR A" or "PWR B" when the power
redundancy feature is not utilized.
A
PWR A : +12V DC power supply from DC power A input.
B PWR
PWR B : +12V DC power supply from DC power B input.
Vcc
Vcc : +5V DC operating voltage derived from "PWR A" and/or "PWR B."
Not Used.
Group 11 General alarm indicators. In a fault condition, the "ALM" LED will flash and one or
more other alarm LED will be unlit.
ALM
ALM: (flashing) One of the "Tx" or "Rx" optic signals has been lost.
RxA
SYNC
RxA: (unlit) The optic signal at "RxA" has been lost or is degraded.
RxB
SYNC: When lit, it means a valid data packet is recognized at the active receiver.
RxB: (unlit) The optic signal at "RxB" has been lost or is degraded.
Groups 4 & 9 Optic status indicators.
USE RxA: (A board) When lit, it means the optic signal received at "RxA" is above the
sensitivity threshold and "RxA" is the active receiver. It does not necessarily mean a
valid signal is received.
USE RxA
USE RxB
USE RxB: (A board) Same as "USE RxA," but for the backup link. When lit, it usually
RMTLB
means there is a problem with the "A" fiber link and the backup link is being used.
LOCLB
RMTLB: Loops back the electrical signal on the remote unit through fiber back to the
source, see figure 17 on page 15.
LOCLB: Loops back the electrical signal to the source.
TxBCLK
TxFCLK
TxBLCK: This LED indicates that the transmit bit clock is received from the base
RMTLB
board.
LOCLB
TxFLCK: This LED indicates that the transmit frame clock is received from the base
board.
Groups 5 & 8 Electrical signal channel status indicators. Each RJ-11 port (at the rear panel) has
two LEDs (on the front panel) showing its electrical signal status.
IN - OUT
1
The green "OUT" LEDs indicate the electrical signal transmit status for each channel
2
(from the local device); the green "IN" LEDs indicate the
3
channel's receive status (from the remote device).
4
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TC8116
User's Manual
Rev. 5.6D