T1 Alarm Contact
The Single Channel T1 System alarm contact allows you to monitor the health of your T1 Fiber Link system. If
any of the below faults are present the alarm contact will revert to its normal state:
•
BPV
- Bi-polar Violations
•
AIS
- All One’s Condition
•
FRM Alarm
- Fiber Frame Loss
•
PWR
- DC Power Loss
When all of the above conditions are OK the contact will change from its resting state to indicate that the system
is running and healthy.
Switch Settings
The DIP switch is located on the top surface of the card. You may need to pull the card slightly out of the card
housing to gain sufficient access to the switch.
B8ZS or AMI Encoding
The AMI/B8ZS DIP switch is used to establish the selection of B8ZS (bit 8 zero substitution) or AMI (alternate
mark inversion) line encoding for the T1 input.
Remote Loopback
The remote (RLOOP) loopback DIP switch is provided to allow for remote loop back of the copper T1 line for
trouble shooting purposes.
The loop back function begins at the T1 receive twisted pair, through the T1 LIU (Line Interface Unit), and then
back out the T1 transmit twisted pair. Normal operating position is OFF for All switch positions.
RLOOP (Remote Loopback) Switch Diagram
OUT
IN
RX
TX
RX
TX
TX
RX
CO Side Module
(Remote Side)
SUB Side Module
(Local Side)
T-1 TEST
EQUIPMENT
Fiber
1 2 3 4 5 6
ON
ON
1 2 3 4 5 6
• Turn on
RLOOP
switch to check
copper wire connection
LLOOP
RLOOP
ON
LBO-15
LBO-7.5
NOT USED
ON - AMI
OFF - B8ZS
1 2 3 4 5 6
Signal Loop
RLH Industries, Inc. • Tel. 866-DO-FIBER • Fax 714 532-1885 • www.fiberopticlink.com
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