AMG Systems Ltd. reserves the right to make changes to this
document without notice. The information herein is believed to
be accurate. No responsibility is assumed by AMG for its use.
Page 8 of 12
AMG6184-DR-SF Instruction Sheet
D18236-01.doc
Self Diagnostic LED indicators
In normal operation,data is transmitted continuously on both a Primary and a Secondary optical
channel in different directions around the fibre loop. The system is Dual Redundant and if one or more
optical faults develop, the ring will automatically adapt to maintain the best optical path.
An
AMG6184-DR-SF
or rackmount
AMG6184R-DR-SF
receive unit continuously monitors the optical
status of each
AMG6113-DR-SF
or
AMG6113R-DR-SF
insert unit and sends this status information
around the fibre loop to every insert unit. Each insert unit displays the status of both the Primary and
Secondary optical channels using the fibre optic status LEDs. This information is in addition to the
standard status indication.
An optical fault condition can either be as a result of a failed insert unit or a fibre break. If an optical
fault is present at a preceding insert unit, the relative location of the optical fault is indicated by flashing
(red) the appropriate Primary Rx or Secondary Rx LED a number of times. The location of the failed
unit is viewed relative to itself and in the direction of the received optical signal. The number of red
LED flashes is a "count" which indicates the number of working units between itself and the optical
fault.
In the case of a complete failure of the Receive Unit or all connected optical fibres, this would render
the system unusable and the Diagnostic LED indicators invalid.
Self Diagnostic LED Example 1: Single Fibre Break
In the following example, a system is comprised of four insert units Tx1-Tx4 and one receive unit Rx1
and there is a fibre break present between two adjacent insert units Tx3 and Tx4. The break affects
both the the Primary and Secondary Optical channels.
a) At insert unit Tx1
, the Pri-Rx LED flashes twice: indicating a Primary Rx. fault in the direction of
Tx2, 2 units away. The Sec. Rx LED flashes twice: indicating a Secondary Rx. fault in the direction of
Rx1, 2 units away.
b) At insert unit Tx2
, the Pri-Rx LED flashes once: indicating a Primary Rx. fault in the direction of
Tx3, 1 unit away. The Sec. Rx. LED flashes 3 times: indicating a Secondary Rx. fault in the direction of
Tx1, 3 units away.
c) At insert unit Tx3
, the Pri-Rx LED is off: indicating that this unit is not receiving a Primary signal
from Tx4. The Sec. Rx LED flashes 4 times: indicating a Secondary Rx. fault in the direction of Tx2, 4
units away. The Sec-Tx LED is off: indicating that the Secondary Tx. (output) has been turned off.
d) At insert unit Tx4
, the Pri Rx LED flashes 4 times: indicating a Primary Rx. fault in the direction of
Rx1, 4 units away. The Sec. Rx LED is off : indicating that this unit is not receiving a Secondary signal
from Tx3.
