(
Version 1.0)
Scenario 1-1: When one set of MCT-500 connects to two end
devices, and Signal Loss Alarm is
“Disabled” on MCT-500.
In case there is a fault taken place on the fiber cable (See Fig. 1-1), the port link of
FO1
will be
down due to the failure of receiving the optical signal.
End Device #2
will also become
link-down because it cannot receive the optical signal transmitted from
FO1
fiber port.
End Device #1
will link up due to the reason that it can continuously receive the optical signal
transmitted from
FO2
fiber port through
FO1
fiber port. Thus, the network administrator may be
unaware of the link fault. Actually, the total network cannot work normally.
Scenario 1-2: When one set of MCT-500 connects to two end
devices, and Signal Loss Alarm is
“Enabled” on MCT-500.
In case there is a fault taken place on the fiber cable (See Fig. 1-2), the port link of
FO1
will be
down due to the failure of receiving the optical signal, and the optical signal transmitted to
End
Device#1
from
FO2
fiber port through
FO1
fiber port will be blocked as well. Thus, end devices
at both sides of MCT-500 will link down to alert the network administrator to do the
network troubleshooting immediately.
Fig. 1-1
Fig. 1-2
Introduction of MCT-500
Signal Loss Alarm Behavior
(
Version 1.0)
Signal Loss Alarm allows users to easily identify and diagnose the linking status by the signal loss status passed to end devices at both sides of MCT-500.
If Signal Loss Alarm is enabled (PIN 2 is set to ON), the fiber ports can link up only when both linking conditions are good. In addition, MCT-500 will simultaneously stop the optical signal
transmission at both sides when the signal loss occurs at one side. The fiber port links will be down to alert the user even the output of optical power exists. Configure Signal Loss Alarm DIP switch
as “Enabled” status, it provides users transparent link indication between two network devices interconnected by MCT-500.
If Signal Loss Alarm is disabled, MCT-500 will fail to transmit the optical signal to the port at the other side when the signal loss occurs at one side. The fiber link from this port will be
down even the output of optical power exists, and vice versa.
However
, if the end device’s link up is based on the condition of optical power (e.g. EDFA), the fiber ports may link up due to the continuous output of optical power (No Loss of Power occurs) even
the signal loss occurs at one side of MCT-500.
The following
scenarios illustrate the linking status of end devices with “Enabled” or “Disabled” Signal Loss Alarm of MCT-500.
