CTS MCT-5002FSMSFP+ User manual

(Version 1.0)
Scenario 1-1: When one set of MCT-5002FSMSFP+ connects to two end
devices, and Signal Loss Alarm is “Disabled”on MCT-5002FSMSFP+.
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-5002FSMSFP+ connects to two end
devices, and Signal Loss Alarm is “Enabled”on MCT-5002FSMSFP+.
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-5002FSMSFP+ will link down to alert the network administrator to do the
network troubleshooting immediately.
Fig. 1-1
Fig. 1-2
Introduction of MCT-5002FSMSFP+
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-5002FSMSFP+.
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-5002FSMSFP+ 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-5002FSMSFP+.
If Signal Loss Alarm is disabled, MCT-5002FSMSFP+ 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-5002FSMSFP+.
The following scenarios illustrate the linking status of end devices with “Enabled” or “Disabled” Signal Loss Alarm of MCT-5002FSMSFP+.

(Version 1.0)
Scenario 2-1: When two sets of MCT-5002FSMSFP+ that link together connect
to one end device separately, and the link fault occurs on MCT-5002FSMSFP+
#1’s RX1 with “Disabled”Signal Loss Alarm.
In case there is a fault taken place on the fiber cable (See Fig. 2-1), the port link of FO1 on
MCT-5002FSMSFP+ #1 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 of MCT-5002FSMSFP+ #1.
End Device #1 will link up due to the reason that it can continuously receive the optical signal
transmitted from FO2 fiber port of MCT-5002FSMSFP+ #2 through FO2 fiber port of
MCT-5002FSMSFP+ #1. Thus, the network administrator may be unaware of the link fault.
Actually, the total network cannot work normally.
Scenario 3-1: When two sets of MCT-5002FSMSFP+ that link together connect
to one end device separately, and the link fault occurs on MCT-5002FSMSFP+
#1’s RX2 with “Disabled”Signal Loss Alarm.
In case there is a fault taken place on the fiber cable (See Fig. 3-1), the port link of FO2on
MCT-5002FSMSFP+ #1 will be down due to the failure of receiving the optical signal. End
Device #1 will also become link-down because it cannot receive the optical signal transmitted
from FO2 fiber port of MCT-5002FSMSFP+ #1.
End Device #2 will link up due to the reason that it can continuously receive the optical signal
transmitted from FO1 fiber port of MCT-5002FSMSFP+ #1 through FO1 fiber port of
MCT-5002FSMSFP+ #2. Thus, the network administrator may be unaware of the link fault.
Actually, the total network cannot work normally.
Scenario 2-2: When two sets of MCT-5002FSMSFP+ that link together connect
to one end device separately, and the link Fault occurs on MCT-5002FSMSFP+
#1’s RX1 with “Enabled” Signal Loss Alarm.
In case there is a fault taken place on the fiber cable (See Fig. 2-2), the port link of FO1 on
MCT-5002FSMSFP+ #1 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 of MCT-5002FSMSFP+ #1, and the optical signal transmitted to End
Device#1 from FO2 fiber port of MCT-5002FSMSFP+ #2 through FO2 fiber port of
MCT-5002FSMSFP+ #1 will be blocked as well. Thus, end devices at both sides will link down
to alert the network administrator to do the network troubleshooting immediately.
Scenario 3-2: When two sets of MCT-5002FSMSFP+ that link together connect
to one end device separately, and the link fault occurs on MCT-5002FSMSFP+
#1’s RX2 with “Enabled”Signal Loss Alarm.
In case there is a fault taken place on the fiber cable (See Fig. 3-2), the port link of FO2on
MCT-5002FSMSFP+ #1 will be down due to the failure of receiving the optical signal. End
Device #1 will also become link-down because it cannot receive the optical signal transmitted
from FO2 fiber port of MCT-5002FSMSFP+ #1, and the optical signal transmitted to End
Device#2 from FO1fiber port of MCT-5002FSMSFP+ #1 through FO1fiber port of
MCT-5002FSMSFP+ #2 will be blocked as well. Thus, end devices at both sides will link down
to alert the network administrator to do the network troubleshooting immediately.
Fig. 2-1
Fig. 3-2
Fig. 2-2
Fig. 3-1