IMC Networks IE-IMCV-T1-MUX/4 User Manual

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Fiber Fault Loopback (FFL)
When a Fiber LOS is detected, the unit sends a Remote Alarm Indication) back to the
fiber in the opposite direction. The reception of fault indication on the fiber line
inhibits sending a LINK signal to the Ethernet port. This function can be enabled at
both ends of the fiber line without causing a "lock-up" condition and will
automatically clear when the fault is cleared. FFL can be configured at both ends of
the fiber line with no lock-up condition.

Last Gasp
The iMcV-FiberLinX-II includes a Last Gasp feature, which sends a trap Flinx Unit
Down for the Host unit or a Flinx Remote Unit Down for the Remote unit (as seen in
iView²) when the power to the module fails.

T1 Ports
Alarm Level
T1 lines are defined as LOST when no signal is received as defined by ITU G.775
specifications Loss Of Signal (LOS), and are considered in error with a BER of 10^-6.
If either of these conditions lasts for more than 2.5 seconds, an ALARM state is
declared. This error condition must be absent for 10 seconds for the alarm state to
clear.

The starting and ending event of all alarm conditions will generate an SNMP TRAP
when the unit is installed in a managed chassis and set to the in service state. During
initial installation or normal maintenance, the end-user can place the unit in the Out-
Of-Service (OOS) state to inhibit unwanted SNMP TRAP alarms.

Alarm Conditions
• Last gasp (remote lost power)
• T1 Port Up

• T1 Port LOS
• Fiber port Up / LOS

• SFP removed/installed

• Service state change