Fiber Fault Loopback FFL, Last Gasp | IMC Networks IE-IMCV-T1-MUX/4

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