B&B Electronics 857-18400 - Manual User Manual

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FX LinkLoss (FXLL)

FX LinkLoss is a link integrity monitoring feature that forwards fiber link faults to the
RJ-45 DATA port to indicate that a fiber link fault has occurred. FX LinkLoss can be
enabled in iView².

Link Fault Pass-Through (LFPT)

Link Fault Pass-Through (LFPT) is a troubleshooting feature that passes a link fault from
the Ethernet port on one module through to the Ethernet port on the other module.
LFPT can be enabled via iView² or through the console port.

The link fault is passed through the media conversion and is observed at each end. It
acts just as it would if the end devices were directly connected without a fiber link.

E1 Ports Setup
Alarm Level

E1 lines are defined as LOST when no signal is received as defined by ITU G.775
specifications 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 IS state. During initial
installation or normal maintenance, the end-user can place the unit in the OOS (Out-
Of-Service) state to inhibit unwanted SNMP TRAP alarms.

Loopback

Each E1 port can be tested in loopback mode by enabling either a Host loopback or
Remote loopback test path. This capability allows the end-user to help troubleshoot
and isolate system problems such as improper/broken line terminations, cables or
malfunctioning equipment.

With Host loopback, the E1 copper port, connected to the Host unit, is looped back
to that port within the local unit. E1 data coming from the remote unit to that port
over the optical link is also looped back to the remote unit at the same point within
the local unit.

With remote loopback, an E1 line connected to the Host unit is transported onto the
optical link and looped back within the remote unit back onto the optical link
without passing onto the copper E1 line of the remote unit. The remote’s incoming
E1 copper line is also looped-back to the copper line within the remote unit.

The default value for loopback is "none."