Telco Systems Metrobility 10/100 AutoTwister 2643-13-01, Инструкция по установке и эксплуатации

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Metrobility 10/100 AutoTwister 15
Link Loss Return (LLR)
The fiber optic ports of the Metrobility AutoTwister have been designed with LLR
*
functionality for troubleshooting a remote connection.
When LLR is enabled, the fiber port’s transmitter shuts down when its receiver fails
to detect a valid receive link. LLR is normally enabled on one end of the link and is
typically enabled on either the unmanaged or remote device. Setting LLR on both
ends of the link necessitates auto-recovery. See Auto-Recovery on page 17.
The diagram below shows a typical network configuration with good link status us -
ing AutoTwister standalone units for remote connectivity.
If one of the optical conductors is bad (as shown in the diagram box below), the
AutoTwister with LLR enabled will return a no-link condition to its link partner. This
aids the administrator in determining the source of the loss.
PC
Remote
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
AutoTwister AutoTwister
TP TP Fiber
Cable
LED lit = established link LED unlit = no link
LLR is OFF
LLR is ON
PC
Remote
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
AutoTwister AutoTwister
Link Loss Returned
LED lit = established link LED unlit = no link
TP TP Broken
Fiber
Conductor
LLR is OFF LLR is ON
*Units are shipped with the LLR function disabled (OFF).