User`s guide

16 Metrobility 10/100Mbps Delta Class AutoTwister
Link Loss Carry Forward (LLCF)
The AutoTwister incorporates LLCF
*
for troubleshooting remote connec-
tions. When LLCF is enabled, the ports do not transmit a link signal until
they receive a link signal from the opposite port.
The diagram below shows a typical network configuration with good link
status using Metrobility AutoTwisters for remote connectivity. Note that
LLCF is enabled as indicated in the diagram below.
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
AutoTwister AutoTwister
LED lit = established link LED unlit = no link
LLCF is ON LLCF is ON
Remote
Cable
If a connection breaks, the AutoTwisters carry that link loss forward to the
switch/hubs which generate a trap to the management stations. A
network administrator can then determine the source of the problem.
Link Loss Carried Forward Link Loss Carried Forward
LED lit = established link LED unlit = no link
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
AutoTwister AutoTwister
LLCF is ON LLCF is ON
Broken
Remote
Cable
Link Loss Carried Forward
LED lit = established link LED unlit = no link
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
AutoTwister AutoTwister
LLCF is ON LLCF is ON
Broken
Cable
Remote
Cable
* Units are shipped with LLCF disabled (OFF).