Link Loss Carry Forward (Llcf) - METRObility Optical Systems Delta Class Installation And User Manual

Link Loss Carry Forward (LLCF)

The Metrobility Delta Class "twister" incorporates LLCF
ing remote connections. When LLCF is enabled, the ports do not trans-
mit 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 two "twister" units for remote connectivity. Note that LLCF is
enabled as indicated in the diagram below.
Management Switch/Hub
Station w/SNMP
LED lit = established link
If a connection breaks, each "twister" will carry that link loss forward to a
switch/hub which generates a trap to a management station. The net-
work administrator can then determine the source of the problem.
Management Switch/Hub
Station w/SNMP
LED lit = established link
Management Switch/Hub
Station w/SNMP
LED lit = established link
* Units are shipped with LLCF disabled.
14 Metrobility 100Mbps Delta Class "twister"
twister
LLCF is ON
LED unlit = no link
twister
LLCF is ON
Link Loss Carried Forward
LED unlit = no link
twister
LLCF is ON
Link Loss Carried Forward
LED unlit = no link
twister
LLCF is ON
Remote
Cable
twister
LLCF is ON
Broken
Remote
Cable
Link Loss Carried Forward
twister
LLCF is ON
Remote Broken
Cable Cable
*
for troubleshoot-
Switch/Hub Management
w/SNMP Station
Switch/Hub Management
w/SNMP Station
Switch/Hub Management
w/SNMP Station