METRObility Optical Systems R111-18 User Manual
Radiance 10Mbps Single Interface Line Cards 11
Link Loss Carry Forward (LLCF)
*
The Radiance 10Mbps single interface line cards incorporate an LLCF function
for troubleshooting a remote connection. When LLCF is enabled, the FL and TP
ports do not transmit a link signal until they receive a link signal from the
opposite port.
for troubleshooting a remote connection. When LLCF is enabled, the FL and TP
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 a good link
status using Radiance line cards for remote connectivity. Note that LLCF is
enabled as indicated in the diagram.
status using Radiance line cards for remote connectivity. Note that LLCF is
enabled as indicated in the diagram.
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
Radiance
Line Card
Radiance
Line Card
LED lit = established link
LED unlit = no link
LLCF is ON
LLCF is ON
TP
TP
FL
Remote
Cable
If the connection breaks, the line card carries that link loss forward to the
switch/hub which generates a trap to the management station. The administrator
can then determine the source of the problem.
switch/hub which generates a trap to the management station. The 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
Radiance
Line Card
Radiance
Line Card
LLCF is ON
LLCF is ON
TP
TP
Broken
FL 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
Radiance
Line Card
Radiance
Line Card
LLCF is ON
LLCF is ON
TP
Broken
TP
Cable
FL
Remote
Cable
Important: When connecting a Radiance line card with LLCF enabled to an auto-
negotiating device, force both sides of the configuration to 10Mbps and either full
or half duplex. This allows the card to immediately see link pulses and start passing
data.
negotiating device, force both sides of the configuration to 10Mbps and either full
or half duplex. This allows the card to immediately see link pulses and start passing
data.
* Line cards are shipped with LLCF disabled (OFF).