18
User Guide
Link Loss Carry Forward (LLCF)
The Radiance 10Mbps redundant interface line card has been designed with
Link Loss Carry Forward ability for troubleshooting a remote connection. The
card is shipped with LLCF disabled.
When LLCF is enabled, the ports on the card do not transmit a link signal until they
receive a link signal from the opposite port. For example, if LLCF is enabled and
two redundant interface line cards are connected with nothing else connected to
them, the Link LED is not lit. When a valid link is established, a complete connec-
tion is accomplished.
The diagram below shows a typical network configuration using Radiance
redundant interface line cards for remote connectivity:
If the connection breaks, or the remote device fails, the card carries that link loss
all the way to the switch/hub which generates a trap to the management station.
The administrator can then look at the card to determine the source of the loss.
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
Redundant
Line Card
Redundant
Line Card
Remote
up to 100m
LED lit = established link
LED unlit = no link
Management
Station
Management
Station
Switch/Hub
w/SNMP
Switch/Hub
w/SNMP
Redundant
Line Card
Redundant
Line Card
Broken
Remote
Cable
Link Loss Carried
LED lit = established link
LED unlit = no link
