CANOGA PERKINS 9145ELB Network Interface Device Hardware - Manual (Page 42)

9145ELB NID Hardware User’s Manual Troubleshooting
Fault Conditions
28
Figure 5-1 Remote Fault Signal
5.2.2 Link Loss Forwarding
When Link Loss Forwarding (LLF) is enabled, a fault on one side of the 9145ELB propagates to
the other side to notify that device and stop signal transmission (
Figure 5-2) . Set the LLF
propagation to User to Network, Network to User, or both directions.
For steps for configuring LLF, see the 9145ELB NID Software User’s Manual.
Figure 5-2 Link Loss Forwarding
Tx
Rx
Rx
Tx
x
RMTF
USER
PORT NETWORK
PORT
LOCAL DEVICE
Tx
Rx
Rx
Tx
USER
PORT NETWORK
PORT
REMOTE DEVICE
Local device ACT/LNK detects link loss
Tx transmits RMTF to remote device
Local device ACT/LNK turns OFF
Remote device ACT/LNK turns red
x
FAULT
NO DATA
Tx
Rx
Rx
Tx
RMTF
USER
PORT NETWORK
PORT
LOCAL DEVICE
Tx
Rx
Rx
Tx
USER
PORT NETWORK
PORT
REMOTE DEVICE
x
USER PORT TO NETWORK PORT
Link loss detected on User Port
Fault propogated to Network Port
Network Port Tx stops transmitting data
Network Port Tx ACT/LNK LED turns red
Link loss detected on Network Port
Fault propogated to User Port
User Port stops transmitting data
User Port ACT/LNK LED turns red
Tx
Rx
Rx
Tx
RMTF
USER
PORT NETWORK
PORT
LOCAL DEVICE
Tx
Rx
Rx
Tx
USER
PORT NETWORK
PORT
REMOTE DEVICE
x
NETWORK PORT TO USER PORT