CANOGA PERKINS 9161 Network Interface Device - Manual (Page 14)

9161 Network Interface Device 2-4
Remote Fault
If the Extension port Rx loses the signal, it sends a Remote Fault (RMTF) signal from its Tx, the Rx
LED is off, and an alarm flags the link loss on the Extension port; see Figure Error! Reference
source not found.. When the Extension port receives a Remote Fault signal, the Rx LED lights red
and an alarm flags the remote side optical link failure. Both local and remote link partners must be
configured to the same RMTF enable/disable setting. To set RMTF in software, reference Manage
Traps and Alarms. RMTF complies with the IEEE802.3u Remote Fault standard.
Usr
Prt
Ext
Prt
Rx
Rx Tx
Tx
Usr
Prt
Ext
Prt
Rx
Rx Tx
Tx
RMTF
Local Device Remote Device
• Tx transmits RMTF to remote device
• Local device Rx turns OFF
• Local device Rx detects link loss
• Remote device Rx lights red
Figure 2. Remote Fault Signal
Link Loss Forwarding
When LLF is enabled, a fault on one side of the 9161 propagates to the other side to notify that device
and stops signal transmission (brings down the link). See Figure Error! Reference source not
found.. Set the LLF propagation to User to Extension, Extension to User, or both directions. Set this
in the User Interface.
Figure 3. Link Loss Forwarding Propagation