CANOGA PERKINS 9161 Network Interface Device - Manual (Page 15)

3.3.2 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 3. Set the LLF propagation to User
to Extension, Extension to User, or both directions. Set this in the User Interface; see Section 4.7.
• Link Loss detected on the Extension Port Rx
• Fault propogated to User Port
• User Port-Tx stops transmitting data
• User Port-Tx LED lights Red
Extension Port to User Port
Usr
Prt
Ext
Prt
Rx
Rx Tx
Tx
Usr
Prt
Ext
Prt
Rx
Rx Tx
Tx
Fault
No data
User Port to Extension Port
Tx
Usr
Prt
Ext
Prt
Rx
Rx
Tx
Usr
Prt
Ext
Prt
Rx
Rx Tx
Tx
Tx
No data
Fault
• Link Loss detected on the User Port
• Fault propogated to Extension Port
• Ext Port-Tx stops transmitting data
• Ext Port-Tx LED lights Red
Figure 3. Link Loss Forwarding Propagation
9161 Network Interface Device 3-3