CANOGA PERKINS 9145E Standard NID Software Version 1.0 - Manual (Page 61)

Port Information 9145E NID Software User’s Manual
Port Configuration
51
5. RMTF - Remote Fault (RMTF) allows an alarm to be transmitted to the link partner to indicate loss
of signal on receive (see Figure 5-6). When a link loss is detected, the port stops transmitting
service traffic on the port and begins to transmit the Remote Fault signal so the connected link
knows the link is no longer operational. RMTF is only available on optical (SFP) ports.
A port that is receiving Remote Fault is treated as if the link is down for purposes of Link Loss
Forwarding and alarming. Even though the link is still up, only Remote Fault is being received and
service traffic is not flowing. Once the link fault is corrected, Remote Fault transmission is
automatically terminated and service traffic flow will resume.
Use the Space Bar to cycle between User Port Enabled, Net Port Enabled, Both Ports Enabled,
and Disabled.
Figure 5-6 Remote Fault Signal
6. LLF - Enables or disables Link Loss Forwarding (LLF). Link Loss Forwarding allows the 9145E to
signal attached equipment that a link has gone down by bringing down the attached link.
If User->Network is selected, if the User Port link is down, the Network Port will be disabled.
If Network->User is selected, the User Port will be disabled if the Network Port goes down.
If Both Directions is selected, either port can bring down the other port. LLF can only be active in
one direction at a time, however. When the original link is restored, the partner link is also restored.
Use the Space Bar to cycle between User->Network, Network->User, Both Directions, or Disabled.
Figure 5-7 Link Loss Forwarding Propagation
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