2 link loss forwarding, Link loss forwarding -3, Figure 2. remote fault signal – CANOGA PERKINS 9155 Network Interface Device User Manual

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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

3.2.2 Link Loss Forwarding

When LLF is enabled, a fault on one side of the 9155 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

9155 Network Interface Device

3-3

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