MRV Communications EM316SW-XY Benutzerhandbuch

 

 

 

 

 

 

 

 

®

 EM316SW-XY 

 
 PN 1288003-001, Rev D2 

7

 
 

 

 

Figure 4   -- Redundant Link Mode 

 
In Redundant Link mode, the module acts as a copper to redundant fiber (100Base-FX) 
converter. This configuration requires optical SFPs installed in ports P2 and P3 to support a pair 
of redundant fiber optic paths. Ethernet port P4 is disabled in this mode; only description 
commands will have any effect on P4. The Redundant Link mode provides “1:1” link protection. 
Dual-homing is not supported. 
 
In this mode, the EM316SW-XY can pass link status with LIN or with the industry standard Far 
End Fault Indication (FEFI). Implementing both tools allows for backwards compatibility with the 
full set of MRV Fast Ethernet media conversion solutions while supporting standard connectivity 
to any standard Fast Ethernet fiber optic port. 
 
With LIN enabled, loss of link at BOTH fiber ports (P2 and P3) disables the transmitter of the 
access (Ethernet) port (P1). If one fiber optic channel fails while the other fiber optic channel is 
operational, LIN does not interrupt the data. Downstream switches, routers, and other link-state 
dependant devices can accurately react to changing link conditions. This feature is especially 
valuable in fault-tolerant network designs. Set both DIP switches (FEFI and FEFI2) ON to 
enable FEFI with LIN in Redundant Link mode. 
 
The “select-link” command is enabled for ports P2 and P3 in Redundant Link mode to force a 
port to active if it has an available link. There is no default or preferred port, so the first link 
established becomes active. The “shutdown” command is not available for redundant ports P2 
and P3.