Link and Port Configuration
NetRunner W
AN User’s Manual
4-4
Port Defaults and Options (cont’d)
Port (Channel)
Number
Default
Possible Port Configuration
NR75E
A1
Interconnect Link
Interconnect, Frame Relay, Mux
or X.21 Link
A2
Async
Secondary Interconnect
1
, Frame
Relay Link; Async or Sync
2
A3
Async
Async or Sync
2
A4
Async
To be used as a Command Port,
although not dedicated
B1-C12
Async
Async
1
Port A2 may be configured as an interconnect link for connection to a secondary
interconnect link at the remote end. This link will activate only if the link on A1 is
non-operational.
2
Either A2 or A3 may be sync. Only one port at a time may operate sync. If A2 is
configured for sync, then A3 cannot be configured for sync, and vice versa.
Port Considerations
D
For optimal performance, highest speed Wide Area Network links
(interconnect, local interconnect, secondary interconnect, and frame
relay) should be configured on the lowermost channels (i.e., A1, A2)
followed by lowspeed WAN links, then mux links, X.21 links, and data
channels (sync, async, voice and LAN). Exceptions are as follows:
- If an integral DSU/CSU is installed in the chassis, it will map to
A1 and/or A2, forcing high speed WAN links to A3 and higher.
- If WAN links are configured on the 5000E/6DMA module, they
must not exceed the available aggregate. In this case, WAN links
may follow mux links.
D
If your network contains two NetRunners located in close proximity
(colocated), configure a port on each unit as a local interconnect link.
(This is not applicable to the NR50EF and NR75E models.)
D
If any of your ports are to be used as a backup link to an interconnect
link, configure the port as a secondary interconnect link.
