Cabletron Systems CSX400 - Manual (Page 74)

CSX WAN Configuration
4-10 Interface Configuration Window
Figure 4-5. WAN Interface ConÞguration Window
IfIndex#
Displays the interface index; a unique value for each logical interface on this
device. This number is used when you map the interface on the fractional table of
a T1 port.
Protocol
Displays the active Link Layer protocol. You can assign PPP (Point to Point
Protocol), Frame Relay, or None as the protocol on the interface. An error message
will appear if you choose a protocol which is not supported by the Þrmware.
MTU
Displays the MTU (Maximum Transfer Unit) for this interface. The MTU is the
largest packet size that can be transmitted on the selected interface. The value in
this Þeld must be between 128 and 8191.
Line Coding
Displays the line coding set for this interface. You can choose from JBZS, Inverted
HDLC, or None. None (the default value) should not be selected when you are
using AMI line coding on the interface. Set this value according to your WAN
service providerÕs instructions.
NOTE
Interfaces assigned Frame Relay protocol will have a default MTU value of 4095;
interfaces assigned PPP protocol will have a default value of 8191.