- Enterasys Security Router User's Guide

Overview of WAN Interfaces
XSR User’s Guide 3-3
Overview of WAN Interfaces
The XSR supports as many as six serial cards (in an XSR-3250), each of which can support four
ports for a maximum of 24 serial ports. Each port is individually configurable regarding speed,
media-type, and protocol.
The Serial WAN interface performs the following functions:
• Transmit packets given by the protocol layer onto a serial link.
• Receive packets from a serial link and pass up to the protocol layer.
• Allow CLI configuration commands to be issued.
• Accumulate all MIB-II (RFC-1213) interface statistics regarding the transmission and reception
of bytes and packets.
WAN Features
The XSR supports the following WAN interface features:
• Alarms/events - For a complete list, refer to “Alarms/Events, System Limits, and Standard
ASCII Table” on page A-1 in this manual.
• Interfaces - The following interface types can be configured using the
media-type command:
– RS232 (also known as V.28) (default)
– RS422 (also known as RS-530)
– RS449 (also known as V.36)
– RS530A
–V.35
–X.21
•Either Sync or Async mode is set by using
physical-layer.
• Encoding - On Sync interfaces,
nrzi-encoding sets NRZI encoding (NRZ encoding is the
default).
ifInNUcastPkts Sum of non-unicast packets delivered to a higher layer protocol.
IfInDiscards Sum of inbound packets discarded.
IfInErrors Sum of inbound packets that contained errors.
IfOutOctets Sum of octets transmitted on the interface
ifOutUcastPkts Sum of subnetwork-unicast packets sent to the network.
ifOutNUcastPkts Sum of non-unicast packets transmitted to the network.
IfOutErrors Sum of outbound packets that could not be sent due to errors.
IfOutDiscards Sum of outbound packets discarded.
Table 3-1 MIB-II Interface Statistics (continued)
Variable Description