3Com 09-1765-001 Decking User Manual


 
Theory of Operation 23
The PPP implementation in the AP uses the NCP as described in RFC 1220: PPP
Extensions for Bridging to encapsulate packets at the Ethernet level. The PPP
provides IP bridging control as defined by RFC 1172 and MAC-level bridging.
The protocol provides support for PPP negotiations conforming to RFC 1661.
Users cannot plug a non-AP node directly into the AP serial port, only AP-to-AP
PPP links.
For detailed information, refer to
RFC 1171: The Point to Point Protocol and RFC
1220: PPP Extensions for Bridging.
PPP Connection
Connecting an AP and a computer with a direct serial link requires the use of a
null-modem serial cable.
Null-modem serial cable pinout:
Connecting an AP and computer with modem devices requires the use of
straight-through cables between the APs and modems. Using modems requires
a telephone line for as long as the link remains active.