PassFinder AP2520 VoIP Router/Gateway Operation Manual
Version 1.10 / Mar. 2002
AddPac Technology Co., Ltd.
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70
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4.5.2.
PPP Configuration
Point to Point Protocol (PPP) is one of standard transmission rules to send data
through the WAN link. RFC1661 describes PPP specifications. Not only in the
synchronous WAN (serial) line but also in the asynchronous WAN (dial up line,)
PPP can be used. Since PPP is a standard rules, it guarantees compatibility
with different manufacturers’ devices.
PPP consists of two kinds of protocol as follows:
z
Link Control Protocol
(LCP): LCP decides the encapsulation format, limits
the packet size, performs authentication in the link, decides normal
operation time and breakdown time, detects loopback link faults and other
faults, and automatically terminates the link.
z
Network Control Protocol (NCP): NCP communicates with various higher
layer (network layer) protocol.
If a PPP encapsulation option is given to the PassFinder AP2520 router, PPP
operation is possible. Current software installed in the router supports
Challenge Handshake Authentication Protocol (CHAP,) the authentication
option that uses Password Authentication Protocol (PAP,) and the magic
number configuration option. Software always sends the magic number
configuration option. However, software sends the authentication option only
when the authentication option is set.
Information