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Omni.Net Lite User's Guide
Figure 5 Point-to-Point Link Pathway
2.4.2 Multilink PPP (MP or MLP)
There are two B channels in basic rate ISDN. This offers the possibility of opening multiple
simultaneous channels between systems giving users additional bandwidth on demand.
Multilink PPP is a method for bundling both B-channels into one PPP link for higher
throughput.
Multilink PPP must be negotiated in the establish-link phase by both peers. If the negotiation
is successful, the second link will be dialed after the first link reaches network phase. In some
countries the directory number is not the same for both channels. For dialing the second B-
channel with a different directory number, both numbers must be obtained before dialing out
unless the peer supports BACP and BAP, which will be described later in this chapter.
Multilink PPP is described in RFC-1990.
2.4.3 BACP and BAP
Bandwidth Allocation Control Protocol (BACP) and Bandwidth Allocation Protocol (BAP) is
used for call request and link drop under Multilink PPP.
BACP is negotiated during the network phase. Without BACP/BAP, the directory numbers of
both B-channels must be specified before dialing out. In some cases, it is not possible for the
ISP to support more than one chassis that is capable of bundling both channels at the same
time. With BACP/BAP, the second B-channel directory number can be obtained while
requesting a call. The second directory number is not necessary any more.
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Chapter 2 Using the Utility
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