ZyXEL Communications Prestige 480 - Manual (Page 92)

Prestige 480 Dual BRI ISDN Router
4-6 Remote Node Configuration
successful authentication, please make sure that you specify the correct authentication protocol when
connecting to such an implementation.
4.1.4 PPP Multilink
The Prestige uses the PPP Multilink Protocol (PPP/MP) to bundle multiple links in a single connection to
boost the effective throughput between two nodes. The bundle works best when the member links are of the
same type of call and at approximately the same speed.
Due to the fragmentation/reconstruction overhead associated with MP, you may not get a linear increase in
throughput when a link is added.
The number of links in an MP bundle can be statically configured, or dynamically determined at runtime, as
explained in the following section.
4.1.5 Bandwidth on Demand
The Bandwidth on Demand (BOD) feature adds or subtracts links dynamically according to traffic demand.
After the initial call, the Prestige uses BAP (Bandwidth Allocation Protocol) to ask the peer for an additional
telephone number if BACP (Bandwidth Allocation Control Protocol) is negotiated. Otherwise, the Prestige
uses the statically configured (primary and secondary) telephone numbers of the remote n ode.
The configuration of bandwidth on demand focuses on the Base Transmission Rate (BTR) and the Maximum
Transmission Rate (MTR). The relationship between BTR and MTR are shown next: