ZyXEL Communications Prestige 128Plus, User Manual, Page: 79 / 203

Prestige 128+ ISDN Router
Remote Node Configuration 4-7
4.1.3 Outgoing Authentication Protocol
Generally speaking, you should employ the strongest authentication protocol
possible, for obvious reasons. However, some vendor’s implementation includes
specific authentication protocol in the user profile. It will disconnect if the
negotiated protocol is different from that in the user profile, even when the
negotiated protocol is stronger than specified. If you encounter the case where the
peer disconnects right after a 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 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 node.