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Chapter 7. Protocol Options
61202.029L2-1 ISU 128 User Manual 57
The ISU 128 is configured for multilink PPP from the protocol options of the
configuration menu by selecting 2=Multilink PPP or by setting S-register S27
to a value of 1. In this mode, the ISU 128 dials a second number to establish a
second point-to-point link. Once the second link is established, multilink PPP
is performed over both B-channels.
The phone number for the second call should be placed in stored number 1
(SN1). If no number is stored in SN1, the same phone number is dialed to es-
tablish the second link.
PPP with Compression
The ISU 128 is configured for PPP with compression from the protocol options
of the the configuration menu by selecting 3=PPP w/Comp or by setting S-reg-
ister S27 to a value of 2.
When setup for PPP with compression, the ISU 128 will negotiate the compres-
sion control protocol (CCP) with the network PPP peer. If STAC™ compres-
sion is successfully negotiated with the peer, data packets from the DTE are
compressed before being sent out through the network. Likewise, compressed
packets from the network are decompressed before being transmitted through
the DTE.