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Technical Reference for ZyXEL omni.net series
7-4
Compression Control AT Commands Description
AT&K00
Disable CCP negotiation (default).
AT&K44
Enable CCP negotiation.
Table 37. Compression Control AT Commands
Multilink PPP
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/BAP, which will be described later in this chapter. Multilink PPP is described in
RFC1990.
CCP AT Commands Description
AT&J3
Enable Multilink PPP.
ATDI<num1>[+<num2>]
Dial Multilink PPP with num1 twice or with num1 and num2 if they differ.
ATS61.3 = 0
Use rotate method to bundle both channels (default).
ATS61.3 = 1
Use split method to bundle both channels.
Table 38. CCP AT Commands
Call Bumping
You can place or answer a voice call from a device that is attached to one of the POTS ports while
Multilink PPP is active. The omni.net automatically drops one of the channels and assigns it to
voice calls. Once a voice-call ends, the omni.net automatically re-establishes the channel.
When fully disconnecting with the central switch, there is a 10-seconds time delay between
on-hook phone and channel re-establishment. During call bumping, the traffic for BOD is still