ZyXEL Communications ACCESSING INTERNET & INTRANET omni series - Manual (Page 59)

Point-to-Point Protocol (PPP) 47
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 channel into one PPP link for higher
throughput. It must be negotiated in the link establish phase by both
peers. If Multilink PPP is negotiated successfully, the second link will
be dialed after the first link reach 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.
Related commands:
•
AT&J3 - Enable Multilink PPP.
•
ATDI[+] - 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.
•
ATEPDn = - Set End Point Discriminator (EPD) for
class n (0-5). I is not required to change the default settings in
most cases unless your ISP provides these values.
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 drops
one of the channels automatically and uses it for voice calls. Once a
voice call ends, the TA automatically reestablishes the channel. For
fully disconnecting with the central switch, there is a delay time
between on-hook phone and channel reestablishment. The delay for
reestablishing the channel is 10 seconds. During call bumping, the