Hayes Microcomputer Products PC Card - Manual (Page 11)

DIVA T/A PC Card Reference Guide 11
What is Multilink PPP?
The DIVA T/A serves as an intermediary between its host workstation
and the remote device to which data is being transmitted. All the
protocol processing required for the negotiation of a Multilink PPP
connection is performed on the DIVA T/A itself. The PC forwards
asynchronous PPP packets to the DIVA T/A which, in turn, converts
the packets for synchronous transmission and negotiates the various
authentications required to establish the Multilink PPP connection
with the target system over ISDN lines. This allows for the more
efficient use of the ISDN line without requiring any changes to the
PPP stack currently loaded on your PC.
While Multilink PPP effectively doubles the DIVA T/A's throughput
to 128 kbps, the DIVA T/A can support COM port bit rates as high as
512 kbps by enabling the Turbo Mode feature. Turbo Mode comprises
a set of proprietary DIVA T/A commands which permit the user to
specify throughput speeds in excess of the traditional terminal
emulation upper limit of 115200 bps. The Turbo Mode bit rate is set
using the AT%MT1 command (see page 35, for more on AT%MT1).