6-4
Netopia ISDN Modem User’s Guide
Using Multilink PPP
The Netopia ISDN Modem suppor ts Multilink PPP, which can link the
two ISDN B channels and allow a maximum digital connection of
128 Kbps. Multilink PPP is enabled by default.
If want to use Multilink PPP, make sure:
■
Multilink PPP is turned on in the Netopia ISDN Modem.
■
The serial por t of your PC or Macintosh computer suppor ts a
data transmission rate of at least 115.2 Kbps and you’ve set
the por t speed in your communications software to the
maximum available data rate.
■
Both the telephone company ser vice and the Internet Ser vice
Provider (ISP) or LAN dial-in ser vice suppor t two B channel
connections.
■
Both you and the destination you are calling are using software
that suppor ts PPP, such as Dial-Up Networking in Windows 95
or InterPPP and FreePPP in the Macintosh operating system.
The following registers control Multilink PPP and are set by your
configuration software:
■
S register 80 enables or disables Multilink PPP operation
■
S registers 82 and 83 control Multilink configuration
■
S register 70 controls Dynamic Bandwidth Allocation (DBA) in
Multilink mode
By default, the Netopia ISDN Modem dials the same number for
both Multilink PPP channels. If the destination requires a different
telephone number to establish a second Multilink PPP channel, then
you must include this second telephone number in the dial string.
The ampersand character (&) is used to dial two telephone
numbers: for example, ATD19085557891 & 19085555555
Note:
If you are using a Macintosh computer and a Model 411
Netopia ISDN Modem, star t up the ISDN Setup application and
enter the second telephone number (DN) in the Second DN field in
the Advanced window. (For more information,
see the “Second DN”
section on page 5-11.
)