®
3C
OM
I
MPACT
ISDN E
XTERNAL
D
IGITAL
M
ODEM
Q
UICK
S
TART
I
NSTRUCTIONS
Part Number 09-0700-002
The following information will help you install the 3Com
Impact
ISDN External digital modem models 3C871, 3C872,
3C876, or 3C877. Refer to the
3Com Impact ISDN External
Digital Modem User Guide
for additional information.
Site Preparation
The Basic Rate ISDN line and computer serial port must be
properly configured.
Ordering, Installing, and Configuring the ISDN Line
3Com has determined the optimal ISDN line configurations
for the 3Com Impact digital modem and has provided that
configuration data to many telephone companies. To simplify
the ordering process for an ISDN digital line, use the following
simplified ISDN ordering code:
3ComA * J6
If your digital modem has an internal analog fax modem
(Models 3C872 and 3C877), then two directory numbers
(telephone numbers) will be required to allow a voice call and
a fax modem call to occur at the same time. When you tell the
telephone company the ISDN ordering code (3ComA * J6) let
the representative know that you will need two directory
numbers.
If your telephone company does not support simplified ISDN
ordering codes, refer to Table 1 for ISDN ordering information.
An internal Network Termination Type 1 device (NT1) is built
into the 3Com Impact digital modem, so an external NT1 is
not usable. When the telephone company installs the ISDN
09-0700-002 Page 1 Sunday, December 22, 1996 3:40 PM
