3Com 3C871 Quick Start Instructions

®

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