3Com MIC-3365 User Manual

OM IMPACT

ISDN E

ODEM

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

Digital Modem User Guide

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:

XTERNAL DIGITAL

for additional information.

UICK START

3Com Impact ISDN External



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 ex ternal NT1 is not usable. When the telephone company installs the ISDN

3COM I

MPACT

ISDN E

XTERNAL DIGITAL MODEM QUICK START INSTRUCTIONS

line at your location, be sure it provides you with the following information. For future reference, write the information in the blank spaces.

ISDN Switch Type: Phone #1: SPID #1: Phone #2: SPID #2:

Table 1

(Local ISDN Directory Number 1)

(Service Profile Identifier Number 1)

(Local ISDN Directory Number 2)

(Service Profile Identifier Number 2) ___________________

ISDN Ordering Information by Switch Type

(See Table 1)

___________________ ___________________ ___________________ ___________________

ISDN Switch Type

ISDN Line Configuration Parameter



AT&T Custom

5ESS

Line Code 2B1Q (no NT1

required)

2B1Q (no NT1 required)

Northern Telecom DMS100 National ISDN-1

2B1Q (no NT1 required)



Siemens EWSD National ISDN-1

2B1Q (no NT1 required)

Numbers Channels

2B alternate circuit-switched data and voice

Terminal Type A with

Point-to-Point

2B alternate circuit-switched data and voice

A with Point-to-Point

2B alternate circuit-switched data and voice

Functional PVC 2 Functional

TEI Dynamic Dynamic Dynamic Dynamic Call

Idle Idle — —

Appearances Supplemental

None None None None

Voice Features EKTS Features No No No No D Channel

No No No No

Packet B Channel

No No No No

Packet

* Two directory numbers are required for Models 3C872 and 3C877. This allows a voice call and a

call using the internal analog fax modem to occur at the same time.

Installing the 3Com Impact Digital Modem

The 3Com Impact digital modem has an RS-232-C asynchronous interface port that operates at data rates of up to 115.2 Kbps. Some computers may need additional hardware or driver software for reliable operation.

IBM PCs and Compatible Computers

An IBM PC or compatible computer must have a buffered UART (universal asynchronous receiver/transmitter) chip, called



msd

) at the

the 16550 UART, to operate at 115 Kbps. Under Microsoft



Windows

, run the Microsoft Diagnostic Program ( DOS prompt and select COM Ports within msd. The UARTs present in your computer are listed under each COM port.

To operate at the maximum data rate, install an enhanced 16550 UART expansion card in your PC. If you have a nonupgradable PC with a slower UART (16450 or 8250), the 3Com Impact digital modem can operate at lower data rates, since it automatically adjusts to the PC serial COM port data rate. The COMM.DRV driver for Windows 3.1 only allows data rates of up to 38.4 Kbps. If you have a UART that supports higher rates than this (for example, 16550), you must install the



TurboCom

enhanced driver that is provided with the digital

modem.

Apple Macintosh Computers

Motorola

68XXX-based Macintosh



systems support a



maximum asynchronous serial port data rate of 57.6 Kbps.



Power Macintosh

computers may operate at higher serial

port data rates.

Installing the 3Com Impact Digital Modem

Follow the appropriate procedure for installing the 3Com Impact digital modem in your computer. Refer to Figure 1 during the installation procedure.

3COM I

MPACT

ISDN E

XTERNAL DIGITAL MODEM QUICK START INSTRUCTIONS

Power 12V AC RS232D

Figure 1

3Com Impact Digital Modem Rear Panel

RS232D

Wall

ISDN BRI-U ONLY

Installing the Digital Modem in an IBM-compatible PC

To install the 3Com Impact digital modem in an IBM or compatible PC, follow these steps:

Turn off the computer.

Insert the 9-pin male end of the 3Com Impact digital modem-to-PC serial signal cable into the connector labeled Computer on the digital modem’s back panel and tighten the connector screws.

Connect the other end of the 3Com Impact digital modem-to-PC serial signal cable to a serial communications (COM) port on the back of your PC and tighten the connector screws.

Connect the 3Com Impact digital modem power cable to the connector marked 12V AC on the back panel of the digital modem.

Plug the transformer end of the power cable into a standard 117V ac wall outlet.

Connect the RJ-45 (8-pin) connector end of the RJ-45/RJ-11 ISDN cable to the RJ-45 connector labeled Wall on the digital modem’s back panel.

Connect the RJ-11 (6-pin) connector end of the RJ-45/RJ-11 ISDN cable to the RJ-11 telephone ISDN jack.

Installing the 3Com Impact Digital Modem

CAUTION:

The 3Com Impact digital modem is designed to

operate with Basic Rate ISDN 2B1Q U Interface network terminations. An internal Net work Termination device (NT1) is built into the digital modem. D o not connect the 3Com Impact digital modem ISDN port to a standard analog telephone jack or to an external NT1 device. Make sure that it is connected to the ISDN jack.

Turn on the 3Com Impact digital modem by toggling the power switch on the back panel to the On position.

Turn on the computer’s power switch.

Go to the section “Conﬁguration for IBM PC or Compatible Computer” to conﬁgure the 3Com Impact digital modem for your computer.

Installing the Digital Modem in an Apple Macintosh Computer

To install the 3Com Impact digital modem in an Apple Macintosh computer, follow these steps:

Turn off the computer.

Insert the 9-pin male end of the 3Com Impact digital modem-to-Macintosh serial signal cable into the connector labeled Computer on the digital modem’s back panel and tighten the connector screws.

Connect the other end of the 3Com Impact digital modem-to-Macintosh serial signal cable to the serial communications port on the back of the Macintosh.

The serial communications port is the mini-DIN, 8-pin serial port connector, indicated on the Macintosh connector panel by the telephone handset imprint.

Connect the 3Com Impact digital modem power cable to the connector marked 12V AC on the back panel of the digital modem.

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