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3Com 3C871 Quick Start Instructions

3C872 3C876 3C877

Made by: 3Com
Type: Quick Start Instructions
Category: Modem
Pages: 15
Size: 0.31 MB

 

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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

 


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

 

Table 1   

 

ISDN Ordering Information by Switch Type

 

* 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.

 

ISDN Switch Type: 

 

(See Table 1)

___________________

 

Phone #1: 

 

(Local ISDN Directory Number 1)

___________________

 

SPID #1: 

 

(Service Profile Identifier Number 1)

___________________

 

Phone #2: 

 

(Local ISDN Directory Number 2)

___________________

 

SPID #2: 

 

(Service Profile Identifier Number 2)

___________________

 

ISDN Switch Type

ISDN Line 
Configuration 
Parameter

AT&T

 

 

 

5ESS 

Custom

AT&T 5ESS 
National 
ISDN-1

Northern 
Telecom

 

 

 

DMS100 
National 
ISDN-1

Siemens

 

 

 

EWSD 
National 
ISDN-1

 

Line Code

2B1Q (no NT1 
required)

2B1Q (no NT1 
required)

2B1Q (no NT1 
required)

2B1Q (no NT1 
required)

Directory 
Numbers

1

 

*

 

1

 

*

 

2

1

 

*

 

Channels

2B alternate 
circuit-switched 
data and voice

2B alternate 
circuit-switched 
data and voice

2B alternate 
circuit-switched 
data and voice

2B alternate 
circuit-switched 
data and voice

Terminal Type

A with 
Point-to-Point 

A with 
Point-to-Point 

Functional PVC 2 Functional

TEI

Dynamic

Dynamic

Dynamic

Dynamic

Call 
Appearances

Idle

Idle

Supplemental 
Voice Features

None

None

None

None

EKTS Features

No

No

No

No

D Channel 
Packet

No

No

No

No

B Channel 
Packet

No

No

No

No

 

09-0700-002  Page 2  Sunday, December 22, 1996  3:40 PM

 


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Installing the 3Com Impact Digital Modem

 

3

 

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

 

 

 

Windows

 

 

, run the Microsoft Diagnostic Program (

 

msd

 

) at the 

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.

 

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Figure 1   

 

3Com Impact Digital Modem Rear Panel

 

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:

 

1

 

Turn off the computer.

 

2

 

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.

 

3

 

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. 

 

4

 

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

 

5

 

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

 

6

 

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.

 

7

 

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

Power

12V AC

RS232D

Wall

ISDN  BRI-U ONLY

RS232D

 

09-0700-002  Page 4  Sunday, December 22, 1996  3:40 PM

 


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Installing the 3Com Impact Digital Modem

 

5

 

CAUTION:

 

 

The 3Com Impact digital modem is designed to 

operate with Basic Rate ISDN 2B1Q U Interface network 
terminations. An internal Network Termination device (NT1) is 
built into the digital modem. Do 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.

 

8

 

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

 

9

 

Turn on the computer’s power switch.

 

10

 

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:

 

1

 

Turn off the computer.

 

2

 

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.

 

3

 

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.

 

4

 

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

 

09-0700-002  Page 5  Sunday, December 22, 1996  3:40 PM

 


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5

 

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

 

6

 

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.

 

7

 

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

 

CAUTION:

 

 

The 3Com Impact digital modem is designed to 

operate with Basic Rate ISDN 2B1Q U Interface network 
terminations. An internal Network Termination device (NT1) 
is built into the digital modem. Do 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.

 

8

 

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

 

9

 

Turn on the computer’s power switch and restart.

 

10

 

Go to the section “Configuration for Apple Macintosh 
Computer” to configure the 3Com Impact digital modem for 
your computer.

 

Configuring the 3Com Impact Digital Modem

 

The 3Com Impact digital modem requires the five essential 
configuration parameters below before it can operate 
properly on an ISDN line. Before configuring the digital 
modem, make sure you have this information readily 
available. These five parameters are provided to you at the 
time of installation of your ISDN line by the telephone 
company installer. 

 

 

ISDN Switch Type

 

 

Phone #1 (local directory telephone number)

 

 

SPID #1 (Service Profile Identifier)

 

09-0700-002  Page 6  Sunday, December 22, 1996  3:40 PM

 


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Configuring the 3Com Impact Digital Modem

 

7

 

 

Phone #2 (if required by the telephone company)

 

 

SPID #2 (if required by the telephone company)

Each of these items is stored in special S registers within the 
digital modem. These S registers are set by issuing ATSxx= 
commands to the digital modem. The 3Com Impact digital 
modem software will automatically issue the AT commands
to set the S registers as part of the configuration process.

The following three sections describe how to configure the 
3Com Impact digital modem using the Windows, DOS, or 
Macintosh operating systems, respectively.

 

After you configure the digital modem and verify that it is 
working properly, you should install the TurboCom software. 
Refer to the installation instructions that came with the 
TurboCom software. This software is required only for 
IBM PC or compatible computers running Windows 3.X.

 

Configuration for IBM PC or Compatible Computer

 

You can configure the 3Com Impact digital modem for
an IBM PC or compatible using either the Windows-based 
installation program or the MS-DOS

 

 

–based installation program. 

 

Configuration Using Windows

 

To configure the digital modem for an IBM PC or compatible 
computer using Windows:

 

1

 

Insert the 3Com Impact DOS & Windows Installation 
Diagnostic Utilities diskette into an available diskette drive.

 

2

 

Select Run from the File menu. In the Run dialog box, type:

 

a:setup

 

The check box labeled Run Minimized should be left 
unchecked.

 

3

 

Click OK.

 

The installation process begins copying the configuration 
program to the hard disk. A message box provides the status
of the installation and indicates when it is complete.

 

09-0700-002  Page 7  Sunday, December 22, 1996  3:40 PM

 


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4

 

Double-click the 3Com Impact icon to access the 3Com 
Impact Configuration dialog box.

 

COM1 is the default COM port.

 

 

If the digital modem is connected to COM1, the 3Com 
Impact Configuration dialog box appears, as shown in 
Figure 2. Go on to step 5.

 

 

If the digital modem is not connected to COM1, the
COM Port Provisioning dialog box appears. Choose the 
COM port to which the digital modem is connected. Click 
Connect. The 3Com Impact Configuration dialog box 
appears, as shown in Figure 2.

 

Figure 2   

 

Configuration Dialog Box

 

A status bar below the Help, Tools, Configure, and Exit 
buttons provides the following ISDN status information:

 

 

Layer 1 status

 

 

Service Profile Identifier (SPID) for telephone numbers 1 and 2

 

 

Terminal Endpoint Identifiers (TEI) 1 and 2 (for information 
purposes only)

 

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Configuring the 3Com Impact Digital Modem

9

A message bar at the bottom of the dialog box provides help 
for completing the fields. If you click in a field, the message 
bar tells you what information to enter in the field. The 
message bar also provides status information about the 
digital modem. If the digital modem is disconnected from 
the ISDN telephone line, for example, a message indicates 
this condition.

The right side of the dialog box shows the digital modem 
software version, along with any installed options (such as 
Multilink PPP or internal analog fax modem).

Select the type of switch, as specified by your telephone 

company, from the Telephone Company Switch 
drop-down list box.

Click in the Telephone Number field in the Number 1 area 

and enter the telephone number to which your digital 
modem is connected.

Click in the Service Profile Identifier (SPID) field and enter 

the corresponding SPID for the telephone number you 
entered in the previous step. 

You should have received this SPID from your telephone 
company. 

CAUTION: If the ISDN line has been configured with only one 
telephone number (Point-to-Point), do not include the SPID.

Specify which device should receive the calls coming to 

Telephone Number 1.

You can select Phone Port or Internal Fax/Modem. If your 
model has the internal analog fax modem installed
(Models 3C872 and 3C877), you can select both.

If both boxes are checked, the internal analog fax modem and 
the phone will both ring, enabling you to answer using either 
device.

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If you have a second telephone number associated with 

your ISDN telephone line (some telephone companies 
require two), enter the number and corresponding SPID in 
the appropriate fields in the Number 2 area.

10 Specify which device should receive the calls coming to 

Telephone Number 2. 

11 Click the Configure button to download the parameters 

listed in steps 5 through 10 to your digital modem’s
S registers.

12 If you have changed the Telephone Company Switch type, 

you must reset the digital modem by turning the power 
switch off and then on.

13 Verify the configuration.

Check the status bar (located beneath the Help, Tools, 
Configure, and Exit buttons of the Configuration dialog box) 
to verify correct configuration. If the parameters were 
configured accurately and the digital modem is ready to 
send and receive calls, the status bar fields will appear as 
shown below. Note that the TEI number(s) are not configured 
by the user. The TEI number is provided by the telephone 
company for informational purposes only.

Layer 1: UP

SPID 1: Init

TEI 1: Number from 0 to 127

SPID 2: Init (if required)

TEI 2: Number from 0 to 127 (if required)

14 Click Exit to leave the utility.

This completes the configuration procedure. 

15 Install the TurboCom software.

Refer to the installation instructions that came with the 
TurboCom software.

,

09-0700-002  Page 10  Sunday, December 22, 1996  3:40 PM

 


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Configuring the 3Com Impact Digital Modem

11

After the TurboCom software is installed, proceed to the 
“Placing and Receiving Calls” section in Chapter 2 of the 
3Com Impact ISDN External Digital Modem User Guide.

Configuration Using DOS

To configure the digital modem for an IBM PC or compatible 
computer using DOS:

Create a directory on the hard drive, insert the 3Com 

Impact DOS & Windows Installation Diagnostic Utilities 
diskette into the PC’s diskette drive, and copy all the files 
from the utility diskette to the hard drive. 

Copy the files to a new DOS directory. For example, to create a 
directory dddd on your C drive at the C:\> DOS prompt, type:

md c:\dddd

To copy all files from the diskette to a directory \dddd at the 
A:\> DOS prompt, type:

copy a:*.* c:\dddd

Execute INSTALL from the hard drive.

At the C:\> DOS prompt, type:

INSTALL

The configuration program launches and presents the
Port Settings screen. To move the cursor around the screen, 
use the [Up Arrow] and [Down Arrow] keys. To select a 
parameter, use the [Space Bar]. 

Use the [Space Bar] to select the digital modem’s

COM port and COM port data rate. 

This sets the speed of communication between the
3Com Impact digital modem and the computer during 
configuration.

When you select the port, the standard interrupt (IRQ) 
associated with that port is automatically chosen. Select the 
COM port data rate based on the data rate required by the 
destination digital modem and the maximum data rate 
supported by your computer’s COM port. 

09-0700-002  Page 11  Sunday, December 22, 1996  3:40 PM

 


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The program does not allow you to select a data rate that 
exceeds the speed of your COM port. 

Press [F10] to connect to the 3Com Impact digital modem 

via the chosen COM port.

The Configuration screen will appear.

In the Phone #1 field, enter the telephone number to 

which your digital modem is connected.

Enter the corresponding Service Profile Identifier (SPID) in 

the SPID #1 field for the telephone number you entered in 
the previous step. 

You should have received this SPID from your telephone 
company. 

CAUTION: If the ISDN line has been configured with only one 
telephone number (Point-to-Point), do not include the SPID.

Specify which device should receive the calls coming to 

Phone #1.

You can select Phone Port or Internal Fax/Modem. If your 
model has the internal analog fax modem (Models 3C872 
and 3C877), you can select both. The Phone Port and Internal 
Fax/Modem check boxes associated with Phone #1 appear 
to the right of Phone #1.

If both boxes are checked, the internal analog fax modem 
and the phone will both ring, enabling you to answer using 
either device.

If you have a second telephone number associated with 

your ISDN telephone line (some telephone companies 
require two), enter the number and corresponding SPID in 
the Phone #2 and SPID #2 fields.

Specify which device should receive the calls coming to 

Phone #2.

09-0700-002  Page 12  Sunday, December 22, 1996  3:40 PM

 


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Configuring the 3Com Impact Digital Modem

13

10 Confirm that the parameters listed in steps 5 through 9 

are correct.

When these parameters are updated, the information is read 
back to the screen. Check to see that the values have been 
correctly entered.

11 Press [F10] to update the information in the 3Com Impact 

digital modem.

12 Reset the digital modem by turning the power switch off 

and then on again.

If the parameters match those registered at the telephone 
company ISDN switch, the D channel LED lights for a few 
minutes, flashes for several seconds, and then turns off. If the 
LED continues to flash or remains lit, see Chapter 3, 
“Troubleshooting,” in the 3Com Impact ISDN External Digital 
Modem User Guide
.

13 Press [Esc] to return to the main menu.

Once in the main menu, exit the program.

14 Go to the section “Placing and Receiving Calls” in

Chapter 2 of the 

3Com Impact ISDN External Digital 

Modem User Guide to place your first call.

Configuration for Apple Macintosh Computer

To configure the digital modem for an Apple Macintosh 
computer:

Insert the 3Com Impact Installer Diagnostic Utilities 

software utility diskette into the diskette drive and copy 
the files by selecting them and dragging them to the 
hard drive icon.

The Macintosh operating system automatically places the 
files in the appropriate folders.

Open the 3Com Impact Mac folder and double-click the 

3Com Impact Installer program icon to launch it. 

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The utility program presents the Port Settings screen. To 
move the cursor around the screen, use the [Tab] key. Select 
the Modem port and click OK. The Utility dialog box appears.

In the Phone Number 1 field, enter the telephone number 

to which your digital modem is connected.

Enter the corresponding Service Profile Identifier (SPID) in 

the SPID field for the telephone number you entered in 
the previous step. 

You should have received this SPID from your telephone 
company. 

CAUTION: If the ISDN line has been configured with only one 
telephone number (Point-to-Point), do not include the SPID.

Specify which device should receive the calls coming to 

Phone Number 1.

You can select Phone Port or Internal Fax/Modem. If your 
model has the internal analog fax modem installed
(Models 3C872 and 3C877), you can select both.

If both boxes are checked, the internal analog fax modem 
and the phone will both ring, enabling you to answer using 
either device.

If you have a second telephone number associated with 

your ISDN telephone line (some telephone companies 
require two), enter the number and corresponding SPID in 
the Phone Number 2 and SPID Number 2 fields.

Specify which device should receive the calls coming to 

Phone Number 2.

Confirm that the parameters listed in steps 3 through 7 

are correct.

Click the Update Configuration button to update this 

information to the 3Com Impact digital modem.

09-0700-002  Page 14  Sunday, December 22, 1996  3:40 PM

 


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Configuring the 3Com Impact Digital Modem

15

10 Reset the digital modem by turning the power switch off 

and then on again.

If the parameters match those registered at the telephone 
company ISDN switch, the D channel LED lights for a few 
minutes, flashes for several seconds, and then turns off. If the 
LED continues to flash or remains lit, see Chapter 3, 
“Troubleshooting,” in the 3Com Impact ISDN External Digital 
Modem User Guide
.

11 Go to the section “Placing and Receiving Calls” in

Chapter 2 of the 

3Com Impact ISDN External Digital 

Modem User Guide to place your first call.

09-0700-002  Page 15  Sunday, December 22, 1996  3:40 PM