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Micro House PC Hardware Library Volume II: Network Interface Cards And Modems Micro House PC Hardware Library Volume II: Network Interface Cards And Modems
by Micro House International, Inc. and Scott Mueller
Que, Macmillan Computer Publishing
ISBN: 078971664x   Pub Date: 06/17/98
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Chapter 2
Modem Settings and Configuration

Modems may have numerous switches or jumpers used to configure the hardware as desired. This chapter provides hardware settings for many of the most popular modems produced.

With the proliferation of various types of peripherals for personal computers, the potential for encountering resource conflicts has become more pronounced. The following sections explain the purpose of commonly encountered switches and jumpers, and their recommended settings.

In order to avoid resource conflicts and aid in troubleshooting problems, be sure to keep a record of the current hardware settings of all peripheral devices installed in a system.

COM Ports and IRQs

Chapter One contains extensive information on COM ports and IRQs. Be sure to consult the documentation of all peripherals in your system in order to avoid a system resource conflict.

Command Sets and Result Codes

Along with the tables listing the hardware configuration settings for each modem, supported standard AT commands, proprietary AT commands, and S-registers are also listed. For a complete description of the standard Hayes AT command set which is used by most modems as well as the Hayes S-register listing, see appendix B. Appendix B also lists the proprietary AT command set for the popular U.S. Robotics (now 3Com) line of modems.

3COM CORPORATION

3COMIMPACT IQ (3C882)

Card Type ISDN TA
Chipset Unidentified
Error Correction/Compression STAC
ISDN Transfer Rate 56Kbps x 2/64Kbps x 2
ISDN Protocol V.120, PPP
Switch Type 5ESS, DMS100, EWSD, NI-1
Data Bus Serial

CONNECTIONS
Function Label Function Label
ISDN U interface CN1 Analog adapter 2 CN4
Serial port CN2 9V DC power in CN5
Analog adapter 1 CN3 Reset switch SW1

DIAGNOSTIC LED(S)
LED COLOR STATUS CONDITION
PWR Green On Power is on
PWR Green Off Power is off
TEST Green On TA failed last test
TEST Green Blinking TA is executing test
TEST Green Off TA is not executing test
D Green On Signal is not synchronized or ISDN is not connected
D Green Blinking Signal is synchronized but D-channel protocols not established
D Green Off Signal is synchronized
B1 Green On Data call connected on B1 channel
B1 Amber On Voice call connected on B1 channel
B1 Green Blinking TA is dialing data call on B1 channel
B1 Amber Blinking TA is dialing voice call on B1 channel
B1 N/A Off B1 channel is not connected
SD Green On TA is transmitting data
SD Green Off TA is not transmitting data
RD Green On TA is receiving data
RD Green Off TA is not receiving data
TR Green On DTR signal is high
TR Green Off DTR signal is low

SUPPORTED STANDARD COMMANDS
Basic AT Commands
+++
A, E, H, O, Q, V, W, Z
&C, &D, &F, &W
Extended AT Commands
\Q, \T
S-Registers
S0

Proprietary AT Command Set

ANALOG ADAPTER CALL ROUTING
Format: AT [cmds] S63=n [cmds]
Default: 15
Range: 0 - 15
Description: Selects which analog adapters may answer which calls.
Bit Value Function
0 0 Calls to analog adapter 1 may not be answered by analog adapter 1.
1Calls to analog adapter 1 may be answered by analog adapter 1.
1 0 Calls to analog adapter 1 may not be answered by analog adapter 2.
1Calls to analog adapter 1 may be answered by analog adapter 2.
2 0 Calls to analog adapter 2 may not be answered by analog adapter 1.
1Calls to analog adapter 2 may be answered by analog adapter 1.
3 0 Calls to analog adapter 2 may not be answered by analog adapter 2.
1Calls to analog adapter 2 may be answered by analog adapter 2.


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