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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
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Chipset
| Unidentified
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Error Correction/Compression
| STAC
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ISDN Transfer Rate
| 56Kbps x 2/64Kbps x 2
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ISDN Protocol
| V.120, PPP
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Switch Type
| 5ESS, DMS100, EWSD, NI-1
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Data Bus
| Serial
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CONNECTIONS
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Function
| Label
| Function
| Label
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ISDN U interface
| CN1
| Analog adapter 2
| CN4
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Serial port
| CN2
| 9V DC power in
| CN5
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Analog adapter 1
| CN3
| Reset switch
| SW1
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DIAGNOSTIC LED(S)
|
LED
| COLOR
| STATUS
| CONDITION
|
PWR
| Green
| On
| Power is on
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PWR
| Green
| Off
| Power is off
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TEST
| Green
| On
| TA failed last test
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TEST
| Green
| Blinking
| TA is executing test
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TEST
| Green
| Off
| TA is not executing test
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D
| Green
| On
| Signal is not synchronized or ISDN is not connected
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D
| Green
| Blinking
| Signal is synchronized but D-channel protocols not established
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D
| Green
| Off
| Signal is synchronized
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B1
| Green
| On
| Data call connected on B1 channel
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B1
| Amber
| On
| Voice call connected on B1 channel
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B1
| Green
| Blinking
| TA is dialing data call on B1 channel
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B1
| Amber
| Blinking
| TA is dialing voice call on B1 channel
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B1
| N/A
| Off
| B1 channel is not connected
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SD
| Green
| On
| TA is transmitting data
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SD
| Green
| Off
| TA is not transmitting data
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RD
| Green
| On
| TA is receiving data
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RD
| Green
| Off
| TA is not receiving data
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TR
| Green
| On
| DTR signal is high
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TR
| Green
| Off
| DTR signal is low
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SUPPORTED STANDARD COMMANDS
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Basic AT Commands
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+++
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A, E, H, O, Q, V, W, Z
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&C, &D, &F, &W
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Extended AT Commands
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\Q, \T
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S-Registers
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S0
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Proprietary AT Command Set
ANALOG ADAPTER CALL ROUTING
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Format:
| AT [cmds] S63=n [cmds]
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Default:
| 15
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Range:
| 0 - 15
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Description:
| Selects which analog adapters may answer which calls.
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Bit
| Value
| Function
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0
| 0
| Calls to analog adapter 1 may not be answered by analog adapter 1.
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1 | Calls to analog adapter 1 may be answered by analog adapter 1.
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1
| 0
| Calls to analog adapter 1 may not be answered by analog adapter 2.
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1 | Calls to analog adapter 1 may be answered by analog adapter 2.
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2
| 0
| Calls to analog adapter 2 may not be answered by analog adapter 1.
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1 | Calls to analog adapter 2 may be answered by analog adapter 1.
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3
| 0
| Calls to analog adapter 2 may not be answered by analog adapter 2.
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1 | Calls to analog adapter 2 may be answered by analog adapter 2.
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