RS-232 COM Port Pin Speciﬁcations | 3Com ISDN Modem guide

C-2 APPENDIX C: SPECIFICATIONS

RS-232 COM Port Pin Speciﬁcations

The asynchronous RS-232-D COM port on the 3C882 ISDN modem, labeled RS-232, is a standard DB-25 female connector. The 3C882 ISDN modem asynchronous port pin assignments, shown in Table C-1, conform to standard deﬁnitions for data communications equipment (DCE).

Table C-1 Pin Descriptions

Pin #	Pin Name	Signal Direction

1	Shield Ground (GND)	—
2	Send Data (SD)	To ISDN modem
3	Receive Data (RD)	From ISDN modem
4	Request to Send (RTS)	To ISDN modem
5	Clear to Send (CTS)	From ISDN modem
6	Data Set Ready (DSR)	From ISDN modem
7	Signal Ground (GND)	—
8	Carrier Detect (DCD)	From ISDN modem
18	Local Loopback	From ISDN modem
20	Data Terminal Ready	To ISDN modem
	(DTR)
21	Remote Loopback	To ISDN modem
22	Ring Indicator (RI)	From ISDN modem

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3Com ISDN Modem manual RS-232 COM Port Pin Speciﬁcations, Clear to Send CTS From Isdn modem

Contents

3COMIMPACTIQ External Isdn Modem User Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Limited Warranty YearPage Contents Configuration for AN Apple Macintosh Computer Call Forwarding AT&T 5ESS Custom Switch A-6 Placing Isdn Data Calls Specifications Registers Computer to 3C882 Isdn Modem COM Port Connection Conﬁguration for Two Telephone Numbers and Two Analog FreePPP Setup Screen 3C882 Conﬁguration Steps for a Macintosh Tables Text ConventionsPage Introduction How to Use This GuideAbout this Guide Appendix B Conventions Introduction 3C882 Isdn modem provides the following features 3C882 Isdn Modem FeaturesEasy Installation and Use Isdn Standards and Interface High PerformanceProtocols Ansi V.120 rate adaption 3C882 Isdn Modem Package Contents Before You Install the 3C882 Isdn Modem IBM PC or Compatible Requirements Apple Macintosh Requirements Isdn Information Isdn Information Sheet Introduction Installing the 3C882 Main hardware installation steps are depicted Green Familiarizing Yourself with the 3C882 Isdn ModemColor Description LED remains lit but does not flash Installing a Serial Cable You will need the following type of serial cable To install the 3C882 Isdn modem serial cable To install an analog device 1Installing the Isdn CableInstalling Analog Equipment Analog Equipment Connection Installing the Power Cable Power Cable Connection This completes the 3C882 Isdn modem installation Running Windows Configuration for ANIBM-COMPATIBLE PC Conﬁguring the 3C882 Isdn Modem for a PC Click OK Installing the 3C882 SoftwareTo install the 3C882 Isdn modem software Click OK to complete the installation Running the Spid Wizard Double-click the 3ComImpact IQ icon shown in Figure You will see a start message, as shown in Figure First Telephone Number Dialog Box for PC Appears Second Telephone Number Dialog Box for PC Click Finish Conﬁguration Dialog Box for PC Configuration for AN IBM-COMPATIBLE PC Running Windows Conﬁguring Multilink PPP Appears Click Finish Conﬁguring the B Channel Rate Conﬁguring Voice Call Routing 10 Voice Call Routing Default Setting One Telephone Number and Two Analog Devices 11 Conﬁguration for One Telephone Number and Two Devices Verifying the Conﬁguration Configuration for AN IBM-COMPATIBLE PC Running Windows Setup Using Windows 13 New Hardware Dialog Box Install From Disk dialog box appears, as shown 14 Install From Disk Dialog Box Setup Using Windows NT 3.5.1 RAS Check Show All Devices 16 Network Settings Dialog Box Remote Access Setup dialog box appears, as shown in Figure Remote Access Setup dialog box appears Setup for Windows NT Click Continue Setup for Windows NT 4.0 New Modem Manufacture screen will open, as shown in Figure 19 Modem Manufacturers and Models Dialog Box Dial Up Networking for Windows Dialog box indicates successful setup Click FinishConﬁgure Dial-Up Networking Click Finish Click Next to view the Connection Type dialog box Service Provider dialog box opens Dial-up Networking for Windows NT New Phonebook Entry screen opens, as shown in Figure 20 New Phonebook Entry Wizard 21 Phonebook Entry Screen Click the TCP/IP Settings button 3C882 Isdn modem allows for transfer rates of up to Setup for 230KbpsSetting up 230K for Windows NT Setting up 230K for Windows 95 and Windows NT Click Conﬁgure Select 3ComImpact IQ 230K 3C882 Isdn modem. This will set the baud rate to 230.4 Kbps Setup for 230Kbps Configuration for AN IBM-COMPATIBLE PC Running Windows Configuration for AN Apple Macintosh Computer Conﬁguring the 3C882 Isdn Modem for a Macintosh Computer Installation Message Box Message box appears as shown in Figure Click OK This completes the software installation Double-click the 3ComImpact IQ program icon shown in Figure Select Modem Port Screen Spid Wizard Start Screen First Telephone Number Screen for Macintosh Second Telephone Screen for Macintosh Quit. Click Quit to leave the Conﬁguration dialog box Conﬁguration Dialog Box for Macintosh Conﬁguring the B Channel Rate Conﬁguring Voice Call Routing RS-232 Layer 1 UP Spid 1 Init if required 12 Conﬁguration to ring both ports simultaneously Conﬁguring Internet Access for a Macintosh Computer Set Up Using OT/PPP and Open Transport Configuring Internet Access for a Macintosh Computer 14 OT/PPP Modem Control Panel 15 TCP/IP Control Panel Set Up Using FreePPP with Open Transport Click on the Accounts tab and select New Account screen will open as shown in Figure 17 FreePPP Account Screen 18 FreePPP Connection Screen Configuring Internet Access for a Macintosh Computer Choose FreePPP from the Connect via pop up menu 20 FreePPP TCP/IP Control Panel Advanced Configuration Advanced Conﬁguration Parameter Default Values QuickSelect Baud Rate Auto AnswerCompression Then press Enter or Return Changing the Parameter SettingsType Incoming Outgoing calls S70=3 Auto Answer Enabled %C2Autobaud Enabled $B0 Answer Advanced Configuration Supplementary Voice FeaturesSupplementary Voice Features Call Forwarding Then put on hold How to Use Call Waiting How Do Do ThisIsdn Call Waiting Call? Conference call? Press and release the switch hook button TroubleshootingHow to Use Call Conference How Do Do This Call Conference Call Drop Call Transfer Isdn Service from Paciﬁc Bell Switch back to the first call? This completes the procedure for Paciﬁc Bell Isdn users Placing Isdn Data Calls Placing and ReceivingCalls Placing Calls Automatically Placing Calls Manually Placing Multilink PPP Calls Placing a TollMizer Call Receiving Isdn Data Calls When the 3C882 Isdn modem receives a voice call, Placing Voice Calls Using an Analog Phone PortReceiving Voice Calls Using an Analog Phone Port Channels ﬂash and then remain lit Isdn Call Logging Troubleshooting Troubleshooting Monitoring the Test LED Checking the BasicsMonitoring LEDs Monitoring the SD LED Monitoring the D Channel LEDMonitoring the B Channel LEDs Monitoring the RD LED Evaluating Symptoms and Solutions Monitoring the DTR LED Line Service That your line is configured forCircuit-switched voice and data Switch type has been Upon power up Previous firmware Possible Cause Solution Connection hasLED remains lit Properly configured You receive a Lights Disabled Appropriate value. Refer to Symptom Possible Cause SolutionDoes not work By default S76=1. Use terminal Result Codes for the available options Microkey Error Codes Error Code Possible Cause Solution 1022 Restoring the 3C882 Isdn Modem to Autobaud Using On-Line Help Placing the Isdn Order Through Your Telephone Company Ordering Isdn ServicePlacing the Isdn Order Through 3Com Appendix a Ordering Isdn Service What Do I Need To Support Supplementary Voice Features? Isdn Line Parameter Tables AT&T 5ESS Switch NI1 Table A-2 Line Conﬁguration for AT&T 5ESS NI1 AT&T 5ESS Custom Switch NorthernTelecomDMS 100 Switch Table A-4 Line Conﬁguration for DMS Siemens Ewsd Switch Table A-5 Line Conﬁguration for Siemens Ewsd AT Commands REGISTERS, and Result Codes AT Command Set Host computer default Command state on detecting on-offCommand at any speed default Answer mode only Reset AT Z \T0 disables inactivity timer defaultInitial configuration set System reset Registers Registers except S0 are the 3Com extended registers Isdn Phone #1 calls blocked Phone #2 to Phone port 1 or DefaultPhone #1 calls blocked Phone #2 to Phone port 2 only S65 Isdn Call Logging for Voice Calls for Phone Port S75 Connection Delay Internet Protocol IP Address Public Switched Network Directory Number defaultLocally Assigned Address Ieee 802.1 Globally Assigned MAC Address Result Codes Table B-3 lists the 3C882 Isdn modem result codes Appendix B AT COMMANDS, S REGISTERS, and Result Codes Specifications 3C882 Isdn Modem Speciﬁcations RS-232 COM Port Pin Speciﬁcations Clear to Send CTS From Isdn modem Receive Data RD Send Data SD PC Serial Cable Pin SpeciﬁcationsMacintosh Serial Cable Pin Speciﬁcations Appendix C Specifications To copy the README.TXT ﬁle, at the C\3Com prompt, type Configuration UsingConﬁguration Using DOS Use the Space Bar to select the 3C882 Isdn modem’s COM port Configuration Using DOS Appendix D Configuration Using DOS Channel GlossaryAsync-Sync PPP Conversion Call Drop Chap COM port Layer FirmwareKbps Multilink PPP Plain old telephone service PAP Glossary Glossary Numerics Apple Macintosh requirements 1-6 Async-Sync PPP Data calls placing Pinout speciﬁcations C-2 compression 5-3 conﬁgurationFreePPP DTR LED monitoring Troubleshooting Environmental operating range C-1Setup For Northern Telecom DMS 100 A-7 for Siemens Ewsd A-8 LEDs B1 channel Ordering Isdn service Result codes B-9 Ringer equivalence number C-1 Warranty 1-4 Windows Plug and Play setup Windows NT 3.5.1 3-17 Windows NT 4.0 Page Limited Warranty 3Com Corporation Bayfront Plaza 3COM END User Software License Agreement For civilian agencies Interference Handbook Canadian Notice