Lucent Technologies passageway service provider for merlin legend communications system Irq

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PC Serial Ports

The table below lists the default I/O port addresses and IRQs used by the serial ports of IBM-PC/AT-compatible computers:

Serial Port

I/O Port Address

IRQ

Device Name

 

 

COM1

03F8

4

COM2

02F8

3

COM3

03E8

4

COM4

02E8

3

 

 

 

The values in this table play an important part in understanding the "wrinkles" associated with serial ports: although there is provision for up to four serial ports, with four unique I/O addresses, there are only two unique IRQs associated with them (recall that most PCs require the IRQs used by each active device to be unique to avoid conflicts). To understand why, it is useful to recall what the PC world was like before the widespread availability of products like Windows.

When the architecture of the current generation of PCs was first being designed (for the IBM PC/AT), the concept of multitasking was not nearly as important in the PC marketplace as it is today. Consequently, since DOS (before Windows) did not permit multiple applications to run simultaneously (with the notable exception of certain specialized programs such as mouse drivers), there was little need to provide a mechanism by which several serial ports could be operated simultaneously. Consequently, the strategy used was to conserve IRQs by assigning the same IRQ to more than one COM port (that is, the COM1 and COM3 ports were both assigned to IRQ4, and the COM2 and COM4 ports were both assigned to IRQ3). Then, under the assumption that at most two serial ports would be active simultaneously (for example, COM1 and COM2, which have unique IRQs), conflicts would not occur.

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Contents Getting Started Your Responsibility for Your Systems Security Home Contents Installing the PassageWay Adapter With a Local Power Supply Figures Introduction What is the PassageWay Service Provider?About This Guide Merlin Legend Conventions Used in This Guide User ResponsibilitiesGetting Help Overview Installing and Configuring PassageWay Service2 ProviderNew PassageWay Solution Users Existing PassageWay Solution Users 1shows the components of the PassageWay adapter PassageWay Service Provider ComponentsComponents of the PassageWay Adapter PassageWay Service Provider Requirements Page Page Before You Begin Page Installing the PassageWay Adapter Wall Page Page Installing the Software Page Page Page Find PassageWay Link Dialog Box Page Page Sample PassageWay Configurator COM Port Dialog Box Merlin Legend System Version Dialog Box Telephone Models Dialog Box Sample Phone Line Information Dialog Box Choose Outside Line Page Page Page Removing the PassageWay Service Provider Windows Removing the PassageWay Service ProviderPage Page Troubleshooting Problem 1 a message box appears displaying the message General TroubleshootingProblem 2 a message box appears displaying the message Problem 3 a message box appears displaying the messageProblem 5 a message box appears displaying the message Problem 4 a message box appears displaying the messageProblem 6 a message box appears displaying the message Problem 7 a message box appears displaying the messageAnswering Calls Problem 1 You cannot answer calls via your Tapi applicationMaking Calls Problem 2 You cannot make calls via your Tapi applicationProblem 3 You cannot make a call with the speakerphone Conferencing Calls Placing Calls on HoldProblem 4 You are unable to use the Conference feature Transferring Calls Using the PassageWay Configurator PassageWay for Merlin Legend Problem 3 The PassageWay Link is not always detected Problem 4 Your COM serial port is not recognized Installing and Uninstalling the PassageWay ConfiguratorTroubleshooting PassageWay Adapter LED Problem 1 The LED is offProblem 1 Connect displays the message This application Troubleshooting the Connect ApplicationTroubleshooting Page Failure Code Failure Code -131, -132, -133,Failure Code -134 Failure Code Then terminates PC Serial Ports Background IRQ Mechanism Page IRQ Serial Ports Under Windows Workarounds and Solutions to IRQ Conflict Problem Page Page Selecting an Add-On Serial Port Card Page Installing the PassageWay Adapter with a Local PowerB Supply Installing the PassageWay Adapter with a Local Power Supply Installation Procedure Page IN-1 IndexIndex IN-2

passageway service provider for merlin legend communications system specifications

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