isdndemo program structure and coding

isdndemo is a single-threaded C++ application consisting of global functions and classes. The following table lists the global functions found in the isdndemo.cpp file:

Function

Description

cta_error_handler

Processes Natural Access errors.

dfprintf, dvprintf

Provides conditional program output.

error

Provides critical application error notification.

error_cta

Provides output of Natural Access codes in text form.

getACU, getACUERR

Converts some constants to text form.

main

Provides a program entry point, performs processing of program-wide command line arguments, and initializes Natural Access and program classes.

readConfig

Creates a program object hierarchy based on command line arguments.


The global classes used with isdndemo are found in several files. The following table lists each class along with its associated file and description:

Class

File

Description

BChannel

BChannel.cpp

Specifies a context class that represents the ISDN B channel.

Board

Board.cpp

Provides access to information about NMS boards.

Call

Call.cpp

Specifies an object that represents a single NMS ISDN call.

Context

Context.cpp

Implements a single-threaded program model and a generic mechanism for processing Natural Access events.

DChannel

DChannel.cpp

Specifies a context class that represents the ISDN D channel.

NAI

NAI.cpp

Specifies an object that represents board trunks (or NAI in NFAS terminology) associated with BChannel and Call objects.

Timer

Timer.cpp

Implements a synchronous timer based on the asynchronous ADI timer.


The following illustration shows how isdndemo functions and classes are related:

isdndemo_object_hierarchy.gif