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XEISDNS

ISDN Terminal Adapter Module with S/T Interface and Channel Bonding

Xecom 

Modes of Operation

Application Mode

The normal mode of operation of the XEISDNS is Application Mode. This would typically be the only mode vis-

ible to the equipment end user. When the CFG/SDO (pin 10) is pulled high, the XEISDNS module is in the Appli-

cation mode. The ISDN configuration and control program supplied by Xecom or the equipment designer’s spe-

cially developed control program will boot-up upon power-on. In this mode the control program can occupy up to

240K x 16 of the 256K x 16 Flash memory.

Development Mode (ISDN Monitor)

XEISDNS also provides a development tool for designers who wish to write their own firmware control code.

When the CFG/SDO (pin 10) is pulled low, the module will boot-up from the on board ISDN Monitor program.

The xecom ISDN Monitor has fifteen debugging commands including program downloading, memory contents dis-

play and Flash memory operation. The complete command set is listed in the Configuration Guide.

After the designer program has been developed and tested using the ISDN Monitor utility it can be downloaded

into non-volatile Flash memory. The module is then reconfigured to the Application Mode, and the program is

ready to run.

Configuration and Setup

An ISDN telephone line presents a significantly more powerful and complex interface to the user than a standard

analog (POTS) line. Unlike an analog line, the digital ISDN line requires special setup, demultiplexing, and signal

processing to separate its two 64k bps data channels (B channels) and its 16k bps signaling channel (D channel) at

the user interface. In order to establish a connection to an ISDN line, certain parameters must be exchanged be-

tween the telephone company switch and the local data communication equipment to initialize the call. It is as-

sumed here that the user has access to an already installed ISDN line and the configuration parameters (Dial Num-

bers, Service Profile Identifiers, Switch Type, Switch Version, Long Distance Carrier) provided by the phone com-

pany for that line. Further information on these parameters is contained in the Configuration Guide.

In addition to the remote switch configuration, the local terminal adapter (TA), like an analog modem, must be set

up properly to operate. There are several parameters which must be set compatibly at the TA and the switch to

specify the exact services to be provided over the line. These parameters will vary with the application. The

XEISDNS implements these functions based on setup information provided by the user. There are three methods

for configuration of the link.

AT Command Configuration

The most basic configuration technique is through AT commands. The user interface is similar to that of an analog

modem with an extended command set. The user communicates this information to the module through the RS-

232E serial port. A PC running standard VT100 compatible serial communications software is typically used for

this purpose. The AT command set of the XEISDNS is designed to enable configuration and testing for both the

remote switch and the terminal adapter.

Like an analog modem, the XEISDNS operates in two modes: data mode and command mode. In data mode the

device sends all data received at its data ports down the ISDN link. In command mode the TA interprets these in-

puts as configuration and setup commands and processes them locally. Commands are communicated to the TA

via its RS-232 serial interface from the local host processor. The TA enters command mode upon power-on, any

time the Escape command “+++” is received, or when a call is terminated.

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XEISDNS

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