User guide

August 2001 131
Testing the E1 Setup
Testing the Application
There are four basic ways of testing your application:
Using AccuSpan
Placing calls over a live E1 line
Using an E1 simulator
Connecting trunks A and B (Loopback)
Using AccuSpan
AccuSpan is the best way to test the overall robustness and
fault tolerance of your system. AccuSpan is a command line
utility that gives you full control over the carrier configuration,
alarms, and bit patterns sent and received. It can also receive or
generate calls. By changing the carrier parameters such as clock
settings, line coding methods, or CRC transmission, you can test
different scenarios for your application. You can also transmit
alarm conditions to see how the remote end responds. To use
AccuSpan, connect two back to back computers with one
running the application and the other running AccuSpan.
The most powerful feature that AccuSpan provides for
exception-handling tests is signaling mode. In signaling mode
you can transmit any possible bit pattern to the application,
where the received bit pattern is always shown on screen. By
sending certain bit patterns at specific times you can manually
generate all events the protocol supports, such as line seizure,
answer, or disconnect. You can than send valid events at invalid
times, send invalid bit patterns at several different states of the
call progress, or send signals that are too long or too short and
check how the application responds. Using signaling mode
requires a good understanding of the protocols. If you are not
already familiar with the protocols, view the bit patterns sent or
received on the line during normal operation to see how the
protocol operates.