User manual

Campus-RS Fractional Interface Card User Manual 7-1
7
TESTING THE SYSTEM
The Fractional Interface Card supports a complete set of loopback functions
that allow you to test the data communication path between the host
equipment, the Campus unit, and the remote unit. You can use the LCD and
menu buttons or an ASCII terminal to initiate loopback tests.
To initiate a loopback from the LCD, see “Configuring Loopbacks” on
page 4-20. To use an ASCII terminal to initiate a loopback, see “Configuring
Loopbacks” on page 5-28.
Initiating a loopback test interrupts normal system operation and the TEST
LED on the desktop unit or line unit front panel flashes. When the loopback
is cancelled, the system returns to normal operation automatically.
TYPES OF LOOPBACKS
There are four loopback tests you can use with the Fractional Interface Card.
Each tests a different portion of the communication path, which lets you
isolate communication problems. For each test, the terms “local” and
“remote” are relative to the Campus unit from which you initiate the loopback
test. The Fractional Interface Card supports the following loopback tests:
• Local to Local Interface
• Remote to Local Interface
• Remote to Remote Interface
• Local to Remote Interface