User manual

Configuring and Monitoring Through the LCD
4-20 Campus-RS Fractional Interface Card User Manual
CONFIGURING LOOPBACKS
Loopbacks provide a way to test the data communication path between the
Campus unit, the remote unit, and the remote host equipment. The
Campus-RS Fractional Interface Card supports four types of loopbacks:
• Local to Local Interface
• Remote to Local Interface
• Remote to Remote Interface
• Local to Remote Interface
See Chapter 7, “Testing the System” for a description of each of these
loopbacks.
Once a loopback condition has been initiated, it remains in effect until
cleared. You may also set a loopback timeout to clear the loopback
automatically after a set period of time has elapsed.
You manage loopbacks through the DIAGNOSTICS menu:
1 Press Escape until CAMPUS RS I/F: FRAC displays.
2 Press Next until DIAGNOSTICS displays, then press Enter.
LOOPBACK MODE displays.
The Campus-RS Fractional Interface Card also supports V.54 loopbacks. To
enable V.54 loopback support, see “Enabling V.54 Loopback Support” on
page 4-22.
The following sections describe how to initiate and clear loopbacks, and to
set a loopback timeout.
Initiating a Loopback
To initiate a loopback condition:
1 From the LOOPBACK MODE display, press Enter.
2 Press Next to scroll through the loopback options until the desired
loopback condition displays.
3 Press Enter to drop the HDSL link and initiate the loopback.
LOOPBACK MODE displays.