User manual

Testing the System
7-4 Campus-RS Fractional Interface Card User Manual
CANCELLING LOOPBACKS
There are two ways to cancel a loopback test:
• cancel the loopback manually
• set the Loopback Timeout option to cancel the loopback after a set period
of time
Cancelling Loopbacks Manually
You can cancel a loopback from either the LCD or an ASCII terminal. To use
the LCD, see “Configuring Loopbacks” on page 4-20. See “Configuring
Loopbacks” on page 5-28 to use an ASCII terminal.
Loopback Timeout
When using a loopback, there is a possibility that it will be forgotten. If this
happens, the communication link remains down. To prevent this from
happening, you can set the Loopback Timeout configuration option. There
are four different settings for this option:
• None
• 20 Minutes
• 60 Minutes
• 120 Minutes
This option determines how long a loopback remains active. When the
Loopback Timeout option is set to one of the above values, the loopback is
cancelled and normal communication is resumed after the set time has
elapsed. If you set this option to None, the loopback remains in effect until
you cancel it manually.
To set the Loopback Timeout through the LCD, see “Setting the Loopback
Timeout” on page 4-21. To use an ASCII terminal, refer to “Setting the
Loopback Timeout” on page 5-30.