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Setting Port and Clock Modes
Loopback Mode
Loopback mode is a transmission state in which the signal
received by the port is returned to the sender. Use this mode
when the remote end (the Telco, for example) is testing your
line; all information sent is returned to the remote end.
Two loopback settings are available:
• Line loopback—The signal returned to the loopback
• Payload loopback—The signal returned to the loopback
To change the default loopback mode setting:
1. Select Loopback mode on the Port Test Configuration
2. Click Options on the Line Test Configuration dialog
166
command source consists of the full signal. Bit
sequence integrity is maintained. No change in framing
occurs, and no bipolar violations are removed. This is
the default loopback setting.
command source consists of the payload of the received
signal and newly-generated ESF framing.
dialog box (shown in
box.
The Port Options dialog box appears:
Figure D-2 on page
165).
Interphase Corporation
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