You can use this drop-down to show and set the type of loopback applied to the currently selected channel or channels. The options are None, Payload, Line and Line (Anti Jitter).

You can use this drop-down to show and set the Admin State of the currently selected channel or channels.

• Changes made using System Status only apply to the channel whilst running System Status. They do not override the system configuration settings.

• To perform loopback testing, select Whole Line and set the Admin State to Out of Service. The changes applies to all channels.

• Selecting Whole Line and setting the Admin State back to In Service returns the status of each channel back to their current configuration settings.

You can use this drop-down to select the type of loopback testing used. The options are Pseudo-random 15 bit or Pseudo-random 20-bit.

The individual channel number.

The call reference of the current call on the channel.

The admin status of the individual channel. See above.

The loopback status of the individual channel. See above.