NFAS Type

For Quad T1 lines, you can set the non-facility associated signaling (NFAS) parameters by clicking Boards==>Lines and double-clicking a device using a quad T1 line. NFAS Details

From the NFAS Type pull-down list, choose one of the following options:

Disabled

Choose this option to disable NFAS on the interface.

Primary

Choose this option to set the line as the primary D Channel for the specified group.

Secondary

Choose this option to set the line as the backup D Channel for the specified group.

Slave

Choose this option to set the line as a slave interface. If you choose this option, all channels on the line become B Channels.

Once NFAS is enabled on a Quad T1 board, all T1 lines can no longer run in the standard configuration of the 23 B channels and 1 D channel.

Note - Setting multiple pairs of primary and back up D channels in the same group causes NFAS to break.