FXS Signaling Option Descriptions
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Figure 8-3: FXS Signaling Options
8.6 FXS Signaling Option Descriptions

8.6.1 Option Switches A, B, and C

Signaling options selected by the A, B, and C option switches are discussed below according to the
numbered sequence from 0 to 7 in Table 8-2.

8.6.1.1 Option 0. Normal FXS A&B Signaling, Loop-Start or Ground-Start

With this selection, the Access Bank II - SNMP FXS interfaces automatically adapt to loop-start or
ground-start signaling received from the T1 line on a channel-by-channel basis. When using this
option, order FXS loop-start or FXS ground-start signaling from your service provider.

8.6.1.2 Option 1. E&M Wink-Start-to-Loop-Start Conversion with Calling Party

Disconnect

The FXS-ID voice card provides Plain Old Telephone (POTS) loop-start interfaces to a PBX or regu-
lar telephones. E&M wink-start signaling and per-channel ringback tones are sent to the T1 line.
Calling Party Disconnect
Calling Party Disconnect (CDD) is a 2-second, tip-open condition at the FXS-ID when the network
releases seizure (the far-end called party hangs up). The battery feed from the FXS- ID re tur ns to idl e
(tip grounded) after the two-second disconnect. This feature is similar to local telephone servi ce Call -
ing Party Disconnect (CPD), which some Central Office equipment provide s for answer ing mac hines
and PBXs equipped to detect loss of loop current on their line interfaces. This loss of loop current
Switch A Switch B Switch C
OFF OFF OFF
Switch A Switch B Switch C
ON OFF OFF
Signaling Options
& Busy/Idle Signaling Options
& Busy/Idle