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9/24/01 10-3
Figure 10-1: FXO Operation
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Figure 10-2: DPT Operation
10.3.2 Dial Pulse Termination (DPT)
In DPT mode, the FXO/DPT offers near end termination for one-way Direct Inward Dial (DID). Two-
way DID is provided by CAC’s 4 wire E&M interface. The DPT card interprets T1 signaling bits to:
• provide incoming seizure
• act as a current sink for a PBX -48V battery source
• establish an audio path
Telephone Telephone
Fax
Fax
FXO
FXS
PBX
CO
Incoming
Outgoing
T1
Calling Party Called Party's
Direct Extension
PBX
CO
Direct Inward Dialing (DID)
T1
*Battery Reversal FXS/DPO 12-
Channel Analog Card