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The 2-bit, channel-associated PCM signaling cards are used by VCO/4K systems equipped with E1 interface cards. Forward signals are used by originating or outgoing ports, while backward signals are generated by incoming ports.
Table 2-1 shows the PCM signaling codes.
| Signal | Exchange Signaling Forward Backward | |
|---|---|---|
| Af Bf | Ab Bb | |
Idle | 1 0 | 1 0 |
Seize | 0 0 | 1 0 |
Seize Acknowledge | 0 0 | 1 1 |
Answer | 0 0 | 0 1 |
Flash | 1 0 | 0 1 |
Called Party Clear | 0 0 | 1 1 |
Called Party Reanswer | 0 0 | 0 1 |
Calling Party Clear | 1 0 | 0 1 |
Calling Party Clear | 1 0 | 1 1 |
Release Guard | 1 0 | 1 0 |
Blocking | 1 0 | 1 1 |
Posted: Sun Sep 29 10:51:02 PDT 2002
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