L3 D Channel Control L3/L5 Events

PPL Event Request (L5 to L3) | PPL Event Indication (L3 to L5)
--- | ---
0x0001 Manual D Channel Switchover * | 0x0001 D Channel Active * 0x0002 D Channel Standby * 0x0003 D Channel Not Aligned *
| 0x0004 -Network Side D Channel Down, T309 started
| 0x0005 - T309 expired. Network Side D Channel Down
| 0x0006 - Network Side D Channel Re-Established.
* Applies to D channel Backup only.

See Programmable Protocol Language.
A condition that, when met, drives a state machine from one state to another. A condition that drives a Component out of its current state by invoking an associated primitive.
Data channel. One of two fundamental components of an ISDN interface, it provides a path (16Kbps for BRI, 64Kbps for PRI) for carrying control signals and call data in a packet-switched mode.