- This card provides either a T1 interface supporting 24 DS0 channels or an ISDN PRI interface supporting 23 B (bearer) channels, one D (datalink) channel, and 12 digital stations.
- To enable ISDN PRI functions, a jumper on this card must be plugged onto pins 7 and 8 of J3.
- It supports various trunk types (loop-start, ground-start, E&M, and DNIS/DID) with immediate, wink-start, or dial-tone-start signaling.
- Equipped with a built-in CSU, it can connect directly to a network interface unit, SmartJack, or ISDN PRI.
- Up to 12 Digital Feature Phones can be connected to this card.