Features:
- 24-port per span card
- Provides an interface for 2 digital spans, combined with Digital Trunk Interface Expansion model 4029
- Digital span configured for T-1 interface (can be upgraded to Primary Rate Interface (PRI) when combined with model 4030)
- Comes with 6000-0110 paddle board and cables
- 4028 card includes model 4029 DTIC II expansion and model 3028 internal CSUs
System Requirements/Compatibility: