Types of ISDN Services
Basic rate interface (BRI)
- Basic access service or 2B+D
- Two 64 Kbps bearer ‘B’ channels (for voice or data)
- One 16 Kbps control signaling ‘D’ channel
- Can be installed over existing telephones lines (if less than 3.5 miles)
- Requires BRI specific end connections
Primary rate interface (PRI)
- Primary access service or 23B+D
- Twenty three 64 Kbps ‘B’ channels
- One 64 Kbps ‘D’ channel (basically T-1 service)
- Requires T1 like special circuit