- Digital Data Service (DDS) provide point-to-point synchronous communications at:
- 2.4 Kbps
- 4.8 Kbps
- 9.6 Kbps or
- 56 Kbps
- guarantees full-duplex bandwidth by setting up a permanent link from each endpoint
- 99% error free
- doesn't requires modem, requires bridge or router through a device called a CSU/DSU. This device translates standard digital signals a computer generates into bipolar digital signals used by synchronous communications
- Available in several forms:
| # of T channels | Speed | |
| DDS | ||
| T1 | 1 | 1.544 Mbps |
| T3 | 28 | 45 Mbps |
| T4 | 168 | 274.7 Mbps |
| Switched 56 | 56 Kbps |
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