T1 Hierarchy Summary Chart
| Sig. Lvl | Carrier | # of T1s | # Voice Ckts | Speed Mbps | |
| DS-0 | - | 1/24 | 1 | 0.64 | |
| DS-1 | T1 | 1 | 24 | 1.544 | |
| DS-1C | T1C | 2 | 24 | 3.152 | |
| DS-2 | T2 | 4 | 96 | 6.312 | |
| DS-3 | T3 | 28 | 672 | 44.736 | |
| DS-4 | T4 | 168 | 4032 | 274.760 |
Data Services
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