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The following information is presented for reference only. It describes the relative capacity of the various data lines that are used for Internet backbone connectivity. If this chart makes no sense to you, don't worry. We won't test you on it.
North American Digital Carrier Hierarchy
| Digital Signal Designation | Data Rate | DS-1 Signal Capacity | Voice Channel Capacity |
| DS-0 | 64 Kb/s | 1 | |
| DS-1 (aka T-1) | 1.544 Mb/s | 1 | 24 |
| DS-1C | 3.152 Mb/s | 2 | 48 |
| DS-2 | 6.312 Mb/s | 4 | 96 |
| DS-3 | 44.736 Mb/s | 28 | 672 |
| DS-4 | 274.176 Mb/s | 168 | 4,032 |
SONET Optical Carrier Hierarchy
| Optical Carrier Designation | Line Rate | Number of STS1 Signals | DS-1 Signal Capacity | Voice Channel Capacity |
| OC-1 | 51.84 Mb/s | 1 | 28 | 672 |
| OC-3 | 155.52 Mb/s | 3 | 84 | 2,016 |
| OC-12 | 622.08 Mb/s | 12 | 336 | 8,064 |
| OC-24 | 1,244.16 Mb/s | 24 | 672 | 16,128 |
| OC-48 | 2,488.32 Mb/s | 48 | 1,344 | 32,256 |
| OC-192 | 9,953.28 Mb/s | 192 | 5,376 | 129,024 |