• T/DS lines:
  DS0: 64 kbps
  T1/DS1: 24 DS0's, 1.544 Mbps
  E1: 30 64kbps channels, 2.048 Mbps (Euro)
T3/DS3: 672 DS0's, 44.736 Mbps
T4/DS4: 4032 DS0's, 274.176 Mbps
• T/DS devices are asynchronous, with independent clocks in the devices
• Trunk3/Trunk4 must be run over fiber or microwave
• OC (Optical Carrier)/SONET lines:
  OC-1: 51.48 Mbps
  OC-3: 155.52 Mbps
  OC-12: 622.08 Mbps
  OC-48: 2.4 Gbps
  OC-192: 9.6 Gbps
• SONET devices are synch'd to an atomic clock: better throughput

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