Phone Systems 
 
 Carrier data services

Dedicated digital circuits.

DS-0 : 64 kbps, usable 56
  DS-1 : (T1) 1.544 Mbps (24 x DS-0)
DS-2 : 6.312 Mbps (3 x DS-1)
DS-3 : 44.736 Mbps (7 x DS-2)
DS-4 : 274.176 Mbps (6 x DS-3)
 


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  © The Telepone System Virtual Lecture by L.Scott Freudenthal