DS0
OC3/12
DS3
DS3
DS3
DS1
DS0
DS0
DS1
DS1
DS0
OC48
OC48
3/1 DACS
SONET
ADM
DS3
DS3
DS3
DS1
DS0
DS0
DS1
DS1
OC48
Class 5
Switch
Class 4
Switch
Class 4
Switch
Class 5
Switch
3/1 DACS
SONET
ADM
OC3/12
Customer
Premise
Customer
Premise
Local
CO
Interexchange
Local
CO
Rigid structure yields high cost per bit
Lower-margin services disfavor new investment
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