
4
Verizon Proprietary – not for use
without Verizon’s permission
Transport Network of the 1980’s
Access
Service
END USER
Location
Verizon Central Offices Inter -Office
Carrier POP
Location
Access
Service
END USER
Location
Verizon Central Offices Inter -Office
POTS
Lines
Entrance
Facility
PSTN
DS1
Private Line
DDS /VG
Private Line
DS0 to DS1
Multiplexing
DS1 to DS3
Multiplexing
DS3
Handoff
• POTS lines connected to End Office switches
• End office Switches and Carriers connected to Tandem Switches
• DDS and VG private line circuits terminated in DS0 to DS1 multiplexers
• All of these services, combined with DS1 private Line, got aggregated onto
DS3s for delivery to a Carrier’s POP Location
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