The Telephone System

Central Office Switch

RLU

RLU

“Internet Bypass”

Gateway

Building

Campus

City

National

Access Service

Node

Metropolitan-Network

Audio/Video Distribution

(lossy)

Data Distribution

(lossless)

Home

Business

PC-nodes with OC3 and OC12 ¼ber links

supply DRAM, Disk, and PC service

Length Scale

Remote

Line

Unit

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