long-distance transmission

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first transcontinental telephone line

Block diagram of a digital telecommunications system.

Two types of telephone switching networks(Left) The tandem, or local, network serves local offices and users; (right) the toll, or long-distance, network switches calls over long-distance circuits.

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long-distance transmission: Media

communications

Images

first transcontinental telephone line

first transcontinental telephone line

Map of the first transcontinental telephone line with details of the first transcontinental...

Encyclopædia Britannica, Inc./Kenny Chmielewski

Block diagram of a digital telecommunications system.

Block diagram of a digital telecommunications system.

Encyclopædia Britannica, Inc.

Two types of telephone switching networks(Left) The tandem, or local, network serves local offices and users; (right) the toll, or long-distance, network switches calls over long-distance circuits.

Two types of telephone switching networks(Left)...

Encyclopædia Britannica, Inc.