3.1 kHz bearer service

Definition of 3.1 kHz bearer service in The Network Encyclopedia.

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What is 3.1 kHz bearer service?

A service provided by some telephone companies (telcos) for transmitting data over voice trunk lines.

This service is sometimes called data-over-voice (DOV). When supporting 3.1 kHz bearer service communications, telco switches must have their trunk-line echo cancellators turned off because echo cancellation will corrupt data transmission when sent over voice lines.

This service is a legacy telecommunications technology that is no longer widely implemented.