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Networking Fundamentals · Foundational

T1 Line

A North American digital circuit carrying 1.544 Mbps as 24 time-division channels of 64 Kbps.

Definition

T1 lines were used for voice trunks and WAN links and terminate at a smart jack with RJ48C connectors. A T3 carries 28 T1s at 44.736 Mbps. They are being retired in favor of Ethernet services.

Example

A legacy branch uses a T1 for its WAN connection.

Exam tip

T1 = 1.544 Mbps, 24 channels; E1 = 2.048 Mbps, 32 channels.

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