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The T1 bandwidth available for circuits or services is a maximum of 1.536Mb, since for framing and line coding reasons (explained later), 8kb of the 1.544Mb is required to sustain the circuit itself. A T1 is a Telecom term for a 1.544Mhz facility that can carry a variety of services from a carrier to a customer's location. To optimize bandwidth, T1 is carried by 4 copper wires (or via fiber and converted back to copper at the customer site) and can support a wide range of services to include voice, data, and video. Through multiplexing (explained on our multiplexing page), T1 bandwidth can carry a combination of all of these services into a single circuit, reducing monthly access costs as opposed to buying individual DS0 (analog or digital) circuits. T1 Bandwidth Utilization. T1s are considered high capacity circuits, typically used by Telephone companies and medium to large business users that require more than a handful of individual lines, trunks, or DS0-level data circuits. Economies of scale come into play by combining circuits together into a single access facility. (The cost break-even point is typically 7-11 DS0s cost the same as a T1). In terms of bandwidth capacity, a T1 is equal to 24 DS0s of capacity. (24 DS0s x 64kb plus 8kb overhead). Once the band width T1 is leased, adding DS0 capacity requires very little lead-time, and no additional monthly cost for the access facility. Access is the most common use for T1s, however, for larger businesses, point-to-point T1 services may link two locations in a private network arrangement, either across town, or across the country. T1 bandwidth can be used for voice or data, as it is a digital transport service that is limited only in terms of its overall bandwidth capacity. Common Names / Muxing Levels:
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Bandwidth T1
