T1 meaning

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A broadband, digital, data-transmission system for multiplexing signals over a telephone line, as for voice communication, at 1.54 million bps.
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Corresponds to DS-1 (Digital Signal level One) in the North American digital signal hierarchy.The fundamental level of the T-carrier digital carrier system.A T1 system comprises circuitterminating equipment in the form of a combination of a channel service unit (CSU) and data service unit (DSU) that jointly serve to interface a device to a full-duplex (FDX) four-wire digital circuit and to perform various signal-formatting, signal-timing, monitoring, and diagnostic functions.T1 operates at a signaling rate of 1.544 Mbps, which supports a frame rate of 8,000 frames per second (fps), with each frame comprising a framing bit followed by 192 bits of user payload, at least potentially.The framing bits are used for synchronization and, in some cases, for monitoring, diagnostic, and other network management purposes.The 192 bits of user payload are organized into 24 time-division multiplexed (TDM) time slots, each of which is eight bits wide. See Figure T-1. At a rate of 8,000 fps, each time slot is repeated 8,000 times per second, which translates into a DS-O channel at 64 kbps (8 bits.
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Refers to the settlement date after the purchase of a security; T+1 is the trade date plus one day. The securities industry has a goal to reach T+1 by 2004. T+0, T+2, and T+3 are other common references.
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