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'Random Access Channel' ('RACH') is used in mobile phones or other wireless device on a TDMA-based network when it needs to get the attention of a base station in order to initially synchronize its transmission with the base station.
Random Access Channel is a shared channel that is used by Wireless Access terminals to Access the Access Network(TDMA/FDMA,and CDMA based network) especially for initial Access and Bursty data transmission.

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Other uses

Other uses

'Rach' is colloquial shorthand for naming pieces by composer Sergei Rachmaninoff, as in "the Rach 2," "the Rach 3," etc.