... present when a dedicated link is active between the Mobile Station and the BTS. On the downlink, the SACCH is used to monitor mobile Tx power commands, timing advances, and the Cell's channel configuration. On the uplink, the SACCH receives signal quality report (RxQual), signal level report (RxLev), the adjacent BCH power measurements, and the Mobile Station's status. The power is ... at a bit rate of 270.833kbits/s. GSM offers many subscriber services such as support of dual-tone multi-frequency (DTMF), support of CCIT Group 3 facsimile, support of short messaging services, cell broa...

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