 Hence, the bandwidth requirement is 64kbit/s, with each bit corresponding to 8kbit/s.TFO is a mechanism that "steals" least significant bits (LSBs) of PCM samples to literally embed the bits from encoded stream.Since most GSM/UMTS codec rates are around the range of 8kbit/s to 16kbit/s (and higher rates of up to 32kbit/s for 16 kHz sampled Wide Band codecs), one needs to steal only about 1 or 2 LSBs of total 8 bits.