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= Glossary of phone design related terms =

ABB
Analog Base Band DBB
Digital Base Band TPU
Time Processing Unit. A programmable state machine to control events synchronous to the GSM bitclock TSP
Time Serial Port. Synchronization bus used for timing certain digital control signals. DSP
Digital Signal Processor MCU
Micro Controller Unit (the ARM CPU in the Calypso) BSP
Baseband Serial Port. Communicates digital I/Q samples between ABB and DBB USP
uController Serial Port. A SPI control interface between the MCU in the DBB and the ABB VSP
Voiceband Serial Port. Communicates speech samples between the DBB and the ABB UL
UpLink. The direction from the MS to the BTS. (Phone Tx) DL
DownLink. The direction from the BTS to the MS. (Phone Rx)