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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)