GE863-PRO3 Hardware User Guide
1vv0300773a Rev. 0 - 24/01/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 44 of 64
The Base Band Chip of the GE863-PRO3 GSM/GPRS engine provides two different audio blocks; both
in transmit (Uplink) and in receive (Downlink) direction:
“MT lines” should be used for handset function,
“HF lines” is suited for hands -free function (car kit).
These two blocks can be active only one at a time, selectable by AT command. The audio
characteristics are equivalent in transmit blocks, but are different in the receive ones and this should
be kept in mind when designing.