User Manual

GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 5 - 20/09/07
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 36 of 68
8 Audio Section Overview
The Base Band Chip of the GM862-QUAD / PY Telit Module 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 AXE hardware line or 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.