User guide

UC864-E/G/WD/WDU Hardware User Guide
1vv0300766a Rev.4
- 03/02/09
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 50 of 78
10. Audio Section Overview
The Base Band Chip of the UC864-E/G/WD/WDU 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).
Only one block can be active at a time, selectable by AXE hardware line or by AT
command. The audio characteristics are equivalent in transmit blocks, but are
different in receiving. This should be kept in mind when designing.