Technical Manual

3. ELECTRICAL DESCRIPTION
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LZT 123 7607 R1B
GT47-GR47 Signal Cross-reference Table B
3.3 Audio Connector
A 4-way RJ9 connector, as shown below, allows a telephone handset to be
plugged into the GT47, giving access to the microphone and earpiece
signals. The connector may also be used to drive other analogue audio sub-
systems or devices.
The module is configured to work with a range of handsets. If necessary,
changes can be made to the characteristics of the audio interface by sending
the GT47 appropriate AT commands.
GT47 / GT48 Relationship to
GR47/GR48 engine
GT47
Pin
GT Alternative
signal
Dir. Pin Corresponding
GR47 Signal
HD15 Connector
1 OUT-6 O 38 O1
2 I 42
3 O 41
4 TD-2 I 43 TD3
5 RD-2 O 44 RD3
6 OUT-7 O 32 O3
7 IN-4 I 39 IO9
8 OUT-8 O 40 O4
9 OUT-5 O 20 DAC
10 OUT-9 O 36 O2
11 RTS-2 I 24 IO4
12 CTS-2 O 23 IO3
13 IN-5 I 37 IN1
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