User's Manual

PH8/PH8-P Hardware Interface Overview
3.6 Analog Audio Interface
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3.6 Analog Audio Interface
PH8/PH8-P has an analog audio interface with a balanced analog microphone input and a bal-
anced analog earpiece output. A supply voltage and an analog ground connection are provided
at dedicated lines.
PH8/PH8-P offers eight audio modes which can be selected with the AT^SNFS command. The
electrical characteristics of the voiceband part vary with the audio mode. For example, sending
and receiving amplification, sidetone paths, noise suppression etc. depend on the selected
mode and can in parts be altered with AT commands (except for mode 1).
When shipped from factory, all audio parameters of PH8/PH8-P are set to audio mode 1. This
is the default configuration optimised for the Votronic HH-SI-30.3/V1.1/0 handset and used for
type approving the Cinterion Wireless Modules reference configuration. Audio mode 1 has fix
parameters which cannot be modified. To adjust the settings of the Votronic handset simply
change to another audio mode.
3.7 Digital Audio Interface
PH8/PH8-P supports a digital audio interface that can be employed either as pulse code mod-
ulation or as inter IC sound interface. Operation of these interface variants is mutually exclu-
sive.