XM1240S AT Commands Reference Manual
No. XM1240S-A00-106
xmodus swiss GmbH
44 / 46
9. AUDIO
MODES
The AL5068SI ISDN Modem supports 2 independent analog channels by adding 2
external PCM Codecs. The Codecs are connected to the IOM-2 bus on pins 44…47
of the socket modem. It is possible to setup 2 simultaneous links for both incoming
and outgoing calls. The serial port remains in command state in this mode. The 2
external Codecs are marked with Codec A and Codec B. Each Codec (A or B) can
have his own MSN. Each call can therefore be directed to a specific Codec.
There are 2 additional I/O signals to drive the B-Channel source of each Codec.
Please refer to the “Designers Guide” for a detailed description and schematics about
the connection of the analog PCM codecs.
The set-up of the calls must be sequential. After starting the first call, this call must be
finished before starting a second call.
9.1 AT Command Specifications:
9.1.1 ATBn Command (selects B-Channel mode)
ATB40 :
B channel transparently switched to IOM-2 (speech connection)
ATB41 :
B channel transparently switched to IOM-2 (data connection)
ATB42 :
B channel transparently switched to IOM-2 (3.1kHz Audio)
ATB50 :
B channel transparently switched to IOM-2 2-channel mode (speech)
ATB51 :
B channel transparently switched to IOM-2 2-channel mode (data)
ATB52 :
B channel transparently switched to IOM-2 2-channel mode (3.1kHz
A.)
9.1.2 Initiate outgoing calls:
ATD command is enhanced with channel number A or B (corresponding Codec A / B)
ATDAxxxxxxxxxx
dials the number and makes connection for Codec A.
ATDBxxxxxxxxxx
dials the number and makes connection for Codec B.
ATBn and ATDxx commands can be merged together:
ATB52DA123456789<cr>
9.1.3 Answering incoming calls (manually)
ATA1A
Answer call no 1 and direct to Codec A
ATA1B
Answer call no 1 and direct to Codec B
ATA2A
Answer call no 2 and direct to Codec A
ATA2B
Answer call no 2 and direct to Codec B
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