msm7718-01 Oki Semiconductor, msm7718-01 Datasheet - Page 9

• Manufacturer Part Number: msm7718-01
• Description: Echo Canceler With Adpcm Codec
• Manufacturer: Oki Semiconductor

¡ Semiconductor
Notes : The PCM signals of the ADPCM transcoder are assigned to time slot 2. (The PCM signals
Microphone
and speaker
of the master
telephone
of the PCM CODEC are always assigned to time slot 1.) The PCM signals of an external
PCM CODEC are assigned to time slot 3.
Various routing can be implemented providing extension of external PCM CODECs.
Route between the line and the slave telephone
Route between the master telephone's microphone/speaker (handsfree) and the slave
telephone
Route between the line and the master telephone's microphone/speaker (handsfree)
PCMLNI and PCMLNO are assigned to time slot 1 and PCMACI and PCMACO are
assigned to time slot 2.
Turn on the line echo canceler, and establish the route between the line and the slave
telephone.
PCMLNI and PCMLNO are assigned to time slot 3 and PCMACI and PCMACO are
assigned to time slot 2.
Turn on the line echo canceler, and establish the route between the microphone/
speaker of the master telephone and the slave telephone.
PCMLNI and PCMLNO are assigned to time slot 1 and PCMACI and PCMACO are
assigned to time slot 3.
Put the line echo canceler into “through mode”, and establish the route between
the line and the microphone/speaker of the master telephone.
Line
MSM7718
Figure 4 PCM Signal Connection Example 2
CODEC
CODEC
PCM
PCM
Line Echo
Canceler
ADPCM
CODEC
Slave telephone
MSM7718-01
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