Operating instructions

Digital Telephone Hybrid
Set Codec Rx Atten - Performs fine adjustment of codec receive volume.
Host sends command - 82
Host sends byte in range 0-54, 126 or 127: 0 represents +6 dB, 18 represents 0 dB, 54 represents -12 dB.
All values in between 0 and 54 are valid, representing 1/3 dB increments. A value of 126 causes the receive
volume to decrease 1 dB. A value of 127 causes the receive volume to increase 1 dB.
Get Codec Rx Atten - Retrieves current fine adjustment of codec receive volume.
Host sends command - 83
Host receives byte in range 0-54: 0 represents +6 dB, 18 represents 0 dB, 54 represents -12 dB. All values
in between are valid, representing 1/3 dB increments.
Set Codec Privacy Mode - Selects privacy mode for codec interface.
Host sends command - 84
Host sends byte: 1: mute tx only, 2: mute rx only, 3: mute both
Get Codec Privacy Mode - Retrieves privacy mode for codec interface.
Host sends command - 85
Host receives data byte: 1: mute tx only, 2: mute rx only, 3: mute both
Monitoring Commands
The following commands are intended for convenient fast monitoring of TH3 status from control systems.
Get Quick Settings - Retrieves information about current TH3 status that may change at any time.
Host sends command - 100
Host receives 3 data bytes:
Byte 1: connect status, privacy status and privacy mode for both interfaces, expressed as a bitmap.
The low order nibble contains telephone information, and the upper nibble contains codec informa-
tion. Within each nibble, bit 0 (the LSB) is the connect status, bit 1 is the privacy status, and bits 2
and 3 contain the privacy mode.
Byte 2: telephone receive attenuation (see Get Phone Rx Atten, above)
Byte 3: codec receive attenuation (see Get Codec Rx Atten, above)
Get Full Settings - Retrieves information about current TH3 status that does not change asynchronously (except
signal routing information).
Host sends command - 101
Host receives 4 data bytes:
Byte 1: telephone echo suppression (see Get Phone Echo Suppression, above)
Byte 2: codec echo suppression (see Get Codec Echo Suppression, above)
Byte 3: upper nibble: dial speed (see Get Dial Speed), lower nibble: auto answer setting (see Get
Auto Answer).
Byte 4: bit 4-7 (upper nibble) rx agc setting (see Get Phone Rx AGC, above), bit 2 audible ring
chime status, bit 1 auto disconnect enable status, bit 0 (LSB) panel switch disable status
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