Polycom Vortex EF2211 Programming Manual page 42

translate to AEC states.
Byte Value AEC State Value (Byte Value - 132)
132 0
133 1
134 2
135 3
Here's an example BLDATA message to clear things up.
S01BLDATApèppçppppppèä
The first four bytes (pèpp) consist of only two values.
p = 0x70 = 112 112 - 132 = -20
è = 0x8A = 138 138 - 132 = 6
So, the signal at input A is at 6 dB, while the signals at the rest of the inputs are at -20 dB.
The next five bytes (çpppp) consist of only two values.
p = 0x70 = 112 112 - 132 = -20
ç = 0x87 = 135 135 - 132 = 3
So, the signal at output 1 is at 3 dB, while the signals at the rest of the outputs are at -20 dB.
The next byte (p) consists of only one value.
p = 0x70 = 112 112 - 132 = -20
So, the signal level of the AEC reference is -20 dB.
The next byte (p) consists of only one value.
p = 0x70 = 112 112 - 132 = -20
So, we know that the room gain for input 1 is -20 dB.
The next byte (è) consists of only one value.
è = 0x8A = 138 138 - 132 = 6
So, we know that the AGC gain for input1 1 is 6 dB.
AEC State Description
Idle
Transmit
Receive
Double Talk