What Does Great OEM Developer Support Look Like?

What does great OEM developer support look like? Here’s but a small sample. It’s a response by our support guy to a question from a T.38 relay licensee.

Commetrex Support: The reason there are no image data in the outgoing PCM is that the recordings are not accurately clocked. The sampling frequency is too fast. For example, in the ANSam, the phase reversals should be exactly 3600 samples apart, but they aren’t. The V.21 receiver can track the signal because the symbols are so big (26.666 samples/symbol). However, the high-speed image modems can only track about one-symbol-per-second drift. That’s about +/-3 samples per second for 9600.

So V.21 gets decoded but the high-speed signals are not.

Leave a Comment