Thread: qam differences
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Old 12-06-2007, 19:33   #11
Incomplete
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Re: qam differences

Quote:
Originally Posted by Mick Fisher View Post
As far as I know, Tjets were only on the then Ntl network.

They were a sturdy and reliable modem but since Ntl removed some service (smpt? or similar?) they weren't able to be interrogated. They also could not go above (IIRC) about 8.3Mbps and as already mentioned were completely screwed up by the introduction of QAM256.
SNMP - Simple Network Management Protocol.

Limitation on them was that the ethernet port on them was only capable of 10Mbps operation.

I remember having one, good modem

---------- Post added at 20:33 ---------- Previous post was at 20:32 ----------

Quote:
Originally Posted by Dark Fiber View Post
Is it QAM256 per se or the change in power level that accompanies the introduction of QAM256 ?
Power levels at launch were dropped by about 6dB to compensate for the increased loading of the 256QAM constellation. The TJs should have been able to cope with 256QAM but for some reason couldn't get MCNS lock.
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