patcat88
join:2002-04-05
Jamaica, NY
kudos:1 | reply to ajc18
Re: Upload Its not that a channel is allocated to upstream or downstream, its wiring limits. For HFC/coax, the amplifiers have only a handful of upstream channels that have to contain DAVIC, DOCSIS, legacy analog, etc to control the boxes, PPV, MOD, VOD, IPG data, etc.
»en.wikipedia.org/wiki/North_Amer···quencies
For DSL, the problem is crosstalk at the CO. When the upstream data reaches the CO, its already weak, but all the RFI/harmonics from all the other pairs in the ducts and building weaken the upload even more by the time it enters the line card. For DSL download channels, its very quiet at your house, you have many times less RFI than at the CO, so your modem gets a much stronger signal and can go faster. |
