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buzz_4_20

join:2003-09-20
Limestone, ME
reply to UnnDunn

Re: It's coming

Upload is limited by the tech, but not as much as the end user gets.

The tech (DOCSIS 3.0) limits upload to a bit over 50% of the download speed (per channel).

TW is no where close to that ratio on upload.


iansltx

join:2007-02-19
Austin, TX
kudos:2
Reviews:
·Time Warner Cable
·Verizon Online DSL
·Comcast

In my area TWC has one upload channel funning at 3.2 MHz width, which can transmit at most 15 Mbps (or 10 Mbps based on line noise). They have four downstreams, with a combined download capacity of 152 Mbps before IP overhead. This matches up with the 50/5 plan that I have.



skuv

@rr.com
reply to buzz_4_20

said by buzz_4_20:

Upload is limited by the tech, but not as much as the end user gets.

The tech (DOCSIS 3.0) limits upload to a bit over 50% of the download speed (per channel).

TW is no where close to that ratio on upload.

A QAM channel, which is what a downstream channel is, is about 38mbit.

Upstream channels are ~10mbit.

DOCSIS 3.0 bonds 8 downstreams and 8 upstreams. That is about ~310mbit down max and ~80mbit up max. A little more than 25%, not close to 50%.

No, the end user doesn't get 25% either, but they won't be getting 50% unless their downstream is limited while their upstream is raised.


TelecomEng

@rr.com

said by skuv :

A QAM channel, which is what a downstream channel is, is about 38mbit.

Upstream channels are ~10mbit.

DOCSIS upstreams are 10Mbps only if you use the DOCSIS 1.x upstream modulation profiles. DOCSIS 2 upstream profiles enable ~30Mbps on a 6.4Mhz wide, 64QAM upstream.

»www.cisco.com/en/US/tech/tk86/tk···27.shtml