What is the maximum upload speed for BlueYonder cable?

|Kippa| · 29-04-2005, 14:07

I am just wondering what the maximum upload rate is for BlueYonder connections COULD be. Could the upload rate go higher than 800ksec?

Graham M · 29-04-2005, 14:31

I doubt it very much.

nn012 · 29-04-2005, 15:25

i think the the highest upload on BY at the moment is 512k, but thats only available to business customers

**Mick** · 29-04-2005, 16:15

Telewest's 4MB Speed tier offers an upload rate of 384K.

|Kippa| · 29-04-2005, 18:30

I've got the BY 4mb connection with 386k upload rate, just hoping that the next upgrade will be at least 512k upload rate, or 512k or higher in future.

Ignition · 29-04-2005, 18:45

Quote:

Originally Posted by |Kippa|

I am just wondering what the maximum upload rate is for BlueYonder connections COULD be. Could the upload rate go higher than 800ksec?

Could be?

In theory 8.8Mbps or so.

humey · 29-04-2005, 18:57

Under dosci 1, we all share 1meg up pipes (between X amount of users) so you could have 1 meg max, i know peeps abroad on 15meg/1meg

To get by the 1meg limit outside dedi servers, you need wait on dosci 2.

m4x · 29-04-2005, 20:58

upload is only 128kbps .... lol sh*t i knw

Ignition · 29-04-2005, 20:59

Quote:

Originally Posted by humey

Under dosci 1, we all share 1meg up pipes (between X amount of users) so you could have 1 meg max, i know peeps abroad on 15meg/1meg

To get by the 1meg limit outside dedi servers, you need wait on dosci 2.

Erm, no you don't, 4.4 or 8.8Mbit.

It's DOCSIS by the way, Data Over Cable Service Interface Specification

Fastest cable I've ever seen is 10/1. Available from amongst others Optimum Online / Cablevision and Cogeco.

I'm not even going to go into how poor the service would be having multiple 1Mbit upstream users sharing a 1Mbit upstream...

Graham M · 30-04-2005, 01:20

Quote:

Originally Posted by m4x

upload is only 128kbps .... lol sh*t i knw

Helpful first post, considering it doesnt answer the question...

ah well

anyways

Ignition · 30-04-2005, 06:58

To save this thread dragging on any more:

Upstream capacities on modern network, including those that are pretty much unachievable - the higher up the bits/symbol count goes the harder it is for the networks to reliably run, and to run past 16QAM on the upstream is pretty special.

DOCSIS 1.0:

3.2MHz wide QPSK, symbol rate 2.56Msym/s @ 2 b/sym = 4.4Mbps payload

3.2MHz wide 16QAM, symbol rate 2.56Msym/s @ 4 b/sym = 8.8Mbps payload (not always implemented).

DOCSIS 1.1:

As above except 16QAM support is required.

DOCSIS 2.0:

As above +

3.2MHz wide 8QAM, symbol rate 2.56Msym/s @ 3b/sym = 6.6Mbps payload
3.2MHz wide 32QAM, symbol rate 2.56Msym/s @ 5b/sym = 11Mbps payload
3.2MHz wide 64QAM, symbol rate 2.56Msym/s @ 6b/sym = 13.2Mbps payload
3.2MHz wide SCDMA 128QAM, symbol rate 2.56Msym/s @ 7b/sym = 15.4Mbps payload
6.4Mhz wide QPSK, symbol rate 5.12Msym/s @ 2b/sym = 8.8Mbps payload
6.4MHz wide 8QAM, symbol rate 5.12Msym/s @ 3b/sym = 13.2Mbps payload
6.4MHz wide 16QAM, symbol rate 5.12Msym/s @ 4b/sym = 17.6Mbps payload
6.4MHz wide 32QAM, symbol rate 5.12Msym/s @ 5b/sym = 22Mbps payload
6.4MHz wide 64QAM, symbol rate 5.12Msym/s @ 6b/sym = 26.4Mbps payload
6.4MHz wide SCDMA 128QAM, symbol rate 5.12Msym/s @ 7b/sym = 30.8Mbps payload.

OK There's the DOCSIS specs, should be the thread sorted now, Telewest currently run DOCSIS 1.1.

Ah to save a 'how much download speed can be offered' thread

all DOCSIS specs are the same on this one so these apply to TW network:

6MHz wide 64QAM downstream, symbol rate 5.057Msym/s @ 6b/sym = 27Mbps payload
6MHz wide 256QAM downstream, symbol rate 5.36Msym/s @ 8b/sym = 38Mbps payload.

Please note that I'm giving the throughputs you can realistically expect to see from all of these, not the raw line rate, if you want that get a calculator and multiple symbol rate by bits/symbol, is also why the numbers aren't exact, impossible to predict exact yield at any one time.

Question answered?

jtwn · 30-04-2005, 10:43

..is there a limit to this man's knowledge?

Graham M · 30-04-2005, 10:47

What a great post! Reps delivered appropriately

humey · 30-04-2005, 11:06

What i said was true outside the typos, i did state we all share pipes to upload between X amount of users, so 1meg is max, your info is same but has more tech and confusing figures.

I asked a user in USA (op in my irc channel who is on 15meg/1meg), who is in the know how, he didnt rant with loads of tech, just in layman terms you share upload pipes so it not matter if pipe is 4.4megs like above, you are sharing it with so many users you could be given 1meg max, but most get 128-256k on cable.

Nice BY gave us 4meg users 384k but id love 512k.

You wont see uplaods go by 1meg till docsis 2.

Ignition · 30-04-2005, 11:34

Quote:

Originally Posted by humey

I asked a user in USA (op in my irc channel who is on 15meg/1meg),

Actually he's on Verizon FIOS, fibre to the home, 15/2.

It's perfectly possible to go over 1Mbit, just at the moment no-one has. No desperate commercial need.

You stated we shared 1Mbit pipes, bit different from saying that 1Mbit is the max due to contention considerations.