Superhub : SuperHub becomes standard kit

[Andrewcrawford23]

Originally Posted by BenMcr

You can do 200Mbit with the VMNG300 - if you limit it the product to 4 downstreams

However Virgin have already started to use more than 4 downstreams for 100Mbit, so that requires the VMDG480 to work correctly.

acutally i think ( im not 100% sure not even sure masque might be able to give a defintive answer to this probally need someone to upgrade to 200mb on vmng300) but i am pretty sure it auto negeotiated the downstream channel rate and i think each channel has a maximum of 60mb through it (to long since i looked at the specs so please dnt grill me anyone) so in thoery can do 200mb but above 200mb i think you will need mroe downstream channels

but since superhub in modem mode is basically jsuta bridge it adds latency there no covering or hiding this, it in the simplies form think of cable length, the logn the cable length of say cat5e the speed degrades as with jitter and ping the shorter the better, it basically adding length to the cable run. if it had a amplifier so boosting so to say the shorten the cable length so in thoery makign the cable length be logner similar to how you do some networking, then it would probally act the same as vmng300 in modem mode but sadly it doesnt it jsut plain router switched to bridge mode :S

[craigj2k12]

50mb per channel, so the VMNG would be able to do 200mbit if it was uncontended

that second paragraph is wrong as well, sorry

[Peter_]

Originally Posted by Andrewcrawford23

acutally i think ( im not 100% sure not even sure masque might be able to give a defintive answer to this probally need someone to upgrade to 200mb on vmng300)

Which will never happen, you might as well try and put a 3COM Tailfin on 20Mb for all the good it will do.

[Andrewcrawford23]

Originally Posted by Masque

Which will never happen, you might as well try and put a 3COM Tailfin on 20Mb for all the good it will do.

never goign to happen but i tohught it ocudl handle it

---------- Post added at 14:44 ---------- Previous post was at 14:43 ----------

Originally Posted by craigj2k12

50mb per channel, so the VMNG would be able to do 200mbit if it was uncontended

that second paragraph is wrong as well, sorry

it is right but my way of explaining myself isnt always te best

[Peter_]

Originally Posted by Andrewcrawford23

never goign to happen but i tohught it ocudl handle it

They really struggled on 10Mb, brought out for 512kb.

[Andrewcrawford23]

Originally Posted by Masque

They really struggled on 10Mb, brought out for 512kb.

oh the good old days of first true broadband :O prior to moving to telewest at te time for cable broadband not long after it came about i was on dual isdn line

[Ignitionnet]

Originally Posted by Andrewcrawford23

acutally i think ( im not 100% sure not even sure masque might be able to give a defintive answer to this probally need someone to upgrade to 200mb on vmng300) but i am pretty sure it auto negeotiated the downstream channel rate

If I remember right you work for VM in tech support.

I rather hope it's not in broadband. Cable does not negotiate downstream channel rate.

---------- Post added at 17:58 ---------- Previous post was at 17:55 ----------

Originally Posted by Andrewcrawford23

it in the simplies form think of cable length, the logn the cable length of say cat5e the speed degrades as with jitter and ping the shorter the better, it basically adding length to the cable run. if it had a amplifier so boosting so to say the shorten the cable length so in thoery makign the cable length be logner similar to how you do some networking, then it would probally act the same as vmng300 in modem mode but sadly it doesnt it jsut plain router switched to bridge mode :S

Are you saying that the an extra few metres matters at 2/3rds the speed of light, and that it'll add jitter given that Ethernet operates on fixed timings and uses CSMA?

[General Maximus]

Originally Posted by Ignitionnet

If I remember right you work for VM in tech support.

if that is the case I am even more concerned then why he is asking Masque for his opinion. I suppose it is as good as the tech guys I spoke to telling me that each channels only runs at 20mbit, 4 channels is 80mbit, which is why I needed to the shub for 100mbit

Originally Posted by Andrewcrawford23

the logn the cable length of say cat5e the speed degrades as with jitter and ping the shorter the better

the difference in cable length is negligable until you start getting close to that 100m limit and as Igni has mentioned, that is due to ethernet using CSMA/CD and getting a response back in time before a frame is put on the wire.

[Peter_]

Originally Posted by General Maximus

if that is the case I am even more concerned then why he is asking Masque for his opinion. I suppose it is as good as the tech guys I spoke to telling me that each channels only runs at 20mbit, 4 channels is 80mbit, which is why I needed to the shub for 100mbit

Ignitionnet knows his stuff.

[Andrewcrawford23]

Originally Posted by Ignitionnet

If I remember right you work for VM in tech support.

I rather hope it's not in broadband. Cable does not negotiate downstream channel rate.

---------- Post added at 17:58 ---------- Previous post was at 17:55 ----------



Are you saying that the an extra few metres matters at 2/3rds the speed of light, and that it'll add jitter given that Ethernet operates on fixed timings and uses CSMA?

as normal i use poor examples to express myself since i am crap at expressing what i mean, i wasnt meaning anytihng about the cat5e cable more a coparsion, ie that the longer the cable get the more breaks ie switches patch panels etc the more so to say interferences taht means the singal gets poor

i meant that the superhub kinda acts the same as the router adds a break so itnerference so even in modem mode is not goign ot be the nea rthe same as a modem which has one less interference does that majke sense?

edit: i think i mis put myself across on wha ti mean about the channel, i meant teh docsis 3 maximum per channel

ive always had a problem expressing wha ti mean, thoery i udnerstand and i generally can explain wha ti mean in person wher ei can also use examples psychical ones and people can see i udnerstand it but written im like a foriegn trying to write english no offense to foriegn jsut my written english is extremely poor inclding express english

[General Maximus]

Originally Posted by Andrewcrawford23

does that majke sense?

ya, you mean the the shub creates another unneccessary hop the data has got to go through which increases the opportunities for problems to occur

[Andrewcrawford23]

Originally Posted by General Maximus

ya, you mean the the shub creates another unneccessary hop the data has got to go through which increases the opportunities for problems to occur

yeah that makes it sound simpler to whatt im trying to explain with weird examples not connected to what i am saying just a example of what i am trying tio explain

[craigj2k12]

if you have a 3 metre ethernet cable or a 50 metre cable it wont make a difference, anything above 100m is when signal starts to degrade

[Andrewcrawford23]

Originally Posted by craigj2k12

if you have a 3 metre ethernet cable or a 50 metre cable it wont make a difference, anything above 100m is when signal starts to degrade

go do some bench testing you will see there is a difference, add patch panel and switches into it and you can see a difference on 100mb network of about 4-6mb ie as much lost to be 94mb 1gbit can lose up to 12-14mb from it total

but that isnt for thsi thread it ould be off topic i was trying to use it as aexample of wha ti was meaning

[craigj2k12]

im using a 25 metre ethernet cable at the moment and theres no different using a 1 metre ethernet cable