[Hidden-tech] Network question

[Matthew S. Crocker]

Ethernet has a very low overhead. Ethernet is 97% efficient at 1500 byte MTU . There is a reason why Ethernet is the protocol of choice for carriers these days. Cheap and FAST. 

TCP over Ethernet is 93% efficient which is what you get when you download files. 

Hubs are bad, throw them out and get switches. 

----- Original Message -----

> From: "Matt Lampiasi" <mattl at florenceit.net>
> To: hidden-discuss at lists.hidden-tech.net
> Sent: Wednesday, November 30, 2011 1:44:08 PM
> Subject: Re: [Hidden-tech] Network question

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> Hi

> Lot's of possibilities: Roberts comments make sense as a possibility.
> Also keep in mind that ethernet has quite a bit of protocol overhead
> so that if you had 10mbps cabling and/or cards you might see 30%
> drop.

> You don't say what kind of equipment this is all running through. If
> you have a 10mbps hub or 10mbps network cards in the pc's obviously
> that would be a problem.

> You're saying the front part of the building gets ok speeds?

> so if the networks hub or switch this connection routes through in
> the back is slow old or inefficient it can definitely slow things
> down. you say it goes into a patch panel. it must go into a switch
> or hub in the back. what kind?

> cable ratings can make a big difference over a longer drop like that.
> the longer the wire and the thinner the strands the more the signal
> loss (drop in speed).

> I'm totally not up on that but any cabling guy will be able to tell
> you what to use. If your pc's have gigabit or at least 100mbps
> network cards then the bottleneck is the cable run from the front ,
> or the switch/hub it goes into in back. (assuming the run goes into
> the same switch out front that all the other pc's use. ?)

> cat6 will give you less signal loss, but you have to make sure ALL of
> your distribution equipment (patch panels, ends crimped on the
> cables, etc .) must be rated for the same as your higher end cable,
> and i would make sure its shielded.

> Best,

> Matt Lampiasi

> On Nov 29, 2011, at 6:50 PM,
> hidden-discuss-request at lists.hidden-tech.net wrote:
> > m>
> 
> > Content-Type: text/plain; charset="iso-8859-1"
> 

> > Have a perplexing situation. We have 20 megabit down internet
> > service
> > from
> 
> > Comcast coming in to the front building of our place, gets passed
> > via
> > Cat 5
> 
> > probably 150 feet to a patch panel, which distributes it to
> > ethernet
> > ports
> 
> > in 5 or 6 rooms in the back building.
> 

> > Why would the connections in the rear building only provide 6-7
> > megabits?
> 
> > Could we replace switches or panels in the rear building to provide
> > more
> 
> > bandwidth to the individual connections? Or is the splitting of the
> > signal
> 
> > in the rear building the issue?
> 

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