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Topic: Can I Put Two LAN Circuits On One CAT 5 Cable?
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Marcel Birgelen
Film God
Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012
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posted 12-05-2014 04:47 PM
quote: Scott Norwood
It would still be possible to run two separate networks over a single run of copper if there are switches on either side that support VLAN trunking (802.1Q). At that point, though, the word "cheap" is no longer part of the discussion....
VLANs are no longer a high-end feature, they can be found in plenty of reasonably priced gear nowadays.
I've used HP 1700-8 (J9079A) switches for this on small scales. Those do have 8 ports, are web manageable and do support VLANs. They also don't have fans, which is great for in-office solutions, where you don't want noisy switches lying or hanging around.
There might even be cheaper options from Linksys, Netgear, Belkin, Sitecom, you name it. As long as they support 802.1Q VLANs you're fine.
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David Buckley
Jedi Master Film Handler
Posts: 525
From: Oxford, N. Canterbury, New Zealand
Registered: Aug 2004
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posted 12-17-2014 03:35 PM
quote: Carsten Kurz
Woah, you can buy a decent 5port Gigabit Switch for that money.
No, you can't - you can buy a dirt cheap switch for that price, with an ever cheaper power supply.
quote: Carsten Kurz
I can buy these passive port sharing adaptors locally for around 3€/piece.
Thats lucky then. I can get them cheap, but not locally, and, of course, we all support our local retailers, don't we ![[Smile]](smile.gif) And, time being money, I'd rather drive down the road and lose 20 bucks then lose an hour traveling to somewhere cheaper. Your mileage may, of course, vary.
quote: Marcel Birgelen
Personally, I wouldn't want to use those "Ethernet splitter plugs", as they're prone to create a highly confusing mess if you forget those things have been used. A switch is something most people are capable of comprehending.
OK, I'm an (ex) networking professional, and I can understand port splitters. I didn't realise that you have to be not "most people" to understand them. Perhaps I guessed wrong?
They certainly don't creeate a "confusing mess": under the desk in the kiosk there is less wiring and stuff with a port splitter than there is with a switch. And... less to go wrong.
quote: Marcel Birgelen
Also, running two 100Base/TX signals over one Cat5(e) wire is cheating the standard and increasing the chance for interference. While it will work in most cases, those standards are there for a reason.
If you are aware of a standard that port splitters "cheat", I'd like to hear about it. It certainly doesn't increase the chances of interference, and its a good job really, as there are networking cables with far more than the four pairs of copper that cat 5/6 uses.
Sure, one can put a toy switch under the counter, but it's a single point of failure that when it fails it'll take out both card machines. Or it could just have its wall wort knocked out when a box of ticket blanks is placed under the counter.
Fault-finding is more tedious, as with a toy switch there are two places to look at the blinking lights to figure out what has broken, rather than the one place if a splitter is used. (assuming a non-managed central switch; if the big switch is managed then the argument is even more pervasive)
Bottom line is this: if there were two network ports available then Jim would have used them without a second thought. As this is not possible, the question then becomes one of what is the least bad alternative? Given the circumstances of the installation, any networking professional would advise a port splitter solution. Using a toy switch brings no functional advantages (ie it doesn't work any better than the port splitter) and is more to go wrong. Its a no brainer.
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