Does patch-panels affect network speed?
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Posted by on June 20, 2008, 4:59 pm
Please log in for more thread options I am in the process of designing a mid-size network (~300 connections) and I play with the idea of having 2 levels of patch-panels. My physical design is based on the idea of not having to modify the servers room (walls, roof, floor, concretes, etc.) if new cables are eventualy required in the building. Between the server rooms and the building, we would therefore add "transit" patch-panels, with ease of access. The connections between the servers room panels and the "transit" panels will contain 576 wires to cover the expected cabling growth. All users devices would be connected to transit panels. Concretely speaking, it means that a desktop user will reach its switch trough 2 patch panels exept of one. Will that affect performances? You can take for granted that crimping will be done professionally and that all panels are cat 6. Thank you, B | ||||
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Posted by Doug McIntyre on June 20, 2008, 5:55 pm
Please log in for more thread options >My physical design is based on the idea of not having to modify the
>servers room (walls, roof, floor, concretes, etc.) if new cables are >eventualy required in the building. Between the server rooms and the >building, we would therefore add "transit" patch-panels, with ease of >access. The connections between the servers room panels and the >"transit" panels will contain 576 wires to cover the expected cabling >growth. All users devices would be connected to transit panels. >Concretely speaking, it means that a desktop user will reach its
>switch trough 2 patch panels exept of one. Will that affect >performances? You can take for granted that crimping will be done >professionally and that all panels are cat 6. Sounds like alot of money in ports and wires that won't ever be used, but thats your choice. I'd plan on extending my network out to the closet onto big workgroup switches. But, having 2 levels of patch-panels assuming they are properly done won't do anything to the speed. You could have 10 chained together (although not desireable), and the loss on each connector won't be enough to cause enough problems to cause negotiation problems. Ethernet is digital, it either works or doesn't (although maybe a extermely poorly done 100Mbps connection will fall back to 10Mbps because that speed is just so robust). I've seen some networks that have had 4-6 panels in between some points, no problems. | ||||
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Posted by on June 21, 2008, 9:46 am
Please log in for more thread options > Sounds like alot of money in ports and wires that won't ever be used,
> but thats your choice. I'd plan on extending my network out to the > closet onto big workgroup switches. I don't think money is a dramatic issue here. The building I am working on has 2 floors and we took the decision to construct 2 transits panels, with respectively 384 and 192 ports. The panels are placed into 4U hinged wall brackets. Total cost : 400$, plus the CAT6 wiring. Considering that this setup will avoid further fishing into the servers room walls (or, more dramatically, walls openings, sandblasting with prior removal of devices, etc.), this is well invested money. As for adding a switch in the transit zone, it is something I have always been against of. IMHO, switches and servers belong to a network room where one can centrally manage security and establish logical design. Exept for distances limitations (which does not apply in my case), I am opposed to any switching activities outside the central server/network room. > But, having 2 levels of patch-panels assuming they are properly done
> won't do anything to the speed. You could have 10 chained together > (although not desireable), and the loss on each connector won't be > enough to cause enough problems to cause negotiation problems. That's what I tought. | ||||
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Posted by on June 26, 2008, 9:38 pm
Please log in for more thread options >
> Ethernet is digital, it either works or doesn't (although maybe a > extermely poorly done 100Mbps connection will fall back to 10Mbps > because that speed is just so robust). No, it won't ever fall back. The speed negotiation is done (at 10 Mbps) based entirely on the capabilities of the devices at each end -- the quality of the connection between them doesn't enter into it at all. -- Larry Jones This sounds suspiciously like one of Dad's plots to build my character. -- Calvin | ||||
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Posted by Doug McIntyre on June 27, 2008, 1:05 am
Please log in for more thread options lawrence.jones@siemens.com writes:
>>
>> Ethernet is digital, it either works or doesn't (although maybe a >> extermely poorly done 100Mbps connection will fall back to 10Mbps >> because that speed is just so robust). >No, it won't ever fall back. The speed negotiation is done (at 10 Mbps)
>based entirely on the capabilities of the devices at each end -- the >quality of the connection between them doesn't enter into it at all. Except when all the newbies come around with their home-made cables with split pairs asking why their 100Mbps connections have failed to negotiate at 100Mbps and only at 10Mbps because of the degraded signal? Thats what I was saying, not in terms of something like a modem that tests the different frequency signal to noise response and fallsback appropriately. | ||||
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>and I play with the idea of having 2 levels of patch-panels.