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New Member

Patch cord length from switch to patch panel

Hi forum,

Is there a length limitation on patch cord used when patching from the switch to the patch panel? I was told that I cannot use patch code more than 3 meters long.

My intention is to centralized the patch panel and move all the switches to the mobile rack, but run the patch code from the switch at the mobile rack to the nearest patch panel.

Appreciate your advise,

py

7 REPLIES
Purple

Re: Patch cord length from switch to patch panel

Hi,

There is no such limitation that I am aware of. All you have to ensure is that the total cable length between your switch port and workstation is no more than 100m if using 10/100BaseT.

Paresh

Cisco Employee

Re: Patch cord length from switch to patch panel

Hi Paul,

It is recommended to use max 5 meters from switch to patch panel.

Regards,

Ankur

Purple

Re: Patch cord length from switch to patch panel

Hi Ankur,

Could you advise the basis for that recommendation ?

Thanks,

Paresh

Cisco Employee

Re: Patch cord length from switch to patch panel

Hey Paresh,

Howdy!! Long time. How are things?

To be frank I never reserached the basis but long time back I read some documents where cabling people follow some design and ground rules for ethernet where they states this distance. I still have that handy with me

http://www.ee.cooper.edu/EECP/files/ECE403/Ethernet%20Engineering%20Rules%20Part%201.pdf

Regards,

Ankur

Silver

Re: Patch cord length from switch to patch panel

As what PKHATRI states the only limitation is that you do not exceed the 100m length. You can have multiple patch panels in line between the switch and device. Do not exceed the 100m length.

Green

Re: Patch cord length from switch to patch panel

The EIA/TIA guideline is:

100 meters total end-to-end

COMPOSED OF

90 Meters of solid conductor cabling "in the wall"

WITH

*Up to* 5 meters of "jumper cordage" at either end.

Jumpers are made with stranded conductors and impose more attenuation, are more susceptable to noise, and have less impedednce consistancy along the length.

The "In the Wall" cabling is solid conductor cabling ... it doesn't make good jumpers because flexion and torsion will displace the conductors more easily (which can corrupt the impedence and other transmission characteristics) ... and breaks quicker if you bend it enough.

So, 90 meters of cabling In the Wall, up to 5 meters of flexible jumper at either or both ends = 100 meters.

Note1: Running longs lengths of stranded conductor is "bad" too much attenuation, too much noise, more crosstalk

Note2: The EIA / TIA "rules" are guidelines, "Rules of Thumb" ... if you follow the guidelines, your system is almost certainly going to work ... if you meet the specs (attenuation, crosstalk (NeXT, FeXT, Power Sum, etc) ... then cable length is irrelevent *IF* you can hit the specs for the given category rating.

Note3: These are generic specs for copper structured cabling, regardless of the Category (3, 4, 5, 5e, 6 {and beyond}).

Note4: Don't assume that Shielded Cat{anything}(sometimes called Screened UTP) is better than unshielded. Unless the shielded / screened cabling is terminated properly, you might as well be using barbed wire fencing ... improperly terminated shielded / screened is worse than plain ol' phone wire. UTP and modern Ethernet/ Fast Ethernet / GigE transceivers are much better these days and can handle common mode noise (like 50/60 Hz) easily. There are very few circumstances where shielded cabling is needed.

Hope this helps ...

Good Luck

Scott

New Member

Re: Patch cord length from switch to patch panel

Hi everyone,

Thank you very much. This is really helpful.

Thank you,

py

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