Maximum Cat5e or Cat6 Cable Length

Maximum Cat5e or Cat6 Cable Length
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Subject Author Date
Maximum Cat5e or Cat6 Cable Length Peter 02-16-2007
Posted by Peter on February 16, 2007, 3:48 pm
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What is the maximum recommended cable length for Cat5e or Cat6 cable from
the router/switch to a PC or other device on the network?

Peter
--

**Remove Xs to reply by e-mail**

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Posted by Walter Roberson on February 16, 2007, 4:29 pm
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>What is the maximum recommended cable length for Cat5e or Cat6 cable from
>the router/switch to a PC or other device on the network?

100 meters, same as always. The newer Cat cables do not have a design
point of getting the same signal further: they are designed to
be able to carry high speed signals the same length as the the target
of the slower signals.

It is true that with a good cable you could probably "get away with"
carrying a lower speed signal further, but the maximum *recommended*
is the same as always. If you need further than that, there is
fibre, or several manufacturers have "long reach ethernet" (LRE).

Posted by Robert Redelmeier on February 16, 2007, 4:30 pm
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> What is the maximum recommended cable length for Cat5e or Cat6
> cable from the router/switch to a PC or other device on the network?

Since this is CDLE, I presume you'e talking 10/100/1000baseT[X]

When people ask this question, they often intend to run that
cable outdoors. The recommended max distance is ZERO due to
lightening considerations. Run fiber.

Indoors, the recommended max is 100m (330 ft): 90m solid plus 10m
patchcord allowance. This holds for switched devices. There are
shorter limits (5m) if you're talking about 100baseTX hubs, if
you can find such a thing.

-- Robert


Posted by glen herrmannsfeldt on February 17, 2007, 3:05 am
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Robert Redelmeier wrote:

(snip)

> Indoors, the recommended max is 100m (330 ft): 90m solid plus 10m
> patchcord allowance. This holds for switched devices. There are
> shorter limits (5m) if you're talking about 100baseTX hubs, if
> you can find such a thing.

The limit isn't 5m, it is 205m wire and two repeaters.
The rules allow for 100m repeater to host, leaving 5m.
If you know the lengths are less than 100m, such as for a
small building, you can go over 5m.

-- glen


Posted by Walter Roberson on February 17, 2007, 10:47 am
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>Robert Redelmeier wrote:

>> Indoors, the recommended max is 100m (330 ft): 90m solid plus 10m
>> patchcord allowance. This holds for switched devices. There are
>> shorter limits (5m) if you're talking about 100baseTX hubs, if
>> you can find such a thing.

>The limit isn't 5m, it is 205m wire and two repeaters.
>The rules allow for 100m repeater to host, leaving 5m.

"repeater" pretty much implies half duplex, though, and if you are
using half-duplex then more complex rules apply about number of
repeaters and number of segments.

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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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