That's true. The 100m comes from the notion of having 90m between patch
panels and then two patch cords up to 5m each.
Anyway, to the original question: there's no expectation of being
limited to 100mbps at 100m.
Cat5e should run gigabit all the way to 100m (and often it works farther
as many have noted). Cat5e should run 10gig out to 45 meters.
Cat5e should run 2.5 Gbps out to 100 meters.
Cat5e /might /run 5Gbps out to 100 meters
Cat6 should run 10gig out to 55 meters.
Cat6 should run 2.5gbps and 5gbps out to 100 meters.
https://en.wikipedia.org/wiki/2.5GBASE-T_and_5GBASE-T
https://www.universalnetworks.co.uk/blog/10gbaset-can-this-be-run-over-cat5e/
On 1/14/2019 6:55 PM, Jay Weekley wrote:
Actually, the standards specify 90 meters for the long run with two
patch cords on either side that can be up to 5 meters long.
Ken Hohhof wrote:
There is a timing consideration if running half duplex, the guard
interval will not be sufficient if the cable distance is > 100 meters.
You may be able to go a little farther than 100 meters on cable with
excellent attenuation and crosstalk characteristics (e.g. Cat6) if
using full duplex.
*From:* AF <[email protected]> *On Behalf Of *Jesse DuPont
*Sent:* Monday, January 14, 2019 5:12 PM
*To:* AnimalFarm Microwave Users Group <[email protected]>;
[email protected]
*Subject:* Re: [AFMUG] Ethernet 100M Copper Limit
Well, I meant Ethernet generically. Regardless of 4-wire vs 8-wire,
in general, the purported safe distance for an Ethernet over copper
(as opposed to fiber) connection is 100 meters. What drives this safe
distance limitation spec?
*Jesse DuPont*
Network Architect
email: [email protected]
<mailto:[email protected]>
Celerity Networks LLC
Celerity Broadband LLC
Like us! facebook.com/celeritynetworksllc
Like us! facebook.com/celeritybroadband
On 1/14/19 4:03 PM, [email protected] <mailto:[email protected]> wrote:
I presume you are talking about 4 wire Ethernet because we do GigE
all the time on copper.
GigE uses all 8 wires and has data flowing both directions.
100 Mbps E uses 4 wires (2 pair) with TX on one pair and RX on the
other pair.
GigE uses advanced modulation methods as well.
Does that help?
*From:*Jesse DuPont
*Sent:*Monday, January 14, 2019 3:58 PM
*To:*AnimalFarm Microwave Users Group
*Subject:*[AFMUG] Ethernet 100M Copper Limit
I figured this was the best place to ask this question:
What is the primary reason for the 100M limit on copper Ethernet
links? Is it related to bit errors/SNR or is there a timing
element involved? Something else?
Thanks!
--
*Jesse DuPont*
Network Architect
email: [email protected]
<mailto:[email protected]>
Celerity Networks LLC
Celerity Broadband LLC
Like us! facebook.com/celeritynetworksllc
Like us! facebook.com/celeritybroadband
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