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sk1939
Premium Member
join:2010-10-23
Frederick, MD
ARRIS SB8200
Ubiquiti UDM-Pro
Juniper SRX320

1 recommendation

sk1939

Premium Member

802.11AC

5 things to know about 802.11AC

»www.zdnet.com/the-five-t ··· 0017112/

For the enterprise people, things they didn't tell you about second-gen 802.11AC.

»www.networkcomputing.com ··· 1234220?

The short version: 2nd generation 802.11ac will require two switch ports and two cable runs per access point. Simple AP uplinks now become port channels. Joy.
HELLFIRE
MVM
join:2009-11-25

HELLFIRE

MVM

So can anyone -- the 802.11ac committee, the WIFI Alliance, the HW vendors, Bob off the street, ANYONE?! -- explain
the obvious contradiction between this statement
quote:
802.11ac is not going to give you a Gigabit of throughput
and this statement?
quote:
is that second-wave 802.11ac APs will require two, not one, Gigabit Ethernet ports.
IIRC, I seem to recall statements to the effect 802.11n had but actually didn't need GigE interfaces.
Is it just a case of "scaling the uplink to the expected traffic patterns?"

Otherwise, a pretty good read, thx for sharing sk1939 See Profile

Regards

koolman2
Premium Member
join:2002-10-01
Anchorage, AK

koolman2 to sk1939

Premium Member

to sk1939
I don't understand why this would be necessary. Is it for higher throughput? If that's the reason, the push for widespread adoption of 10 Gbps Ethernet should be underway instead of this nightmare.

Weasel
Premium Member
join:2001-12-03
Minnesota

Weasel to sk1939

Premium Member

to sk1939
My only guesses would be either power needs (although that could be alleviated with PoE+), or one run for each radio (2.4Ghz and 5Ghz).

sk1939
Premium Member
join:2010-10-23
Frederick, MD
ARRIS SB8200
Ubiquiti UDM-Pro
Juniper SRX320

sk1939 to koolman2

Premium Member

to koolman2
said by koolman2:

I don't understand why this would be necessary. Is it for higher throughput? If that's the reason, the push for widespread adoption of 10 Gbps Ethernet should be underway instead of this nightmare.

As far the two port requirement, there are two possible reasons; power needs, although PoE+ provides 70W as it is I believe, and/or two radios.

Weasel
Premium Member
join:2001-12-03
Minnesota

Weasel

Premium Member

said by sk1939:

said by koolman2:

I don't understand why this would be necessary. Is it for higher throughput? If that's the reason, the push for widespread adoption of 10 Gbps Ethernet should be underway instead of this nightmare.

As far the two port requirement, there are two possible reasons; power needs, although PoE+ provides 70W as it is I believe, and/or two radios.

PoE+ provides 25w I believe per standard. Cisco I think has an Ultra PoE that can push 60w.

sk1939
Premium Member
join:2010-10-23
Frederick, MD
ARRIS SB8200
Ubiquiti UDM-Pro
Juniper SRX320

sk1939

Premium Member

said by Weasel:

said by sk1939:

said by koolman2:

I don't understand why this would be necessary. Is it for higher throughput? If that's the reason, the push for widespread adoption of 10 Gbps Ethernet should be underway instead of this nightmare.

As far the two port requirement, there are two possible reasons; power needs, although PoE+ provides 70W as it is I believe, and/or two radios.

PoE+ provides 25w I believe per standard. Cisco I think has an Ultra PoE that can push 60w.

Possible, although there are limitations on the wire that I forgot about. Given the voltage and size of the conductors, the limit is a maximum of 36W per pair, and 32W after 100m (factoring in voltage drop).

PoE
PoE Plus
UPOE

Minimum cable type
Cat5e
Cat5e
Cat5e

IEEE standard definition
802.3af
802.3at
Cisco proprietary

Maximum power per PSE port
15.4W
30W
60W

Maximum power to PD
12.95W
25.5W
51W

Twisted pair used
2-pair
2-pair
4-pair

koolman2
Premium Member
join:2002-10-01
Anchorage, AK

koolman2 to sk1939

Premium Member

to sk1939
So this would only apply to devices that get power via PoE. Devices that have a power cord would not.

sk1939
Premium Member
join:2010-10-23
Frederick, MD
ARRIS SB8200
Ubiquiti UDM-Pro
Juniper SRX320

sk1939

Premium Member

said by koolman2:

So this would only apply to devices that get power via PoE. Devices that have a power cord would not.

While the article is from an enterprise point of view (most installations of AP's are PoE) it remains to be seen if it is just a power requirement, or if there is something more to it.