Hi Damien,
I look at it this way, at some point there won't be data ports in dorm
rooms; there will be an AP per room. The major cost would be the APs,
not the switches. The APs won't likely be high-end 4-stream devices,
but more modest 2- or 3-stream ones. The main concern will be
availability & resiliency because no one will want to support the
infrastructure after hours. The wiring cost will be likely be amortized
out over 15-20 years, so while strictly speaking only one port/cable is
needed, the marginal cost of the additional port/cable will be
relatively negligible. Especially, if it's new construction.
-John
On 02/11/2014 09:30 AM, Cameron, Damien L. wrote:
Wouldn't switches with 10G access ports (also 10G uplink ports on AP)and
802.3at POE solve this issue?
I understand resiliency is a plus with two data drops, but with RRM I still
can't see the benefit of two data drops. Doubles cabling cost, and you still
need the switch ports to support it. I've searched to see if Cisco had any
switches with 10G access ports; however, I've only seen this in Nexus models
for the DC. I think I came across a switch by Arista that was 10G access. And
we know with the pace that technology changes those two data drops may not be
needed in the future.
Damien Cameron
Network Engineer
Norfolk State University
Office of Information Technology
Marie v. McDemmond Center for applied Research
Room 401
555 Park Avenue
Norfolk, VA 23504
O: (757) 823-9123
-----Original Message-----
From: The EDUCAUSE Wireless Issues Constituent Group Listserv
[mailto:[email protected]] On Behalf Of John Center
Sent: Tuesday, February 11, 2014 8:41 AM
To: [email protected]
Subject: Re: [WIRELESS-LAN] How many drops 802.11ac phase 2
Hi Bruce,
I was referring to the future 802.11ac phase 2 APs.
-John
On 02/11/2014 07:40 AM, Osborne, Bruce W (Network Services) wrote:
What brand of APs are you using? Aruba APs will only accept PoE from the first
Ethernet port.
Bruce Osborne
Network Engineer - Wireless Team
IT Network Services
(434) 592-4229
LIBERTY UNIVERSITY
Training Champions for Christ since 1971
-----Original Message-----
From: John Center [mailto:[email protected]]
Sent: Monday, February 10, 2014 5:44 PM
Subject: Re: How many drops 802.11ac phase 2
Hi Philippe,
Another reason for 2 drops is resiliency. I envision connecting the AP's 2 ports
to a 2-switch stack. We rarely see the need for redundant power supplies in an
edge switch, but have seen failure on a switch ASIC cause one or more ports to go
dead. With 2 connections, one switch having issues won't take out the AP. I think
LAG'g both ports across the stack & supporting LACP will become a future
requirement.
-John
--
John Center
Villanova University
On 02/07/2014 10:21 AM, Hanset, Philippe C wrote:
Is the main justification for two drops due to power/bandwidth/the-two?
With many services and most killer apps going to the cloud, I would
suspect that the bandwidth to the WAN is so limiting, that this
excess of capacity on Wireless is a complete overkill (a vendor
driven non-sense).
Yes, those 802.11ac Phase2 APs can generate a lot more than 1 Gbps,
but that's is shared bandwidth (half-duplex), and your uplink is 1
Gbps full-duplex (2 Gbps in Cisco math as we said in the old days).
So, you really plan to also uplink your switches with 40 Gbps, and
then a core at many times 100 Gbps, all connected to your ISP at a
few Gbps... something doesn't add up here.
Am I alone making bad accounting here?
Philippe Hanset
www.eduroam.us <http://www.eduroam.us>
On Feb 7, 2014, at 9:58 AM, James Robert Kennon <[email protected]
<mailto:[email protected]>>
wrote:
We just made a call on a new building and decided not to incur cost
of
2 cables per drop at this time. Hope we don't regret it later.
From: Lee H Badman <[email protected] <mailto:[email protected]>>
Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv
<[email protected]
<mailto:[email protected]>>
Date: Fri, 7 Feb 2014 14:56:31 +0000
To: <[email protected]
<mailto:[email protected]>>
Subject: Re: [WIRELESS-LAN] How many drops 802.11ac phase 2
We'll be running two, until some sanity emerges.
--------------------------------------------------------------------
-
---
*From:* The EDUCAUSE Wireless Issues Constituent Group Listserv
<[email protected]
<mailto:[email protected]>> on behalf of Brian
David <[email protected] <mailto:[email protected]>>
*Sent:* Friday, February 7, 2014 9:54 AM
*To:* [email protected]
<mailto:[email protected]>
*Subject:* [WIRELESS-LAN] How many drops 802.11ac phase 2
All,
I wanted to see how many people were planning on running 2 drops to
802.11ac phase 2 access points?
Currently we are just doing a one for one swap when replacing an
older a/b/g AP's with 802.11ac phase 1 AP's
When you have new construction, do you plan on running 2 drops so
when phase 2 come into play you will be all set for it?
*/Brian J David/*
*/Network Systems/*
*/Boston College/*
<image003.jpg>
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