Re: [WIRELESS-LAN] Older Apple devices and issues with 802.11N(2.4Ghz)

[Dustin Howard]

I think the following would be interesting to share...

To recap - I found when I disable all 802.11N data rates on the Cisco 
1602i, 1602e, or 1702i radios and force these client to use B/G, they 
work as expected.  Once I enable any MCS data rates the problem presents 
itself. I think that proves the problem is related to 802.11N.


Knowing that I decided to do a packet capture on the crippled iPad 4th 
generation.  I noticed a trend of packets being retransmitted. In every 
instance, the packets that were retransmitted are 11 bytes larger than 
the packets that are not retransmitted.  After close comparison I 
noticed that all retransmitted packets include A-MPDU status in the 
radiotap header.  I just got done doing some testing tonight and found 
that if I disable A-MPDU support on the controller, everything works 
fine!  I went ahead and disabled both A-MPDU and A-MSDU frame 
aggregation for the 802.11b network until we have a resolution.


We experienced issues with Apple devices including iPad 3rd and 4th gen, 
iphone 5c and 5s, and some Macbook Pros.


Thanks,
Dustin Howard
Network Support Specialist
Information Technology Services
Truman State University
100 E. Normal Ave.
Kirksville, MO 63501
Office - (660) 785-4165
Cell - (660) 341-7869

On 07/17/2017 04:44 PM, Dustin Howard wrote:
Thank you for you reply.  I have tried a few different data rate 
combinations including 12 mandatory and lower ones disabled.  It 
didn't seem to help.


Thanks,
Dustin Howard
Network Support Specialist
Information Technology Services
Truman State University
100 E. Normal Ave.
Kirksville, MO 63501
Office - (660) 785-4165
Cell - (660) 341-7869

On 07/17/2017 04:10 PM, Thomas Carter wrote:
How are your data rates configured? I seem to recall something about 
Apple devices that used to be picky about it. We don't have Cisco, 
but we have 12 as Mandatory and everything lower disabled for NG.


Thomas Carter
Network & Operations Manager / IT
Austin College
900 North Grand Avenue
Sherman, TX 75090
Phone: 903-813-2564
www.austincollege.edu


-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dustin Howard

Sent: Monday, July 17, 2017 3:28 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Older Apple devices and issues with 
802.11N(2.4Ghz)


I'm having an issue with some Apple devices and was wondering if 
anybody has experienced similar or if you have a similar environment 
and all is working well...


My environment is 5508 controllers (8.0.140.17) with 1600 series and 
1702i APs.  We have 1242 AP so cannot upgrade past 8.0..


I am having an issue with what seems to be only older Apple devices 
on N(2.4Ghz).  The devices authenticate/DHCP just fine but are very 
slow and only seem to work for a few minutes until you have to 
restart the wireless card.  Loading a video is impossible...pings 
timeout and have very high latency.  Most the time the client cannot 
even ping the gateway.  I have been able to recreate this with iPad, 
3rd and 4th Generations, an older Macbook Pro and an iPhone 5c while 
using 1602i, 1602e, and 1702i APs.  I haven't confirmed any other 
brands having this problem.


The devices mentioned above work great if I disable the N data rates 
on the AP radio.  I had two users that were crippled with this issue, 
so I disabled the N data rates for one building over the weekend.  
The users said their devices worked great over the weekend.  They 
also work well on the 5Ghz band but we have areas that rely on the 
2.4Ghz coverage. If this issue is not resolved before school starts, 
then I'm afraid will have to disable N data rates globally for the 
2.4Ghz band.


Appreciate any feedback!

--
Thanks,
Dustin Howard
Network Support Specialist
Information Technology Services
Truman State University
100 E. Normal Ave.
Kirksville, MO 63501
Office - (660) 785-4165
Cell - (660) 341-7869

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RE: [WIRELESS-LAN] Backup power

[Thomas Carter]

I would ask why the connection between a UPS and maintenance contract? We have 
a mix of UPSes in important locations and *quality* surge supressors in others. 
We’ve had two switches fail due to power issues (out of roughly 100 on campus) 
over the past 5 years, and both were actually connected to a UPS (lightning 
strike killed the UPS and the switches behind it).

Thomas Carter
Network & Operations Manager / IT
Austin College
900 North Grand Avenue
Sherman, TX 75090
Phone: 903-813-2564
www.austincollege.edu

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Sandra Bury
Sent: Thursday, July 20, 2017 10:02 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Backup power

Good morning -

I would be interested to know how many of you include UPS purchases for 
switches in each network closet in your campus deployments. If you do not build 
in backup power, do you put your switches on a maintenance contract, or do you 
pay to replace them when they fail outside of warranty?

Thanks very much.

Sandy

Sandra H. Bury
Executive Director, Computing Services
Information Resources and Technology
Bradley University
309-677-2808
sa...@bradley.edu

[Image removed by sender.]

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Re: [WIRELESS-LAN] Cisco FRA APs

[Jeffrey D. Sessler]

In general, here are the important items.

  *   Make sure your 802.11a/n/ac and b/g/n DCA timers are at the default 10 
mins. This is critical since FRA uses the data from DCA runs to decide changes 
for the radio. If this runs only once every six hours, FRA will not be able to 
make an informed (correct) decision about the radio role.
  *   802.11a/n/ac and b/g/n must have the same RF group leaders, and those 
leaders must be controllers running the latest code.
  *   802.11a/n/ac DCA Channel Width should be set to “Best” – it’s helps 
maximize spectrum use. Even in our dense deployments, most WAPs run in 80 MHz.
  *   FRA – sent sensitivity to LOW, this sets the bar very high for 
determining a role switch for the radio.
  *   FRA – Interval of 1 Hour. This allows the fastest reaction to need.

Last but not least, proper deployment is key. If WAPs are in hallways, FRA is 
not going to work well at all since you’ll wind up with coverage holes for 
clients in rooms. If you are deploying in-room, FRA works wonderfully.

In my residential hall with 3800’s, very few WAPs pick 2.4 and many run dual 
5Ghz. The residential hall is 10-30x the bandwidth use of another similar res 
hall with 3700-series. It’s wireless only and I’ve had no complaints from the 
residents.

Jeff

From: "wireless-lan@listserv.educause.edu"  
on behalf of "bruce_entwis...@redlands.edu" 
Reply-To: "wireless-lan@listserv.educause.edu" 

Date: Thursday, July 20, 2017 at 11:47 AM
To: "wireless-lan@listserv.educause.edu" 
Subject: Re: [WIRELESS-LAN] Cisco FRA APs

We are currently running version 8.2.151.0 which looks to be the most recent 
8.2 release.

Thanks
Bruce


From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Luke Jenkins
Sent: Wednesday, July 19, 2017 4:57 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Cisco FRA APs

What code version are you using? I'd recommend the latest 8.2 maintenance 
release for anyone using FRA.

-Luke

On Tue, Jul 18, 2017 at 11:38 AM, Entwistle, Bruce 
> wrote:
This summer we remodels a residence hall and installed our first Cisco FRA APs, 
model 2802i.   The Radio Role Assignment on the APs is currently set to auto, 
and a few of the APs have changed to run both radios at 5GHz.  I was looking to 
see what others have observed and have found successful with this type of 
installation.

Thank you
Bruce Entwistle
Network Manager
University of Redlands

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--
=-=-=-=-=-=-=-=-=-=-=-=
Luke Jenkins
Senior Network Engineer
Weber State University
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Re: Backup power

[Sandra Bury]

Thanks for all of the thoughtful and expeditious responses!

*Sandra H. Bury*
Executive Director, Computing Services
Information Resources and Technology
Bradley University
309-677-2808
sa...@bradley.edu




On Thu, Jul 20, 2017 at 10:02 AM, Sandra Bury 
wrote:

> Good morning -
>
> I would be interested to know how many of you include UPS purchases for
> switches in each network closet in your campus deployments. If you do not
> build in backup power, do you put your switches on a maintenance contract,
> or do you pay to replace them when they fail outside of warranty?
>
> Thanks very much.
>
> Sandy
>
> *Sandra H. Bury*
> Executive Director, Computing Services
> Information Resources and Technology
> Bradley University
> 309-677-2808 <(309)%20677-2808>
> sa...@bradley.edu
>
>
>
>

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RE: [WIRELESS-LAN] Cisco FRA APs

[Entwistle, Bruce]

We are currently running version 8.2.151.0 which looks to be the most recent 
8.2 release.

Thanks
Bruce


From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Luke Jenkins
Sent: Wednesday, July 19, 2017 4:57 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Cisco FRA APs

What code version are you using? I'd recommend the latest 8.2 maintenance 
release for anyone using FRA.

-Luke

On Tue, Jul 18, 2017 at 11:38 AM, Entwistle, Bruce 
> wrote:
This summer we remodels a residence hall and installed our first Cisco FRA APs, 
model 2802i.   The Radio Role Assignment on the APs is currently set to auto, 
and a few of the APs have changed to run both radios at 5GHz.  I was looking to 
see what others have observed and have found successful with this type of 
installation.

Thank you
Bruce Entwistle
Network Manager
University of Redlands

** Participation and subscription information for this EDUCAUSE 
Constituent Group discussion list can be found at 
http://www.educause.edu/discuss.



--
=-=-=-=-=-=-=-=-=-=-=-=
Luke Jenkins
Senior Network Engineer
Weber State University
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Re: Backup power

[Green, William C]

We do not use UPSes generally.  Everyone’s situation is different.

Our electricity is very stable, and, for us, the UPSes cause more prolonged 
outages than the actual electrical outages.  So if a UPS is used (optional), 
the connected device must be either dual power supplied (with one bypassing the 
UPS) or an Automatic Transfer Switch must be included so there is a bypass 
around the UPS.  Yes, we’ve tried multiple brands of UPSes.  If our electricity 
were not stable, I might have a different approach.  We see UPSes mostly at 
remote sites where power is not stable.

Our university is mostly VoIP, but life-safety phones are on an analog plant.  
The hubs of that analog plant have battery and emergency power, so that 
operations can be sustained indefinitely in event of a primary electrical 
outage, or 6-8 ours for complete electrical outage (five locations instead of 
1,300 for UPSes on network equipment).  Far more time than is typically 
provided with UPSes, and more support of emergency situations.  Our university 
is fortunate to have a larger copper plant from earlier years which we reused.  
Remote sites of course don’t participate in that plant, and either have analog 
service from the local carrier, or, an analog gateway and network path with 
backup power depending on quantities/economics of the site.  I would have to 
run the numbers, but expect we’d have gateways per building before providing 
backup for all network switches if we did not have that copper plant.  [note,  
we don’t provide service to residence halls, those phones were removed years 
ago except for several employees where they are analog]

Other changing factors.  Many servers have moved to our Data Center, so there 
is less need for network when power goes in the buildings.  And the obvious 9X% 
have cell phones.


--
William C. Green  e-mail:  
gr...@austin.utexas.edu
Director, Networking and Telecommunications   phone:   +1 512-475-9295
ITS (Information Technology Services) fax: +1 512-471-2449
University of Texas
1 University Station Stop C3800
Austin, TX  78712


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RE: [WIRELESS-LAN] Backup power

[Chris Adams (IT)]

Sandra,

 

We are also an APC customer, but it looks like our parts differ a bit from 
others. We use the SMX1500RM2UNC model on our MDF/IDF locations. With the SMX 
series, X is for extended runtime and allow for additional battery packs to be 
added for more runtime. This part number also is a combo that comes with the 
network management card and costs less than piecing the APC + NMC together 
individually.

 

Most of our SMX1500RM2UNC are paired with at least 1 additional battery pack, 
APC PN# SMX48RMBP2U. I’ve attached a runtime graph to show how the additional 
packs improve runtime.

 

We use APC struxureware to not only monitor the units, but also to report on 
them as well as template their configurations. Configuring a few hundred NMC 
cards is tedious at best without the ability to template.

 



 

 

Thanks,

 

Chris Adams, CISSP

 

Assistant CIO, Network & Telecom

Division of Information Technology

University of North Georgia

E-Mail:   chris.ad...@ung.edu | Office: (706) 
867-2891

 

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Sandra Bury
Sent: Thursday, July 20, 2017 11:02 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Backup power

 

Good morning -

 

I would be interested to know how many of you include UPS purchases for 
switches in each network closet in your campus deployments. If you do not build 
in backup power, do you put your switches on a maintenance contract, or do you 
pay to replace them when they fail outside of warranty?

 

Thanks very much.

 

Sandy




Sandra H. Bury

Executive Director, Computing Services

Information Resources and Technology

Bradley University

309-677-2808

sa...@bradley.edu  

 

   

 

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smime.p7s
Description: S/MIME cryptographic signature

Re: [WIRELESS-LAN] Backup power

[Urrea, Nick]

I'm curious, what software do you use to manage your UPSs and if you could 
describe the setup (SNMP, something else) that would be very helpful to us at 
UC Hastings?


---
Nicholas Urrea
UC Hastings College of the Law
Director of Information and Network Security
Information Technology
e: urr...@uchastings.edu


From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
 on behalf of Hales, David 

Sent: Thursday, July 20, 2017 9:00:03 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Backup power

We size and install a UPS in every switch closet.  We have only a few models of 
switch and access point, so we built a spreadsheet to calculate our power load 
based on actual power draw observed in our lab.  We try to size our UPSes to 
provide a minimum of 15 minutes of uptime with 150% of their installed load.  
That gives us enough headroom for adding switches to existing stacks, or adding 
other PoE devices down the road.  Based on a 5-6 year replacement cycle, that 
sizing should be more than enough to keep up with any growth in load we might 
experience before the next cycle where we can resize for the load at that point 
in time.

We keep our distribution and core on service contracts, but we use limited 
lifetime hardware warranty on our access switches.  We keep enough spares on 
hand to handle the troubleshoot and cross ship transition for any that fail.  
Again, we only have a couple of models in production, so keeping spares on hand 
is a pretty low cost option.

David Hales
Network Systems Administrator
Information Technology Services
1010 N. Peachtree
Clement Hall 117
Cookeville, TN 38505
P 931-372-3983
F 931-372-6130
E dha...@tntech.edu
www.tntech.edu/its
[Tennessee Tech Logo]
[TTU Facebook]  [TTU Twitter]  
 [TTU Instagram]  
 [TTU Youtube]  
 [TTU Pintrest] 


From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Sandra Bury
Sent: Thursday, July 20, 2017 10:02 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Backup power

Good morning -

I would be interested to know how many of you include UPS purchases for 
switches in each network closet in your campus deployments. If you do not build 
in backup power, do you put your switches on a maintenance contract, or do you 
pay to replace them when they fail outside of warranty?

Thanks very much.

Sandy

Sandra H. Bury
Executive Director, Computing Services
Information Resources and Technology
Bradley University
309-677-2808
sa...@bradley.edu

[https://www.bradley.edu/global/images/emailsig_wordmark.gif]

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Re: [WIRELESS-LAN] Backup power

[Coehoorn, Joel]

In theory, we use UPS with all of our switch. In practice, while we always
have one when we deploy a new or replacement switch, the funding hasn't
been there for maintaining the batteries or replacing a UPS if it fails.



Joel Coehoorn
Director of Information Technology
402.363.5603
*jcoeho...@york.edu *

*Please contact helpd...@york.edu  for technical
assistance.*


The mission of York College is to transform lives through
Christ-centered education and to equip students for lifelong service to
God, family, and society

On Thu, Jul 20, 2017 at 11:00 AM, Hales, David  wrote:

> We size and install a UPS in every switch closet.  We have only a few
> models of switch and access point, so we built a spreadsheet to calculate
> our power load based on actual power draw observed in our lab.  We try to
> size our UPSes to provide a minimum of 15 minutes of uptime with 150% of
> their installed load.  That gives us enough headroom for adding switches to
> existing stacks, or adding other PoE devices down the road.  Based on a 5-6
> year replacement cycle, that sizing should be more than enough to keep up
> with any growth in load we might experience before the next cycle where we
> can resize for the load at that point in time.
>
>
>
> We keep our distribution and core on service contracts, but we use limited
> lifetime hardware warranty on our access switches.  We keep enough spares
> on hand to handle the troubleshoot and cross ship transition for any that
> fail.  Again, we only have a couple of models in production, so keeping
> spares on hand is a pretty low cost option.
>
>
>
> *David Hales*
>
> *Network Systems Administrator*
>
> *Information Technology Services*
>
> 1010 N. Peachtree
>
> Clement Hall 117
>
> Cookeville, TN 38505
>
> *P* 931-372-3983 <(931)%20372-3983>
>
> *F* 931-372-6130 <(931)%20372-6130>
>
> *E* *dha...@tntech.edu* 
>
> *www.tntech.edu/its* 
>
> *[image: Tennessee Tech Logo]* 
>
> *[image: TTU Facebook] * *[image:
> TTU Twitter] * *[image: TTU
> Instagram] * *[image: TTU
> Youtube] * *[image: TTU Pintrest]*
> 
>
>
>
> *From:* The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:
> WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] *On Behalf Of *Sandra Bury
> *Sent:* Thursday, July 20, 2017 10:02 AM
> *To:* WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
> *Subject:* [WIRELESS-LAN] Backup power
>
>
>
> Good morning -
>
>
>
> I would be interested to know how many of you include UPS purchases for
> switches in each network closet in your campus deployments. If you do not
> build in backup power, do you put your switches on a maintenance contract,
> or do you pay to replace them when they fail outside of warranty?
>
>
>
> Thanks very much.
>
>
>
> Sandy
>
>
> *Sandra H. Bury*
>
> Executive Director, Computing Services
>
> Information Resources and Technology
>
> Bradley University
>
> 309-677-2808 <(309)%20677-2808>
>
> sa...@bradley.edu
>
>
>
> *[image: https://www.bradley.edu/global/images/emailsig_wordmark.gif]*
>
>
>
> ** Participation and subscription information for this EDUCAUSE
> Constituent Group discussion list can be found at http://www.educause.edu/
> discuss.
> ** Participation and subscription information for this EDUCAUSE
> Constituent Group discussion list can be found at http://www.educause.edu/
> discuss.
>
>

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RE: [WIRELESS-LAN] Backup power

[Robert Owens]

We routinely put UPS's in our closets. One thing to keep in mind concerning 
reliability. Properly cooled closets tend to be more reliable and have longer 
battery life then closets with higher temperatures. We use management cards to 
monitor when they have a battery failure. Hot closets can have battery life 
under 1 year vs 6 years in a cool closet.

Bob Owens
Network Group
Kansas State University

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Eric Glinsky
Sent: Thursday, July 20, 2017 10:40 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Backup power

We have an APC Smart-UPS in every closet. Between VoIP, WiFi, paging, HVAC, 
door locks, and repeaters for 2-way radios, we can’t let a power glitch 
interrupt connectivity, especially since we’re in a rural area prone to 
brownouts and blackouts.

We’re also on a hill, prone to lightning strikes, which can go through the 
Cat5, circumventing the UPS. We had a strike last summer ruin one whole switch, 
several ports in a couple other switches, a couple IP cameras, an AP, and a 
copier NIC.

We carry warranties on all our Juniper switches on our main campus, however, 
our newly-acquired campus came with ProCurve switches with the lifetime 
warranty, so we may let the Juniper warranties lapse and replace them with HP 
as they die, with the exception of the core.


From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Sandra Bury
Sent: Thursday, July 20, 2017 11:02 AM
To: 
WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Backup power

Good morning -

I would be interested to know how many of you include UPS purchases for 
switches in each network closet in your campus deployments. If you do not build 
in backup power, do you put your switches on a maintenance contract, or do you 
pay to replace them when they fail outside of warranty?

Thanks very much.

Sandy

Sandra H. Bury
Executive Director, Computing Services
Information Resources and Technology
Bradley University
309-677-2808
sa...@bradley.edu

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Re: [WIRELESS-LAN] Backup power

[Julian Y Koh]

> On Jul 20, 2017, at 10:02, Sandra Bury  wrote:
> 
> I would be interested to know how many of you include UPS purchases for 
> switches in each network closet in your campus deployments.

We put our switches on UPS.  When a larger building UPS is available from 
facilities, we use that instead of small closet UPS units.  

> If you do not build in backup power, do you put your switches on a 
> maintenance contract, or do you pay to replace them when they fail outside of 
> warranty?
> 

We self-insure on switches and access points.  

-- 
Julian Y. Koh
Associate Director, Telecommunications and Network Services
Northwestern Information Technology

2001 Sheridan Road #G-166
Evanston, IL 60208
+1-847-467-5780
Northwestern IT Web Site: 
PGP Public Key: 

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RE: [WIRELESS-LAN] Backup power

[Eric Glinsky]

We have an APC Smart-UPS in every closet. Between VoIP, WiFi, paging, HVAC, 
door locks, and repeaters for 2-way radios, we can’t let a power glitch 
interrupt connectivity, especially since we’re in a rural area prone to 
brownouts and blackouts.

We’re also on a hill, prone to lightning strikes, which can go through the 
Cat5, circumventing the UPS. We had a strike last summer ruin one whole switch, 
several ports in a couple other switches, a couple IP cameras, an AP, and a 
copier NIC.
We carry warranties on all our Juniper switches on our main campus, however, 
our newly-acquired campus came with ProCurve switches with the lifetime 
warranty, so we may let the Juniper warranties lapse and replace them with HP 
as they die, with the exception of the core.


From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Sandra Bury
Sent: Thursday, July 20, 2017 11:02 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Backup power

Good morning -

I would be interested to know how many of you include UPS purchases for 
switches in each network closet in your campus deployments. If you do not build 
in backup power, do you put your switches on a maintenance contract, or do you 
pay to replace them when they fail outside of warranty?

Thanks very much.

Sandy

Sandra H. Bury
Executive Director, Computing Services
Information Resources and Technology
Bradley University
309-677-2808
sa...@bradley.edu

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Re: [WIRELESS-LAN] Backup power

[Lawson Cassels]

Power is extremely reliable on our campus, but we still try to provide 
battery backup for most of our switches (VOIP and life safety reasons). 
We have found that the small 1500-2200VA UPS units need battery swaps 
every 3 years and full replacement every 6-9 years if you want to 
guarantee 100% reliability. Without that strict (and expensive) UPS 
maintenance schedule, we were having more switch outages due to UPS 
issues than actual power outages. This is especially true when you only 
have a power outage every few years. We used APC and Tripp-Lite for the 
small units and found both to be reliable if maintained and replaced on 
a strict schedule.


We have had much better luck putting large 16kVA APC units in the 
basement of each building, then running 20A 220V outlets to each closet. 
The closets get a second 220V outlet on regular building power. The UPS 
sits behind the generator for the building, so backup power is 
essentially unlimited. That second non-UPS outlet in the closet prevents 
switches from being taken offline due to possible UPS issues in the 
future or generator ATS maintenance/malfunctions. The 16kVA modular UPS 
units have much more redundancy built into their systems and can be 
reliably kept is service much longer than the small units. We have been 
using these for around 15 years and have never had one fail, 
malfunction, or drop power to any piece of gear.


For small buildings with extremely reliable power, we have begun to 
phase out the small UPS units. The VOIP phones in those locations all 
get a sticker saying that they will not function during a power outage 
and everyone has cell phones now. Our switch gear is all Cisco with 
lifetime warranties. We keep an active contract for TAC cases and 
software updates though.


Lawson Cassels
Network Engineer
Infrastructure, Operations, and Networking
Illinois State University
p: 309-438-4318

On 7/20/2017 10:02 AM, Sandra Bury wrote:

Good morning -

I would be interested to know how many of you include UPS purchases 
for switches in each network closet in your campus deployments. If you 
do not build in backup power, do you put your switches on a 
maintenance contract, or do you pay to replace them when they fail 
outside of warranty?


Thanks very much.

Sandy

*Sandra H. Bury*
Executive Director, Computing Services
Information Resources and Technology
Bradley University
309-677-2808
sa...@bradley.edu 
/
/
/
/

** Participation and subscription information for this 
EDUCAUSE Constituent Group discussion list can be found at 
http://www.educause.edu/discuss.





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RE: [WIRELESS-LAN] Backup power

[Oliver, Jeff]

We have *almost* all of our network closets on centralized UPS (10 to 40 KVA) 
that is fed from an e-power circuit that has a emergency generator behind it. 
These units are on a maintenance contract and batteries are replaced on a 
regular schedule as required.

For the few closets are unable to participate in this, we use standalone UPS 
units. Not contract, but again we replace the batteries regularly. We have lost 
a couple of the standalone units over time but we do keep a spare unit for 
quick replacement.

Cheers,
Jeff

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dawn Douglass
Sent: Thursday, July 20, 2017 9:13 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Backup power

I always put every switch on a UPS.

On Thu, Jul 20, 2017 at 11:02 AM, Sandra Bury 
> wrote:
Good morning -

I would be interested to know how many of you include UPS purchases for 
switches in each network closet in your campus deployments. If you do not build 
in backup power, do you put your switches on a maintenance contract, or do you 
pay to replace them when they fail outside of warranty?

Thanks very much.

Sandy

Sandra H. Bury
Executive Director, Computing Services
Information Resources and Technology
Bradley University
309-677-2808
sa...@bradley.edu

[https://www.bradley.edu/global/images/emailsig_wordmark.gif]

** Participation and subscription information for this EDUCAUSE 
Constituent Group discussion list can be found at 
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Re: [WIRELESS-LAN] Backup power

[Dawn Douglass]

I always put every switch on a UPS.

On Thu, Jul 20, 2017 at 11:02 AM, Sandra Bury 
wrote:

> Good morning -
>
> I would be interested to know how many of you include UPS purchases for
> switches in each network closet in your campus deployments. If you do not
> build in backup power, do you put your switches on a maintenance contract,
> or do you pay to replace them when they fail outside of warranty?
>
> Thanks very much.
>
> Sandy
>
> *Sandra H. Bury*
> Executive Director, Computing Services
> Information Resources and Technology
> Bradley University
> 309-677-2808 <(309)%20677-2808>
> sa...@bradley.edu
>
>
>
> ** Participation and subscription information for this EDUCAUSE
> Constituent Group discussion list can be found at http://www.educause.edu/
> discuss.
>
>

**
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discussion list can be found at http://www.educause.edu/discuss.

RE: [WIRELESS-LAN] Backup power

[Tim Tyler]

It is a mixed bag for us.  We have over 80 closets on our campus.   If we
think a location has reliable power, we don’t bother and we just replace a
switch if something happens.  We did identify 5 residential buildings that
have unreliable power so we put UPS’s in them.   The other buildings
literally can stay up all 365 days.  Of course we always use USP’s in our
main computing centers and distribution points.   If by some chance a
switch were to actually get damaged, it is likely the vendor would replace
it for free anyways.   We keep a few spares to handle one or two buildings
quickly if ever necessary.   The economics of not having UPS’s everywhere
can sure buy a lot of switches and other things.  We are not Google or
Amazon so 100% reliability is not worth the cost to us at the edge.

Tim



*From:* The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:
WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] *On Behalf Of *Sandra Bury
*Sent:* Thursday, July 20, 2017 10:02 AM
*To:* WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
*Subject:* [WIRELESS-LAN] Backup power



Good morning -



I would be interested to know how many of you include UPS purchases for
switches in each network closet in your campus deployments. If you do not
build in backup power, do you put your switches on a maintenance contract,
or do you pay to replace them when they fail outside of warranty?



Thanks very much.



Sandy


*Sandra H. Bury*

Executive Director, Computing Services

Information Resources and Technology

Bradley University

309-677-2808

sa...@bradley.edu





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RE: [WIRELESS-LAN] Backup power

[Nero, Jason]

Sandy,

 We put UPS backup on every switch/stack on our 13 campuses to support VOIP 
phones in the event of a power outage for a minimum of 15 minutes. Some 
campuses have a generator, and the UPS is only there to buffer.

As for our switching, all edge switches are HP/Aruba which carry lifetime 
warranties.

Thanks
  Jason



Sent from my Verizon, Samsung Galaxy smartphone


 Original message 
From: Sandra Bury 
Date: 7/20/17 10:02 AM (GMT-06:00)
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Backup power

Good morning -

I would be interested to know how many of you include UPS purchases for 
switches in each network closet in your campus deployments. If you do not build 
in backup power, do you put your switches on a maintenance contract, or do you 
pay to replace them when they fail outside of warranty?

Thanks very much.

Sandy

Sandra H. Bury
Executive Director, Computing Services
Information Resources and Technology
Bradley University
309-677-2808
sa...@bradley.edu

[https://www.bradley.edu/global/images/emailsig_wordmark.gif]

** Participation and subscription information for this EDUCAUSE 
Constituent Group discussion list can be found at 
http://www.educause.edu/discuss.

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/discuss.

Backup power

[Sandra Bury]

Good morning -

I would be interested to know how many of you include UPS purchases for
switches in each network closet in your campus deployments. If you do not
build in backup power, do you put your switches on a maintenance contract,
or do you pay to replace them when they fail outside of warranty?

Thanks very much.

Sandy

*Sandra H. Bury*
Executive Director, Computing Services
Information Resources and Technology
Bradley University
309-677-2808
sa...@bradley.edu

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/discuss.