Powering AP's via POE switch or injector

Hi,
Could anyone please advise if there is any difference in the power supplied to a 1142N AP when using a power injector (AIR-PWRINJ3/AIR-PWRINJ4) compared to using poe on the switch port (2960S 24 port POE switch WS-C2960S-24PS-L).
Thanks.

but someone once advised that in order to get full N potential from the AP's you need injectors.
Someone got their facts wrong.
If I was to get the full potential with N, I'd look to plug the WAP into a GigabitEthernet port. PoE or Injector won't make any difference.

Similar Messages

Looking for an Access Point with 2 Ethernet ports and powered via PoE

Hi Gurus,
I am looking for an Access Point with 2 Ethernet ports and the access point can be powered via PoE. I have been assigned with a requirement where the rooms need to have access point as well as an Ethernet Cable provided from the Access Point as a backup for connectivity.
The room only has one data cable coming from the main IT room as well does not have a spare power socket to power the Access Point. Will be good if it can be centrally controlled or controller based.
Any recommendations?
Regards
J

For the backup plan, the cheapest solution may be to just run a couple new cat5e drops to the room(est cost $250). If not then purchase a small Cisco POE switch for the room(est cost $2k). For wireless I would purchase a POE enabled Cisco AP. But you will need to verify the POE switch/blade you will be connecting the AP to can power the AP you buy. I got burned by that issue when we purchased some Cisco 1251 AP's with dual radios and they needed more power than our 4500 POE blades could handle. We were told we would need to purchase new 48 port 10/100/1000 blades or power injectors. Our Cisco sales vendor took the heat for that mistake.
Posted by WebUser Steven Kinney from Cisco Support Community App

Catalyst 3560 24 port-PoE switch powers on but no STAT LED and console not responding

I rebooted my Catalyst 3560 24 port PoE switch and when it turned on only the STAT LED went green the other LEDs are off. I get no response from the console port using putty and the cable I used before this happened. I tested the cable on another switch and it works fine with putty. What can I do with this switch?

This unit was purchased before I came to our company. There is no support or maint contract. I'm sure the unit is several years old...we'll call the vendor and see what they'll do..not expecting much.

Cisco 1252s with regular 802.3af PoE switches - what are the impacts?

Does anyone have any real-life experience with deploying the 1252s on regular 802.3af PoE switches? I have a few 1252s one some 3560 PoE ports and the show up with "low power" alarms.
I am wondering what the real world impact is with this scenario. The 1252s have both 2.4 Ghz and 5.0 Ghz radios in them and I have HT enabled on the controller.
I'm wondering what capabilities I am losing by running on 802.3af power besides the annoyance of the alarms.
Thanks in advance!

Sorry in advance for the book I have just written.
I have three 1252s on 75 feet of Cat5e cable running to a 3560 PoE switch. Sometimes, but not always, I see a low power alarm on the access point(s). This is in a small building that is built like a fortress so the RF environment is somewhat challenging. I am watching WCS closely and see all three 2.4 GHz radios powered all the way up to power level 1. I notice that two of the 5GHz radios are on power level 1, and one is on level 3. I thought that RRM would not power anything down until you had at least four access points as RF neighbors. I believe I read that in a Ciscopress book and it seems to be true everywhere in our network when I look at buildings with 3 or less WAPs.
The building in question does not have any other buildings close by with any 5GHz radios in operation - or at least I didn't see any when I did the survey.
I'm wondering if the power setting of the radios is also related to the length of the Cat5e cabling. Seems to me a shorter run would have less resistance than longer runs, allowing the radio to have more power.
My main concern is not this building in question, since we went for coverage and not client density in the design. We several other buildings on the radar, all libraries, which are going to be both RF challenging (bookshelves, furniture, cubicles, cubbies) and client-density challenged. These buildings have hundreds of WLAN clients in them at times - and I mean devices, not just people.
Someone else told me (reputable source) that channel bonding is not an option when on 802.3af power. Makes sense, actually. I would never even think of bonding in the 2.4 GHz range for obvious reasons, but up in the 5GHz range it is a definate possibility in these buildings. Seems to be that we might be shooting ourselves in the foot by not using 802.3at power in these buildings.
If channel bonding is disabled and the upper two MCS rates (using 800ns guard interval) of 117 and 130 are disabled, then I'm looking at maximum MCS rate of 104 Mbit/s compared to 270 Mbit/s with 802.3at with channels bonded in the 5GHz range.

PoE for IP Phones and non PoE switches

Like everyone has already pointed out, a PoE device will need to be connected directly to a 802.3af compliant PoE switch. If you only have one jack for every workstation, then you will have to connect the phone to the wall/switch, and connect the computer to the phone. If you have separate data and voice vlans (like you should), 802.1q will need to be configured for the port as well.
PoE injectors are a great if you have them installed here and there, but if every port has one it will be a mess and PITA to work with since there will be double the Ethernet and as many power cords as you have injectors.
I stated 802.3af earlier because I've come across "PoE" devices (mainly from ubiquity) that still need an injector even though the switch is PoE.

I recently purchased a netgear PoE switch in order to power some IP phones we are going to implement into our office. The switch is with the router in our server room and I was wondering if power will continue through non poe switches. Each desk only has one ethernet port beside it and so in pretty much all our offices I have a 5 port switch so we can use multiple devices and printers and now these phones. Does anyone have any experience with PoE and dealing with non PoE switchs behind a PoE switch? much appreciated!
This topic first appeared in the Spiceworks Community

Using Cisco 7961 Phones with Linksys SRW208P POE Switch

I am having a problem getting our Cisco 7961 phones to work with a Linksys SRW208P POE switch. The internet works great , but when I connect a 7961 Cisco phone it hangs at the " configuring IP " screen. Are these model phones compatible with this switch? Any Ideas. Thank You!

I'm having a similar problem with the Cisco 7941G phones using a Linksys SLM224G4PS (with PoE). Did you ever get them to work?
The 7941Gs work with the plain Linksys SR224 and using power injectors, but not with the smart switch. It has nothing to do with the PoE, I've used the power injectors with the SLM224G4PS. It wasn't a current overload problem.
I've gotten the phones to work for somewhere between 10-40 seconds, which has given me enough time to find the IP address (DHCP) then pull up the web interface of the Cisco 7941G.
The phone on the SR244 had GARP enabled and Voice VLAN enabled and the operation, the phone on the SLM224G4PS had both disabled.
The working phone on the SR244 had a operational VLAN ID of 31, the non working phone on the SLM224G4PS didn't have any indicated.
I'm guessing that the root of the problem is the Voice VLAN, but tech support tells me that out of the box the switch should pass everything.
Apparently not so much...

CISCO 3850 PoE+ SWITCHES

Hi,
I have a device which work on PoE (IEEE802.3af).
Is it possible to sent the data + power to the PoE device by use of Cisco PoE+ (IEEE802.3at) i.e Could PoE+ Switches (IEEE802.3at) support the PoE Devices (IEEE802.3af).
Please help.
Thanks
Amey

See this:
3850 PoE, PoE+, and Cisco UPOE Ports
The PoE+ and Cisco Universal Power Over Ethernet (Cisco UPOE) ports use the same connectors as described in the "10/100/1000 Ethernet Ports" section.
They provide:
•PoE+ ports: Support for IEEE 802.3af-compliant powered devices (up to 15.4 W PoE per port) and support for IEEE 802.3at-compliant powered devices (up to 30 W PoE+ per port). The maximum total PoE power in a 1RU switch is 1800 W.
•Cisco UPOE ports: Support for powered devices on all four Ethernet signal pairs (up to 60 W Cisco UPOE per port).
•Support for Cisco-enhanced PoE.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3850/hardware/installation/guide/HIGOVERV.html#wp1351798

POE Switches vs Non POE Devices

hi, since we installed our new POE switches in different point of services (C2960X Software (C2960X-UNIVERSALK9-M), Version 15.0 (2) EX5).
Sometimes power is discovered on non POE devices..And do a reset on the interface..
Generally these devices are UNIX cash register. The easy way to remedy to this problem is to disable the POE ..But we will eventually needs POE on each interfaces..
Someone has an idea of why the switch detect a POE device even if he is not? .. Or any workaround suggestion, we only need POE on our CISCO POE devices, LLDP is globally disabled.
Mar 17 10:55:14.022 EDT: %ILPOWER-7-DETECT: Interface Gi1/0/28: Power Device detected: IEEE PD
Mar 17 10:55:17.189 EDT: %ILPOWER-5-POWER_GRANTED: Interface Gi1/0/28: Power granted
Mar 17 10:55:17.301 EDT: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/28: PD removed
Mar 17 10:55:18.325 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/28, changed state to down
Mar 17 10:55:20.335 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/28, changed state to up

Like everyone has already pointed out, a PoE device will need to be connected directly to a 802.3af compliant PoE switch. If you only have one jack for every workstation, then you will have to connect the phone to the wall/switch, and connect the computer to the phone. If you have separate data and voice vlans (like you should), 802.1q will need to be configured for the port as well.
PoE injectors are a great if you have them installed here and there, but if every port has one it will be a mess and PITA to work with since there will be double the Ethernet and as many power cords as you have injectors.
I stated 802.3af earlier because I've come across "PoE" devices (mainly from ubiquity) that still need an injector even though the switch is PoE.

POE switch for the LWAPP1142N

what poe switches will handle power requirements for the LWAPP1142N and not need any type of external power injector?

Broow,
Great read on the 1142.
http://www.cisco.com/en/US/customer/docs/wireless/access_point/1140/quick/guide/ap1140getstart.html#wp42177

Does Airport Express support multiple ethernet connections via a switch?

If I use the following configuration, with the Airport Express extending my network, will it handle multiple devices connected via a switch?
Modem---Airport Extreme- - -802.11n- - -Airport Express---Switch---multiple devices (eg. network printer and iMac).
Or do I need to use a second Airport Extreme instead?

It works for me—even when the AirPort Express device is configured to extend the wireless network created by the AirPort Extreme router.

Adding a PoE Switch to existing Network

Hello,
Currently we have a Linksys RV016 router with 3 Linksys SRW224G 24-Port Managed Switch. Can I add a PoE switch to my existing setup without any problems or I can only add none PoE switches?
If I can add a PoE switch is there a specific configuration or just plug and play?
Thanks,
B

Yes you can connect a PoE switch to the SRW224G switches but you will need to connect the PoE switch to a power supply. The only way that PoE (Power over Ethernet) will work is when you connect the PoE switch with another PoE switch. Only in this scenario, you won’t need to use a separate power supply for the PoE switch to work because it is getting its power form the first PoE switch / router.
Regarding if this will just be plug and play, it won’t be plug and play. If you have set up VLANs or other crucial settings in the other switches and you want it to manually set the PoE switch depending on the limitations you want for these PoE switches.

AP connected to PoE switch is not coming up

Hi,
I have one ap-1131ag which is connected to PoE switch is not coming up , I tried to enable under interface mode to respective interface where AP is connected with below command :
" Power Inline enable " but still no luck , is there any thing i need to enable or check at switch side ? :
SW1#sh power inline
Module   Available     Used     Remaining
          (Watts)     (Watts)    (Watts)
1             n/a        n/a         n/a
2             n/a        n/a         n/a
Interface Admin Oper       Power   Device              Class Max
                            (Watts)
Gi2/0/1   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/2   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/3   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/4   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/5   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/6   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/7   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/8   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/9   auto   off        0.0     n/a                 n/a   30.0
Gi2/0/10 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/11 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/12 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/13 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/14 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/15 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/16 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/17 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/18 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/19 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/20 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/21 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/22 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/23 auto   off        0.0     n/a                 n/a   30.0
Gi2/0/24 auto   off        0.0     n/a                 n/a   30.0
please suggest me .

Hi,
I have confirmed that , the switch where we are trying to connect is PoE switch :
please see model details below :
we have cisco switch 3750 stacking over there with one non-PoE switch :
switch 1 provision ws-c3750x-48 : non-PoE switch
switch 2 provision ws-c3750x-48p : PoE switch
both the switches are stacked :
please refer below stack-power details as well :
Power stack name: Powerstack-1
    Stack mode: Power sharing
    Switch 1:
        Power budget: 206
        Low port priority value: 21
        High port priority value: 12
        Switch priority value: 3
        Port 1 status: Connected
        Port 2 status: Connected
        Neighbor on port 1: 503d.e58a.be80
        Neighbor on port 2: 503d.e58a.be80
    Switch 2:
        Power budget: 102
        Low port priority value: 22
        High port priority value: 13
        Switch priority value: 4
        Port 1 status: Connected
        Port 2 status: Connected
        Neighbor on port 1: 503d.e543.7380
        Neighbor on port 2: 503d.e543.7380
After connecting Poe devices ( 1131AG ap ) to the switch , we are getting below message :
Error Message    PLATFORM_STACKPOWER-4-UNDER_BUDGET: Switch 2 does not have
sufficient power budget
I tried to paste the same output in output interpreter but there is no workaround given for the same.
Please suggest me for the same.
In the mean time, i will get details which leolahoo has mentioned .

Cisco 2960S FPS-L PoE switch with Avaya 9811g VOIP setup

Hello,
I am connecting a setup for data/voice connecting Catalyst 2960S-FPS-L PoE switch with Avaya 9811g series VOIP phone. As per my knowledge cisco switch works well with Cisco phone as it has got some builtin "Macros" and Intelligent PoE recognition when we connect device getting the details of another device through CDP. I understand I have to create data and voice vlan with QOS then enable trunking on the interface to other switch that is also 2960. Little confuse if is there any compatibility issues with Switch and Avaya phone regarding protocol/data/voice...?
Do I have to do PoE config for each port on the each interface?
any help or detail config will help.
Thanks in advance.

Hi I am back after good research. created two vlan data and voice with trunk on interface1/0/48 given below config..
connection b/w 2960s FPS Switch and Avaya 9611g IP Phone.
lldp/cdp is enable on switch
So I created this config if some one can take a look .
expert advise if something wrong?..
I am only concern with Voice and PoE as voice is my priority. do i have to map something for voice quality?
also if i create another Trunk port one allow voice other allow data both cable will go to switch will that be issue?
interface....
switchport access vlan x
switchport mode access
switchport nonegotiate
switchport voice vlan xx
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust cos
auto qos voip trust
spanning-tree portfast
interface ........
switchport trunk allowed vlan x,x
switchport mode trunk
switchport nonegotiate
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust cos
auto qos voip trust

Monitoring Power output on a POE switch

We just installed 12 AP's on a Cisco 3560 POE switch which currently has 6 AP's already connected to it.
The Customer is asking us to montior the power consumption on the switch.
What are the recommended methods for accomplishing this?
Thanks You for any input!

Kevin,
Have a look at this link:-
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/troubleshooting/g_power_over_ethernet.html#wp1002308
Sample outputs of what to look for
Regards,
Alex.
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My SGE 2000 24 port POE switch won't boot

Hi,
I have a sge 2000 24 port POE switch that won't boot, won't communicate on console or TCP/IP, and all of the port lights are lit up green. Holding down the reset button doesn't fix the issue and there aren't any lights illuminated on the left hand side of the switch. Do I have a future doorstop?
Any ideas?

Hi David, if you're unable to console the switch, there isn't an alternative recovery method. You should check the warranty by calling the SBSC to see if you're entitled to replacement.
-Tom
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Powering AP's via POE switch or injector

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