PoE standard (cisco ILP vs 802.3af)

I have CCNP switch official guide book, page 306 says below.
For cisco ILP, inline power is provided over data pairs 2 and 3 (RJ45 1,2 and 3,6)
For 802.3af power can be supplied in the same fashion (1 2 3 6) or over paris 1 and 4 (RJ45 4,5 and 7,8)
Can you give me when those bold option is used in terms of PoE?
Thanks.

I believe the 802.3af standard actually allows both pinout configurations.They are known as Mode A and Mode B. Mode A uses the data pairs while Mode B uses the "spare" pairs. I have always been under the impression that Mode A would be what one would find on devices that terminate a connection. For example, a Cisco Catalyst switch that provides 802.3af power will use the Data Tx/Rx pairs (pins 1,2,3,6). Further, my belief is that Mode B would be used by "mid-span" devices that insert power. For example, in-line power patch panels or in-line power injectors. These panels use the "spare" pairs to carry DC power (pins 4,5,7,8).
The equipment that provides the power (i.e. the power sourcing equipment) determines which Mode (i.e. pins) is used. The powered device that is 802.3af compliant must be capable of supporting both modes.
Here is a quick reference chart:
https://supportforums.cisco.com/docs/DOC-10259
The chart doesn't directly answer your question, but you may find it handy as you are getting a feel for the material.
HTH.
Regards,
Bill
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Similar Messages

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.

Aironet 1100 / 802.3af Power Over Ethernet (POE) Support

I was under the impression that the Aironet 1100 supports 802.3af POE. I purchased a NetGear FS108P POE switch, however, when I plug in the 1100, it does not receive any power.
I have seen references in the documentation to a Cisco inline power injector and a Cisco Catalyst switch that can provide POE to the 1100 and maybe they will work, however, will the 1100 only work with those devices?? If so, it would seem that the 1100 really doesn't support the 802.3af standard and that Cisco's implementation of POE is proprietary.
Any input would be appreciated.
Thanks,
Michael

Hi Michael,
As you have discovered (unfortunately) is that the 1100 only supports Cisco Pre-standard PoE :( Have a look;
Single 802.11g radio offering 54 Mbps of capacity
2.4 GHz integrated diversity dipole antennas
Available in an autonomous version only
16 MB of memory with 8 MB of storage
Operating temperature range of 32 to 104?F (0 to 40?C)
**Inline power support (Cisco pre-standard)**
From this doc;
http://www.cisco.com/en/US/products/hw/wireless/ps4570/prod_brochure0900aecd8035a015.html
The good news is that either of the options you listed will work just fine. I would go for the power injector probably just for neatness sake.
POWERING OPTIONS
The Cisco Aironet 1100 Series can be powered either locally using the AC-DC power adapter, or over the Ethernet cable when coupled with a device capable of delivering in-line power, such as an in-line power-capable Cisco Catalyst? switch, Catalyst in-line power patch panel, or Cisco Aironet Power Injector.
The AC-DC power adapter is included with the access point and can also be ordered as a spare part. The Cisco Aironet Power Injector can either be configured to the order or can be ordered separately.
You can use either;
AIR-PWR-A= Cisco Aironet Power Supply-Input 110-240VAC, Output 48VDC, 380 mA-for 1100 and 1200 Series
AIR-PWRINJ3= Cisco Aironet Power Injector for the 1100 and 1200 Series Access Points
From this doc;
http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_data_sheet0900aecd8045690f.html
Hope this helps! And good luck!
Rob
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SD208P PoE and Pre-Standard Cisco IP Phones (eg. 7960)

Well, I've been learning the eccentricities of Cisco's product lines the hard way! Here's my situation:
I've taken over for an office that has a hosted Cisco IP phone system using a variety of what seem to be older Cisco phones (the one at my desk is a 7960) these are normally powered by the PoE that gets delivered by some Cisco Catalyst 3750X switches. Our office has grown to the point where we've had to place a few people into some semi-jury rigged seats in areas with limited network drops. As a result I need to do something creative to get phones over there.
I first went out and purchased a small 8 port switch with 4 PoE ports on it from a competitor and this was where I discovered that the models of Cisco phones I had needed something generally referred to as Cisco Pre-Standard PoE (or some variation on that theme). I returned the switch and after doing some research decided to buy a Cisco SD208P switch, which a few messages out on the Interwebs led me to believe should be able to power the switch (possibly a firmware upgrade would be needed).
So I got the switch today, and plugged my phone into it and... nothing. No signs of life on the phone. (And nothing as simple as plugging it into one of the non-PoE ports on the switch). I went online to try and find a firmware update, and couldn't find anything. It's also an unmanaged switch, so I'm not even sure how I'd update firmware on it if I wanted to (and there's nothing in the manual).
I went back and double-checked some of the sources that may have led me to believe that this would work and I found what turned out to mostly be people recommending this as a possible option, but not strictly saying it worked for them. I found one person saying it worked for some Cisco phones, but he didn't specifically say they were prestandard ones. Lastly, there is mention of 200 and 300 series switches being firmware upgradable to support prestandard PoE, but from looking around Cisco's site I'm not 100% sure that this switch is actually part of the 200 series despite the number in the name. It seems to show up in a Small Business Unmanaged Switch category online rather than in any proper series.
So, the question is - have I just missed something somewhere? Is there any hope for me? Or do I have to send this back and go for something else? If so, what's recommended? Perferably something in that price range or we might just give in and... gasp... buy power supplies.
Thanks,
Chris.

Hi Chris,
The SD208P is an unmanaged switch that does not have any web interface and you will not be able to upgrade firmwares on this switch. The unmanaged switch that you have gotten will only support 802.3af POE standard and does not support the Cisco pre-standard. Also, you did mention the 200 and 300 series switches which are managed switches and with the latest firmware of 1.1.2.0, you will be able to power up your 7960 phones. The models are called SF200, SF300, SG200, and SG300. Please make sure to get the models with the letter "P" for POE. For example, you can get the SF300-24P. I hope this information is helpful.
Thanks,
Brian Ng

Is AIR-PWRINJ4 compatible to any 802.3af standard device?

Hi all,
today i have a special request to supportforum.
i'd like to know if AIR-PWRINJ4 supports any "non Cisco" 802.af device.
Is there any data sheet available for AIR-PWRINJ4?
Thanks for let me know.
Dieter

Hello.
Following this topic, I'd like to ask for help :-)
I have a CP-6921 and the switch where the phone is connected there is no PoE.
I've requested a Power Injector (CP-PWR-CUBE3) to sales team, but the delivery time is too far.
Meanwhile this, I'm wondering, can I attach the phone in a AIR-PWRINJ4= ?
I have one (spare).
It's 802.3af compliant, but in the part there is a label which contain:
OUTPUT: 56V ---- 0.55A
So, I got this doubt, is there any risk of damage the phone?
Any help will be welcome.
Thank you in advance.
Best

802.3af POE confusion

Does anyone know the 15.4W output power per user port in the current 802.3af is the min. or max.? I've seen conflicting info on different vendor's spec sheet. If it's the max., then why are some "802.3af" injectors outputting as much as 1A.

it is the max. 1 A POE can power multiple equipments.
yytellmey

PoE on Cisco Aieronet AP 2600

Hello experts,
I wanto know is it possible to plug a cisco aironet ap 2600 to a Cisco-Switch with PoE capabale port and give power to the Cisco AP-2600 through the switch port ? if yes , please let me know what is the exact switch part-number so that i can order one
Currently i have a Cisco Cat 3550-24 , does it support PoE??
Thanks for your comments

To expand on what Scott said:
Yes the AP can take POE from a switch. But you need one of the switches that support 802.3af. the 3550-24 if it's a pwr only supports the pre-standard 7w of power.
HTH,
Steve
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Clarifying 1250 802.3af operation

When installing 1250 AP on standard 802.3af PoE, according to the following: http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6973/ps8382/product_data_sheet0900aecd806b7c5c.html :
operation will be limited to a single transmitter per radio with maximum PHY data rates of 150 Mbps instead of 300 Mbps per radio
Just verifying that this means a "single" spatial stream, per Radio. In other words, the radio requires less power due to lowering the amount of spatial streams on both 2.4 and 5GHz radios. This effectively changes the spec. from a "2x3" to a "1x3" on each radio. 1 transmitter and 3 recievers.
Reducing the number of spatial streams (or "transmitters" as described in that document) reduces both overall power draw as well as throughput capability.
Is that technically accurate?

That is correct. The work around was either the AP having to reduce the transmission like you mentioned or a radio had to be removed.
Sent from Cisco Technical Support iPhone App

SF-302-08P will not power 802.3af/at device

I'm trying to power a Ruckus 7982 Access point using a Small Business SF-302-08P switch. Ruckus claims the AP is 802.3af and 802.3at compatible. The switch reports an overload.
#sh power inline fast 5
Port      Powered Device         State          Status    Priority   Class
fa5             2                 Auto          Fault       low     class0
Time range:
Power limit: 15.400W
Port Status:               Port is off - Overload state
Overload Counter:          23
Short Counter:             0
Denied Counter:            0
Absent Counter:            0
Invalid Signature Counter: 0
Here's what Ruckus' description of the PoE behavior of the 7982:
The 7982 advertises itself as a Class 4 PoE device (as do other enterprise class 3-stream APs), which is compatible with 802.3af and 802.3at switches.
802.3af switches re-classify a device with this behavior as 802.3af Class 0 (15.4W), and the vast majority of 802.3at switches classify it as 802.3at Type 1 (15.4W).
This implementation is intentional as it maintains compatibility with both 802.3af and 802.3at switches, and allows the 7982 to support full 802.3at power (>15.4W with a future firmware upgrade to support LLDP, if required).
Seems to me it should work. I updated to 1.3.0.62 - no change.

Hello,
     I didn't fully finish reading this post but read enough were I feel like this should be able to help you out.
https://supportforums.cisco.com/thread/2165089
So pretty much this should work just fine though since the switch can for sure handle 15.4Ws. May be some configurations you need to check our or some changes you may need to make.
Hope that helps you out.
Thanks,
Clayton Sill.

Cisco ISE for 802.1x (EAP-TLS)

I work for a banking organization and security is an area that needs to be improved continuously. I am planning on implementing Cisco ISE for 802.1x together with a Microsoft PKI for certificate issuing and signing.
I am currently trying to implement this in our test environment and I have managed to do a few basic bootstrapping tasks. I need someone to push me into the right direction as to how I can achieve what i am seeking.
I will use Cisco 2900 series switches on the access layer and a few HP switches as well which supports 802.1x.
I want to configure the ISE to process authentication requests using 802.1x EAP-TLS (Certificate Based). All the workstations on the domain needs to authenticate itself using the certificates issued to it by the Certificate Issuing Authority.
I have already managed to get the PKI working and have rolled out the certificates on all the workstations on the test environment. I can't seem to configure the Authentication portion on the ISE.
I request if someone can guide me or direct me to materials that can help achieve the above requirements. The guides available on the Cisco website are overwhelming and I can't seem to figure out how I am supposed to configure the authentication portion.
My email: [email protected]
Cheers,
Krishil Reddy

Hello Mubashir,
Many timers can be modified as needed in a deployment. Unless you are experiencing a specific problem where adjusting the timer may correct unwanted behavior, it is recommended to leave all timers at their default values except for the 802.1X transmit timer (tx-period).
The tx-period timer defaults to a value of 30 seconds. Leaving this value at 30 seconds provides a default wait of 90 seconds (3 x tx-period) before a switchport will begin the next method of authentication, and begin the MAB process for non-authenticating devices.
Based on numerous deployments, the best-practice recommendation is to set the tx-period value to 10 seconds to provide the optimal time for MAB devices. Setting the value below 10 seconds may result in the port moving to MAC authentication bypass too quickly.
Configure the tx-period timer.
C3750X(config-if-range)#dot1x timeout tx-period 10

Error in switch ports POE model, "Cisco Catalyst 2960S-24PS-L Switch"

I have problem with the poe switch Cisco Catalyst 2960S-24PS-L posts does not respond, and me the following error resporta was t
%PLATFORM_ENV-3-ILP_PORT_POST_ERR: %s can’t be brought up because it failed POST
in Inline Power test.
he source of that error and what are the possible causes

Hey Dustin,
Device needs to be RMA'ed. The inline power supply has failed.
HTH.
Regards,
RS.

What happens if 3700 with WSSI module is connected to 802.3af PoE port?

I know that the 3700 itself will drop to 3x4 MIMO if it only gets 15.4W of power (takes 16.8 with 4x4). If I add in a WSSI module, I know that is not enough power to run the WSSI module. We'd like to deploy our APs with the module installed and light up WSSI only as we get 802.3at power available. What I don't know is if the AP will light up as 3x4 with WSSI disabled, or if the AP will just completely fail. I should get a chance to test this soon, but if you happen to know, please tell!
Thanks!
Gary Hahn

If you have enough power to the AP, you can look at the GUI and under the main screen under Access Point Summary, you will see Dual-Band Radios... the WSSI or WSM will show up there.
Please rate helpful post and Cisco Support Community will donate to Kiva
Scotty

Extreme 802.11n support for POE 802.3af?

Can anyone confirm if the new (current) generation Airport Extreme 802.11n supports PoE installation? There was a special -- also called education -- version of the previous generation Extreme based station for POE installation.
thanks.
* Nevermind, found previous posts!

jheiliger, Welcome to the discussion area!
The new square 802.11b/g/n AirPort Extreme base station (AEBS) apparently does NOT support POE (Power over Ethernet).

PoE for Cisco 1242AG and 1310G Access Points

Dear All,
we purchased a Cisco 1242AG and a 1310G Access Point and in the DataSheet it was specified that these APs support Power-over-Ethernet. The problem is we don't see any RJ-45 port in either AP which could be used for connecting the AP to an PoE Switch. Can you please tell us how we can connect these APs to an 802.11af compatible PowerBridge (by Intermec) ? Thanks.

Hi Thorsten,
The 1242 should be good to go but the 1310 is powered quite differently. Have a look;
AP 1240 Series - Hardware (see diagram)
http://www.cisco.com/en/US/products/ps6521/products_installation_guide_chapter09186a008079b7f4.html#wp1071972
Connecting the Ethernet and Power Cables
http://www.cisco.com/en/US/products/ps6521/products_installation_guide_chapter09186a008079b7f4.html#wp1052781
1300 Series Power
Power
The access point/bridge receives inline power from the Cisco Aironet Power Injector (hereafter called the power injector). Dual-coax cables are used to provide Ethernet data and power from the power injector to the access point/bridge. The power injector is an external unit designed for operation in a sheltered environment, such as inside a building or vehicle. The power injector also functions as an Ethernet repeater by connecting to a Category 5 LAN backbone and using the dual-coax cable interface to the access point/bridge.
The power injector is available in two models:
Cisco Aironet Power Injector LR2 standard version (included with the access point/bridge)
48-VDC input power
Uses the 48-VDC power module (included with the access point/bridge)
Cisco Aironet Power Injector LR2T optional transportation version
12- to 40-VDC input power
Note The power injector and the power module must not be placed in an outdoor unprotected environment. The power module must not be placed in a building's environmental air space, such as above a suspended ceiling.
http://www.cisco.com/en/US/products/ps5861/products_installation_guide_chapter09186a008079b93b.html#wp1051840
Dual coaxial cable to run from the power injector to the 1300. See attached notes:
Cisco Aironet 1300 Series
Cisco Aironet 1300 Series Access Point/Bridge Power Injector
The Cisco Aironet 1300 Series Outdoor Access Point/Bridge Power Injector,converts the standard 10/100 BaseT Ethernet interface that is suitable for weather protected areas to a dual F-Type connector interface for coax cables that are more suitable for harsh outdoor environments. The Power Injector also provides power to the outdoor unit over the same cables with a power discover feature and surge protection. To support longer cable runs from your wireless network switch or router, the Power Injector LR is designed to accommodate up to a 100 meter coaxial cable run plus 100 meters of indoor cat5 cable?enabling total cable runs up to 200 meters. The Cisco Aironet 1300 Series Outdoor Access Point/Bridge ships with the Power Injector LR2 and an AC power supply.
From this link:
http://www.cisco.com/en/US/products/ps5861/products_data_sheet09186a008022551d.html
Cisco Aironet 1300 Series Outdoor Access Point/Bridge Hardware Installation Guide
Ethernet Ports
The access point/bridge dual-coax Ethernet ports consists of a pair of 75-ohm F-type connectors, linking the unit to your 100BASE-T Ethernet LAN through the power injector. The dual-coax cables are used to send and receive Ethernet data and to supply inline 48-VDC power from the power injector to the access point/bridge.
From this link:
http://www.cisco.com/en/US/products/ps5861/products_installation_guide_book09186a00804d3095.html
AIR-PWRINJ-BLR2
F-Type Connectors
Dual coaxial cable carries full-duplex Ethernet, DC power, and full-duplex console port (RS-232 connection)
From this link:
http://www.cisco.com/en/US/products/ps5861/products_data_sheet09186a00802252e1.html
Hope this helps!
Rob

Cisco IP 7841 802.1x Configuration

Hello Team,
I am working with a customer that requires 802.1x configured on their environment. Based on my research so far, I believe this is only way to make this work. Have any of you done this differently? Any feedback is greatly appreciated.
CUCM
Run the CTL Client to install the e-token so the CUCM Publisher can run the CAPF service
Export the Cisco_Root_CA cert and upload it to a Radius server (preferably Cisco ACS if possible) so the phones can authenticate with
Assign the cert to each phone that requires 802.1x authentication
LAN Switches
Stage the LAN switches without 802.1x so phones can retrieve the cert and complete the authentication before turning on 802.1x
Questions
Can phones be authenticated with its own MIC and the PCs with their own? Do phones and PCs have to run the same cert?
Is the MAB the only method to bypass the 802.1x phone authentication so only the PC can be authenticate via 802.1x without requiring the phone to do the 802.1x authentication?
Thanks in advance for your feedback,
Gerson

Jaime,
Thanks for pointing me to the correct area. By the way, do you have experience enabling 802.1x in CUCM? If so, do you think I am going in the right direction? Could you also provide some feedback on my questions?
Thanks,
Gerson

PoE standard (cisco ILP vs 802.3af)

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