Contents

Introduction

PoE Standards

Power Cisco Access Points

Compatible Power Injectors and DC Power Supplies

Compatible PoE Standards

Troubleshoot

Verify Switch Power Budget

Verify Power Negotiation

Common Issues Cisco TAC Encounters

Related Information

Introduction

This document describes different Power over Ethernet standards, lists power requirements, and compatible power supplies for Cisco Access Points (AP).

PoE Standards

Power over Ethernet (PoE) refers to the system where electrical power is transferred along with data via twisted pair Ethernet cabling. The convenience of PoE allows Cisco APs to use a single cable to provide both power and data, which makes deployments much more cost-effective.

As of 2020, there are four Powers over Ethernet standards utilized by Cisco access points. This table lists them along with their characteristics:

Table 1. PoE Standards

Codename

Maximum Power [W]

IEEE Standard

PoE

15.4

802.3af

PoE+

30

802.3at

UPoE

60

Cisco proprietary

UPoE+

90

802.3bt

Power Cisco Access Points

There is no power difference between different regulatory domains of the same AP model. For example, Cisco 4800I-E and 4800I-S have identical power draw and power requirements.

Compatible Power Injectors and DC Power Supplies

Table 2. lists all officially supported PoE injectors for the latest Cisco AP models:

Table 2. Power Injectors and DC Power Adapters

AP Model

PoE Injectors

AC/DC Power Adapter

9124

AIR-PWRINJ-60RGD1= (full power), AIR-PWRINJ-60RGD2= (full power), AIR-PWRINJ6= (medium power)

Auxiliary DC input, 24V to 56V support 60W, model not specified in data sheet

9166

AIR-PWRINJ7= (full power), AIR-PWRINJ6= (medium power),MA-INJ-6 (full power)

MA-PWR-50WAC (full power)

9164

AIR-PWRINJ7= (full power), AIR-PWRINJ6= (medium power),MA-INJ-6 (full power)

MA-PWR-50WAC (full power)

9162

AIR-PWRINJ7= (full power), AIR-PWRINJ6= (full power), MA-INJ-6 (full power)

MA-PWR-30W (full power)

9136

AIR-PWRINJ7= (full power)

X

9130

AIR-PWRINJ6= (full power), AIR-PWRINJ5= (medium power)

X

9124

AIR-PWRINJ6= (medium power), AIR-PWRINJ-60RGD1= (full power), AIR-PWRINJ-60RGD2= (full power), AIR-PWRINJ7= (full power)

X

9120

AIR-PWRINJ6= (full power), AIR-PWRINJ5= (medium power)

X

9117

AIR-PWRINJ6= (full power), AIR-PWRINJ5= (medium power)

X

9115

AIR-PWRINJ6= (full power), AIR-PWRINJ5= (medium power)

X

9105

AIR-PWRINJ6= (full power), AIR-PWRINJ5= (medium power)

X

4800

AIR-PWRINJ6= (full power)

AIR-PWR-50= (full power)

3800

AIR-PWRINJ6= (full power)

AIR-PWR-50= (full power)

2800

AIR-PWRINJ6= (full power)

X

3700

AIR-PWRINJ6= (full power), AIR-PWRINJ4= (medium power)

AIR-PWR-B= (full power)

2700

AIR-PWRINJ6= (full power), AIR-PWRINJ4= (full power)

AIR-PWR-C= (full power), AIR-PWR-D= (full power)

1700

AIR-PWRINJ5= (full power)

AIR-PWR-C= (full power), AIR-PWR-D= (full power)

1850

AIR-PWRINJ4= (full power), AIR-PWRINJ5= (medium power)

AIR-PWR-C= (full power)

1840

AIR-PWRINJ6= (full power), AIR-PWRINJ5= (medium power)

X

1830

AIR-PWRINJ6= (full power), AIR-PWRINJ5= (medium power)

AIR-PWR-C= (full power)

1815i and 1815m

AIR-PWRINJ6= (full power), AIR-PWRINJ5= (full power)

X

1815t

X

AIR-PWR-D= (full power)

1815w

AIR-PWRINJ6= (full power), AIR-PWRINJ5= (full power)

X

1810

AIR-PWRINJ6= (full power), AIR-PWRINJ5= (full power)

AIR-PWR-D= (full power)

1572

AIR-PWRINJ1500-2= (full power)

1562I

AIR-PWRINJ-60RGD1= (full power),AIR-PWRINJ-60RGD2= (full power), AIR-PWRINJ6= (medium power)

AIR-PWRADPT-RGD1= (full power)

1562E and 1562D

AIR-PWRINJ-60RGD1 = (full power), AIR-PWRINJ-60RGD2 = (full power), AIR-PWRINJ6 = (full power)

AIR-PWRADPT-RGD1 = (full power)

1542

AIR-PWRINJ-60RGD1 = (full power), AIR-PWRINJ-60RGD2 = (full power), AIR-PWRINJ6 = (full power), AIR-PWRINJ5 = (full power)

X

IW6300

AIR-PWRINJ6 = (full power)

IW-6300H-AC-X-K9 (full power), IW-6300H-DC-X–K9 (full power), IW-6300H-DCW-X-K9 (full power)

IW3700

AIR-PWRINJ1500-2 = (full power), AIR-PWRINJ-60RGD1 = (full power), AIR-PWRINJ-60RGD2 = (full power)

AIR-PWRADPT3700NA = (full power), AIR-PWRADPT3700IN = (full power)

Compatible PoE Standards

Table 3. contains information about what features are available when APs are powered with the use of different PoE standards. As of this article last update, all APs have full functionality with UPoE+ standard (802.3bt), so it is not included in the table. This table assumes that no PoE passthrough (PoE Out) is used.

Note: Unless APs are provided the full power they require, they show up with a  Low/Medium Power in Wireless Controller Web interface.

Table 3. Compatible PoE Standards

AP Model

Max Power Draw [W]

If powered with UPOE

If powered with PoE+

If powered with PoE

9124

TBD (Not published in the datasheet)

Full functionality

2.4GHz & 5GHz radios at 2x2, 6GHz radio shut down, Multigigabit port speed 1000mbps, SFP port disabled, PoE out disabled, Downlink ethernet interface enabled

Multigigabit port speed 1000mbps, all radios are shut down, SFP port disabled, PoE out disabled, Downlink GigabitEthernet interface disabled

9166

30.5

Full functionality

USB port disabled

Multigigabit port speed 1000mbps, all radios are shut down, USB port disabled

9164

30

Full functionality

USB port disabled

Multigigabit port speed 1000mbps, all radios are shut down, USB port disabled

9162

25.5

Full functionality

Full functionality

2.4 GHz radio disabled 5GHz & 6GHz radios at 1x1, Multigigabit port speed 1000mbps, USB port disabled

9136

47.3

Full functionality

2.4GHz radio at 2x2, 5GHz radio at 4x4, 6GHz radio at 2x2, Multigigabit port speed 2.5gbps, second multigigabit port disabled, USB port disabled

Multigigabit port speed 1000mbps, all radios are shut down, USB port disabled

9130

30.5

Full functionality

Before 17.10: USB port disabled, 17.10 and later: full functionality

USB port disabled, ethernet port speed 1000mbps, both radios at 1x1

9124

TBD (Not published in the datasheet)

Full functionality

Multigigabit port speed 1000mbps, both radios at 2x2, SFP port disabled, PoE out disabled (AUX port still operational for data)

Multigigabit port speed 1000mbps, both radios disabled, SFP port disabled, PoE out/AUX port disabled

9120

25.5

Full functionality

Full functionality

USB port disabled, ethernet port speed 1000mbps, with both radios at 1x1 or one of the radios on 2x2 with another one disabled

9117

28.9

Full functionality

If the USB port is enabled, the 5GHz radio is reduced to 4x4

USB port disabled, ethernet port speed 2500mbps, both radios at 2x2

9115

21.4

Full functionality

Full functionality

USB port disabled, ethernet port speed 1000mbps, both radios at 2x2

9105

TBD (Not published in the datasheet)

Full functionality

Full functionality

USB port disabled, PoE out disabled

4800

31

Full functionality

USB port disabled, primary ethernet port speed 1000mbps, second AUX ethernet port disabled

AP does not power on

3800

30

Full functionality

Full functionality

Both radios are shut down, but AP powers up and is able to join WLC

2800

26.5

Full functionality

Full functionality

Both radios are shut down, but AP powers up and is able to join WLC

3700

19.6

Full functionality

Full functionality

Both radios at 3x3 without Wireless Security Module (WSM) or both radios at 2x2 with WSM

2700

15

Full functionality

Full functionality

Both radios at 3x3

1700

15

Full functionality

Full functionality

Full functionality

1850

20.9

Full functionality

Full functionality

USB port disabled, AUX ethernet port disabled, 2.4 GHz radio at 2x3

1840

17.8

Full functionality

Full functionality

USB port disabled

1830

15.4

Full functionality

Full functionality

USB port disabled

1815i & 1815w

8.5

Full functionality

Full functionality

Full functionality

1815m

13.9

Full functionality

Full functionality

Full functionality

1810

15.4

Full functionality

Full functionality

Full functionality

1572

31

No PoE out

AP does not power up

AP does not power up

1562i

32

Full functionality

Both radios at 2x2

Both radios are shut down, but AP powers up and is able to join WLC

1562e & 1562d

25

Full functionality

Full functionality

Both radios are shut down, but AP powers up and is able to join WLC

1542

13.9

Full functionality

Full functionality

Full functionality

IW6300

28

No PoE out

No PoE out

AP does not power up

IW3700

30

1 heater active, no PoE out

1 heater active, no PoE out

No heaters are active, and both radios are at 2x2

Note: For additional information about each AP model refer to their data sheets and the installation guides.

Troubleshoot

Verify Switch Power Budget

These switch commands display the current switch, port, power allocation, and budget:

Switch#show power inline

Module   Available     Used     Remaining

(Watts)     (Watts)    (Watts)

------   ---------   --------   ---------

1           472.0      344.5       127.5

Interface Admin  Oper       Power   Device              Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Gi1/0/1   auto   on         25.5    C9120AXI-A          4     30.0

Gi1/0/2   auto   on         25.5    C9120AXI-A          4     30.0

Gi1/0/3   auto   on         25.5    C9120AXI-A          4     30.0

Gi1/0/4   auto   on         25.5    C9120AXI-A          4     30.0

...

Verify Power Negotiation

The default interface configuration works well in most deployments provided there is enough power budget, and the switch supports the minimum PoE standard requirement for a given AP model.

Particular caution has to be paid when you deal with power requirements greater than PoE (802.3af), as either CDP or LLDP needs to remain enabled (both globally and on the port level) to ensure proper power negotiation with the connected AP.

Ensure these options are not disabled (these commands are not visible in a normal running configuration as they are there by default):

Switch(config)#cdp advertise-v2

Switch(config)#interface GigabitEthernet1/0/1

Switch(config-if)#cdp enable

To verify if CDP is enabled you can use this command:

Switch#show cdp

Global CDP information:

Sending CDP packets every 60 seconds

Sending a holdtime value of 180 seconds

Sending CDPv2 advertisements is  enabled

Common Issues Cisco TAC Encounters

- Power an Access Point with PoE standard that does not provide enough power that it requires and results in AP showing up in the WLC web interface with a  Low/Medium Power . In some cases, this results in a non-functional AP that cannot even turn on its radios (for example, when 3800 AP is powered with the use of 802.3af), or it can result in reduced performance (for example, when 9115 AP is powered with the use of 802.11af and radios fall back to 2x2). Please take a look at Table 3. for the exact behavior of each AP model.

- Not all APs from the same series have the same power draw. For example, the 1562i can draw up to seven watts more than the 1562d version.

- Connecting AP to the power source with the use of a very long or non-certified cable can result in a higher power draw at the power source.

- When you use external or industrial APs, it is crucial to ground them. Refer to the 'AP deployment guides' for further information on the results of not properly grounding the AP.

- When you use power injectors, it is impossible to have mGig port speeds higher than 1000 Mbps.

Related Information

- Cisco Technical Support & Downloads