Cisco Aironet 1250 Series

Quick Start Guide: Cisco Aironet 1250 Series Power Injector

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Table Of Contents


Before You Start

Regulatory Information



Additional Requirements

Installing the Power Injector

Checking the Power Injector LEDs

Mounting the Power Injector

Applicable Standards


This guide is designed to help you set up and connect your Cisco Aironet 1250 Series Power Injector (hereafter called the power injector) to a Cisco Aironet 1250 Series Access Point (hereafter called the access point).

Caution The 1250 series power injector has not been tested to the UL 2043 standard and should not be placed in a building's environmental air space, such as above suspended ceilings.

Caution The 1250 series power injectors are designed for an open-air environment. To avoid damaging the power injector, you must not bind together or stack multiple power injectors.

Before You Start

Additional instructions specific to installing the access point and power injector are covered in the Cisco Aironet 1250 Series Hardware Installation Guide, available on at this URL:

These documents contain useful information on configuring access points:

Cisco IOS Software Configuration Guide for Cisco Aironet Access Points—Provides detailed information for advanced configurations including power settings.

Cisco Aironet Command Reference for Cisco Aironet Access Points and Bridges—Lists all Cisco IOS commands with descriptions and syntax instructions including power settings.

Release Notes for Cisco Aironet Access Points and Bridges for Cisco IOS Release 12.4(21a)JA1—Provides system requirements, new feature descriptions, important notes, limitations, and last-minute updates. Any last-minute information about the power injector appears in these release notes.

These documents are also available on at this URL:

Regulatory Information

The following information is for FCC compliance of Class B devices:

The equipment described in this manual generates and may radiate radio-frequency energy. If it is not installed in accordance with Cisco's installation instructions, it may cause interference with radio and television reception. This equipment has been tested and found to comply with the limits for a Class B digital device in accordance with the specifications in part 15 of the FCC rules. These specifications are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation.

Modifying the equipment without Cisco's written authorization may result in the equipment no longer complying with FCC requirements for Class A or Class B digital devices. In that event, your right to use the equipment may be limited by FCC regulations, and you may be required to correct any interference to radio or television communications at your own expense.

You can determine whether your equipment is causing interference by turning it off. If the interference stops, it was probably caused by the Cisco equipment or one of its peripheral devices. If the equipment causes interference to radio or television reception, try to correct the interference by using one or more of the following measures:

Turn the television or radio antenna until the interference stops.

Move the equipment to one side or the other of the television or radio.

Move the equipment farther away from the television or radio.

Plug the equipment into an outlet that is on a different circuit from the television or radio. (That is, make certain the equipment and the television or radio are on circuits controlled by different circuit breakers or fuses.)

Modifications to this product not authorized by Cisco Systems, Inc. could void the FCC approval and negate your authority to operate the product.


Translated versions of the following safety warnings are provided in the Safety Warnings for Cisco Aironet 1250 Series Access Points document that ships with the access point.

Warning Read the installation instructions before connecting the system to the power source. Statement 1004

This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. Use the statement number provided at the end of each warning to locate its translation in the translated safety warnings that accompanied this device. Statement 1071


Warning Installation of the equipment must comply with local and national electrical codes. Statement 1074


The power injector increases wireless LAN deployment flexibility of the access point by providing an alternative powering option to local power, inline power-capable multiport switches, and multiport power patch panels.

The power injector combines 56-VDC power supplied by the external power supply) with the data signal, sending both to the access point. The power injector provides up to 30 W over the unused wire pairs of a Category 5 customer-supplied Ethernet cable, supplying enough power for a distance of 328 ft. (100 m).

A second customer-supplied Category 5 Ethernet cable connects the power injector to a 10/100/1000 Ethernet switch, hub, or network, and another cable carries power and data to the access point's or bridge's Ethernet port. The power injector's power supply connects to a wall outlet or power strip. The power injector can be mounted on most horizontal and vertical surfaces. However, power injectors must not be stacked on top of each other.

The following figure shows the key features of the power injector.


AP Power LED


Mounting tab


Fault LED


RJ-45 connection to access point (10/100/1000BASE-T)


AC Power LED


RJ-45 connection to switch (10/100/1000BASE-T)

The following figure shows the rear view of the power injector.


Mounting tab


Input AC power connector

Additional Requirements

Release notes for these products are on at this URL:

Note The Cisco Aironet 1250 Series Power Injector is not suitable for operation in a building's environmental air space and should not be installed in these environments.

Note The maximum distance that is supported for in-line power is 328 ft. (100 m), including the length of the 6.5-ft. (2-m) customer-supplied Ethernet cable.

Installing the Power Injector

To install the power injector, follow these steps:

Step 1 Plug a Category-5 Ethernet cable into the port on the power injector labeled To AP.

Step 2 Plug the other end of the Ethernet cable into the Ethernet Port on the access point.

Step 3 Plug a Category-5 Ethernet cable into the port on the power injector labeled To Switch.

Step 4 Plug the other end of the Ethernet cable into your 10/100/1000 Ethernet switch, hub, or network.

Step 5 Connect the female end of the supplied AC line cord into the AC receptacle on the power injector.

Step 6 Connect the other end of the line cord into an approved AC power source.

Step 7 Secure the power injector by mounting it to a vertical or horizontal surface using tie-wraps or using the keyhole mounting holes on the back of the unit.

Checking the Power Injector LEDs

You can use the AP Pwr, Fault, and AC Pwr LEDs to assess the unit status. Two indications are available: solid green or dark. The LED meanings are as follows:

AP Pwr LED—Turns solid green after successful discovery; indicates that the power injector is supplying power to the access point.

Fault LED—Turns solid red when a fault occurs during discovery mode or power-up.

AC Pwr LED—Turns solid green when the power injector is receiving AC power and is ready to provide power to the access point.

Mounting the Power Injector

You can mount both models to most vertical or horizontal surfaces. The power injector does not ship with a mounting kit. You must provide the fasteners for the surface on which you intend to mount the injector.

The power injector has two 1/8-in (3.1-mm) elongated mounting tabs, one on each end, that you can use to secure it to the surface. To mount the power injector using these tabs, you will need two #5 fasteners of the appropriate type for the surface on which you are mounting the power injector.

The following procedure may vary depending on the surface on which you mount the power injector. Also, it may be helpful to refer to the figure on page 8.

To mount the power injector on a horizontal or vertical surface, follow these steps:

Step 1 Use the power injector to mark the positions of the mounting tab holes on the surface where you want to mount the power injector.

Step 2 To mount the power injector using a conical wall anchor and screw, follow the steps below.

Drill a 3/16-in. (4.76-mm) hole at the locations you marked.

Install the wall anchor in the hole.

Insert a #5 fastener into the mounting tab holes. Tighten the screw just enough to keep it secure in the wall anchor.

Applicable Standards

Except where indicated, this device meets the following standards:

IEC 60950-1

UL 60950-1

CAN/CSA-C22.2 No. 60950-1

EN 60950-1

GB 4943-95