Cisco Cisco Aironet 1310 Access Point Bridge 설치 가이드

The access point can be powered from a DC power source using the optional LR2T power injector. The 
following sections identify the maximum cable length that can be supported in these environments using 
a few different coax cable types. 

When choosing cables other than those shown in the following examples, take care to ensure that the RF 
characteristics of the new cable meets or exceeds the RF characteristics of the cable examples up to 
500 MHz. Also, be sure to use good quality cable connectors and grounding blocks such that the DC 
resistive losses associated with all the connections “combined” are less than 0.2 ohms.

Only trained and qualified personnel should be allowed to install, replace, or service this equipment. 
Statement 1030

The Cisco Aironet Power Injector LR2T must be used with a DC power source.

In battery power systems, a load-dump occurs when the battery is disconnected from the charging system 
while supplying power, and the devices connected to the battery system must dissipate the very large 
energy transient that is produced. For example, this situation can occur if the battery cables are loose or 
in a service shop where a mechanic accidentally removes the battery cable while the engine is running.

In order to comply with the transportation vehicle load-dump requirements specified in SAE 1211 and 
SAE1455 standards, you must use an external load-dump protection device. This device must be 
connected to the power cable between your vehicle’s battery system and the power injector.

You must install an external load-dump protection device in all vehicle systems that can experience a 
load-dump and that are supplying +24 VDC (or above) to the power injector.

For more information on load-dump protection devices, refer to Appendix I of the Cisco Aironet 1300 
Series Outdoor Access Point/Bridge Hardware Installation Guide. 

When using a DC power source, you are responsible for providing the power cable, fuse, and power 
connector used for the power injector. The power injector requires an external power supply capable of 
supplying 13 W of power at a typical vehicle battery voltage: +12 VDC, +24 VDC, or +40 VDC. For the 
power cable, the positive voltage is connected to the center pin and the return is connected to the external 
barrel of the power plug. 

A readily accessible two-poled disconnect device must be incorporated in the fixed wiring. 
Statement 1022

Connect the unit only to DC power source that complies with the safety extra-low voltage (SELV) 
requirements in IEC 60950 based safety standards. Statement 1033