Cisco Cisco Aironet 1310 Access Point Bridge Guía De Instalación
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Cisco Aironet 1300 Series Wireless Bridge Mounting Instructions
78-16136-02B0
Transportation-Vehicle Mounting
ENGLISH
Transportation-Vehicle Mounting
The bridge can be mounted on a moving vehicle such as a car, bus, truck, train, or boat and used to
communicate with another bridge. The vehicle must have a DC or AC power source for the bridge power
injector. The following sections identify the maximum cable length that can be supported in these
environments using a few different coax cable types.
communicate with another bridge. The vehicle must have a DC or AC power source for the bridge 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
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.
resistive losses associated with all the connections “combined” are less than 0.2 ohms.
Warning
Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Statement 1030
Statement 1030
Note
The Cisco Aironet Power Injector LR2T must be used in vehicles that provide DC power to the power
injector.
injector.
Electrical Load-Dump Protection
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.
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.
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.
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 F of the Cisco Aironet 1300
Series Wireless Bridge Hardware Installation Guide.
Series Wireless Bridge Hardware Installation Guide.
DC Power Cable and Connector
When mounting in a vehicle, 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.
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.
Warning
A readily accessible two-poled disconnect device must be incorporated in the fixed wiring.
Statement 1022