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Community Member

Aironet 1400 Bridge Coax max length

I just recieved my 1400 bridges, and was surprised when they had a dual coax feed from the power injector. I was lead to believe that it would take a cat5 cable. It shipped with both a 20' and a 50' cable that you can connect with a grouding coupler. At one of my sites, I will need more than this distance to get into the building and to my closet. I could not find any specs on the distance limitations for this coax connection. Any help would be appreciated.

3 REPLIES
Cisco Employee

Re: Aironet 1400 Bridge Coax max length

You can order upto 100Ft cables

part number AIR-CAB100DRG6-F

I would not exceed this as you will start to encounter a lot of loss

Here is the data sheet

http://www.cisco.com/en/US/products/hw/wireless/ps5279/products_data_sheet09186a0080184974.html

Community Member

Re: Aironet 1400 Bridge Coax max length

You can use regular 75 ohm coax and extend up to 300ft or 100meters. I have it running well at 150 ft now.

Green

Re: Aironet 1400 Bridge Coax max length

DC power is very lossy; over-extending the coax feeding the unit power may result in marginal operation and ultimately smoke the unit as it tries to compensate for the loss.

It is a function of the ohmic resistance of the cable and the voltage applied. Meaning: even if you added a power injector with a higher current output, it wouldn't change the power level at the roof-mounted unit (Current = voltage / resistance).

Coax would be the better choice for power any serious distance, the larger conductor (larger than Cat-rated UTP) should have less loss and, if installed properly, accept and radiate less noise.

The major drawback to a copper connection to the roof is lightning. If you run a solid copper link from your closet / data center to the roof, you're inviting the lightning into your data center.

IMO, you'd do better to get a power source close to the roof-mount location (with commercial power-overload protection), and bring the Ethernet into the data center over fiber.At the least, install a short a segment of fiber in the path, just to reduce the chances of a direct hit coming to visit your data center (a very, very bad thing ... I've seen it).

Doing it this way will ensure that the power to the unit is good, and you keep the environmental hazards outside where they belong.

There are code and insurance issues as well that you may want to investigate.

It complicates the install somewhat, it boosts the upfront costs some, but in the long run, you'll save money and have have a more stable, reliable system.

FWIW

Scott

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