Cisco AIR-BR1410A-A-K9 - Aironet 1410 Wireless Bridge Deployment Manual page 39

positive and negative charges becomes too great, the electrical charge jumps from one area to

another, creating a lightning bolt. Most lightning bolts will strike from one cloud to another, but

they can also strike the ground or other metal objects. Static electricity from wind, snow or the

electrical energy from a lightning strike or nearby strike can cause damage your Bridge or other

electronic equipment

Always use a grounding block on the BR-1400 and make sure the grounding block is attached

to a suitable ground.

Tip: Always use the grounding blocks supplied with the 1400 series bridge and take it to

a suitable ground

The grounding block is installed inline with 75 ohm coax cables at the building entrance

providing lightning protection. It has straight through F-connectors where the shield is

connected to the body of the block.

Grounding Block will bleed off any charge that builds up on outer conductor.

Power Injector and the outdoor unit have integrated lightning impulse protection at the coax

interface which will provide surge protection on the center conductors of all the F-type

connectors.

Use a heavy gauge wire and keep ground wire as short as possible. The use of a good ground

will lessen the chance of damage due to a nearby strike and helps to "bleed off" any static

charges that may build up on the cable.

Note:

There is no known or guaranteed protection from a direct lightning strike.

Tip: Always keep the ground wire as short as possible and attach to a suitable ground.

Suitable grounds may include (but are not limited to):

1. Ground rod buried into the earth

2. Electrical Panel ground.

3. Building structural steel such as "I" beams

4. Professional grounding systems that may already be installed (see figure 7).

5. Metal air conditioner units (attached to the building) provided they are grounded.

6. Metal radio tower (assuming the tower is grounded), Note: Some towers especially AM

radio towers are not grounded as the tower is actually isolated from ground as it is being

used as the antenna. This is known as a "hot" tower and you must isolate the bridge and all

grounds from this type of tower.

7. Telephone or cable TV ground.

8. If an older building is used and no plastic PVC is used, sometimes a cold water pipe

(usually copper) can be used.

Copyright © 2004 Cisco Systems, Inc. All rights reserved.

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