Configuring The Root Bridge - Cisco BR1400 Deployment Manual

Note: To figure out how much attenuation you would need, simply add the transmitter power to
the antenna gain (in this case) 12 dBm + 22.5 dBm for 34.5 dBi then simply add the receiver
gain of the other Bridge antenna 22.5 dBi (assuming another integrated antenna) for a total of
57 dB (34.5 + 22.5) assuming the antennas are point at each other. To prevent receiver
overload (assuming free space loss at 5.8 GHz) you would need at least 2.9 meters or
separation for 57 dBm and ideally to operate error free you should have 76 dB of loss mapping
to 26 meters of separation.

6.8 Configuring the Root Bridge

• Mount the Bridge on the site and carefully align the bridge to the Non Root side
• Power up the Bridge and observe the Bridge LEDs
• Install LED of the Root Bridge remains black during boot - RSSI LEDs blink to indicate
POST (Power on Self Test).
• Install LED then blinks amber for 60 sec indicating that the Bridge is operating as a Non-
Root while it is scanning for a Root. If it does not find a Root to link with then Install LED
turns green and starts blinking green to indicate the Bridge has become Root, but not yet
associated to Non Root Bridge.
• If the Install LED turns solid Amber during installation of the Root, this could mean you
have interference or that your Bridge has located another Bridge operating as Root. If this
occurs, you will need to power down the interfering Bridge or pre-configure this link.
6.9 Configuring the Non-Root Bridge
• Mount the Bridge on the site and carefully align the bridge to the Root side
• Power up the Bridge and observe the Bridge LEDs
• Install LED of the Root Bridge remains black during boot - RSSI LEDs blink to indicate
POST
• Install LED then blinks amber for up to 60 sec indicating that the Bridge is operating as a
Non-Root while it scans for a Root. (Only for out-of-box procedure)
• Install LED turns solid amber to indicate root association.
• If the Install LED continues to blink amber then your alignment is not sufficient to continue.
You have 60 seconds to turn the Install LED solid amber by panning the antenna from
side-to side and up-to-down.
• Once the Install LED turns solid amber the RSSI LEDs will indicate the current signal
strength
• Align the antenna by panning the antenna from side-to-side and up-to-down while
observing the RSSI LEDs and/or by using a DC voltmeter connected to the RSSI "BNC"
connector. Set voltmeter to a low 5-15 Volt DC scale.
Assuming you have a valid radio link the Bridges will now pass traffic. After you are done installing
the Bridges and verified connectivity, don't forget to setup security, SSID and other parameters.
Copyright © 2004 Cisco Systems, Inc. All rights reserved.
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