Proxim Tsunami QBII must use GPS synchronisation if more than one device located at the same place. Master radios must be on the same site.
Tsunami QuickBridge II radios operate using Time Division Duplexing (TDD), letting radios operate in a single RF channel shared between transmit and receive. If several QuickBridge II radio links must operate in close proximity (as would be the case if radios are co-located on a rooftop or on adjacent buildings), their transmitters must be time-synchronized to prevent interfering with receive signals of adjacent radios.
GPS synchronization minimizes interference between co-located QuickBridge II radios and allows radios to synchronized even if they are not physically connected. |
In general, QuickBridge II radios are considered co-located if you can see another radio from a potential installation location (within line-of-sight) or if there is another radio installed within 300 feet. (Exact rules are difficult to make due to local environmental variables.) Synchronization is accomplished using a satellite-derived 1 Hz timing signal from an external GPS receiver connected to each of the co-located QuickBridge II radios. Because far-end QuickBridge II radios are slaved to the co-located Master radios, the far-end radios do not require GPS receivers.
Note: The maximum cable length for attaching the GPS antenna is 7meters (approximately 23 feet).
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