User's Manual

ARCXTEND 5.8 GHZ USER MANUAL – R1.0, ISSUE 1

PureBurst Ingress Noise Suppression

PureBurst effectively functions as a door. When there is no wireless upstream signal being

received by the Hub, this door is closed. When closed, the Hub does not output any noise onto

the cable plant. Therefore, when other subscribers are transmitting in the upstream to the

CMTS, the wireless hub does not contribute to the cable plant’s noise floor.

When a cable modem utilizing the wireless upstream link is transmitting the door is open. During

this time the Hub allows the upstream signal plus Hub related thermal noise to pass onto the

cable plant. Closing of the door results in the cable plant’s U/S noise floor returning to its

previous level. This ensures that the only upstream signal affected by the hub’s internal

upstream noise is the wireless burst signal as scheduled by the CMTS. This allows many

wireless hubs employing PureBurst to be connected to the same cable plant without raising the

upstream plant noise floor and affecting other users sharing the same cable plant.

This feature is enabled by default.