Cisco DPC2434 Installation And Operation Manual page 29

WebWizard Gscan Function
When installing a Cisco wireless home gateway, you can speed up the process by
using the WebWizard Gscan function. To access the WebWizard Gscan function, you
must first connect a PC to the cable modem. Then, using your Web Browser, you can
access the WebWizard Gscan function.
Note: For more information on the WebWizard Gscan function, see WebWizard (on
page 60).
Obtain Upstream Parameters
After finding a valid downstream data channel, the wireless home gateway reviews
the upstream parameters needed to perform the next stage: ranging and automatic
adjustments. The upstream parameters enable the wireless home gateway to send
data to the CMTS. When the wireless home gateway finds the correct upstream
parameters, the wireless home gateway proceeds to the ranging and automatic
adjustments stage.
If the wireless home gateway cannot find valid upstream parameters, it returns to
the scan for downstream channel stage. Then the wireless home gateway starts to
scan again at the next available channel.
Adjust Timing Offset and Power Level
After the wireless home gateway obtains its upstream parameters, it begins the
ranging and automatic adjustments stage. In this stage, the wireless home gateway
adjusts the timing offset and the power level for communicating with the CMTS.
The wireless home gateway uses MAC messages to determine the upstream channel
frequency and adjusts timing offsets to verify the synchronized timing between the
CMTS and the wireless home gateway. This process also determines the upstream
signal transmit power level from the wireless home gateway to communicate with
the CMTS.
After the wireless home gateway completes the ranging stage and registers with the
CMTS, it repeats this routine regularly to fine-tune the settings established in the
previous stages. These regular adjustments are considered routine maintenance and
do not affect normal operations of your wireless home gateway service.
Note: If the wireless home gateway fails to achieve the proper settings when
performing ranging and automatic adjustments, it terminates the session and restarts
the initialization process at the scan for downstream channel stage.
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Theory of Operation
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