Ubee DDW3611 User Manual
Also see for DDW3611: Configuration and troubleshooting guideSetup guideUser guide
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Ubee Interactive Deploying and Troubleshooting the Wireless NetworkUbee DDW3611 Wireless Cable Modem Gateway Subscriber User Guide • November 2012 676.4.1 Understanding Received Signal StrengthReceived signal strength (RSSI) is measured from connected wireless client devices tothe wireless cable modem. This value can significantly impact wirelessspeeds/performance. It is determined by: Materials (for example, open air, concrete, trees) Distance between wireless clients and the wireless cable modem Wireless capabilities of the client devicesTo determine the received signal strength, refer to Using the Access Control Option onpage 65 and review the RSSI value. A receive signal strength indicator between 0 and -64is considered optimal. Levels of -67dBm and lower (for example, -70, -80, etc.) have adownward impact on wireless data throughput.6.4.2 Estimating Wireless Cable Modem to Wireless Client DistancesThe information in this section helps you to determine how far a wireless cable modemcan be placed from wireless client devices. Environmental variances include thecapabilities of wireless clients and the types of material through which the wireless signalmust pass. When the wireless cable modem and wireless clients reach the distancethreshold between each other, network performance degrades.StepsTo determine wireless cable modem placement:1. Connect a wireless client to the wireless cable modem. Refer to Connecting Devices tothe Network on page 12 if needed.2. Place the wireless client at around one meter (three feet) away from the wireless cablemodem.3. Obtain the RSSI value for the connected client. Refer to Using the Access ControlOption on page 65. This value is used in the formula further below.4. Use the following table to determine what materials the wireless signal must travelthrough to reach the desired wireless coverage distance.Attenuation Considerations at 2.4GHzMaterial AttenuationConnector/Cable 3.5dBFree Space .24dB / footInterior Drywall 3dB to 4dBCubicle Wall 2dB to 5dBWood Door (Hollow/Solid) 3dB to 4dBBrick, Concrete Wall (Note 1) 6dB to 18db |
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