ZyXEL PLA-407 User Guide - Page 53
Link Information continued, Table 11
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Chapter 6 The OS X Configuration Utility Table 11 Link Information (continued) LABEL DESCRIPTION Avg. Source PB CRC Error Rate This field displays the average CRC (Cyclic Redundancy Check) error rate of transmission from the source device (as shown in the screen) received by destination Powerline device. Avg. Destination PB CRC Error Rate A Cyclic Redundancy Check (CRC) is used as a checksum to detect alteration of data during transmission. The CRC error check is performed after Forward Error Correction. If the error rate after FEC error correction is still high, then this indicates a lot of noise at all frequencies on this section of your Powerline network. Data transmission rates are reduced if there is a lot of noise on the line. A Cyclic Redundancy Check (CRC) is used as a checksum to detect alteration of data during transmission. This field displays the average CRC (Cyclic Redundancy Check) error rate of transmission from the destination Powerline device to the source device (as shown in the screen). Avg. Bits/Carrier The CRC error check is performed after Forward Error Correction. If the error rate after FEC error correction is still high, then this indicates a lot of noise at all frequencies on this section of your Powerline network. Data transmission rates are reduced if there is a lot of noise on the line. This field displays the average number of bits transferred over the connection measured in Mbps. This represents the physical rate of data transmission (the PHY rate) which includes not only the files sent on your Powerline, but also line overhead required to manage your network, such as error correction bits. The PHY rate is the clearest indicator of the quality of your line. Avg. SNR/Carrier • If the PHY rate is close to the HomePlug AV maximum data transfer rate, then the quality of this section of the line is very high, with very little attenuation. • If the PHY rate varies between the maximum level and a lower level (such as 60 Mbps), there is noise on this section of your Powerline. Attenuation is not a factor. • If the PHY rate is steady at a lower level (such as 80 Mbps), this is caused by attenuation and not noise on this section of your Powerline. This field displays the average Signal to Noise Ratio (SNR) measured in dB. Use this to check the amount of noise on this part of your Powerline network. The higher the number the better the connection quality. Noise on your Powerline network is usually caused by household appliances running on your Powerline network. The motor of a refrigerator can create electrical interference. A cell/mobile phone recharger which rapidly alternates between on and off can also generate noise. Poor cable quality and installation can also cause noise. To identify causes of noise on your network, disconnect an appliance connected on this part of your Powerline network and observe whether this reduces the Signalto-Noise ratio. PLA-407 User's Guide 53