ZyXEL SBG3300-NB00 User Guide - Page 323
xDSL Statistics, SBG3300-N Series User's Guide
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Chapter 28 xDSL Statistics Table 113 System Monitor > xDSL Statistics (continued) LABEL DESCRIPTION Downstream These are the statistics for the traffic direction coming into the port from the service provider. Upstream These are the statistics for the traffic direction going out from the port to the service provider. FEC This is the number of Far End Corrected blocks. CRC This is the number of Cyclic Redundancy Checks. ES This is the number of Errored Seconds meaning the number of seconds containing at least one errored block or at least one defect. SES This is the number of Severely Errored Seconds meaning the number of seconds containing 30% or more errored blocks or at least one defect. This is a subset of ES. UAS This is the number of UnAvailable Seconds. LOS This is the number of Loss Of Signal seconds. LOF This is the number of Loss Of Frame seconds. LOM This is the number of Loss of Margin seconds. SBG3300-N Series User's Guide 323