Cisco 2950G 24 Software Configuration Guide - Page 566

LRE Statistics Chapter 28 Troubleshooting Table 28-2 LRE Link Statistics Statistic Type Upstream Bandwidth Usage Downstream Bandwidth Usage Signal to Noise Ratio Upstream Reed-Solomon Errors Downstream Reed-Solomon Errors Explanation The percentage of the bandwidth used for upstream traffic, based on the current upstream rate and actual upstream speed of LRE link. The percentage of the bandwidth used for downstream traffic, based on the current downstream rate and actual downstream speed of the LRE link. The amount of increased received signal noise (in decibels) relative to the ambient, environment, and electromagnetic noise power level that the switch is designed to tolerate without disconnecting from the remote LRE CPE device. The higher the ratio, the more resilient the link. The number of detected and corrected data errors being received on the switch LRE port. Reed-Solomon errors result from noise exceeding the noise margin. For short bursts of noise (such as motor startup or power surges), the Reed-Solomon error correction prevents the loss of Ethernet data frames. The LRE interface corrects the data bytes that are incorrectly received on the switch LRE port (up to a designed 8-byte limit). The residual error rate is better than the detection capability of the Ethernet cyclic redundancy check (CRC). If the error burst is larger than the correction capability of the LRE interface, the Ethernet CRC is used to determine the corrupted frames and to discard them. The number of detected and corrected data errors being received on the CPE RJ-11 wall port. Table 28-3 CPE Ethernet Link Statistics Counter Transmit Bytes Unicast Frames Multicast Frames Broadcast Frames Dropped Frames Pause Frames Collision Frames One Collision Frames Multiple Collisions Description Total number of bytes transmitted out of this port. The total number of well-formed unicast frames sent by a port. It excludes frames sent with errors or with multicast or broadcast destination addresses. The total number of well-formed multicast frames sent by a port. It excludes frames sent with errors or with unicast or broadcast destination addresses. The total number of well-formed broadcast frames sent by a port. It excludes frames sent with errors or with unicast or multicast destination addresses. The count of frames that were dropped before transmission. Incremented for each MAC pause control frame transmitted. The total number of frames sent without error after having 1 to 15 collisions. It includes frames of all destination address types and excludes frames discarded because of insufficient resources or late collisions. Incremented for each frame that experienced exactly one collision during its transmission attempt. Incremented for each frame that experienced more than one collision during its transmission attempt. 28-4 Catalyst 2950 Desktop Switch Software Configuration Guide 78-14982-01