| 摘要 |
A network repeater having a plurality of repeater ports selectively establishes links with remote nodes at one of two data rates based on the capabilities of the remote network node, configuration information supplied by user in circuitry, and a determined link integrity. A network repeater establishes a link with a network node using auto-negotiation techniques to establish a 100 Mb/s link. The network repeater than monitors the link for symbol errors, and determines an integrity of the link based on a detected number of symbol errors relative to a prescribed threshold in a dual-counter configuration. If the detected number of symbol errors counted by the first counter within a first number of received symbols, the second counter is incremented and the first counter reset. If over a second, longer interval the second counter reaches a second threshold reaches the prescribed threshold, indicating poor link integrity due to poor cable connection or condition, faulty network device, etc., causing repeated symbol errors over a greater distribution of received symbols the network repeater performs a down shifting operation by breaking the established 100 Mb/s link, and restarting auto-negotiation to establish a 10 Mb/s link. Hence, the network repeater may monitor high-speed links for link integrity, and selectively downshift a link encountering a substantial number of errors to a reduced data rate, without a necessity of monitoring and control by a network manager or other remote management agent. Rather, an interrupt is output from the network repeater to the user circuitry in response to a determined poor link integrity or downshifting operation, enabling the user circuitry to then determine the status of the network repeater.
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