EXTREME-CABLE-MIB

Description: Monitors cable diagnostics and time-domain reflectometry (TDR) results on Extreme Networks switch ports.

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EXTREME-CABLE-MIB is an Extreme Networks proprietary MIB providing cable diagnostics and time-domain reflectometry (TDR) test objects for copper Ethernet ports on Extreme switches. It exposes objects used to trigger and read back cable test results, such as cable length estimates, fault type (open, short, or normal), and the distance to a detected fault along each twisted pair. This is fundamentally a hardware-health monitoring MIB: it lets operators diagnose physical-layer cabling problems, distinguishing a bad cable/connector from a switch port hardware fault when a link is flapping or failing to come up. It is a self-contained Extreme Networks vendor extension for its switch hardware's built-in TDR capability rather than dependent on an external standard, though it complements IF-MIB link-state data. It is used by network technicians troubleshooting unreliable copper links on Extreme Networks switches, especially during cabling installation and fault isolation, and technicians can download the EXTREME-CABLE-MIB file to load it into their MIB browser.

A technician suspecting a bad patch cable on a flapping port would trigger a cable diagnostic test via this MIB's control objects and then read back the per-pair fault type and estimated fault distance to determine whether the cable has an open or short and roughly how far down the run it occurs. Comparing the reported cable length against the expected physical run length helps confirm whether a mis-terminated connector or a damaged cable segment is responsible. Since concrete sample object names were not available in the source excerpt, the exact table/object names are inferred from the MIB's stated purpose of Extreme-specific cable diagnostics.

Extreme Networks cable diagnostics MIB providing port-level diagnostic configuration and monitoring.