ECS4110-28T_Management Guide

C HAPTER 27 | Interface Commands
Power Savings
– 1019 –
COMMAND MODE
Privileged Exec
COMMAND USAGE
◆ The results include common cable failures, as well as the status and
approximate distance to a fault, or the approximate cable length if no
fault is found.
◆ To ensure more accurate measurement of the length to a fault, first
disable power-saving mode on the link partner before running cable
diagnostics.
◆ For link-down ports, the reported distance to a fault is accurate to
within +/- 2 meters. For link-up ports, the accuracy is +/- 10 meters.
EXAMPLE
Console#show cable-diagnostics interface ethernet 1/23
Port Type Link Status Pair A (meters) Pair B (meters) Last Updated
-------- ---- ----------- ---------------- ---------------- -----------------
Eth 1/23 GE Up OK (21) OK (21) 2009-11-13 09:44:19
Console#
Power Savings
power-save This command enables power savings mode on the specified port.
SYNTAX
[no] power-save
COMMAND MODE
Interface Configuration (Ethernet, Ports 1-24/48)
COMMAND USAGE
◆ IEEE 802.3 defines the Ethernet standard and subsequent power
requirements based on cable connections operating at 100 meters.
Enabling power saving mode can reduce power used for cable lengths
of 60 meters or less, with more significant reduction for cables of 20
meters or less, and continue to ensure signal integrity.
◆ Power saving mode only applies to the Gigabit Ethernet ports using
copper media.
◆ Power savings can be enabled on Gigabit Ethernet RJ-45 ports.
◆ The power-saving methods provided by this switch include:
■
Power saving when there is no link partner:
Under normal operation, the switch continuously auto-negotiates to
find a link partner, keeping the MAC interface powered up even if no
link connection exists. When using power-savings mode, the switch