D-Link DGS-3620-52T CLI Guide - Page 864

xStack® DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch CLI Reference Guide Chapter 78 Power Saving Commands config power_saving {state [enable | disable] | length_detection [enable | disable]} show power_saving 78-1 config power_saving Description This command is used to configure the power saving for the system. By default, the power saving mode is enabled and the length detection mode is disabled. The power saving length detection function applies to the Gigabit ports with copper media. The power is saved by the following mechanisms. When the port has no link partner, the port automatically turns off and wakes up once a second to send a single link pulse. When the port is turned off, a simple receive energy-detect circuit is continuously monitoring energy on the cable. At the moment when energy is detected, the port turns on fully per IEEE specification requirements. The power saving function is performed while no link is detected and it will not affect the port capabilities while it is link up. When the port is link up, for shorter cable, the power consumption can be reduced by lowering the signal amplitude since the signal attenuation is proportional to the cable length. The port will adjust the power based on cable length and still maintain error free applications from both sides of the link. This mechanism will only be supported when the hardware supports the cable diagnostics function. Format config power_saving {state [enable | disable] | length_detection [enable | disable]} Parameters state - (Optional) Configure the power saving state to enable or disable. The default value is enable. enable - Enable the power saving feature. disable - Disable the power saving feature. length_detection - Configure the length detection state to enable or disable. The default value is disable. enable - Enable the length detection feature. disable - Disable the length detection feature. Restrictions Only Administrator and Operator-level users can issue this command. Example To configure power saving: 859