Panasonic ZEQUO 6400, Operating Instructions Manual

Page: 760 / 1058

66. Power Saving Commands
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66.Power Saving Commands
The commands are used to configure the power saving mode.
If a port is not link up, the mode periodically repeats turning ON/OFF
the power feed to the port to save more power consumption than
when the power feed is always ON.
It also detects the length of a cable connected to the port and adjusts
the power according to the length.
66.1. 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]}
config power_saving {state [enable | disable] | length_detection [enable | disable]}
show power_saving