Power Requirements; Power Save And Power Save Plus; Power Save; Power Save Plus - Cisco 7821 User Manual

Power Requirements

Power Requirements
The following Cisco-approved power adaptors must be used with the Cisco IP Phones 7821, 7841, and 7861:
• Phihong Adaptor (PSC18U-480); Rating: 48 VDC 0.38A
• Delta Adaptor (EADP-18VB B); Rating: 48 VDC 0.375A

Power Save and Power Save Plus

There are two levels of energy-saving modes that your system administrator can set up:
• Power Save: The phone display goes blank when not in use for a period of time, reducing the power
• Power Save Plus: The phone display goes blank, turning the phone off and on at predetermined times.

Power Save

Depending on how your system administrator set up your phone, the phone display may go into a power-save
mode (the phone screen appears blank).
To turn on the phone display, press any button, touch the blank phone screen, or pick up the handset.

Power Save Plus

Your phone supports the Cisco EnergyWise (EW) program, also known as Power Save Plus. Your system
administrator sets up sleep (power down) and wake (power up) times for your phone to save energy. If your
phone goes into the Power Save Plus mode, the Select button is lit white.
Ten minutes before the scheduled sleep time, the Select button lights up and you receive a message that your
phone will power off at a specific time. If enabled by your system administrator, you also hear your ringtone
play. The ringtone plays according to the following schedule:
• At 10 minutes before power off, the ringtone plays four times
• At 7 minutes before power off, the ringtone plays four times
• At 4 minutes before power off, the ringtone plays four times
• At 30 seconds before power off, the ring tone plays 15 times or until the phone powers off
If your phone is inactive (idle) at the sleep time, you see a message to remind you that your phone is about
to power down. To keep the phone active, you need to press OK in the message or any key on the phone. If
you do not press the button or any key, your phone powers down.
If your phone is active (for example, on a call), your phone waits until it has been inactive for a period of time
before telling you of the pending power shutdown. Before the shutdown happens, you see a message to remind
you that your phone is about to power off.
Cisco IP Phone 7821, 7841, and 7861 User Guide for Cisco Unified Communications Manager 10.0 (SIP)
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requirements.
The power to the phone is significantly reduced.
Getting Started