Cisco 8821 Guide

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
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There are many factors that can influence actual battery life time.
Usage
Battery life will be reduced when the Cisco Wireless IP Phone 8821 or 8821-EX user is on call, using Bluetooth, using
applications, receiving XSI messages, or navigating the menus on the phone.
Coverage
Ensure the Cisco Wireless IP Phone 8821 and 8821-EX remain in a good RF coverage area and is able to maintain a constant
connection to the Cisco Unified Communications Manager.
If the Cisco Wireless IP Phone 8821 or 8821-EX user travels out of range and remains out of range for a significant duration,
battery life can be reduced.
Scan Mode
The Cisco Wireless IP Phone 8821 and 8821-EX supports 3 different scan modes (Continuous, Auto, Single AP), where
Continuous is the default configuration.
The configured scan mode will determine the battery life baseline.
• Continuous scan mode is designed for Cisco Wireless IP Phone 8821 and 8821-EX users that are constantly on the
move where frequent roaming events occur and to maximize performance and connectivity, but power consumption is
higher.
• Auto scan mode is designed for Cisco Wireless IP Phone 8821 and 8821-EX users that roam occasionally and require
more idle battery life than Continuous scan mode can offer.
• Single AP scan mode is designed for Cisco Wireless IP Phone 8821 and 8821-EX users that do not roam and require
maximum idle battery life.
Proxy ARP
For optimal idle battery life, it is recommended to utilize an access point that supports the Cisco Compatible Extensions (CCX)
Proxy ARP feature. CCX Proxy ARP allows the Cisco Wireless IP Phone 8821 and 8821-EX to remain in suspend mode
longer versus having to wake up at each DTIM period, therefore reducing power consumption.
The Cisco Lightweight Access Points and Cisco Autonomous Access Points support CCX Proxy ARP, but Cisco Meraki
Access Points do not.
For Cisco Lightweight Access Points, CCX Proxy ARP is enabled by default and non-configurable. For Cisco Autonomous
Access Points, CCX Proxy ARP is disabled by default, but can be enabled via the dot11 arp-cache optional command.
If the access point does not support CCX Proxy ARP, then the Cisco Wireless IP Phone 8821 and 8821-EX must wake up at
each DTIM period, which can reduce idle battery life as much as 50%.
Transmit Power
Call State
Scan Mode
Expected
Battery Time
On Call
Continuous
Up to 13 hours
Auto
Up to 13 hours
Idle
Continuous
Up to 48 hours
Auto
Up to 96 hours

Cisco 8821 Specifications

General

Wi-Fi	Yes
Ethernet LAN	No
Wi-Fi standards	802.11a, Wi-Fi 5 (802.11ac), 802.11b, 802.11g, Wi-Fi 4 (802.11n)
Bluetooth version	3.0+HS
Security algorithms	EAP-FAST, EAP-TLS, PEAP, WPA
Networking standards	IEEE 802.11a, IEEE 802.11ac, IEEE 802.11b, IEEE 802.11d, IEEE 802.11e, IEEE 802.11g, IEEE 802.11n, IEEE 802.11r
USB 2.0 ports quantity	1
Voice codecs	G.711, G.711a, G.722, G.729, G.729ab, iLBC
Volume control	Digital
Product type	IP mobile phone
Product color	Black
Input frequency	50 - 60 Hz
AC adapter input voltage	100 - 240 V
AC adapter output current	0.2 A
Display diagonal	2.4 \
Display resolution	240 x 320 pixels
Frequency band	2.412, 2.472, 5.180, 5.240, 5.260, 5.320, 5.500, 5.700, 5.745, 5.825 GHz
Lines quantity	- lines
Phonebook capacity	- entries
Storage temperature (T-T)	-30 - 60 °C
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Safety	UL 60950-1, CAN/CSA 60950-1, EN 60950-1, IEC 60950-1, AS/NZS 60950.1, IEC 60529 (IP 67)
Certification	● 47 CFR 15 B ● ICES-003 B ● EN 55022 B ● AS/NZS CISPR 22 B ● CISPR 22 B ● VCCI B ● EN 61000-3-2 ● EN 61000-3-3 ● KN 22 B ● EN 55024 ● EN 50082-1 ● EN 61000-6-1 ● EN61000-6-3 ● EN 300386 ● EN 60601-1-2 ● KN
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	17 mm
Width	56 mm
Height	132 mm
Weight	126 g