Yealink SIP-T52S Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
204
dark environments. Backlight time specifies the delay time to change the intensity of the LCD
screen when the IP phone is inactive. Backlight turns off quickly if a short backlight time is
configured, this may not give users enough time to read messages. Backlight time is applicable
to SIP-
T54S/T52S/T48G/T48S/T46G/T46S/T42G/T42S/T41P/T41S/T40P/T40G/T29G/T27P/T27G/T23P/T
23G/T21(P) E2/CP860/CP920 IP phones, EXP40 (connected to SIP-T48G/T48S/T46G/T46S IP
phones) and EXP20 (connected to SIP-T29G/T27P/T27G IP phones).
You can configure the backlight time as one of the following types:
 Always Off: Backlight is turned off permanently (not applicable to SIP-
T54S/T52S/T48G/T48S/T46G/T46S/T29G IP phones).
 Always On: Backlight is turned on permanently.
 15s, 30s, 1min, 2min, 5min, 10min or 30min: Backlight is turned off when the IP
phone is inactive after a preset period of time (in seconds), but it is automatically
turned on if the status of the IP phone changes or any key is pressed.
Active Backlight Level is used to adjust the backlight intensity of the LCD screen when the
phone is active. Unused BackLight is used to adjust the backlight intensity of the LCD screen
when the phone is inactive. Active Backlight Level is applicable to SIP-T54S/T52S IP phones and
the connected EXP50, SIP-T48G/T48S/T46G/T46S IP phones and the connected EXP40, SIP-
T29G/T27P/T27G IP phones and the connected EXP20. Unused BackLight is only applicable to
SIP-T54S/T52S IP phones, SIP-T48G/T48S/T46G/T46S IP phones and the connected EXP40, SIP-
T29G IP phones and the connected EXP20.
Note
The following table lists available methods and configuration options to configure the backlight
of phone models/expansion modules.
Phone Model (and
the connected
expansion module)
Configuration
Methods
Configuration Options
T54S/T52S(EXP50)
T48G/S(EXP40)
T46G/S(EXP40)
T29G(EXP20)
Configuration Files
Web User Interface
Phone User
Interface
Unused BackLight/Inactive
Level (not applicable to
EXP50)
Active Backlight Level/Active
Level
Backlight Time (not
applicable to EXP50)
T27P/G(EXP20)
Configuration Files
Web User Interface
Active Backlight Level/Active
Level
It is not applicable to SIP-T19(P) E2 IP phones.
Before you adjust the LCD’s backlight of expansion module, make sure the expansion module
has been connected to the IP phone.

Yealink SIP-T52S Specifications

General

Touchscreen	-
Display diagonal	2.8 \
Backlight display	Yes
Display resolution	320 x 240 pixels
Lines quantity	16 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	12
AC adapter input voltage	100 - 240 V
Bluetooth version	2.1+EDR
Security algorithms	802.1x RADIUS, HTTPS, MD5
Ethernet LAN interface type	Gigabit Ethernet
USB 2.0 ports quantity	1
Ethernet LAN (RJ-45) ports	2
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Voice codecs	G.722, G.723, G.723.1, G.726, OPUS, iLBC
Volume control	Digital
Operating temperature (T-T)	-10 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Cables included	LAN (RJ-45)
Number of handles included	1 pc(s)
Front camera	No
Operating system installed	Linux

Weight and Dimensions

Depth	212 mm
Width	211.6 mm
Height	166.8 mm