Yealink SIP-T48U Administrator's Guide

Phone Customization
209
Black-and-white Screen Phones:
Menu > Settings > Basic Settings > Display > Backlight > Active Level
Parameter
phone_setting.inactive_backlight_level <y0000000000xx>.cfg
Description
It configures the intensity of the LCD screen when the phone is inactive.
Note: If expansion module EXP20 or EXP40 is connected, the backlight on the expansion module
automatically changes to match this setting.
Permitted
Values
0-Off, it works only if “phone_setting.backlight_time” is not set to 1 (Always On).
1-Low
Default
1
Supported
Devices
All color screen phones
Web UI
Settings > Preference > Inactive Level
Phone UI
Menu > Basic > Display > Backlight > Inactive Level
Parameter
phone_setting.backlight_time <y0000000000xx>.cfg
Description
It configures the delay time (in seconds) to change the intensity of the LCD screen when the phone is
inactive.
Permitted
Values
0-Always On
1-Always Off (not applicable to color screen phones)
15-15s
30-30s
60-1min
120-2min
300-5min
600-10min
1800-30min
Default
T57W/T54W/T53W/T53/T48U/T48S/T48G/T46U/T46S/T46G/T43U/T29G: 0
T42G/T42S/T42U/T41P/T41S/T40P/T40G/T27G/T23P/T23G/T21(P) E2/CP920: 30
Supported
Devices
All phones except T19(P) E2
Web UI
Settings > Preference > Backlight Time(seconds)
Phone UI
Color Screen Phones:
Menu > Basic > Display > Backlight > Backlight Time
Black-and-white Screen Phones:
Menu > Settings > Basic Settings > Display > Backlight > Backlight Time
Label Length for Line Key Display
By default, the line key label only displays the first few characters when the length of the label exceeds the max-
imum length. You can specify the line key label length as needed. It is only applicable to color screen phones.
When label length feature is set to Default:

Yealink SIP-T48U Specifications

General

Handset type	Wired handset
Product type	IP Phone
Product color	Gray
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Expansion module support	Yes
Ethernet LAN (RJ-45) ports	2
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Voice codecs	AGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Security algorithms	AES, HTTPS, SRTP, TLS
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Front camera	-
AC adapter input voltage	100 - 240 V
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Keypad number of keys	29
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Width	226 mm
Height	185 mm