Yealink SIP-T48S User Manual

User Guide for the SIP-T48S IP Phone
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The default value is 10, you can set to 1-30.
5. Click Confirm to accept the change.
Backlight
Backlight has three options:
Active Level: The intensity of the touch screen when the phone is active. You can change the
intensity of the touch screen. Digits (1-10) represent different intensities. 10 is the highest
intensity.
Inactive Level: The intensity of the touch screen when the phone is inactive. You can select a
low intensity or turn off the backlight.
Backlight Time: The delay time to change the intensity of the touch screen when the phone is
inactive. You can select a desired time to change the intensity or turn on the backlight
permanently.
 Always On: Backlight is on permanently.
 15s, 30s, 1min, 2min, 5min, 10min or 30min: Backlight is changed when the phone is
inactive after the designated time (in seconds).
You can also change the intensity of the LCD screen of EXP40 connected to the SIP-T48S IP
phone.
To configure the backlight via phone user interface:
1. Tap ->Basic->Display->Backlight.
2. Tap the gray box of the Active Level field, and then select the desired level from the
pull-down list.
3. Tap the gray box of the Inactive Level field, and then select the desired value from the

Yealink SIP-T48S Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Keypad illumination	Yes
Display diagonal	7 \
Display resolution	800 x 480 pixels
AC adapter input voltage	100 - 240 V
AC adapter output current	2 A
AC adapter output voltage	5 V
USB 2.0 ports quantity	1
Ethernet LAN (RJ-45) ports	2
Front camera	No
Voice codecs	CNG, G.711Mu, G.711a, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Lines quantity	16 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Dual-Tone Multi-Frequency (DTMF) modes	In-band, Out-of band, SIP info
Keypad number of keys	42
Security algorithms	AES
Networking standards	IEEE 802.3af
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	SIP v1, SIP v2, LLDP/CDP/DHCP, OpenVPN, IEEE802.1X, IPv6, HTTPS
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Cables included	LAN (RJ-45)
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	225 mm
Width	266 mm
Height	185 mm
Package depth	263 mm
Package width	324 mm
Package height	128 mm