Yealink SIP-T48U Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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Custom Screensaver Picture Limit
Either the smaller or the larger picture will be scaled proportionally to fit the screen. The screensaver picture format
must meet the following:
Phone Model Format Resolution
Single File
Size
Note
EXP50/EXP43
*.jpg/*.png/*.bmp/*.jpeg
<=4.2 mega-
pixels
<=5MB
2MB of space should be reserved
for the phone
T57W/T54W/T48U/T48S/T48G
<=2.0 mega-
pixels
<=5MB
T46U/T46S/T46G/T29G
<=1.8 mega-
pixels
<=5MB
Screensaver Configuration
The following table lists the parameters you can use to configure screensaver.
Parameter
screensaver.wait_time <y0000000000xx>.cfg
Description
It configures the time (in seconds) to wait in the idle state before the screen saver starts.
Permitted
Values
15-15s
30-30s
60-1min
120-2min
300-5min
600-10min
1800-30min
3600-1h
7200-2h
10800-3h
21600-6h
Default
21600
Web UI
Settings > Preference > Screensaver Wait Time
Phone UI
Color Screen Phones:
Menu > Basic > Display > Screensaver > Wait Time
Black-and-white Screen Phones:
Menu > Settings > Basic Settings > Display > Screensaver > Wait Time(s)
Parameter
screensaver.display_clock.enable <y0000000000xx>.cfg
Description
It enables or disables the phone to display the clock and icons when the screen saver starts.
Note: It works only if “screensaver.type” is set to 0 (System) or 1 (Custom).
Permitted
Values
0-Disabled
1-Enabled

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