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If your Konftel 250 is not working properly:
• Check that the microphone is turned on during the call. The blue microphone LEDs
must be lit.
• If the display shows “ANALOG OVERCURRENT”, the Konftel 250 is connected to a
digital telephone jack. Switch to an analogue phone jack.
• Bypass any extension cables and check that the Konftel 250 is working properly.
• If the Konftel 250 needs to wait for a second dialling tone, you should enter a pause
using the pause/mute button when entering a telephone number as an instruction or
in the phonebook.
You can find more FAQ on the Konftel website, www.konftel.com/250.
TroUblesHooTinG
Size
Diameter 240 mm, height 77 mm
Weight
1 kg
Colour
Charcoal black
Display screen
Illuminated graphics (LCD), 128x64
Keypad
Alphanumerical 0–9, *, off hook/F, on hook, mute, hold,
volume up, volume down, 5 buttons for menu navigation,
phone book, conference guide
Anti-theft protection
Kensington security slot
Memory
Support for SD memory cards up to 2 GB
connectivity
Analogue telephone connectivity
Modular 6/6 modular (RJ11) to a public analogue telecom-
munication network or an analogue PBX
Power supply
AC adapter 100–240 V AC/14 V DC
Expansion microphones 2 modular 4/4
audio
Technology
OmniSound
®
2.0
Microphone
Omni-directional
Reception area
Up to 30 metres
2
, >10 people
Speakers
Frequency band 200–3300 Hz
Sound level
90 dB SPL 0.5 m
Equalizer
Three pitches: soft, neutral, bright
environment
Temperature
5°–40°C
Relative humidity
20-80% condensation free
Recommended acoustic conditions
Reverberation period: 0.5 S Rt 60
Background noise: 45 dBA
approvals
Telecommunication
TBR21, 47 CFR Part 68/TIA, IC CS-03 Issue 1999/01/01
EMC
EN301 489-1,3. EN 300 220-1,2, FCC subparts B and C
Electrical safety
UL 60950-1, EN 60950-1:2001
TecHnical sPecificaTions
