aNetwork port

bDirect PC connection via network cable

cHeadset socket

dReceiver socket

eConnection for optional USB devices

fUSB port for a COMfortel D-Wireless dongle (EZC-5200BS).

gRubber cover: to connect a COMfortel D-XT20 key extension module, remove the cover and attach it to the extension module.

hPower supply via COMfortel ® D-XT-PS

iUSB port, exclusively for connecting a COMfortel D-XT20 key extension module.

aSocket into which you plug the COMfortel D-XT-PS wall-mounted power supply (if you connect two or more key extension modules).

bUSB port (e.g. for connecting another COMfortel D-XT20 key extension module).

cMicro-USB port: use this to connect the telephone to the key extension module.