Numeris ISDN socket: Allows for direct connection with a modem (Internet access). Quarter-turn self-stripping terminals for quick connection. Can be tapped in. 2 modules. 8 contacts, 2.5 mm² earth terminal. 8-contact telephone socket: 2 modules. Accepts test module (RC) ref. 512 48 Female USB socket: Able to connect USB devices (printer, scanner, external hard drive). Connection using screw terminals, 1 mm² section. 1 module. Max. cable length: 5 m. Female IEEE 1394 socket: FireWire or i.link socket, specially designed for the transfer of a large volume of digital photo or video data. Connection using screw terminals, 1 mm² section. 1 module. Max. cable length: 5 m.