telephone line voltage

The telephone line voltage in the UK is nominally 48 volts.  The telephone line voltage in other countries differs so if you've purchased "grey" goods there is a distinct possibility that damage may be caused if these are connected to the public network.

There is a polarity on telephone line voltage so that some devices won't work if they've been wired up incorrectly.  These are now much rarer than they were back in the 1980s when the telecoms industry was deregulated.

Where PABX and key-system products are concerned the extension telephone line voltage will have been decided on by the manufacturer's designers for optimal working.

For the Samsung DCS, iDCS and OfficeServ ranges the DLI ports telephone line voltage is standard across the world.  However the SLI telephone line voltage will vary according to the country the module was manufactured for.

At TelephoneSystemsDirect we can assist you with queries on telephone line voltage.  Just call us on 0800 652 8052 where your technical query will be dealt with promptly.