Ipo/b5800 ip500 ext card phone 2

[junis]

Description to the card:
"The analog phone ports do not include a ringing capacitor. Where this
is a requirement, connection should be via a Master socket containing
ringing capacitors".

I didn't quite get what is meant by "Master socket".

Could you please help me?

[markgallagher]

Pretty much what is says. Analog phone sockets frequently contain capacitors as part of the connection for the ringing voltage signal.

In the UK (IP Office was originally designed in the UK), a sockets with those capacitors is called a master socket, a socket without is called a slave socket. Typically the first socket coming into the house or business premises had to be a master socket since that one received the ringing voltage from the external line.

Now with an IP Office connected to the external line, it is the IP Office that is providing ringing voltage to the extensions. In most cases the socket to which the IP Office analog phone port is connected needs to be include capacitors. However, some phones and ringer devices include their own capacitors and so can use a socket that has no capacitors.

[junis]

Fine, thank you!