selective ringing वाक्य
उदाहरण वाक्य
मोबाइल
- Some non-Bell Company system party lines in the US used multiple frequencies for selective ringing.
- Another selective ringing system was based on using different ringing frequencies for each station on the party line.
- In North America, this was used mostly by independent telephone systems, while the Bell System abandoned frequency selective ringing in the early 1900s.
- Key telephone systems also supported manual buzzers, intercom lines ( with or without selective ringing ), music on hold, and other features.
- All fully selective ringing systems on party lines still brought the inconvenience of finding the line in use occasionally, by hearing talking, when one picked up the phone to make a call.
- The two subscribers on a two-party line would have separate three-letter then four digit numbers in a special number group, and had selective ringing to the party required only ( code ringing with a letter suffix for the code required was not used ).
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