Intra link calling within a subscriber digital system

Details Intra link calling within a subscriber digital system Intra link calling within a subscriber digital system

1975-04-28

1977-05-03

Brown, Thomas W.

H04Q 360

Patent

active

040216187

ABSTRACT:
Disclosed is a feature for use in a subscriber digital multiplexer interfacing between a central telecommunications office (CO) and a plurality of remote terminals, each remote terminal serving a number of subscribers. Calls from and to lines at the same remote terminal are identified over a special network at the central office for the purpose of by-passing the speech channels to the central office and thereby freeing the central office equipment and two channels for use in processing other calls. The special network or intra link network is activated after the called station has responded to a call. First, a check is made to see whether a station at the same remote terminal has originated a call. A tone is then sent out over the line to determine whether the call originated and terminated at the same remote terminal. If both lines are from the same remote terminal, the call is transferred from the speech channels to intra link channels as controlled at the central office over signalling channels.

REFERENCES:
patent: 3311705 (1967-03-01), LeCorre et al.
patent: 3462557 (1969-08-01), Brooks et al.
patent: 3496301 (1970-02-01), Kaenel
patent: 3778555 (1973-12-01), Nordling et al.

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