Transmission apparatus for relaying different types of trunk sig

Details Transmission apparatus for relaying different types of trunk sig Transmission apparatus for relaying different types of trunk sig

1996-07-03

1999-02-23

Hong, Harry S.

Telephonic communications

Plural exchange network or interconnection

Interexchange signalling

34082563, 370212, 375238, 379237, 379240, 455403, 455554, H04M 700, G08C 1900, H04J 1500

Patent

active

058752447

ABSTRACT:
A transmission apparatus for relaying different types of trunk signals, including a central processing unit including a reception counter processor which is inserted between a pair of exchanges and enables direct relay of exchange trunk signals (Sxt) and analog trunk signals (Sem) of a pulse ear and mouth (E&M) mode on a radio transmission line by counting the pulse width of the signals (Sem) and determining their type, a transmission counter processor which transmits the pulse E&M signals until the count of the pulse width inherent to the signals Sem corresponding to the signals Sxt is finished, and a logical operation unit which generates the corresponding signals Sxt based on the result of determination of the reception counter processor and drives the transmission counter processor based on the input signals Sxt, whereby it is possible to give an existing digital transmission apparatus handling E&M signals a function corresponding to a conventional higher rank exchange.

REFERENCES:
patent: 3804991 (1974-04-01), Hammond
patent: 3859474 (1975-01-01), Gueldenpfennig
patent: 4002850 (1977-01-01), Richards
patent: 4636584 (1987-01-01), Binkerd
patent: 4776036 (1988-10-01), Hulsey et al.
patent: 5173933 (1992-12-01), Jabs et al.
patent: 5504802 (1996-04-01), Kennedy et al.
patent: 5666398 (1997-09-01), Schiffel et al.

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