H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/22, 379/57
H04J 3/12 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1242039
- 50 - Abstract Disclosed is a channel unit (109) for connecting a carrier channel multiplex or tie line directly to a terminating unit line such as that terminating a private branch exchange (102) or a telephone station set (117) thereby eleminating the normal local end office interconnection. In particular, the channel unit interfaces the different signaling protocols of the interconnected lines and generates call progress control signals such as dial tone and audible ringing which are normally generated by the local end office. The channel unit comprises a converter (205) for each line for converting the electrical interface signals representative of the busy and idle conditions of the line to logic levels also representative of the busy and idle conditions of the line. A predetermined series of these logic levels form a control signal that indicates the state of a call on the line. Since the control signal indicative of the state of the call on one line is typically not useable by the other line, a microprocessor (204) included in the unit generates a second control signal to advance the state of the call on the other line to an equivalent call state. An additional converter (205) then converts the logic levels of this second control signal to the electrical interface signals of the other line to advance the state of the call to the equivalent call state. The unit further comprises a receiver (201) and transmitter (202) for exchanging dial pulse and dual tone multifrequency address signals between the lines. Also, included are circuits (203, 226) for applying call progress control signals such as dial-tone, audible ringing, and power ringing to the lines (FIG. 2).
465360
Binkerd Mark S.
Sand William C.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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