H - Electricity – 04 – J
Patent
H - Electricity
04
J
354/105
H04J 3/00 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1289252
ISDN INTERFACE TRUNK CIRCUIT ABSTRACT OF THE INVENTION This circuit is a trunk type interface circuit which interfaces between duplicate copies of an ISDN system and T-carrier facilities. The circuit is controlled by a digital signal processor which has a 16-bit wide data bus. The digital signal processor is capable of supporting various Zero Byte Time Slot Interchange (ZBTSI) techniques. Also included is an administrative microprocessor which collects data concerning the operation of the trunk circuit and transmits this information to the ISDN system. The administrative microprocessor also receives information from currently unused data bits in the input bit stream from the ISDN system. The trunk circuit includes one receiver which collects and stores data transmitted by the ISDN system. Another receiver collects and stores data transmitted via the T-carrier facilities. The trunk circuit also includes two transmitters. One transmitter converts previously formatted data to T-carrier compatible data and transmits the data via the T-carrier facilities. The other transmitter converts reformatted data received from the T-carrier facility to data compatible with the ISDN format and transmits this data to the ISDN system. The memory of this circuit includes a dual port random access memory which provides for nearly simultaneous access by two separate input/output controllers.
565365
Blewitt William D.
Kruis Peter
Young John S.
Gte Communication Systems Corporation
R. William Wray & Associates
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