United States Patent
Gurak et al.
Patent Number: Date of Patent:
 INTEGRATED I/O INTERFACE FOR COMMUNICATION TERMINAL
 Inventors: Richard J. Gurak, Summit; Robert Goeb, Spotswood, both of N.J.
 Assignee: ITT Corporation, New York, N.Y.
 Appl. No.: 312,508
 Filed: Feb. 17,1989
 Int. C1.5 H04L 9/00; H04M 11/06
 U.S. CI 380/49; 379/96;
 Field of Search 380/9, 49, 50, 59;
364/180, 200, 900; 379/96; 370/60, 67, 85.1, 85.9, 94.1, 125, 110.1-111
 References Cited
U.S. PATENT DOCUMENTS
4,180,860 12/1979 Driscoll et al 364/900
4,199,809 4/1980 Pasahow et al 364/200
4,425,664 1/1984 Sherman et al 364/200 X
4,554,658 11/1985 Marten et al 370/85.1
4,638,451 1/1987 Hester et al 364/900
4,750,111 6/1988 Crosby, Jr. et al 364/200
4,813,040 3/1989 Futato 370/111
FOREIGN PATENT DOCUMENTS
0222544 5/1987 European Pat. Off. 370/125
3717315 12/1988 Fed. Rep. of Germany 370/125
Primary Examiner—Stephen C. Buczinski
Assistant Examiner—Bernarr Earl Gregory
Attorney, Agent, or Firm—Arthur L. Plevy
An integrated I/O interface for a communication terminal, connectable with an external analog communication device and with an external digital communication device, includes an I/O interface subsystem having analog and digital arrays, a first connector for connecting the I/O interface subsystem to a digital processor for the terminal, and a second connector for connecting the I/O interface subsystem to both the analog communication device and the digital communication device. The digital array and the analog array including a CODEC are mounted on a platform carrier on the I/O interface subsystem board. The second connector is a single connector having pins for transmitting the analog signals, pins for the digital signals, a pin indicating whether the analog or digital mode is selected, and a pin indicating which external communication device is selected. The second connector also has common EMI and EMP protective filter circuits incorporated therein to protect the I/O interface subsystem.
15 Claims, 6 Drawing Sheets