Lane J Abrams

50181840, May 21, 1991

Jul 3, 1990

7/548464

Lane J. Abrams - Highland Park NJ
Kevin Loughran - Randolph NJ
David W. Masukewicz - Randolph NJ
Robert L. Overstreet - Morristown NJ

AT&T Bell Laboratories - Murray Hill NJ

H04M 124
H04J 314

379 29

Disclosed is a circuit for the automatic testing of channel units such as found in subscriber loop carrier (SLC. RTM. ) systems. The circuit is included as part of the remote terminal of the system and performs type tests, power-up tests and routine verification tests. The circuit also monitors the subscriber channel, and connects the subscriber in the event of a ringing signal or an off-hook during a test. The results of the test are sent to a display unit which can be located at the remote terminal and/or the central office.

54795826, Dec 26, 1995

Nov 6, 1992

7/973585

Lane J. Abrams - Highland Park NJ
Inars Gruntals - Mendham NJ
Hoo-Yin Khoe - Parsippany NJ
Kevin Loughran - Township of Randolph, Morris County NJ

AT&T Corp. - Murray Hill NJ

G06F 1300

395821

Disclosed is a message oriented interface for communication between a bank controller unit and peripheral devices, such as channel units, in digital loop transmission systems. At least four registers are used for each peripheral device. Two registers are utilized to transmit control signals, and two registers are for data transmission. An additional data register can hold the last byte read by the bank controller unit in the event of an error so the byte can be re-read. The last byte of each message, which is utilized for error detection, is the exclusive OR function of the corresponding bits in all the previous bytes of the message. A service request can be asserted by a peripheral device to the Bank Controller Unit when a control signal is present in one of the registers. Means are also provided for indicating when a register is busy.