公开(公告)号：CA1110705A

公开(公告)日：1981-10-13

申请号：CA320461

申请日：1979-01-30

Applicant: MOTOROLA INC

Inventor： DOLIKIAN ARMAN V ,  FREEBURG THOMAS A

IPC: H04B1/04 ,  H04B1/54 ,  H04B7/26 ,  H04B7/24

Abstract: IMPROVED RADIO TRANSMITTER TIME OUT TIMER A mobile data terminal system is capable of voice or microprocessor controlled data transmission over a keyed transmitter. The improved timer apparatus disables further transmission if the transmission duration or the average duty cycle, over a period of repeated transmitter keying exceed predetermined limits. Where the disable mode resulted from a microprocessor fault, the tansmitter continues to be disabled until the microprocessor is reset.

公开(公告)号：DE69733223T2

公开(公告)日：2006-01-19

申请号：DE69733223

申请日：1997-03-11

Applicant: MOTOROLA INC

Inventor： DELLAVERSON LOUIS P ,  JACKSON JR III ,  FREEBURG THOMAS A

IPC: H04L12/28 ,  H04L12/56 ,  H04L29/06 ,  H04L29/12 ,  H04Q11/04

Abstract: A target device (18) performs the steps of receiving a broadcast message via an out-of-band paging network (14) which message includes an identification of the sourcing device. The subscriber (18) automatically registers, responsive to the receipt of the broadcast message, with a local communication server (22) associated with an in-band communications network (12). The target subscriber (18) then uses the identification of the sourcing device (16) to respond to the communication from the sourcing device (16) to establish a communication path therewith through the local communication server (22). In a preferred embodiment, the target subscriber unit and method reside in an asynchronous transfer mode (ATM) network. In this manner, the present invention establishes a direct communication path between the local communications server (22) to which the target subscriber unit (18) is attached and the sourcing device (16) thereby minimizing network trafficking and inefficiency problems.

公开(公告)号：CA2190300C

公开(公告)日：2001-12-04

申请号：CA2190300

申请日：1991-03-01

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A

IPC: H04W36/14 ,  H04B7/185 ,  H04W84/06 ,  H04Q7/20

Abstract: There is provided a method of networking a satellite network and a terrestri al network. Information is communicated with a subscriber over the terrestrial network. A first portion of the information is communicated between a communications device of the terrestrial network and a first orbiting satellite of the satellite network over a first communication path. The information is handed-off such that a second portion of the information is communicated between the communications device and a second orbiting satellite of the satellite network over a second communication path .

公开(公告)号：IN184873B

公开(公告)日：2000-09-30

申请号：IN401DE1993

申请日：1993-04-21

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A

IPC: H04L5/22

公开(公告)号：BR9306647A

公开(公告)日：1998-12-08

申请号：BR9306647

申请日：1993-06-21

Applicant: MOTOROLA INC

Inventor： EASTMOND BRUCE C ,  RACHID ALAMEH ,  FREEBURG THOMAS A

IPC: H04B10/114 ,  H04B10/10

公开(公告)号：ES2119781T3

公开(公告)日：1998-10-16

申请号：ES91920269

申请日：1991-03-01

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A

IPC: H04B7/204 ,  H04B7/185 ,  H04Q7/38 ,  H04B7/19

Abstract: There is provided a mechanism for networking satellite and terrestrial networks. It comprises: maintaining subscriber-received power levels of terrestrial network transmissions about one order of magnitude above co-channel satellite transmissions to overcome interference and maintaining subscriber transmissions to terrestrial networks at power levels about one order of magnitude of the below co-channel transmissions to satellite networks to avoid causing interference at the satellite. Such power level maintenance is provided by the network in communication with such subscriber. Moreover, a non-orbiting ("grounded") satellite cooperates as a switching node of both the satellite network and a terrestrial network to relay information between a terrestrial subscriber and the satellite radiotelephone network over a terrestrial network. The terrestrial network and the satellite network may communicate via either the inter-satellite spectrum or the terrestrial-to-satellite spectrum.

公开(公告)号：AU683730B2

公开(公告)日：1997-11-20

申请号：AU1837995

申请日：1995-02-06

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A ,  JACKSON IRVIN RILEY ,  LEY JOHN

IPC: H03D3/06 ,  H03D3/22 ,  H04B1/10

公开(公告)号：DK0400983T3

公开(公告)日：1997-10-06

申请号：DK90305868

申请日：1990-05-30

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A

IPC: H04L1/00 ,  H04L1/02 ,  H04L1/20

Abstract: There is provided a scheme for bit error rate detection. It is characterised by: detecting the bit value present in a received multi-level signal (102), more narrowly detecting the bit value present in that received multi-level signal (104), comparing the results of narrow detection with the results detected otherwise to identify errors in detection (203, 206, 207 and 209), and accumulating detected symbol errors over unit time. Bit error rate detection can be used for antenna selection-selecting one of a plurality of diversity antennas when the error rate exceeds (213) a certain error threshold.

公开(公告)号：DE69031247D1

公开(公告)日：1997-09-18

申请号：DE69031247

申请日：1990-05-30

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A

IPC: H04L1/00 ,  H04L1/02 ,  H04L1/20

Abstract: There is provided a scheme for bit error rate detection. It is characterised by: detecting the bit value present in a received multi-level signal (102), more narrowly detecting the bit value present in that received multi-level signal (104), comparing the results of narrow detection with the results detected otherwise to identify errors in detection (203, 206, 207 and 209), and accumulating detected symbol errors over unit time. Bit error rate detection can be used for antenna selection-selecting one of a plurality of diversity antennas when the error rate exceeds (213) a certain error threshold.

公开(公告)号：FI97516B

公开(公告)日：1996-09-13

申请号：FI891275

申请日：1989-03-17

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A ,  DAUTEL DONALD F

IPC: H04W76/04 ,  H04W88/02 ,  H04W88/16 ,  H04W92/02 ,  H04Q7/22 ,  H04M11/06

Abstract: A unique cellular data telephone system includes a cellular telephone system (CTS 150), a cellular data switch (CDS 170), and a telephone central office (130) for providing both voice and data telephone services to portable and mobile cellular data telephones (CDTs 102, 122) located anywhere in a large geographical area. Each of the CDTs (102, 122) includes a data control unit (DCU 106), a cellular modem (162) and a cellular telephone (108) and associated antenna (110), and connects to a data terminal (104, 124) with keyboard and display. DCU (106) includes memory (302) for storing a CDS telephone number and CDT telephone number, microcomputer (304) with internal memory for controlling data communications between cellular modem (162) and data terminal (104), a duel tone multifrequency ("DTMF") encode (306) for encoding telephone numbers and control signals, a DTMF decoder (314) for decoding DTMF telephone digits and/or DTMF control tones, a buffer (312) for storing transmit data from data terminal (104), and analog switches (308, 310) for coupling DTMF encoder (306) and buffer (312) to the transmit data Td signal to cellular modem (162). If data transmit (104) is inactive for a predetermined time interval, DCU (106) automatically disconnects the cellular telephone call while maintaining the landline telephone call to a data host (140, 141). Once data is transmitted again by data terminal (104), DCU (106) automatically places another cellular telephone call and is reconnected to the landline telephone call.