公开(公告)号：CA2087507A1

公开(公告)日：1993-10-01

申请号：CA2087507

申请日：1993-01-18

Applicant: IBM

Inventor： BRIGIDA DAVID J ,  MOORE VICTOR S ,  PATE THOMAS K

IPC: G06F13/00 ,  H04L27/00 ,  H04L29/06 ,  H04L29/08 ,  H04M11/06 ,  H04B17/02

Abstract: A method and system are disclosed for permitting selected command sequences to be processed by a modem during data transfer operations. A preselected escape character is designated and inserted into a data stream to be applied to a modem in order to identify a selected command sequence which follows. A termination character is inserted into the data stream following the selected command sequence. Upon detection of the preselected escape character, the selected command sequence is coupled to a command processor within the modem and processed. In applications in which the modem is coupled between a data processing system and a cellular telephone communication channel, the selected command sequence may be utilized to transmit communication channel parameter status queries to a cellular telephone associated with the modem. In this manner, the Received Signal Strength Indicator (RSSI), bit error rate, or other indications of communication channel status may be queried. An identical technique may be utilized to transmit a response to each such query to the data processing system, permitting real time display of cellular communication channel status information during data transfer.

公开(公告)号：CA2090712A1

公开(公告)日：1993-10-07

申请号：CA2090712

申请日：1993-02-23

Applicant: IBM

Inventor： CAMILLERI PATRICK F ,  DONALDSON ROBERT L ,  GRAY MICHAEL N ,  BRIGIDA DAVID J ,  BROWN MARVIN K ,  FADO FRANCIS ,  MOORE VICTOR S ,  PATE THOMAS K ,  TOUT JAMES J JR

IPC: G06F3/041 ,  B65G61/00 ,  G06F1/16 ,  G06F3/033 ,  G06F3/048 ,  G06K7/10 ,  G06K17/00 ,  G06Q10/08 ,  G07B17/00 ,  G06K9/62

Abstract: A combination of an intelligent touch sensitive tablet display and a stylus which is manually operable to enter a signature on the tablet display, the combination having a means to detect input from manual contact with the tablet display, characterized in that a means is provided for disabling input from manual contact with the tablet display when the stylus is within a predetermined distance to the tablet display.

公开(公告)号：CA2086854A1

公开(公告)日：1993-10-01

申请号：CA2086854

申请日：1993-01-07

Applicant: IBM

Inventor： BRIGIDA DAVID J ,  MOORE VICTOR S ,  ROBINSON JAMES E

IPC: H04Q7/38 ,  H04L29/06 ,  H04L29/08 ,  H04M11/06 ,  H04Q7/34 ,  H04B7/005 ,  H04Q7/22

Abstract: A method and system are disclosed for automatically selecting an optimum modem protocol in a distributed data processing system which includes a modem which supports multiple protocols which is coupled to a cellular communications system. Known cellular communications systems generate a Received Signal Strength Indicator (RSSI) and a Service Access Tone (SAT) which may be utilized by a cellular telephone to determine the amplitude of a received signal and to optimize a path through the cellular communication system for voice communications. The Service Access Tone (SAT) is generally utilized to control the "hand off" of a communication session to a new cell and provides an indication of the quality of the existing path through the cellular communication system. After initiating communication between a first modem and a second modem, the method and system of the present invention automatically determines the channel quality within the cellular communication system by utilizing the Received Signal Strength Indicator (RSSI) and the Service Access Tone (SAT). These signals are analyzed, in conjunction with the bit error rate of the dotting sequence transmitted by the answering modem, to achieve an indication of the quality of the cellular communications channel. In response to an analysis of these factors a particular protocol may be selected which is optimum for existing channel conditions.

公开(公告)号：BR9301307A

公开(公告)日：1993-10-05

申请号：BR9301307

申请日：1993-03-25

Applicant: IBM

Inventor： BRIGIDA DAVID J ,  MOORE VICTOR S ,  PATE THOMAS K ,  JENNES ROBERT V ,  MAGUIRE SANDRA A ,  MADISON NORMAN L

IPC: H01L29/00 ,  H01Q1/24

公开(公告)号：BR9301123A

公开(公告)日：1993-10-05

申请号：BR9301123

申请日：1993-03-10

Applicant: IBM

Inventor： BRIGIDA DAVID J ,  MOORE VICTOR S ,  ROBINSON JAMES E

IPC: H04Q7/38 ,  H04L29/06 ,  H04L29/08 ,  H04M11/06 ,  H04Q7/34 ,  G06F13/00

Abstract: A method and system are disclosed for automatically selecting an optimum modem protocol in a distributed data processing system which includes a modem which supports multiple protocols which is coupled to a cellular communications system. Known cellular communications systems generate a Received Signal Strength Indicator (RSSI) and a Service Access Tone (SAT) which may be utilized by a cellular telephone to determine the amplitude of a received signal and to optimize a path through the cellular communication system for voice communications. The Service Access Tone (SAT) is generally utilized to control the "hand off" of a communication session to a new cell and provides an indication of the quality of the existing path through the cellular communication system. After initiating communication between a first modem and a second modem, the method and system of the present invention automatically determines the channel quality within the cellular communication system by utilizing the Received Signal Strength Indicator (RSSI) and the Service Access Tone (SAT). These signals are analyzed, in conjunction with the bit error rate of the dotting sequence transmitted by the answering modem, to achieve an indication of the quality of the cellular communications channel. In response to an analysis of these factors a particular protocol may be selected which is optimum for existing channel conditions.