WO1994027412A1 - Procede et ordinateur pourvu de moyens de communication a distance par l'intermediaire d'un reseau telephonique utilisant un mode fil ou un mode radio - Google Patents

Procede et ordinateur pourvu de moyens de communication a distance par l'intermediaire d'un reseau telephonique utilisant un mode fil ou un mode radio Download PDF

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Publication number
WO1994027412A1
WO1994027412A1 PCT/IB1994/000109 IB9400109W WO9427412A1 WO 1994027412 A1 WO1994027412 A1 WO 1994027412A1 IB 9400109 W IB9400109 W IB 9400109W WO 9427412 A1 WO9427412 A1 WO 9427412A1
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WO
WIPO (PCT)
Prior art keywords
modem
command
commands
computer
control circuit
Prior art date
Application number
PCT/IB1994/000109
Other languages
English (en)
Inventor
Olivier Mardinian
Larry Taylor
Dave Heeschen
Original Assignee
Apple Computer, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Apple Computer, Inc. filed Critical Apple Computer, Inc.
Priority to AU66865/94A priority Critical patent/AU6686594A/en
Priority to EP94914523A priority patent/EP0699370A1/fr
Publication of WO1994027412A1 publication Critical patent/WO1994027412A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Definitions

  • the present invention relates in general to computers that are fitted with means for remote communication via a telephone network, and in particular to portable personal computers.
  • such a computer is fitted with a modem enabling it to modulate digital data onto signals that are suitable for being conveyed over a telephone network and to demodulate digital data from such signals.
  • the modem is connected to the telephone network by a cord.
  • the present invention relates to a computer capable of remote communication via the public telephone network equally well by means of a cord connected to the network and by means of a radio link, e.g. in compliance with the above-specified standard.
  • WO-A-91 07044 discloses software protocols that are used to handle cellular specific carrier loss and calling delays, as well as the packetised transfer of data, with transmission retries for corrupted packets.
  • a host modem in a computer with a radio system in order to obtain a transparent operation from the user's standpoint.
  • US-A-5 127 041 describes a set of customized cables for attaching a computer to a cellular or other phone system.
  • An object of the present invention is to propose such a computer in which a call can be established in either of those two modes without the software in the computer which is making use of such calls needing any special adaptation.
  • the invention seeks to handle modes of access to the network in a manner that is transparent for the computer user.
  • the invention provides a computer, in particular a portable personal computer, suitable for remote communication via a telephone network, characterized in that it comprises in combination: a computer unit including a central processor, storage means, input/output means, and means for inputting and displaying data; a modem connected to the computer unit and suitable for being connected to the telephone network via a cord; a transmitter/receiver circuit suitable for establishing calls by radio with a remote site, likewise for accessing the telephone network; a control circuit for the transmitter/receiver circuit; means provided in the computer for applying commands to the modem as selected from a predefined set of commands; cord call determining means provided in the computer for determining whether a telephone call via the cord is desired or in progress, and for producing a corresponding signal; means provided in the computer either for processing commands received in the modem or else for converting said received commands into specific commands for the control circuit and for applying these specific commands to the control circuit as a function of said signal; and means provided in said control circuit for processing said specific commands.
  • said transmitter/receiver circuit is suitable for accessing said telephone network by previously establishing a radio link with a base station;
  • the cord call determining means are provided in the modem;
  • the cord call determining means comprise detection means for detecting connection of the cord to the modem;
  • said detection means are constituted by means for determining the presence of a country identifier in said cord;
  • each of said specific commands comprises: a common prefix; information representative of the fact that said command is a specific command; and a command identifier; said common prefix is identical to a common prefix for commands belonging to said predefined command set;
  • the control circuit is originally designed for receiving manual instructions from a user producing instruction signals, one of said specific commands includes a command identifier followed by a string of characters, said identifier being representative of manual instruction simulation, and the control circuit is suitable for processing said characters of said string as though they constitute instruction signals resulting from giving manual instructions; said manual instructions are constituted by keypresses performed on a key
  • the invention provides a method for use in a computer, in particular a portable personal computer, comprising: a computer unit including a central processor, storage means, input/output means, and means for inputting and displaying data; a modem connected to the computer unit and capable of being connected to a telephone network via a cord; a transmitter/receiver circuit suitable for establishing radio calls with a remote site; a control circuit for controlling the transmitter/receiver circuit; and means provided in the computer for applying commands to the modem, which commands are selected from a predefined set of commands, the method being intended to set up a remote call via said telephone network and being characterized by the following steps: it is determined whether a telephone call via the cord is requested or is in progress, and a corresponding signal is produced; as a function of said signal, either received commands are processed in the modem, or else the received commands are converted into specific commands for the control circuit and said specific commands are applied to the control circuit; and said specific commands are processed in said control circuit.
  • Figure 1 is a block diagram of a computer of the invention
  • Figure 2 shows a detail of the Figure 1 computer
  • Figure 3 shows another detail of the Figure 1 computer
  • FIG 4 shows two operating modes of a component of the computer.
  • a portable personal computer 10 comprising the components that are conventional for such a computer, namely: a central processor unit, a read-only memory, a read/write memory, input/output circuits, mass storage devices, a data input device such as a keyboard, and data display means such as a liquid crystal display screen, for example.
  • a central processor unit a central processing unit
  • a read-only memory a read/write memory
  • input/output circuits mass storage devices
  • mass storage devices namely: a data input device such as a keyboard, and data display means such as a liquid crystal display screen, for example.
  • data input device such as a keyboard
  • data display means such as a liquid crystal display screen
  • the computer may be a "PowerBook” (registered trademark) model as manufactured by Apple Computer Inc.
  • the computer 10 also includes a modem card 12 connected to the portion 11 by a suitable connector.
  • the modem card may be the "PowerBook Express Modem” also manufactured by Apple Computer Inc. It constitutes an intelligent modem card controlled by a microcontroller and by a resident program.
  • the modem card 12 may be connected to the Public Telephone network (PTN) by a cord 12a.
  • PTN Public Telephone network
  • the modem card is also equipped to read an electrical parameter from the connector of the cord representative of the identifier of a country for which the cord is adapted, and to adapt its own operating parameters as a function of the telephone regulations applicable to that country. Further details concerning that device can be obtained by referring to Documents FR-A-2 652 173 and FR-A-2 677 831 in the name of the Applicant.
  • this country identification process is also used to determine whether a telephone call via the cord is possible or is in progress.
  • the radio call controller 13 designates a radio call controller and 14 an associated transmitter/receiver circuit under its control. In the present example, these elements are made in compliance with the standard ESTI 300-131, commonly referred to as CT2 for "Cordless Telephone 2".
  • the radio call controller 13 is governed by a microcontroller and by a resident program.
  • the controller 13 is connected to the modem 12 by a serial link, as described in detail below.
  • all of the call commands and in particular commands taken from a standardized set commonly known as the "AT" commands, are applied to the modem 12 independently of the communications mode used, as described in detail below.
  • the modem 12 performs the modulation and demodulation processes and it handles high level protocols such as the following standard protocols: T30, MNP, and V42.
  • the controller 13 performs low level functions, in particular line access and line handling.
  • the modem 12 is capable of controlling the controller 13 by means of a pre-established set of specific commands.
  • the resident program in the modem 12 is designed initially to verify whether the cord 12a is connected to the modem 12. If it is, then the commands of the above-specified standard set ("AT" commands) are processed normally by the modem. If it is not connected, then the program in the modem is designed to convert the commands it receives from the computer into corresponding commands for the circuits 13 and 14, which commands belong to the above-specified specific set.
  • AT the commands of the above-specified standard set
  • the program in the modem is designed to convert the commands it receives from the computer into corresponding commands for the circuits 13 and 14, which commands belong to the above-specified specific set.
  • selection of the link mode to be used i.e. by wire or by radio, may be performed at the initiative of the user, but in principle, the presence of the cord is always verified.
  • controller circuit 13 is derived directly from a circuit designed for fitting to a portable radio telephone, i.e. if it is designed to process instructions that come essentially from pressing specific keys on a keypad, then it is preferable to provide a specific command for emulating such a keypress or keypresses. More particularly, the resident program in the controller 13 is designed to interpret such a command exactly as if a user of a portable radio telephone had pressed a key on the keypad corresponding to a keypress identifier that follows the command.
  • This interface is preferably a conventional serial interface such as the "SCI" interface (Serial Communication Interface), operating in asynchronous mode. That interface has two lines LI and L2, respectively for transmitting and receiving analog audio signals, a line L3 acting as an auxiliary input/output line, and an on/off control line L4.
  • the logic of the modem 12 and the logic of the controller circuit 13 are designed so that when the modem seeks to send a command to the controller, it merely applies the corresponding data to the line LI, and the controller 13 processes or ignores the command depending on whether or not it is ready. In other words, when the controller 13 is not actually processing commands, it listens permanently to the line LI so as to process any new commands that may appear thereon. Otherwise it merely ignores a command.
  • each command sent by the modem 12 to the controller 13 is terminated by an end character such as carriage return ( ⁇ CR> ), which is necessary to cause the command to be executed.
  • the resident programs in the modem and in the controller circuit are designed so that the modem program can send a status or state request command to the controller program, as described in detail below, after which it waits for a reply in the form of a message in a predetermined format including a string of characters that is representative of the state of the control circuit and of the transmitter/receiver. This string of characters is terminated by ⁇ CR>.
  • the signals interchanged between the modem 12 and the controller 13 are as follows: a) logic signals:
  • Txo data output from modem
  • Rxi data input to modem
  • auxiliary I/O used for general purpose input/output
  • PowerOn a pulse signal for "waking up” the controller circuit and the transmitter/receiver circuit (switch on);
  • Ring_Txa_Sel a control signal for an analog switch that selectively applies to the analog input terminal of the modem either a ring digital signal or an analog signal.
  • transmission over the serial link is asynchronous, no clock signal is conveyed.
  • the clock frequencies of the modem microcontroller and of the controller circuit microcontroller are merely set to values that are appropriate for clocking signals suitably.
  • the selected data format comprises a start bit at a low logic level, eight data bits, and a stop bit at a high logic level.
  • the 8-bit data is transmitted beginning with the least significant bit.
  • Txal, Txa2 positive and negative terminals for analog data output from the modem in the form of differential signals; and Rxal, Rxa2: positive and negative terminals for analog data input to the modem in the form of differential signals.
  • commands are used taken from a set having the following format:
  • AT command ⁇ CR> AT is a prefix, indicating that this is a command, and it is identical to the prefix of a standard set of predefined commands for a conventional modem connected to the telephone network by a cord;
  • ⁇ CR> is the required "carriage return" character.
  • the command proper may be of greater or shorter length.
  • a most important command in the set of commands from the modem 12 to the controller 13 is a keypad emulation command.
  • This command may have the following format:
  • AT"KPklk2...kn ⁇ CR> kl to kn designate ASCII format characters corresponding to the keys of a CT2 standard radiotelephone keypad.
  • F $46 (Flap, i.e. an overall on/off command corresponding to the flap of a foldable radiotelephone being opened or closed).
  • the values given above are in hexadecimal format.
  • a hang-up command for disconnecting an established link may have the following format:
  • the controller circuit 13 On receiving this command, the controller circuit 13 causes a "FULL_RELEASE” instruction to be sent to the central station, said instruction being taken from the CAI standard. This should cause the link to be disconnected immediately by the base. However, under certain conditions, the base station may desire to prolong the link. To see whether this situation has arisen, the modem may, as described in detail below, send a status request following the hang-up command, and it may be programmed to respond (e.g. by sending a message to the user) as a function of the status it actually receives.
  • a power-off command may also be used to disconnect the link.
  • a command for starting access to the link may be used to establish a radio link.
  • the circuit 13, 14 attempts to establish a link in default mode (public mode or private mode) and in a default "slot" (for more details about these concepts, reference should be made to the above- mentioned CT2 standard - in particular, the term "slot" is used herein to designate a particular location in a table of parameters). That said, it is explained below that the user of the computer has the option of programming a particular slot and/or mode and of conserving such parameters in memory.
  • This command is sent by the modem 12 to the control circuit 13 when transmission is to be performed in radio mode and the modem receives a standard off- hook command from the computer.
  • it is the microcontroller that generates the appropriate AT " type command as a function of the standard AT command received. Provision may be made for establishing two types of link, namely one type for data in voice band, and another type for voice communication. In the first case, the mute function in the control circuit 13 is disallowed, whereas in the second case, it is allowed. For example, 5 seconds after sending such a command to the circuit 13, the modem may send a status request to find out whether a link has, in fact, been established. It may be observed at this point that the modem can determine the identifier of the active slot used from the status information provided by the circuit 13.
  • the command for establishing a voice band data link may be as follows:
  • the command for establishing a direct voice link may be as follows, for example:
  • the circuits 13 and 14 can no longer accept incoming calls, nor can they ask for a link to be established.
  • the modem waits for a predetermined time-out, e.g. 3 seconds, before switching off the power to the circuits 13 and 14.
  • a predetermined time-out e.g. 3 seconds
  • This power-off command is particularly appropriate for a portable computer that is battery powered, since it enables battery power to be saved whenever there is no request for a radiotelephone call.
  • the format of power-off command may be as follows:
  • a power-on command is also provided for the circuits 13 and 14. This command enables power to be applied to said circuits, and it also serves to "warm start” or reinitialize the circuits 13 and 14.
  • the circuit 13 When the circuit 13 receives a power-on command, it reinitializes itself, and in particular it loses its current configuration. It is the configuration previously saved by the user in the EEPROM of the circuit 13 which is automatically recalled.
  • the format of this command may be as follows:
  • This characteristic is particularly useful when two or more "associations" are open in the modem 12 of a computer of the model mentioned above.
  • the modem is programmed so as to send a save settings command to the circuit 13 instead of a power-off command AT"P0 ⁇ CR>, since it is necessary to avoid interrupting the radio link which may still be in use by other associations.
  • the format of the command may be the following: AT"P2 ⁇ CR>
  • a command may be provided for switching the gircuits 13 and 14 to private mode.
  • the circuit 13 switches to private mode and uses the default private slot as the active slot. As described below, it is possible to change slot by sending a slot selection command.
  • a slot identifier (LID) is used to designate the active slot for a link that makes contact with the private base station.
  • the circuits 13 and 14 will remain in private mode until a switch to public mode command (see above) is received.
  • the format of the private mode command may be as follows:
  • AT"M1 ⁇ CR> for example, is provided for switching the circuits 13 and 14 to public mode. This is done in substantially the same manner to that described above for switching to private mode, except that it now 10 switches to public mode. Similarly, the circuits 13 and 14 remain in public mode until they next receive a private mode command AT " M0 ⁇ CR>.
  • circuits 13 and 14 to register with a private base. To do this, the circuits 13 and 14 must have a private slot available. It is the modem that determines whether such a slot is available.
  • the circuit 13 Once the circuit 13 has received such a command, 20 it returns a link identifier value in the range $0401 to $FFF3 to the modem if the slot is presently occupied, and equal to $FFFF if the slot is available. When there is no available private slot, then it is up to the user to make one available, otherwise , 25 registration will not be possible.
  • the format of this private registration may be the following:
  • the modem sends another command to the circuit 13, e.g. of the format: 35 AT"KP# ⁇ CR>
  • the format of this command may be as follows:
  • AT"KPS4M ⁇ CR> When registering with a "Telepoint" server, the modem 12 must transmit certain blocks of data to the server via the circuits 13 and 14. These blocks may be transmitted by means of a command having the following format: AT"KPxx...x ⁇ CR> where xx...x are the data block.
  • the program resident in the circuit 13 increments a block number to be received each time a block has been received correctly.
  • An OK message may be sent via the modem 12 to the application in operation in the computer once all of the blocks have been transmitted correctly, or else an error message is sent if a problem has occurred.
  • the same process takes place except insofar as the data blocks are delivered to the circuit 13 via the modem by using a special command, e.g. AT ⁇ Bxx...x ⁇ CR>.
  • a special command e.g. AT ⁇ Bxx...x ⁇ CR>.
  • the modem knows that it must wait for an acknowledgment from the circuit 13, which in this case merely indicates the number of the next block to be processed.
  • the application may request the modem to transmit a command AT " KP# ⁇ CR>. This cancels the process from the start.
  • This is a registration process that takes place during radio transmission and which is performed after a link has been established between the computer and the public telephone network.
  • This simplified registration has the advantage of reducing the quantity of data to be interchanged.
  • a suitable user interface must be provided for entering the data required for registration, with said data being transmitted, as before, by commands of the AT'Bxx...x ⁇ CR> type.
  • An application is advantageously designed to enable the user to select between normal public Registration and simplified registration.
  • a localization command may be provided for enabling the computer to receive calls. This can be done in public mode only. Before sending this command to the circuit 13, a link must have been established between the computer and a public base.
  • the format of this command may be as follows:
  • a problem specific to this command is the presence of a voice message coming from the base.
  • a particularly advantageous solution consists in detecting electrical energy to determine the instant at which such a message comes to an end. The modem can then send a command to the circuit 13 such as:
  • AT"KPxx ⁇ CR> after the end of the voice message where xx specifies the duration of localization, in ASCII format and in predetermined time units. This duration is preferably determined once and for all.
  • a delocalization command may also be provided to prevent calls being received. This command can be performed in public mode only. A link with a public base must previously have been established.
  • the delocalization command may be as follows: AT " L0 ⁇ CR>
  • a slot selection command is provided for selecting a particular slot in public or private mode.
  • the computer may have eight private slots and four public slots available to it.
  • This command may be as follows:
  • n designates the number of the slot and lies in the range 1 to 8 for private mode and 1 to 4 for public mode.
  • a command may also be provided for retrieving the electronic serial number (ESN) from the module 13,
  • this command may be:
  • the modem After sending this command, the modem puts itself in receive mode and waits to receive the ESN number in asynchronous mode via the serial interface.
  • a number can be dialled only after the computer has waited for a link to be established. A keypress emulation command is then applied to the circuit 13. When dialing in public mode, the string of digits must be terminated with a "#".
  • Dialing thus takes place as follows: AT"KPabcdef... ⁇ CR> in private mode; or AT"KPabcdef...# ⁇ CR> in public mode; where abcdef... designates the number to be dialed. Mention is made above on several occasions of the circuit 13 supplying status information to the modem, in particular for the purpose of providing information on how various processes that have been started are proceeding.
  • status is sent only after a status request, i.e. by sending a command AT"S ⁇ CR> and waiting for a reply.
  • this information occupies two general status bytes. Specific information may follow these two bytes.
  • Bits 2 and 1 (registration status) 00: bad block
  • circuits 13, 14 may be locked out (operation not allowed) or unlocked.
  • Commands of the type AT"KP... ⁇ CR> are used to switch the circuits from one state to the other.
  • Bits 3-0 (slot number) A digit in hexadecimal format.
  • Registration block number Four digits in ASCII format (four bytes). Registration block number
  • the status thus comprises a total of seven bytes and in the present case its format is as follows:
  • Extended status This second status format may be used, in particular, for enabling the computer to emulate a portable telephone having a keypad and a display.
  • This extended status is transmitted to the modem 12 by the circuit 13 after it has received an extended status request command which may be as follows: AT"S1 ⁇ CR>.
  • Keypress simulations are sent to the controller circuit 13 by above-mentioned commands AT"KP... ⁇ CR> .
  • Extended status information is used to obtain from the circuit 13 the data required for making the computer screen emulate the display conventionally provided by a portable radiotelephone (mainly in the form of text and icons) .
  • circuits 13 and 14 are of the type used in a portable radiotelephone of the type capable of displaying eight different symbols or icons, namely: a "busy” indicator; a "public” indicator; a “private” indicator; a “on” indicator; a “shift” indicator; a “locked” indicator; a “scroll” indicator; a “ringing” indicator.
  • Each of the above symbols can take up three states: off, on, or blinking.
  • the states of the eight symbols as determined by the circuit 13 can therefore be encoded on two bytes.
  • the controller circuit 13 controls a larger number of symbols, one or more additional bytes may be provided.
  • these 12 characters may be added on after the two bytes of symbols as defined above.
  • the hardware of the analog signal interface between the modem 12 and the controller circuit 13 comprises two analog transmit signal channels and two analog receive signal channels. This thus constitutes a 4-wire interface.
  • the modem When the modem operates with direct connection to the public telephone network by cord, it is in 2-wire mode. Ringing information arrives on what corresponds to analog signal reception in 4-wire mode.
  • the controller circuit 13 is designed to emulate a ringing signal, written ERING, by applying modulation to a special conductor.
  • a logic inverter is provided for selectively applying said emulated signal to the analog receive input of the modem.
  • the corresponding circuit is shown diagrammatically in Figure 3.
  • the analog inverter 100 has a control input on which it receives a ringing/analog transmission select signal written Ring_Txa_Sel.
  • the input terminal A of the inverter 100 is connected to the above-mentioned special conductor.
  • the input terminal B of said inverter is connected to the output of a 2-input differential amplifier 110 which has the positive and negative analog receive signals RXA1 and RXA2 respectively applied thereto.
  • the output from the inverter 100 is applied to the analog receive input RXA of the modem.
  • the resident program in the modem is not altered to accommodate the circuits 13 and 14.
  • Figure 4 shows the hardware of the interface in 4- wire mode and in 2-wire mode.
  • Reference 12b at the bottom of Figure 4 designates the telephone line interface.
  • PowerBop is a CT2 modem, based on the Apple PowerBoo Express modem and the Motorola Silverlink CT2 telephon handset. This modem can take place in PowerBooks 160,165c 180,180c.
  • the Silverlink controller board will control th Silverlink tranceiver board.
  • the mode is responsible of doing the modulation-demodulation proces and all the high level protocols (like the T30 protocol, MNP and V42 data protocols).
  • the CT2 controller i responsible of the link access and link management.
  • CT2 radio interface In order to have the modem control the CT2 radio interface we have defined a set of commands and status.
  • the hardware interface between the modem and the CT2 device is based on a Motorola SCI, working in Asynchronous mode only, with 1 extra wire which can be used for general purpose Input/Output.
  • the logic interface is shown in Figure 2 .
  • the baud rate used by the SCI on the modem side is 9.765
  • the asynchronous data format is 1 stop bit, 1 start bit and
  • VIH 2.72 V to 3.2V
  • VIL 0 V to 0.85V
  • Txal Analog Data Out from the Modem - positive differential signal
  • Txa2 Analog Data Out from the Modem-negative differential signal
  • Rxal Analog Data In for the Modem - positive differential signal
  • Rxa2 Analog Data In for the Modem- negative differential signal
  • this command set is based on a pseudo AT command set . Following the AT character sequence , a special character is added indicating that the command is a PowerBop low level AT command.
  • the command part of the AT sequence is limited to 10 characters due to the limited buffer on the CT2 device.
  • the "KP" command is the only command which may need to exceed that limit (because of long dial strings). In this case, the modem will need to break the keypresses into 2 "Kp" commands and send them separately over the serial interface.
  • the CT2 device will concatenate these keypresses and handle them as one series of keypresses.
  • the "Key Press” Command is the Basic command which allows the modem to operate the CT2 controller board like an operator would use the keyboard of the Silverlink. This kind of command is especially used to dial the number.
  • the ID of this command is KP , and it is followed by the ASCII codes of the keys to be pressed.
  • the Hangup command is used to break a link already established. It corresponds to going On hook for a Modem on the PSTN (Public Switched Telephone Network) .
  • PSTN Public Switched Telephone Network
  • the CT2 device On reception of that command the CT2 device will transmit a CAI FULL_RELEASE to the base station. Normally this will cause immediate termination of the link by the base, but under certain circumstances the base may wish to extend the link. To determine that situation the modem will check the status and will react appropriately.
  • the Initiate Link Access command is used to try to establish a radio link. It will be attempted on the default mode and slot (either Public or Private), unless the user has selected an alternate slot or mode since power up. It corresponds to going Off hook for a Modem on the PSTN (Public Switched Telephone Network).
  • PSTN Public Switched Telephone Network
  • the attempt to get a link will last 5s, after that the modem will know if the link access was successful by reading the status given by the CT2 device. Within the same information, the modem will get the Identifier of the active slot which is used.
  • the ID of the command for establishing a voiceband data link is HI
  • the PowerBop system will detect the drop of the carrier. However the CT2 device will not issue a hangup command since there's no link to signal this. Rather the CT2 device will attempt to re-establish the link per the CAI specification requirements and will report this activity in the status.
  • the ID of the command for establishing a straight voice link is H2 A m 1 ⁇ H 1 2 CR
  • the PowerOff command is used to turn off the CT2 device (Controller board and tranceiver board). Active processes and active links are gracefully terminated and configuration data is stored into the CT2 EEPROM. In that mode the CT2 device will then not be able to accept incoming calls, and will not be able to issue any link access.
  • the modem After issuing completely that command, the modem will have to wait 3s before removing the power source in order to let the CT2 device perform completely its Power Off sequence. Furthermore, no more status will be at that point available.
  • the ID of this com-mand is P0
  • the PowerOn command is used as a Warm boot command or as a Reset command to a presently powered CT2 device. Issuing that command will cause the CT2 device to reinitialize itself and lose all current configuration. Current configuration will not be saved in permanent memory, and on restart the last saved configuration will be recalled from the permanent memory (EE PROM).
  • the powerBook will just have to supply the voltage to the CT2 device.
  • the ID of this command is PI
  • the SaveSettings command is used by the modem to tell the CT2 Radio module to store the configuration data into its EEPROM. in that way if a drop of the power supply occurs, the CT2 module will always wake up in the programmed mode.
  • the Private Mode Command is used to switch the CT2 device in private mode. On reception of this command, the CT2 device will switch its mode to private and use the default private slot for its active slot. The active slot may b changed by issuing the Slot selection command. Link initiations will use the LID (Identifier) from the activ slot to contact the private base.
  • LID Identifier
  • the Public Mode Command is used to switch the CT2 device in public mode.
  • the CT2 device On reception of this command, the CT2 device will switch its mode to Public and use the default public slot for its active slot.
  • the active slot may be changed by issuing the Slot selection command.
  • Link initiations will use the LID (Identifier) from the activ slot to contact the public base.
  • the CT2 device To be able to register to a Private base by using this command, the CT2 device needs to have a private empty slot. It is the ceremoniesity of the modem (user) to determine if a slot is available or not. The CT2 device will return a LID) value $0401 to $FFFE if the slot is presently occupied, and SFFFF if the slot is empty. In the case there are no private empty slots available, the user will have to liberate one, or will not be able to register. The registration initiates in the same time a link access, as it is an over the air process.
  • the user To deregister from a private base, the user has to issue that command on the non empty slot which contains the LID of the base to be deregistered. in that case the deregistration occurs over the air.
  • the CT2 device does not absolutely need to have a public empty slot for this kind of registration. Initiation of public registration on an already busy slot will overwrite the existing registration. It is however the proprietority of the modem (user) to determine if a slot can be used or not.
  • the CT2 device will return a LID value $0000 to $03EF if the slot is presently occupied, and $FFFF if the slot is empty.
  • the PowerBop system When registering to a Telepoint Service Provider, the PowerBop system has to enter several blocks of data. Let's describe the way the blocks are entered into the system.
  • the Application will have to send a AT ⁇ KP# command. This command will cancel the Telepoint registration and will cause the CT2 module to be back in idle mode. Note: If an error occurs on the last block, it will break the complete registration, and it will not be possible to reenter the block again. In this case the user will have to go through the entire registration process again.
  • OTAR Public registration has been introduced later, and has been provided to simplify the registration process. It is an over the air registration, which is done after a link is established between the PowerBop system and the public network. Much less data is required to be exchanged between the system and the Public network.
  • the same kind of user (Application) interface will be provided to enter the data needed for the registration, and the AT ⁇ B command has to be used. Generally only 1 block is needed for that type of registration.
  • the User Interface will provide an OTAR/Manual selector, and will have a Registration activator.
  • the Application will send to the modem the following commands:
  • This deRegistration command is valid only locally (without accessing any base station) to the PowerBop system. It can be done both in Private mode and in Public mode. Prior to this local deregistration the right slot and the right mode (Public or private) have to be selected - See command below.
  • the ID of this command is KPS4MC
  • Terminal deregistration is a local process (no link needs to be established), we can see as it is a Slot eraser command, which makes the Slot selected free again.
  • a Slot eraser command which makes the Slot selected free again.
  • the user needs to be aware that he will not be any more able to connect to the Public network, and that he will need to contact the Service provider to do the registration process again.
  • the Localization command is used to let the PowerBop system receive incoming calls. It can be done only in Public mode. Prior to issue that command, a link between the PowerBop system and a Public base has to be setup .
  • the ID of this command is LI (Corresponding to KPS8 of th Handset ) A
  • the Page Info message has to be handled by the PowerBop system.
  • the duration of the Localization will be forced to a predetermined time.
  • the modem or the CT2 device will perform an Energy detection to know when the Vocal message is finished, and then will know that it can send the Duration to the Public base.
  • the PowerBop system will have to recover the frequency of the Polling sequence the Public base will return in the Page Info message.
  • the DeLocalization command is used to let the PowerBop stop receiving incoming calls. It can be done only in Public mode. Prior to issue that command, a link between the PowerBop system and a Public base has to be set up.
  • the ID of this command is L0 (Corresponding also to KPS8 of the Handset)
  • This Command is used to select a specific slot in either private mode or public mode.
  • the PowerBop system has 8 private slots and 8 public slots.
  • KPS4n n range is from 1 to 8 in Private mode n range is from 1 to 4 in Public mode
  • This command is used by the Modem to retrieve the Electronic Serial Number of the CT2 module to which it is connected.
  • the ID of this command is EO
  • the modem After sending that command the modem will setup itself in Receive mode, and will expect the data composing the ESN to arrive through the SCI in asynchronous format.
  • the ESN is composed of 12 digits, which are just going to be appende to the AT status identifier, and this will look like:
  • the PowerBop system will first hav to wait, that a link has been established. After that, the Key Press command is used to pass to the CT2 device th Dial String.
  • the dial string has to contain a "#" character at the end, in the case the dialing occurs in Public mode.
  • the Status is used by the CT2 device to report som information to the modem (which controls all the PowerBo device) about the progress of the different processes engaged.
  • the modem will use the AT ⁇ KP command with the right keys included.
  • All the information is retreived each time the modem wants to know the status. All the bits are grouped in 2 bytes, where some of the bits are reserved for future use. The rest of the information will be put in bytes for every digit listed above.
  • the Status is composed in total of 7 bytes plus the AT characters for synchronization, and a special character ( ' ) different from the previous one ( ⁇ ), to differentiate Commands and Status.
  • the Status byte 1 includes the first part of all the bits previously described in the following order:
  • the Status byte 2 includes the second part of all the bits previously described in the following order:
  • AT ⁇ S ⁇ CR> -> ⁇ - AT ⁇ 804131323334000D means the CT2 module is ready, it is in public mode, and the slot selected is the first one.
  • the LID of the slot selected is 1234, and the block number is 0.
  • This second status format will be used to perform on the Macintosh side the Handset Keyboard emulation.
  • the system will handle that feature by using the AT ⁇ KP command for sending any Key presses informations, and will use the status described below to get the data which needs to be displayed on the Handset emulator.
  • the CPU will need to simulate the different icons available on the handset display plus the different strings which are normally displayed during the operation.
  • Each icon has 3 different states: On, Off, or Blinking. To encode each icon, 2 bits are needed which makes a total of 14 bits. However to keep the handset compatibility (which is forecasting extra icons for the future), 3 bytes in total are used.
  • figure 6 is a drawing reproducing the display of the Silverlink handset and showing where the different icons are located.
  • each icon is described with 2 bits. These bits will be set and reset in the following way to indicate if the icon is on, off or blinking.
  • Busyl I Busy2 jPubl
  • the handset display is composed with a 12 digits display. In any case even if some strings are bigger than 12 characters, only the last 12 ones will be displayed.
  • the kind of strings which have to be displayed are generally message coming from the network or the private base station to which the system is linked to.
  • the CT2 module will append those 12 characters to the 2 icon bytes and the modem will retreive them to display them on the handset emulator
  • the hardware interface between the modem and the CT2 device for analog signals is 2 signals for Tranmit analog, 2 signals for Receive analog, and 1 signal for GND. It is what we call a 4 wires interface.
  • PSTN mode the modem works in 2 wires mode. In that case the Ring information comes on what is the RXA signal in 4 wires mode.
  • the CT2 device will emulate the Ring signal, by modulating a special wire which will be routed to the Rxa Modem signal using an analog switch (See drawing below) . In that way the modem being in 2 wires mode at init time will see a normal ring. When all the link establishments will be done, the modem will pass then in 4 wires mode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Communication Control (AREA)
  • Computer And Data Communications (AREA)

Abstract

Un ordinateur conçu pour la communication à distance par l'intermédiaire d'un réseau téléphonique comprend en combinaison: une unité informatique (11); un modem (12) connecté à l'unité informatique et conçu pour être raccordé au réseau téléphonique par l'intermédiaire d'un cordon (12a); un circuit émetteur/récepteur (14) adapté pour établir des appels par radio avec un site distant, et également pour accéder au réseau; un circuit de commande (13) destiné au circuit émetteur/récepteur; des moyens ménagés dans l'ordinateur en vue d'appliquer des instructions au modem à partir d'un ensemble prédéfini d'instructions; des moyens déterminant les appels par cordon ménagés dans l'ordinateur afin de déterminer si un appel téléphonique par l'intermédiaire du cordon est désiré ou est en cours, et afin de générer un signal; des moyens soit pour traiter des instructions reçues dans le modem, soit pour les convertir en instructions spécifiques destinées au circuit de commande, en fonction de ce signal; et des moyens ménagés dans ce circuit de commande pour traiter ces instructions spécifiques. L'invention se rapporte également à un procédé destiné à être mis en ÷uvre par l'ordinateur.
PCT/IB1994/000109 1993-05-17 1994-05-17 Procede et ordinateur pourvu de moyens de communication a distance par l'intermediaire d'un reseau telephonique utilisant un mode fil ou un mode radio WO1994027412A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU66865/94A AU6686594A (en) 1993-05-17 1994-05-17 A method and computer provided wtih means for remote communication via a telephone network using a wire mode or a radio mode
EP94914523A EP0699370A1 (fr) 1993-05-17 1994-05-17 Procede et ordinateur pourvu de moyens de communication a distance par l'intermediaire d'un reseau telephonique utilisant un mode fil ou un mode radio

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9305932A FR2710485B1 (fr) 1993-05-17 1993-05-17 Ordinateur pourvu de moyens pour communiquer à distance via un réseau téléphonique selon un mode filaire ou un mode radio, et procédé mis en Óoeuvre par l'ordinateur.
FR93/05932 1993-05-17

Publications (1)

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WO1994027412A1 true WO1994027412A1 (fr) 1994-11-24

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Country Status (4)

Country Link
EP (1) EP0699370A1 (fr)
AU (1) AU6686594A (fr)
FR (1) FR2710485B1 (fr)
WO (1) WO1994027412A1 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
GB2295523A (en) * 1994-11-26 1996-05-29 Motorola Israel Ltd Data radio equipment and method of controlling a radio and a radio modem
WO1996035286A1 (fr) * 1995-05-03 1996-11-07 Nokia Mobile Phones Ltd. Adaptateur de donnees

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FR2592253A1 (fr) * 1985-12-21 1987-06-26 Ricoh Kk Appareil de communication equipe pour deux modes de transfert des informations, notamment telecopieur raccordable au reseau telephonique et a un reseau de radiocommunication
US4837800A (en) * 1988-03-18 1989-06-06 Motorola, Inc. Cellular data telephone system and cellular data telephone therefor
WO1990003076A1 (fr) * 1988-09-01 1990-03-22 Intelligence Technology Corporation Procede et appareil de commande de transmission de signaux de voix et de donnees
EP0418165A1 (fr) * 1989-09-15 1991-03-20 Apple Computer, Inc. Modem reconfigurable pour ordinateur ou analogue
WO1991007044A1 (fr) * 1989-10-31 1991-05-16 Intelligence Technology Corporation Transmission de donnees et de voix par un systeme telephonique cellulaire
US5127041A (en) * 1990-06-01 1992-06-30 Spectrum Information Technologies, Inc. System and method for interfacing computers to diverse telephone networks
US5202899A (en) * 1991-08-16 1993-04-13 Rockwell International Corporation Apparatus for providing dynamic selection of modem protocol to support multiple modem types
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FR2592253A1 (fr) * 1985-12-21 1987-06-26 Ricoh Kk Appareil de communication equipe pour deux modes de transfert des informations, notamment telecopieur raccordable au reseau telephonique et a un reseau de radiocommunication
US4837800A (en) * 1988-03-18 1989-06-06 Motorola, Inc. Cellular data telephone system and cellular data telephone therefor
WO1990003076A1 (fr) * 1988-09-01 1990-03-22 Intelligence Technology Corporation Procede et appareil de commande de transmission de signaux de voix et de donnees
EP0418165A1 (fr) * 1989-09-15 1991-03-20 Apple Computer, Inc. Modem reconfigurable pour ordinateur ou analogue
WO1991007044A1 (fr) * 1989-10-31 1991-05-16 Intelligence Technology Corporation Transmission de donnees et de voix par un systeme telephonique cellulaire
US5127041A (en) * 1990-06-01 1992-06-30 Spectrum Information Technologies, Inc. System and method for interfacing computers to diverse telephone networks
US5202899A (en) * 1991-08-16 1993-04-13 Rockwell International Corporation Apparatus for providing dynamic selection of modem protocol to support multiple modem types
WO1993007707A1 (fr) * 1991-10-11 1993-04-15 Apple Computer Inc. Procede et dispositif de detection d'une sequence d'echappement dans un modem

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2295523A (en) * 1994-11-26 1996-05-29 Motorola Israel Ltd Data radio equipment and method of controlling a radio and a radio modem
AU698135B2 (en) * 1994-11-26 1998-10-22 Motorola Israel Limited Data radio equipment and method of controlling a radio and a radio modem
WO1996035286A1 (fr) * 1995-05-03 1996-11-07 Nokia Mobile Phones Ltd. Adaptateur de donnees
GB2313526A (en) * 1995-05-03 1997-11-26 Nokia Mobile Phones Ltd Data adapter
GB2313526B (en) * 1995-05-03 1998-04-22 Nokia Mobile Phones Ltd Data adapter
AU693027B2 (en) * 1995-05-03 1998-06-18 Nokia Technologies Oy Data adapter
US5884103A (en) * 1995-05-03 1999-03-16 Nokia Mobile Phones, Ltd. Data terminal with adapter for selectively modifying data transmitted to and from
DE19680530B4 (de) * 1995-05-03 2004-04-08 Nokia Mobile Phones Ltd. Datenadapter

Also Published As

Publication number Publication date
FR2710485B1 (fr) 1995-12-22
FR2710485A1 (fr) 1995-03-31
AU6686594A (en) 1994-12-12
EP0699370A1 (fr) 1996-03-06

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