CN200973109Y

CN200973109Y - Network double-frequency radio modem

Info

Publication number: CN200973109Y
Application number: CN 200620047473
Authority: CN
Inventors: 李华刚; 蒋晶
Original assignee: SHANGHAI CORTELCO INFORMATION TECHNOLOGY Co Ltd
Current assignee: SHANGHAI CORTELCO INFORMATION TECHNOLOGY Co Ltd
Priority date: 2006-11-03
Filing date: 2006-11-03
Publication date: 2007-11-07
Anticipated expiration: 2016-11-03

Abstract

The utility model provides a network double-frequency wireless modem, which comprises a main module, as well as an asynchronous serial interface module, an Ethernet interface module and an audio interface module respectively in the circuit connection with the main module, and a SIM card power supply module, a SIM card slot module and a DC power supply module in the circuit connection with the main module in succession and also an external antenna connected to the main module, wherein the main module comprises a radio frequency functional block and a base belt control module in the circuit connection. The utility model provides a network double-frequency wireless modem, and is applicable for all equipments with the serial port terminal to provide the wireless communication ability to the terminal equipment without the TCP/IP protocol processing function and support the data, fax, short massage (supporting the point-to-point and small-zone broadcast) and voice transmission.

Description

Network double-frequency wireless modem

Technical field

The utility model relates to a kind of double-frequency wireless modem that is used for global system for mobile communications and GPRS network, is mainly used in the wireless data transmission business.

Background technology

Modem (modulator-demodulator) is the abbreviation of Modulator/DEModulator (modulator/demodulator).It is by modulation digital signal to be converted to analog signal at transmitting terminal, and is a kind of device of digital signal at receiving terminal again with analog signal conversion by demodulation.

Information in the computer is formed digital signal by " 0 " and " 1 ", and what pass in phone line can only be analog electrical signal.So, when two computers will carry out transfer of data by telephone wire (dialling up on the telephone), just need an equipment to be responsible for the conversion of digital-to-analogue such as us.This digital to analog converter is exactly Modem.Computer is converted to corresponding analog signal to digital signal by Modem earlier when sending data, this process is called " modulation ".Before the signal of ovennodulation is sent to another computer by telephone carrier, also to be responsible for analog signal is reduced to the digital signal of calculating function identification via recipient's Modem, this process is called " demodulation ".Digital-to-analogue conversion process by such one " modulation " and " demodulation " just, thus realized telecommunication between two computers.

Modal Modem is exactly the modulator-demodulator by the online of telephone wire dial mode.This network access is fewer for ISP and net user's initial investment, need not to transform circuit, installs also fairly simplely, and this mode is substantially all adopted in therefore early stage online.Popular along with broadband network, more high speed Modem (also being referred to as basic Modem) can more and more enter people's life.And the high speed modem of technical grade need be applied to occasion widely, and the device category of required connection is more, and the reliability requirement height is so have higher requirement to the development of modem.

GPRS is that the English of GPRS is called for short, and is a kind of new bearer service that development is come out on existing gsm system, and purpose is the data service that block form is provided for GSM user.GPRS adopts and the same wireless-modulated standard of GSM, same frequency band, same burst structure, same frequency hopping rule and same tdma frame structure, this new Packet Data Channel and current Circuit-switched voice service channel and similar.Therefore, GPRS is widely used in present network.The development of Modem must be supported gprs service, just can provide more flexible, uses widely.

Nowadays the modulator-demodulator based on GSM/GPRS that occurs on the market can satisfy the application of general access network, but still abundant inadequately aspect interface.What have only has serial line interface and an antennal interface.Though it is this can satisfy certain application requirements, still perfect inadequately aspect flexible networking.The not embedding ICP/IP protocol stack that has has just limited not with the service of the terminal of ICP/IP protocol stack.

The utility model content

The network double-frequency wireless modem that the utility model provides, be applicable to the equipment of all band serial port terminals,, support data for the terminal equipment that does not possess the ICP/IP protocol processing provides wireless communication ability, fax, the transmission of note (supporting point-to-point and Cell Broadcast CB) and voice.

In order to achieve the above object, the utility model provides a kind of network double-frequency wireless modem, and it comprises primary module, and the difference circuit connects Asynchronous Serial Interface module, ethernet interface module and the audio interface module of primary module;

Described primary module is the nucleus module of the network double-frequency wireless modem that provides of the utility model, also be this modem feature module mainly is provided, primary module comprises radio-frequency enabled piece and the base band control module that circuit connects;

Described radio-frequency enabled piece meets the GSM/GPRS network communications standards for equipment provides two kinds of frequencies with GSM/GPRS network service, supports the reception of GSM/GPRS network and sends standard;

Described base band control module possesses following some functions:

1, facsimile function: fax by modulator-demodulator, except that the expense of economizing next special-purpose facsimile machine, also can and need not elder generation file printout be come out directly the computer or the facsimile machine of the document facsimile in the computer to the other side; More can preserve easily or edit the fax that receives, overcome Common Facsimile Machine owing to the problem of using heat-sensitive paper to cause writing to disappear gradually, and because modulator-demodulator has used the technology of error correction, the fax quality is better than Common Facsimile Machine, especially all the more so for the fax of figure;

2, data transport functions: GPRS Class1 0 (up 21.4kbps, descending 85.6kbps or up 42.8kbps, descending 64.2kbps); Support PBCCH (Packet Broadcast Control CHannel of gprs system); MS class B (category-B portable terminal); Support GPRS channel coding rate 1,2,3,4 encoding schemes; CSD (circuit grouped data) speed can reach 14.4kbps; Support USSD (novel interactive mobile data services); The non-transparent mode transmission; V.110 (a kind of ITU standard);

3, SMS: support point-to-point MT and MO (descending and up); Support SMS (note) Cell Broadcast CB; Support text and PDU (protocol Data Unit) pattern;

4, phonetic function: MO/MT voice call function is provided, also support the emergency call function, many calls simultaneously, calling transfer, Call Waiting all are that effectively what these functions had can be specified by network operator, support half rate, full rate and enhanced full rate have echo elimination, the noise attenuation function;

5, other features: have phonebook function, support multiple telephone directory type; Support MPTY; Calling transfer; Real-time clock; Alarm management; DTMF is provided (multisound and double-frequency signal);

Described primary module produces (RESET) signal that resets automatically in the formation that powers on, send out a low level by every 500us and carry out resetting of primary module, and this signal only is used for promptly resetting, and this signal also can provide resetting of external equipment;

Described Asynchronous Serial Interface module (RS232) connects the primary module and the external equipment of modulator-demodulator inside, serial line interface is subjected to electrostatic protection, input and output for interface all have EMI/RFI (electromagnetic interference/radio frequency interference) function of shielding, 6 line serial line interfaces are followed the RS232 agreement flexibly, the available signal of interface comprises: TX (transmission) data, RX (reception) data, answer signal, transmit completion signal, data terminal is ready to complete signal, and signal is finished in the data setting, in addition, also has the data carrier detectable signal, the incoming call index signal;

Described ethernet interface module is connected for modulator-demodulator provides with the Ethernet of the exterior terminal that possesses the ICP/IP protocol processing, makes this modulator-demodulator possess networking capability and applied environment more flexibly widely;

Described audio interface module links to each other with external equipment by serial port connector, carries out communicating by letter of voice signal with primary module simultaneously, and according to the audio frequency connection of this audio interface inside modules, equipment is supported the input and output of single-ended and both-end balance simulation signal;

Further, the network double-frequency wireless modem that provides of utility model also comprises SIM (Subscriber Identity Module) card supply module, SIM card socket module and the direct current supply module that circuit successively connects described primary module; And the exterior antenna that connects primary module;

Described SIM card supply module is connected with primary module with the SIM card socket module, is the power supply of identification SIM card;

Described SIM card socket module provides the SIM card interface with outside 3V or 5V, self adaptation identification;

Described direct current supply module is in case is connected with primary module, with regard to permanent be that modulator-demodulator is powered;

Described exterior antenna links to each other with modulator-demodulator by SMA connector (a kind of reversed polarity connector), possesses the dual band frequencies operating characteristic, and impedance is 50 Europe, the minimum 2W of power output.

The network double-frequency wireless modem that the utility model provides aims at the machine of being integrated into-machine, the communications applications of people-machine and designing, be mainly used in the wireless data transmission business, directly towards manufacturer, application development, users such as the system integration and wireless communication system exploitation, the embedded TCP/IP of this modulator-demodulator (transmission control protocol/Internet Protocol) protocol stack, have the standard serial communication interface, antennal interface and Ethernet interface have following feature:

When 1, global system for mobile communications (GSM) frequency was 900MHZ, power was 2 watts (Watts);

When 2, the global system for mobile communications frequency was 1800MHZ, power was 1 watt (Watt);

3, have the flash memory of 32M bit and the static memory (SRAM) of 4M bit;

Real-time clock (RTC) function when 4, having;

5, there is echo to eliminate and the noise cancellation function;

6, has complete GSM or GSM/GPRS (GPRS) software stack;

7, with GPRS Class 10 (GPRS Class1 0) compatibility.

Description of drawings

Fig. 1 is the structural representation of the network double-frequency wireless modem that provides of utility model.

Embodiment

Followingly specify a kind of better embodiment of the present utility model according to Fig. 1:

As shown in Figure 1, the utility model provides a kind of network double-frequency wireless modem, and it comprises primary module 1, and the difference circuit connects Asynchronous Serial Interface module 2, ethernet interface module 3 and the audio interface module 4 of primary module 1;

Described primary module 1 is the nucleus module of the network double-frequency wireless modem that provides of the utility model, also be this modem feature module mainly is provided, primary module 1 comprises radio-frequency enabled piece and the base band control module that circuit connects;

Described base band control module possesses following some functions:

Described primary module 1 produces (RESET) signal that resets automatically in the formation that powers on, send out a low level by every 500us and carry out resetting of primary module, and this signal only is used for promptly resetting, and this signal also can provide resetting of external equipment;

Described Asynchronous Serial Interface module 2 (RS232) connects the primary module 1 and the external equipment of modulator-demodulator inside, serial line interface is subjected to electrostatic protection, input and output for interface all have EMI/RFI (electromagnetic interference/radio frequency interference) function of shielding, 6 line serial line interfaces are followed the RS232 agreement flexibly, the available signal of interface comprises: TX (transmission) data, RX (reception) data, answer signal, transmit completion signal, data terminal is ready to complete signal, and signal is finished in the data setting, in addition, also has the data carrier detectable signal, the incoming call index signal;

Described ethernet interface module 3 is connected for modulator-demodulator provides with the Ethernet of the exterior terminal that possesses the ICP/IP protocol processing, makes this modulator-demodulator possess networking capability and applied environment more flexibly widely;

Described audio interface module 4 links to each other with external equipment by serial port connector, carries out communicating by letter of voice signal with primary module 1 simultaneously, and according to the audio frequency connection of this audio interface inside modules, equipment is supported the input and output of single-ended and both-end balance simulation signal;

Further, the network double-frequency wireless modem that provides of utility model also comprises SIM card supply module 5, SIM card socket module 6 and the direct current supply module 7 that circuit successively connects described primary module 1;

And the exterior antenna 8 that connects primary module 1;

Described SIM card supply module 5 is connected with primary module 1 with SIM card socket module 6, is the power supply of identification SIM card;

Described SIM card socket module 6 provides the SIM card interface with outside 3V or 5V, self adaptation identification;

Described direct current supply module 7 is in case is connected with primary module 1, with regard to permanent be that modulator-demodulator is powered;

Described exterior antenna 8 links to each other with modulator-demodulator by SMA connector (a kind of reversed polarity connector), possesses the dual band frequencies operating characteristic, and impedance is 50 Europe, the minimum 2W of power output.

3, have the flash memory of 32M bit and the static memory (SRAM) of 4M bit;

Real-time clock (RTC) function when 4, having;

5, there is echo to eliminate and the noise cancellation function;

6, has complete GSM or GSM/GPRS (GPRS) software stack;

7, with GPRS Class 10 (GPRS Class1 0) compatibility.

Claims

1. a network double-frequency wireless modem is characterized in that, comprises primary module (1), and the difference circuit connects Asynchronous Serial Interface module (2), ethernet interface module (3) and the audio interface module (4) of primary module (1);

Described primary module (1) comprises radio-frequency enabled piece and the base band control module that circuit connects.

2. network double-frequency wireless modem as claimed in claim 1, it is characterized in that, described network double-frequency wireless modem also comprises Subscriber Identity Module supply module (5), Subscriber Identity Module socket module (6) and the direct current supply module (7) that circuit successively connects described primary module (1), and the exterior antenna (8) that connects primary module (1).