Method of transmitting modulation demodulator signal in IP network
A modem, IP network technology, applied in transmission systems, digital transmission systems, telephone communications, etc., can solve the problems of lack of modem connection, increased data volume, connection interruption, etc., to avoid data loss and reliable data transmission. Effect
Inactive Publication Date: 2007-09-05
ZTE CORP
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Problems solved by technology
Because there is the possibility of IP packet loss and packet delay jitter in the IP network, if the media gateway directly puts the digitized modem signal into the IP packet for transmission, it will cause distortion of the converted modem signal at the opposite end, resulting in modem If the connection is not connected or the connection is often interrupted, the transmission will fail, and directly putting the digital modem signal into the IP packet will lead to an increase in the amount of data and a decrease in the transmission efficiency of the IP network
Therefore, with the existing technology, it is impossible to transmit digital modem signals in the IP network
Method used
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[0015] The technical solution of the invention will be described in detail below in conjunction with the embodiments and with reference to the drawings.
[0016] Referring to the schematic diagram of the functional module of the present invention shown in FIG. 1, in the IP gateway, there are N subscriber lines and trunk line modem signals 101 input into the modem transceiver module 102, and the data composition can be demodulated through sending processing. The IP data packet transmitted in the IP network reaches the receiving end of the IP network through the transmission and exchange of the IP network. The main body of the information constituting the IP data packet is stored in the receiving buffer area 103, and then received and processed by the modem transceiver module 102 , After modulating the data again, send it to the corresponding subscriber line or trunk line. Each modem signal corresponds to a modem and a data frame buffer area, and the modem can work in duplex mode.
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The method includes such steps as recovering signals to data at sending end by demodulating modem signals from each route, the data constitute frames stored in buffer area; building up IP data packets from data stored in each buffer area; sending constructed IP data packets to receiving end; receiving end receives IP data packets from sending end; receiving end picks up data frames in data area of IP data packets and saves the data in each receiving buffer area; modulating signal data in each buffer area to modem signal for line loop or trunk line linked to PSTN, and clearing relevant data area. In the method, signal is not easy to be interrupted to guarantee normal communication. Data flow rate is controlled at receiving end and transmitting end. Thus, loss of data caused by different speed at two ends is avoided to provide reliable transmission.
Description
Technical field [0001] The invention relates to a signal transmission method in an IP network, in particular to a method for realizing modem signal transmission in an IP network by using data encapsulation. Background technique [0002] At present, the user’s modem signal is converted into a digitized modem signal through a digital program-controlled telephone exchange or other telephone user access equipment, and then transferred to the peer digital program-controlled telephone exchange or telephone user access equipment through time-division circuit switching and then converted. The analog modem signal is sent to the receiving modem, thereby realizing the transmission of the modulation and demodulation signal. The receiving device at the opposite end can also be an IP access server that can receive digitized modem signals, and the modem can be used to connect to the Internet through the IP access server. As circuit-switched networks evolve to IP network...
Claims
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IPC IPC(8): H04L12/56H04L12/24H04L29/06H04M11/06H04M3/22H04L12/861
Inventor 雷海强倪明羊峥嵘
Owner ZTE CORP