Method and arrangement for transferring synchronizing information
A technology for synchronizing information and data transmission, which is applied in the direction of synchronizing devices, synchronizing information channels, multiplexing communication, etc., and can solve problems such as accounting for base station costs and degradation of synchronization quality and accuracy
Inactive Publication Date: 2008-12-03
TELLABS
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Problems solved by technology
Also, for political reasons, jamming signals may be added to the messages sent by the satellites, which often degrades the accuracy of the synchronization quality
Method used
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[0027] Fig. 1 is explained above in connection with the description of the prior art.
[0028] figure 2 An example of a data transmission system for transmitting synchronization information with an apparatus according to an embodiment of the invention is shown. The data transmission system includes: a first network element 201 , a second network element 202 and a modem line 203 , and the modem line 203 is configured to establish a bidirectional data transmission connection between the network elements 201 and 202 . The modem line 203 includes: modems 204 and 205 and a data transmission cable 206, the data transmission cable 206 may be, for example, a twisted pair or a coaxial cable. The means for transmitting the synchronization information includes a modulator 207 configured to generate an analog signal 222 modulated by the synchronization information, the frequency spectrum of which lies in a frequency range outside the data transmission frequency band of the modem line 203...
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The invention relates to a method and arrangement for transferring synchronizing information in a data transmission system including modem connections. The arrangement according to the invention comprises a modulator (207) that is arranged to generate an analog signal (222) modulated by synchronizing information, the frequency spectrum of said signal being located in a frequency range that falls outside the data transmission bands of the modem line connected to the network element. The arrangement includes a switching circuit (208) that is arranged to connect said analog signal to a data transmission cable (206) that forms part of said modem line connected to a network element. The arrangement includes a second switching circuit (209) that is arranged to receive said analog signal from a data transmission cable that forms part of the modem line connected to the second network element. The arrangement also includes a regenerator (209) that is arranged to regenerate said synchronizing information from said analog signal.
Description
technical field [0001] The invention relates to a method and arrangement for transmitting synchronization information in a data transmission system including a modem connection. Background technique [0002] In many data transmission networks, the clock signals of the network elements need to be synchronized so that the frequency ratio of the clock signals of two or more discrete network elements is as accurate and constant as possible. Often an attempt is made to keep the instantaneous phases of the clock signals of the discrete network elements locked to each other as precisely as possible. The network element can be eg a router or a base station in a mobile telephone network. FIG. 1 shows an example of a data transmission system which requires synchronizing clock signals of base stations 101 and 102 of a mobile telephone network with each other. Base station 101 is connected to network element 110 via modem line 103 , while base station 102 is connected to network eleme...
Claims
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Login to View More IPC IPC(8): H04L7/00H04L12/56H04M11/06
CPCH04J1/00H04L7/0008H04J3/0635H04L7/02H04L7/065
Inventor 肯尼斯·哈恩海基·拉马宁米科·劳莱宁
Owner TELLABS