Patent ID: 8279859
Filing Date: 2012-10-02
Classification: H04J,H04L

Abstract:
1. An arrangement for transferring synchronizing information in a data transmission system, the arrangement comprising: a modulator arranged to generate a first analog signal modulated by said synchronizing information, a frequency spectrum of said first analog signal being located in a frequency range that falls outside data transmission bands of a modem line, the modem line connected to a first network element of said data transmission system and to a second network element of said data transmission system, and said first analog signal being a separate signal with respect to second analog signals generated by modems of the modem line; a first switching circuit arranged to connect said first analog signal to a data transmission cable that is a part of the modem line; a regenerator arranged to regenerate said synchronizing information from said first analog signal; and a second switching circuit arranged to connect said first analog signal from the data transmission cable to said regenerator, wherein said second switching circuit is provided with a filter, the stopband whereof covers the frequency range of the data transmission bands of the modem line.