Patent ID: 8582976
Filing Date: 2013-11-12
Classification: H04B,H04M,Y02D

Abstract:
1. A method of delivering broadband signals over an optical link for subsequent transport over a telephony connection, the telephony connection having a constraint profile associated therewith according to which a maximum allowed power of transmitted broadband signals is specified as a function of frequency, the constraint profile having a first spectral region and as a second spectral region within the frequency range of the broadband signals, the specified power level in the second spectral region being, at least on average, lower than that in the first spectral region, the method comprising: performing pre-emphasis on the broadband signals such that the amplitude of the signals in the second region is increased relative to the amplitude of the broadband signals in the first region, thereby causing the level of at least some of the signals to exceed that specified by the constraint profile; subsequently transmitting the signals over the optical link; performing de-emphasis on the broadband signals after the broadband signals have been transmitted over the link so as to reverse the previously performed pre-emphasis and return the signals to levels within those specified by the constraint profile; and after de-emphasis has been performed, launching the broadband signals onto the telephony connection, wherein the broadband signals are analogue signals, and wherein the analogue broadband signals are subjected to an analogue-to-digital conversion process for transmission over the link before being converted back into analogue signals by a digital-to-analogue conversion process after transmission over the link.