| http://www.w3.org/ns/prov#value | - For a 2B+D type 144 Kbit/s digital line, the subscriber line interface IL is either an echo cancelling circuit such as described, for example, in Commutation et Transmission, No. 4, 1988, pp. 67 to 83, in Equipements de Transmission RNIS a 144 Kbit/s de Deuxieme Generation pour reseau de distribution (Second Generation 144 Kbits/s ISDN Transmission Equipment for Distribution Networks) by F.
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