| http://www.w3.org/ns/prov#value | - A digital loop carrier disposed between a switching unit and a plurality of subscribers, said digital loop carrier comprising:a high-speed optical interface part connected to an optical fiber transmission line; cross connect means including a cross connect part for an STS-1 signal level and a cross connect part for a VT signal level, for switching, to different lines, a high-speed signal input to
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