Digital cross connectors (DXCs)
In the area of the subscriber network nodes the users are connected to the exchanges
(DSC) via the user network interface (UNI). Instead of this central switching
points local cross connects (DXC) should be used.
Cross connect systems are the heart and as such they determine the structure of the trunk network. The physical specifications for the NNI are contained in Re. G.703 (electrical) and G.957(optical).
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