Use of Telecommunication Terms for Maintenance - General Maintenance Principles - Maintenance of International Transmission Systems and Telephone Circuits (Study Group IV) 1 pp
DCSs may also process the D-channel. They may break the D-channel layer 2, so that there are two tandem layer 2 links between the NT2 and the ET. The DCS routes layer 3 packets from the NT2 either to the exchange or to the leased network based on the rout