This part of ISO/IEC 14709 specifies the design and configuration of Customer Premises Cabling for the connection of primary access ISDN equipment. It includes — design requirements for ISDN primary access point-to-point configuration; — cabling requirements for the installation of new cabling; — criteria for the use of existing cabling; — criteria for implementation of ISDN primary access on generic cabling systems according to ISO/IEC 11801. This standard applies to the customer premises cabling for the transmission of ISDN primary access signals as defined by ITU-T I.431. The requirements in this standard apply to the cabling for both 1,544 Mbit/s and 2,048 Mbit/s interfaces.