The second order digital multiplexing equipment using positive/zero/negative justification, which is described below, is intended for use on digital paths between countries using primary 2048 kbit/s multiplexing equipment such as PCM multiplexing equipment conforming to Recommendation G.732, or any other identical equipment.
ITU-T G.745 FRENCH-1993 history
1993ITU-T G.745 FRENCH-1993 SECOND ORDER DIGITAL MULTIPLEX EQUIPMENT OPERATING AT 8448 kbit/s AND USING POSITIVE/ZERO/NEGATIVE JUSTIFICATION