This Recommendation provides characteristics for: in accordance with definitions given in ITU-T Q.55 1 particularly in Figure UQ.55 1, 2-wire analogue interfaces (Type C2 and Z); input and output connections with 2-wire analogue interfaces; and half-connections with 2-wire analogue interfaces
ITU-T Q.552 FRENCH-2001 history
2001ITU-T Q.552 FRENCH-2001 Transmission characteristics at 2-wire analogue interfaces of digital exchanges