ITU-T Q.553-1989
Transmission Characteristics at 4-Wire Analogue Interfaces of a Digital Exchange - Digital Local@ Transit@ Combined and International Exchanges in Integrated Digital Networks and Mixed Analogue-Digital Networks - Supplements (Study Group XI) 12 pp

Standard No.

ITU-T Q.553-1989

Release Date

1989

Published By

ITU-T - International Telecommunication Union/ITU Telcommunication Sector