prENV 50XXX

Network performance - 1) serveability performance objectives for PTNs 2) general parameters for speech transm. in PTNs; 3) 2-wire analogue interfaces of PTNXs; 4) 4-wire analogue interfaces of PTNXs; 5) digital interfaces of PTNXs; 6) overall transmission plan for voice connections through PTNs; 7) Overall transmission plan of PTNs