Question

What is a Digital Service (DS) level and framing specification for digital streams over circuits in the North American transmission hierarchy at 1.544 Mbps?

Answer 1

DS-1

Step-by-step explanation:

DS-1 known also as carrier T1 is part of the T carrier hierarchy and has 24 channels. It was created by AT&T in 1957 and implemented in 1960. DS means digital signal which implies that it was meant for digital signals communication and it was used to transmit voice signals in a long- hual pause code modulation transmission.there are signal levels or carriers in the T carrier hierarchy ranges from 64kbps(DS0) to 274Mbps(DS4).