Which is CORRECT?
A) The Optical Carrier (OC) is an ITU-T international standard.
B) DS (Digital Signal) speeds are multiples of 64Kbps, data rate of a voice call.
C) Optical Carrier (OC) speeds are multiples of 155 Mbps.
D) The STM (Synchronous Transport Module) standard was introduced for twisted pairs.
E) Both DS and OC standards were introduced at the same time.

Question

Quizplus · Accepted Answer

DS (Digital Signal) levels, such as DS1 (T1), DS3 (T3), and so on, are indeed based on multiples of the 64Kbps data rate, which is the standard rate of a digital voice call. This structure allows for efficient multiplexing of voice and data communications.

Which Is CORRECT