Question

In SONET, each synchronous transfer signal STS-n is composed of __________

(a) 2000 frames

(b) 4000 frames

(c) 8000 frames

(d) 16000 frames

Answer 1

Correct answer is (c) 8000 frames

Easiest explanation: SONET defines the electrical signal as STS-N (Synchronous Transport Signal Level-N) and the optical signal as OC-N (Optical Carrier Level-N). The building block of SONET is the STS-1/OC-1 signal, which is based on an 8-kHz frame rate and operates at 51.84 Mbps.