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

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

(a) 2000 frames

(b) 4000 frames

(c) 8000 frames

(d) 16000 frames

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Asked question is from SONET in portion Wireless LAN’s, Electronic Mail and File Transfer of Computer Network

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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.

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