642-321 - Cisco Optical SDH Exam (SDH) Practice Test Questions Crack Torrent (Activation Code) [Latest] 2022 The 642-321 exam will test your 642-321 exam knowledge and understanding on the following topics: QUESTION Show 2 A When is the SDH connection between the optical interfaces established? ANSWER QUESTION What is the minimum wavelength spacing for SDH? ANSWER Show 2 A (In meters) QUESTION What is the difference between a SONET OC-48 and a SONET OC-192 interface? ANSWER Show 2 A SONET OC-192 interface has the following properties: - SP: 1.25 Gb/s - OS: 4-byte time slots - SDH: 1.25 Gb/s bit-interleaved-parity- (BIS) - signal formats: 8 bits/5 MS - formatting: bit-interleaved- QUESTION Describe the four-layer G.707 signal format. ANSWER Show 2 A The G.707 signal format is the same as the SDH signal format, except for the following: - Two timeslots are used for SDH: 48,192,768 - The number of bits per second is 1.25 Gb/s instead of 2.5 Gb/s - The number of bytes per second is 1.25 Gb/s instead of 2.5 Gb/s - The bit order is bit-and-byte instead of bit-and-parity-and-byte QUESTION When is the SDH connection between the optical interfaces established? ANSWER Show 2 A SDH connection is established on the second of two successive zero A bit timeslot (A-Z0). The connection is reset on the next A-Z1 bit timeslot. QUESTION What is the difference between an optical interface designated as SDH-OC-48 and an optical interface designated as SDH-OC-192? ANSWER Show 2 A A 1.25 Gb/s interface designated as OC-48 is equivalent to a 10.5 Gb/s SDH-OC-48 interface. 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