4. A T-1 trunk carries a stream of 24-byte (192 bits, neglecting the frame sync bit) TDM frames of 125 usec each, whereas a SONET OC-1 fiber, or "pipe, carries a stream of 810-byte TDM frames called STS-1 frames. (This results from 810 terminals (corresponding to the dots) inside the multiplexer, compared to 24 terminals for the T1 multiplexer.) As a result, it takes exactly one byte (1 slot = 8 bits) per STS-1 frame to support a 64-kbps DS-O data stream (PCM voice). Given that the bit rate of an OC-1 pipe is 51.84 Mbps (a) Find the multiplexer rotating speed. (b) Within each 810-byte STS-1 frame, 36 bytes must be reserved for signaling and control thus leaving 774 bytes for payload data which may come from multiple T-1 trunks. Find the maximum number of T-ls (DS-1 data streams) that can be multiplexed (TDMed) to an OC-1 pipe. (Note: the 36 signaling and control bytes in an STS-1 frame are not available for carrying the incoming T-1 data) 4. A T-1 trunk carries a stream of 24-byte (192 bits, neglecting the frame sync bit) TDM frames of 125 usec each, whereas a SONET OC-1 fiber, or "pipe, carries a stream of 810-byte TDM frames called STS-1 frames. (This results from 810 terminals (corresponding to the dots) inside the multiplexer, compared to 24 terminals for the T1 multiplexer.) As a result, it takes exactly one byte (1 slot = 8 bits) per STS-1 frame to support a 64-kbps DS-O data stream (PCM voice). Given that the bit rate of an OC-1 pipe is 51.84 Mbps (a) Find the multiplexer rotating speed. (b) Within each 810-byte STS-1 frame, 36 bytes must be reserved for signaling and control thus leaving 774 bytes for payload data which may come from multiple T-1 trunks. Find the maximum number of T-ls (DS-1 data streams) that can be multiplexed (TDMed) to an OC-1 pipe. (Note: the 36 signaling and control bytes in an STS-1 frame are not available for carrying the incoming T-1 data)