Interface 710 generates a header error correction code, adds the HEC code to the header, packs {HEAD ~ the ATM cells} into the STS 3c frame, and sends {TAIL ~ the data} out serially at the 155.52 Mbps data rate 
Interface 710 generates a header error correction code , adds the HEC code to the header , packs { HEAD ~ the ATM cells } into the STS 3c frame , and sends { TAIL ~ the data } out serially at the 155.52 Mbps data rate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH