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