In the receive direction, {HEAD ~ the interface} receives {TAIL ~ a 155.52 Mbps serial data stream}, removes the ATM cells from the STS 3c framing, and verifies the HEC code 
In the receive direction , { HEAD ~ the interface } receives { TAIL ~ a 155.52 Mbps serial data stream } , removes the ATM cells from the STS 3c framing , and verifies the HEC code
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH