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