Link Layer Services (more) ▣Flow Control&. o pacing between adjacent sending and receiving nodes ▣Error Detection: o errors caused by signal attenuation,noise. o receiver detects presence of errors: signals sender for retransmission or drops frame ▣Error Correction: o receiver identifies and corrects bit error(s)without resorting to retransmission Half-duplex and full-duplex o with half duplex,nodes at both ends of link can transmit, but not at same time 5:DataLink Layer 5-75: DataLink Layer 5-7 Link Layer Services (more)  Flow Control:  pacing between adjacent sending and receiving nodes  Error Detection:  errors caused by signal attenuation, noise.  receiver detects presence of errors: • signals sender for retransmission or drops frame  Error Correction:  receiver identifies and corrects bit error(s) without resorting to retransmission  Half-duplex and full-duplex  with half duplex, nodes at both ends of link can transmit, but not at same time