Packet (Digital) Switching

• Packets- sampling the analog/voice or using digital
• Address
• ID for where in message sample is from
• Code to verify integrity of message
• Message

• Switches/nodes along the path-
• Initial node-
• cuts up message into packets-
• feeds to network
• re-sends messages when asked
• Switching Node/s
• Knows 'state of neighboring network'
• Sends packet onto open or most efficient line- at that moment
• End point Node
• Accepts the packets
• Re-assembles packets in proper order
• Tests integrity of packets and their completeness: (1) ask to resend packet/s or (2) convert to final analog signal