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Segmentation Sublayer MAP Packet Service MAP Packet Processing MAP Access Service MAP Generatio n MAP Demultiplexing COP Mgmt Service VC Packet VC Access Service Service VC Packet Processing Transfer Sublayer Virtual Channel Generation Virtual Channel Multiplexing VC_FSH Service VC Frame Service Master Channel Insert Service MC Frame Service Master Channel Generation Master Channel Multiplexing All Frames Generation Figure 2-6: Internal Organization of Protocol Entity (Sending End) Figure 4-14: Internal Organization of Protocol Entity (Sending End) Segmentation Sublayer MAP Packet Service MAP Packet Extraction MAP Access Service MAP Reception MAP Demultiplexing VC Packet VC Access Service Service VC Packet Extraction Transfer Sublayer Virtual Channel Reception Virtual Channel Demultiplexing VC_FSH Service VC Frame Service Master Channel Insert Service MC Frame Service Master Channel Reception Master Channel Demultiplexing All Frames Reception Figure 2-6: Internal Organization of Protocol Entity (Receiving End) Figure 4-14: Internal Organization of Protocol Entity (Receiving End) MAP Packet Service Packet MAP Access Service Packet Service VC_FSH Service VC_OCF VC Frame Service Service MAP_SDU Packet FSH VC_OCF MAPID Master Channel Insert Service VC Frame VCID MC Frame Service Insert MC Frame MCID All Frame Key Multiplexer/ DeMultiplexer Figure 2-7: AOS/TM Space Data Link Protocol Channel Tree TC Transfer Frame Transfer Frame Primary Header 5 Octets Master Channel Insert Zone (Optional) Optional Transfer Frame Secondary Header (Optional) Transfer Frame Data Field Up to 64 Octets Varies Up to 1019 Octets Figure 4-1: TC Transfer Frame Structural Components Frame Error Control Field (Optional) 2 Octets 2 bits 1 bits 10 bits 2 Octets Reserved Spare Command Control Flag Sec Header Flag Transfer Frame Version Number Bypass Flag TC Transfer Frame Primary Header (5 Octets) 1 bits 1 bits Spacecraft Virtual Channel ID ID 6 bits Frame Length Virtual Channel Frame Sequence Count 10 bits 2 Octets Figure 4-2: TC Transfer Frame Primary Header 1 Octets