6100 BSC Programming Manual

6100 BSC Concepts and Context
Application-Supplied
BSC-Supplied
Blocking with ETB Blocking with ITB
Transmitting Station:
Receiving Station:
Transmitting Station:
Receiving Station:
PAD SYN...SYN SOH DATA
ETB
BCC PAD
PAD
SYN...SYN
PAD
PAD
SYN...SYN
ACK1 PAD
PAD SYN...SYN
SOH DATA
ITB BCC
SYN
PAD
SYN...SYN
ACK0
PAD
PAD
SYN...SYN
STX
TEXT
ETB BCC
PAD
PAD SYN...SYN
STX
TEXT ETX
BCC
PAD
ACK0
SYN DATA ITB BCC
SYN
SYN
STX
TEXT ITB
BCC SYN SYN
TEXT
ETX BCC PAD
Block #1 Block #2 Block #3
BCC Accumulation
BCC Accumulation
BCC Accumulation
Acknowledges Block #1
Acknowledges Block #2
Acknowledges Whole Message
BCC Accumulation BCC Accumulation BCC Accumulation BCC Accumulation
S5066-006
Figure 1-6. Message Blocking
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