Exchange/RJE Manual

Contention for the Line
BSC Line Control
104698 Tandem Computers Incorporated C–7
Contention for the Line This figure shows the BSC line-control sequence during a transmission where there is
contention for the line.
002
Primary Station Secondary Station
ENQ
bid for line
(with one-second delay)
STX
text (odd)
ETB
EOT
ACK 0
ACK 1
ACK 0
ENQ
bid for line
EOT
ENQ
bid for line
(with three-second delay)
ENQ
bid for line
ACK 1
STX
text (odd)
ETX