Exchange/RJE Manual

Unanswered Line Bid
BSC Line Control
C–8 104698 Tandem Computers Incorporated
Unanswered Line Bid This figure shows the BSC line-control sequence where a bid for the line is not
answered.
Transmitting Station Receiving Station
ENQ
bid for line
(one- or three-second delay timeout)
ENQ
bid for line
(one- or three-second delay timeout)
ENQ
bid for line
(one- or three-second delay timeout)
EOT
003
Retransmission Accepted
(Terminal-to-Terminal)
This figure shows the BSC line-control sequence between two terminals during a
transmission where the retransmission is accepted.
004
Transmitting Station Receiving Station
ENQ
bid for line
STX
text (odd)
ETB
STX
text (odd)
ETB
STX
text (even)
ETB
EOT
ACK 0
NAK
ACK 1
ACK 0