Exchange/RJE Manual

Failure at Transmitting Station
BSC Line Control
104698 Tandem Computers Incorporated C–17
Data Link Stalemate (No
Continuation by
Transmitter)
This figure shows the BSC line-control sequence between two stations during a
transmission where the transmitting station unexpectedly does not continue the
transmission. If Auto Answer is installed on the receiving station, it will disconnect
the line after 20 seconds.
Transmitting Station Receiving Station
ENQ
bid for line
STX
text (odd)
ETB
013
ACK 0
ACK 1
(Transmitter Hung)
(Receiver waits for continuation; if
Auto Answer is installed, line
disconnects after 20 seconds)
Failure at Transmitting
Station
This figure shows the BSC line-control sequence between two stations during a
transmission where the transmitting station discovers an error and aborts the
transmission.
014
Transmitting Station Receiving Station
ENQ
bid for line
STX
text (odd)
(Failure Detected)
ENQ
EOT
ACK 0
NAK