Exchange/RJE Manual

Transmission Error, Block Ignored by Receiving Station
BSC Line Control
C–14 104698 Tandem Computers Incorporated
Transmission Error, Block
Ignored by Receiving
Station
This figure shows the BSC line-control sequence between two stations during a
transmission where there is an error because the transmitted block is ignored by the
receiving station. The ignored block causes the transmission to time out. The
transmitting station bids again for the line; the second time, the transmission is
successful.
010
Transmitting Station Receiving Station
ENQ
bid for line
STX
text (odd)
ETB
STX
text (even)
ETB
ACK 0
ACK 1
EOT
ACK 1
No Response
(wait for response,
three-second timeout)
ENQ
STX
text (even)
ETB
ACK 1
ACK 0
STX
text (odd)
ETX