CP6100 I/O Process Programming Manual

Using CP6100: Managing Lines
For BSC only:
BSCBAUD1200, BSCBAUD1800...BSCBAUD19200. These parameters apply
only to the BSC protocol, and only in those cases where the
LIU provides the transmit clock. (See the discussion of
| BSCINTERNALCLK in the System Management Manual for Tandem NonStop
Systems.) The baud rate setting determines the data rate of the
line, which is one of the primary factors determining its
throughput.
BSCITBSIZE. This parameter prescribes the size of a block for
the BSC protocol. A very small block size increases the
proportion of control to application data on the line, because
blocking inserts extra characters into the data stream.
BSCREADTO. This parameter specifies how long the protocol waits
on a read operation before deciding the expected block is never
going to arrive. Using an unreasonably short duration can cause
unnecessary error messages; using an unreasonably long duration
can hurt performance.
BSCRETRIES. This parameter specifies how many times the protocol
tries an operation before reporting an error to the application.
If the value is too high, the protocol wastes time in retries; if
too low, it reduces the number of requests successfully
completed.
October 1985
3-34