OSI/TS Configuration and Management Manual

NonStop Kernel File-System Interface
OSI/TS Configuration and Management Manual—424831-001
7-7
Preparing to Establish a Connection
The ISO standards do not include the concept of subdevices; subdevices are part
of the Compaq implementation of the ISO standards. However, since OSI/TS
uses subdevices to uniquely identify transport connections, it is helpful to think
of a transport connection as identical with the subdevice that provides its access;
in other words, a subdevice is a potential transport connection.
Subdevices are longer-lived than transport connections. After a connection is
released, the same subdevice can be used to create a new connection.
Throughout its history, a subdevice is likely to be used to establish and transfer
data on many different transport connections.
Preparing to Establish a Connection
Before your application can communicate across the OSI network, it must open a
subdevice and define some parameters. Use the following procedure calls:
Retransmission counter MAXREXMIT
Multiplexing MULTIPLEX SETPARAM
13
Network type NETTYPE
Outbound CR refused
configuration error
OUTBOUNDCRCONFERRTHLD
Outbound CR refused error
threshold
OUTBOUNDCRERRTHLD
Outbound TPDU refused
protocol error threshold
OUTBOUNDTPDUPROTOERRTHLD
Shared X25AM subdevices PASSIVEMUX
Received security parameters RECVSECURITY SETPARAM
12
Reference number timer REFTIMEOUT
Retransmission timer REXMITTIMEOUT
Transmitted security
parameters
SENDSECURITY SETPARAM
11
Transport-connection priority TCONPRI
TPDU size TPDUSIZE
Reassignment timer TTRTIMEOUT
Time to wait for CR-TPDU TWRTIMEOUT
Window information
retransmission timer
WINDOWTIMEOUT
Table 7-2. Setting SERVICE Parameters
SERVICE Parameter SCF Attribute
Procedure
Call