OSI/TS Management Programming Manual

ADD SU Command
Commands and Responses
056786 Tandem Computers Incorporated 5–21
3 0 or 1 or 2 or 3
4 0 or 1 or 2 or 3 or 4
The default value of this parameter is the value of the ZCLASS attribute.
ZTPDU-SIZE
specifies the maximum length of a transport protocol data unit (TPDU) in
bytes. Acceptable values are 128, 256, 512, 1024, 2048, 4096, and 8192 bytes.
The values 4096 and 8192 are valid only when ZCLASS is 1, 2, 3, or 4. For X.25
subnetworks: OSI/TS will adjust the value of ZTPDU-SIZE to not exceed the
value of the X25AM SYSGEN attribute MAXIOSIZE. Use the STATUS SU
command to determine the actual ZTPDU-SIZE used when the connection
was established. The default value is 512.
ZXSUM
specifies whether the checksum field is added to TPDUs. This parameter is
valid only if the preferred transport protocol class is 4. If set to ZSPI-VAL-
TRUE, the checksum field is added; if set to ZSPI-VAL-FALSE, the checksum
is not added. The default value is ZSPI-VAL-TRUE.
ZEXTENDED-FRMT
specifies whether the credit and sequence number of transport protocol data
units should be in the extended format. If the parameter value is ZSPI-VAL-
TRUE, extended format is used. If the parameter value is ZSPI-VAL-FALSE,
the normal format is used. This parameter is meaningful only for transport
protocol classes 2, 3, and 4. The default value is ZSPI-VAL-FALSE.
ZMULTIPLEX
specifies whether more than one outgoing transport connection is mapped to
one network connection (ZSPI-VAL-TRUE) or not (ZSPI-VAL-FALSE). The
default value is ZSPI-VAL-FALSE. To be able to multiplex, two or more
subdevices must have ZMULTIPLEX ON (ZSPI-VAL-TRUE) and have the
same local and remote NSAPs. If these conditions are met, the maximum
number of outgoing transport connections that are multiplexed together is
determined by the value of the Layer 3 service attribute ZX25NCON-
MULTIPLEX, described under the ALTER SERVICE command. This attribute
is valid only when ZCLASS is ZOS4-VAL-CLASS-2, ZOS4-VAL-CLASS-3, or
ZOS4-VAL-CLASS-4. This attribute is used only for outgoing connections on
X.25 networks.
ZEXPEDITED
specifies whether the transport expedited data transfer service is supported.
This has meaning only for transport protocol classes 1, 2, 3, and 4. The default
value is ZSPI-VAL-FALSE.