SNAX/XF and SNAX/APN Configuration and Management Manual

Attributes for SNAX/XF and SNAX/APN
SNAX/XF and SNAX/APN Configuration and Management Manual—425836-006
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WINDOW
These integer values are specified following the number 13 and a comma and
surrounded by parentheses such as TYPE (13, 2). The number 13 is the PU device
type.
WINDOW
WINDOW specifies the maximum number of SDLC I-frames that SNAX can send to or
receive from a remote station before SNAX must receive (or send) an acknowledgment
of their error-free receipt. If associated with a line, the value specified applies to all PUs
on the line.
This attribute does not apply to X.25, Token-Ring, or Ethernet lines. The window on
Token-Ring and Ethernet lines is controlled by the LNMAXOUT, LNMAXIN, and
LNMAXOUTINCR attributes.
When the WINDOW attribute is specified for a secondary line, its value must equal the
value specified for MAXOUT in the PU definition statement of the IBM NCP system
generation.
When the WINDOW attribute is specified for a primary line, specify a value of 7 unless
the remote station places a restriction on this value because of hardware
considerations. For instance, the IBM 3767 requires that the value of the WINDOW
attribute be 1.
The line-handler process also uses the value of the WINDOW attribute to determine
the number of input path information unit (PIU) buffers that it must allocate in the
extended data segment (IOSEG).
If a WINDOW value is not specified for a PU, the default value is the value for the line
to which the PU is subordinate. Note that with line type 58,5 (SDLC), the value
specified for the line must be used; a WINDOW value cannot be specified for an
individual PU.
When you specify WINDOW in an ADD LINE or ALTER LINE command, you should
specify IOPAGES as 0 in the same command; an appropriate value for IOPAGES is
then automatically calculated. If you do not specify IOPAGES, the line handler retains
the value established for IOPAGES in previous ADD or ALTER commands. If you
specify IOPAGES with a value other than 0, the line handler sets IOPAGES to the
specified value. In either case, the value might not provide enough memory to
accommodate the new WINDOW specification, causing the SCF command to be
rejected.
Default: 7
Value: 1 - 7
Objects: LINE, PU