InfoPrint 6500 Series User Manual page 138

Chapter 8
Configuring PSF for z/OS to Print IPDS Files
DATABUFFERPOOLSIZE
The DATABUFFERPOOLSIZE statement defines the number and size of the
data buffers. For printing on TCP/IP-attached printers, InfoPrint recommends
that you specify at least 160 data buffers, 32768 buffer size.
SMALLDATABUFFERPOOLSIZE
The SMALLDATABUFFERPOOLSIZE statement defines the number of small
data buffers. For printing on TCP/IP-attached printers, InfoPrint recommends
that you specify at least 256 small data buffers.
TINYDATABUFFERPOOLSIZE
The TINYDATABUFFERPOOLSIZE statement defines the number of tiny
data buffers. For printing on TCP/IP-attached printers, InfoPrint recommends
that you specify at least 256 tiny data buffers.
KEEPALIVEOPTIONS
PSF relies on TCP to detect when a connection with a TCP/IP-attached
printer is no longer usable. When no data has been exchanged between PSF
and its connection partner, TCP sends keep-alive probes to the connection
partner periodically. These periodic probes, called keep-alive transmissions,
enable TCP to discover when a connection is no longer usable even if the
connection partner is abruptly powered off or is no longer accessible through
the network.
The frequency of keep-alive transmissions is controlled by the INTERVAL
parameter on the KEEPALIVEOPTIONS statement. The frequency applies to
all TCP applications that direct TCP to send keep-alive transmissions. The
default frequency is after about two hours of inactivity.
For printing on TCP/IP-attached printers, InfoPrint recommends that you
specify a shorter interval than the default, such as 10 minutes, for the interval
between keep-alive transmissions.
Also, if any target host requires that the keep-alive packet contain data,
specify SENDGARBAGE TRUE. For example:
KEEPALIVEOPTIONS INTERVAL 5 SENDGARBAGE TRUE
ENDKEEPALIVEOPTIONS
GATEWAY
The Packet Size parameter of the GATEWAY statement defines the
maximum transmission unit (MTU) for the z/OS host. For 10/100Base-T
ethernet printers, the MTU size is fixed at 1024 bytes. The value cannot be
adjusted.
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