Xerox 96MX - Manual (Page 438)

OFFLINE SPECIFICATIONS
D-8 XEROX DOCUPRINT 96/DOCUPRINT 96MX LPS PDL REFERENCE
Usage requirements
To input Interpress data through magnetic tape:
• The tape’s format must comply with the Xerox Magnetic Tape
Format Standard and the Xerox Simple Transport Protocol
Standard.
•
Interpress must be specified from magnetic tape in the job
START parameter. The START command has the following
fields:
START [ jde],[jdl],[S or M],[copies],[REPORTS:r
1
, r
2
,...]
,INTERPRESS
(Note that the keyword INTERPRESS must be included; fields
in brackets are optional.)
• Interpress must be specified in the job descriptor library (JDL)
by using the Print Description Language (PDL) parameter
command:
VOLUME INTERPRESS=YES.
•
The parameter to enable error checker for Interpress tapes is
provided, on a job basis, through the PDL parameter command:
VOLUME INTERPRESS=CHECKSUM (or NOCHECKSUM).
(Note that this software checking is in addition to any other error
checking mechanism supplied by the tape driver’s hardware.)
• An appropriate JDL must be set up so that the data extraction
processor can skip over the host-specific printer carriage
control bytes and other control bytes normally associated with
the line printer, record-orientated data. (Refer to the
Xerox LPS
Tape Formats Manual for details.)
Notes and restrictions:
• A logical block may not span a physical block, and a physical
block may not contain more than one logical block. A logical
block is defined as equivalent to one user data record. (Refer to
“Xerox Simplified Transport Protocol logical block” example
earlier in this appendix.)
• The data portion of the logical block is restricted to a minimum
length of 1024 bytes. The restrictions are placed to optimize
performance. The restriction on the maximum logical block
length is placed so the Interpress processing does not have a
degrading impact on the available user space in input. It is best
to create logical blocks of precisely 1040 bytes in length. This
block length is the sum of 16 XNS control bytes and 1024 data
bytes. When the length of the block is less than the minimum
physical block length, padding bytes of unspecified value are
appended to make up a physical block of the appropriate
length. These padding bytes are discarded by the recipient of
the system.
•
All routing packet information is ignored by the LPS.
• The job is aborted when the checksum verification is enabled
but fails.
•
The PDL parameter command, VOLUME PLABEL=YES or NO,
is not supported for Interpress tapes. This parameter specifies if
the tape labels are to be printed with the job.