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Method for Transmitting Standard Labeled Tapes between Computer Systems

IP.com Disclosure Number: IPCOM000111654D
Original Publication Date: 1994-Mar-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Clark, WD: AUTHOR

Abstract

A method of transmitting Standard Labeled Tapes from one computer system to another computer system in an SNA communications network is described. The information transmitted includes the data on the tapes and the control information necessary for the receiving system to re-create the tapes.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Method for Transmitting Standard Labeled Tapes between Computer Systems

      A method of transmitting Standard Labeled Tapes from one
computer system to another computer system in an SNA communications
network is described.  The information transmitted includes the data
on the tapes and the control information necessary for the receiving
system to re-create the tapes.

      APAR data is usually transmitted in the form of Standard
Labeled Tapes.  The functions performed are 'sending' or 'receiving'
a tape.  The following are the operations performed by the sending
program.  It is easiest to described it in two parts.

      In the first part, the tape is read into a tape image file.
The tape is read and the Volume Header information, File Header
information and the actual data records contained on the tape are
packed into a data file on the computer system.  This data file is
the tape image file.  There is no relationship between the record
length of the tape image file and tape record lengths.  The tape
image data file has a fixed record length chosen by the user and can
vary from 512 to 32766 bytes.  The data is stored in the tape image
physical records as variable length logical records in a blocked and
spanned fashion.  The logical records have the following format.

   Id byte - This defines whether the file contains data, control
             or header information.

   Flag - Used to handle spanned record.

   Length - Two bytes integer value of the length of data following.

   Data - The actual data, control or header information.

The tape image file now contains all information required to
re-create the tape.

      In the second part, the tape image file is split into multi...