The Menu Interface (TSO/ISPF Panels) › Send MVS File To Another System Screen › Parameter Fields › Pack Data Records

Pack Data Records

This parameter field specifies whether the record packing is used on a file transfer.

NO

Specifies that no record packing is used. The data are sent unblocked.

LENGTH

Specifies that the records are packed into fixed‑size data transfer blocks. Each record begins with a 2‑byte long prefix that indicates the length of the record and determines how many records can be packed into a block. The default block size is 2 K but it can be increased to 31 K. Using the MAXPACK parameter in the CA XCOM Data Transport Default Options Table or in the CA XCOM Data Transport control library member.

When transferring a text file to a partner that supports record separators, record separators are inserted. No separators are inserted in binary files that are transferred with PACK=LENGTH.

CRLF

Specifies that the records are packed into blocks and separated using a C(carriage)R(return)L(ine)F(feed) byte sequence.

Notes:

• PACK=LENGTH with MAXPACK=31744 are selected when using CA XCOM Data Transport over TCP/IP. If PACK=LENGTH is coded, then also code RECSEP=NO.
• Platforms that understand PACK=LENGTH are IBM AS/400, UNIX-based systems, and z/OS systems. See the appropriate documentation for the platform to see if this value is supported.
• CRLF packing can be used with text files only. CRLF is also used when communicating with older releases of CA XCOM Data Transport on PC‑DOS and OS/2.
• PACK=LENGTH when specified with a MAXPACK value of 4096 or higher, enables compression processing to utilize zIIP processors, which helps reduce CPU utilization costs.