- The 3741 accepts record formats of fixed (F), fixed blocked (FB), variable
(V), or variable blocked (VB). JES3, however, transmits only F or FB record
formats to the 3741.
- Each logical record that JES3 transmits to a 3741 is 128 bytes long. If
the 3741 has the expanded communication feature, each physical record that
JES3 transmits to the 3741 contains four 128-byte logical records. Otherwise,
each physical record contains one 128-byte logical record.
- Because JES3 always transmits a 128-byte logical record to the 3741, do
not use data compression. If you use data compression and JES3 compresses
a record to fewer than 128 bytes, JES3 will then pad that same record to 128
bytes. Therefore, data compression serves no useful purpose on a 3741.
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z/OS JES3 Initialization and Tuning Reference
Copyright IBM Corporation 1990, 2014