.-COMPRES--=--SYSTEM-----. >>-+------------------------+---------------------------------->< | .-SYSTEM-. | '-COMPRES--=--+--------+-' +-PROHIB-+ '-REQD---'
| macroinstructions: | MODEENT |
| dependencies: | none |
Specifies how the negotiation of data compression usage
should be handled. This operand allows data-compression override
specifications to be associated with a logon mode name. The SLU sends
this information to the PLU to indicate what level of data compression
it wants before the PLU sends the BIND.
- COMPRES=PROHIB
- Specifies that override data should explicitly prevent the use of data compression for sessions using this logon mode.
- COMPRES=REQD
- Specifies that override data should explicitly request data compression,
regardless of link characteristics along the path, for sessions using
this logon mode, if both session partners can compress data. REQD causes compression to be specified only when you specify one of the following items:
- The CMPVTAM start option is not set to 0
- One of the following items is not set to 0 on the APPL definition
statement:
- The CMPAPPLI operand
- the CMPAPPLO operand
- Both the CMPAPPLI operand and the CMPAPPLO operand
If your application is the SLU and you want to use compression, code REQD.
- COMPRES=SYSTEM
- Specifies that no override is needed. For sessions using this logon mode, normal BIND negotiation logic determines whether data compression is used. The default system compression for VTAM® application programs when VTAM acts as the SLU is no compression.