DISCNT


   .-DISCNT--=--(--NO--)--------------------.   
>>-+----------------------------------------+------------------><
   |            .-(--NO--)----------------. |   
   '-DISCNT--=--+-| DISCNT values |-------+-'   
                '-| DISCNT DELAY values |-'     

DISCNT values

           .-,--F--.      
|--(--YES--+-------+--)-----------------------------------------|
           '-,--NF-'      

DISCNT DELAY values

             .-,--F--.                         
|--(--DELAY--+-------+--+---------------+--)--------------------|
             +-,--NF-+  '-,--delay_time-'      
             '-,-----'

statements:

GROUP, PU

dependencies:

PUTYPE=2

Specifies when VTAM® should terminate its SSCP-LU and SSCP-PU sessions and, when DISCNT=YES or DISCNT=DELAY, whether to indicate "final-use" status in the DACTPU request unit when it deactivates a PU

DISCNT=(YES)

DISCNT=(NO)

Specifies whether VTAM physically disconnects the PU when the last LU ends its session with its application program (that is, when there are no more LU-LU sessions).

For a PU on a switched link, disconnection means that the dial connection is broken (in effect, the telephone is hung up, to save telephone charges) and the SSCP-PU session is terminated. Disconnection on a switched link does not involve deactivating the PU or its LUs (that is, sessions can be requested with those LUs causing the physical connection to be re-established).

See z/OS Communications Server: SNA Network Implementation Guide for more information about disconnection.

DISCNT=(YES,F)

DISCNT=(YES,NF)

Specifies whether VTAM indicates "final-use" status in the DACTPU request unit when it deactivates a physical unit as a result of DISCNT=YES. This value does not apply when DISCNT=NO, nor does it have any effect on the VARY INACT command.

If you code F or use the default, "final-use" status is indicated and the connection can be ended. If you code NF, "not-final-use" status is indicated and the connection should not be ended.

Each device has its own requirements regarding "final-use" status. To determine whether to code F or NF for a given device, consult the appropriate installation publication for the device.

DISCNT=(DELAY,F,delay_time)

DISCNT=(DELAY,NF,delay_time)

DISCNT=(DELAY,,delay_time)

Specifies that VTAM disconnects the physical unit if no LU-LU sessions exist after the value specified for delay_time expires. If delay_time is not specified, the current value for the DISCNTIM start option is used. delay_time specifies the number of seconds that VTAM delays disconnecting this PU if no LU-LU sessions exist. A decimal value in the range 5–65535 is valid.

The character value IMMED may be coded for delay_time to allow an immediate disconnect.

Note: A delay time value can also be assigned for this PU through the MODIFY DEFAULTS operator command.

For HPR Sessions: If this VTAM is a node in a High-Performance Routing (HPR) route and is connected to an IBM® 37xx Communication Controller, an Open Systems Adapter or through an IP network using Enterprise Extender, NCP or VTAM monitors the session traffic on the link to determine whether to deactivate a PU. When DISCNT=(DELAY,,delay_time), NCP or VTAM disconnects the PU if no session traffic has occurred during the time interval specified by delay_time. When DISCNT=(DELAY) or DISCNT=(YES), NCP or VTAM disconnects the PU if no session traffic has occurred during the time interval specified on the DISCNTIM start option.