z/OS Communications Server: SNA Customization
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Connection status vector (X'03')

z/OS Communications Server: SNA Customization
SC27-3666-00

VTAM® calls the exit with the connection status vector whenever the connection status of a switched PU changes. You can use this vector to record the connection and disconnection times of switched devices. VTAM does not expect the exit to return any information other than a return code.
Table 1. Connection status format

Dec (Hex)
offset

Size
(Bytes)

 
Description

0 (0) 1 Bit Setting
B'1... ....'
If this bit is on, the device named in the vector is connecting to the network.
B'.1.. ....'
If this bit is on, the device named in the vector is disconnecting from the network.

The remaining bits are reserved.

1 (1) 8 This field contains one of the following:
  • The name of the switched line to which the PU is, or was, connected
  • For DLUS connections, the name of the DLUR that supports this PU.
9 (9) 8 This field contains the name of the PU whose status changed.
17 (11) 8 This field contains the time stamp that tells when the PU's status changed. The time stamp is retrieved from the system time-of-day clock.
25 (19) 8 This field contains the station ID of the PU, if available.
33 (21) 8 This field contains the CP name of the PU, if available.

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