.-CHANCON--=--COND-------. >>-+------------------------+---------------------------------->< | .-COND---. | '-CHANCON--=--+--------+-' '-UNCOND-'
| statements: | PCCU |
| dependencies: | none |
Determines
whether VTAM® sends a conditional
or an unconditional channel contact request to the NCP when the host
is to activate the NCP over a channel.
- CHANCON=COND
- VTAM allows the NCP to reject the host's contact request, if the host’s subarea number is already in use by another host (attached to another one of the NCP's channels). This results if duplicate subareas are assigned to more than one host (attached to more than one channel interface). Two hosts might have inadvertently been assigned the same number, or they might have been assigned duplicate numbers to allow mutual backup capabilities.
- CHANCON=UNCOND
- The contact request is unconditional; the NCP must accept it. If another host is using the same subarea number, the NCP breaks contact with that host.
Note: If you plan to define the channel to the NCP in a
channel-attachment major node, this operand is replaced by the CHANCON
operand on the PU definition statement for the channel-attachment
major node. See CHANCON for a description
of the CHANCON operand in a channel-attachment major node.