Exchange/SNA Manual

DOWN Command
Exchange/SNA Commands
104700 Tandem Computers Incorporated 3–13
Considerations The DOWN command takes the specified subdevices out of service. After a subdevice
has been taken out of service, that subdevice cannot be used by any process, including
other Exchange/SNA command interpreters, until it is put back in service with the UP
command. See the UP command, later in this section, for more information.
To use the DOWN command, the command interpreter must be privileged with
respect to the line server (that is, the command interpreter must have the same
accessor (user) ID as the command interpreter that started the line server). If the
command interpreter is not privileged with respect to the line server, the DOWN
command fails and no subdevices are taken out of service.
The DOWN Command With the Exclamation Point (DOWN !)
If you use the DOWN command with the exclamation point, any send and receive
operations in progress on the specified subdevices are aborted and the subdevices are
taken out of service immediately, even if the send and receive operations were started
by another Exchange/SNA command interpreter (or any other process). The DOWN
command takes a subdevice out of service regardless of what other process is using
that subdevice.
The DOWN Command Without the Exclamation Point (DOWN)
If you use the DOWN command without the exclamation point, the command waits
for any operations in progress to complete before taking the specified subdevice out of
service. No new operations can be started on a subdevice specified in the DOWN
command; the subdevice is taken out of service as soon as the current operation has
completed.