Expand Configuration and Management Manual (G06.24+)

Subsystem Description
Expand Configuration and Management Manual—523347-008
18-52
Sending and Receiving Data
correspond to an Expand modifier and can be changed only by using the SCF interface
to the Expand subsystem.)
Specifying the MAXRECONNECTS modifier enables you to limit the number of times
the Expand-over-NAM, Expand-over-ServerNet, or Expand-over-FOX line-handler
process will attempt a connect request. If you specify the MAXRECCONNECTS
modifier, you can also control what happens after the reconnect limit has been reached
by specifying the AFTERMAXRETRIES_PASSIVE or AFTERMAXRETRIES_DOWN
modifier.
Passive Connect Request
When the Expand-over-NAM, Expand-over-ServerNet, or Expand-over-FOX line-
handler process issues a passive connect request, the NAM waits for an incoming
connect request. You can cause the line-handler process to use the passive connect
method by specifying the CONNECTTYPE_PASSIVE modifier.
The passive connect request is successful when the NAM process receives a connect
request within a certain timeout period. Once the passive connect request is
successful, the Expand-over-NAM, Expand-over-ServerNet, or Expand-over-FOX line-
handler process can begin sending and receiving data over the connection.
If the connection request is not successful within the timeout period, the Expand-over-
NAM, Expand-over-ServerNet, or Expand-over-FOX line-handler process will continue
to issue passive connect requests at regular intervals until a connect request is
received.
The default connect timeout period is 60 seconds for Expand-over-ServerNet, 60
seconds for Expand-over-FOX, and 30 seconds for Expand-over-NAM line-handler
processes. You can control the connect timeout period with the Expand SCF
TIMERRECONNECT attribute. (The TIMERRECONNECT attribute does not
correspond to an Expand modifier and can be changed only by using the SCF interface
to the Expand subsystem.)
You can limit the number of times the Expand-over-NAM, Expand-over-ServerNet, or
Expand-over-FOX line-handler process will attempt a connect request by specifying
the MAXRECONNECTS modifier. If you specify MAXRECONNECTS, you can also
control what happens after the reconnect limit is reached by specifying the
AFTERMAXRETRIES_PASSIVE or AFTERMAXRETRIES_DOWN modifier.
Sending and Receiving Data
Specifying the TXWINDOW modifier enables you to control how many packets the
Expand-over-NAM, Expand-over-ServerNet, or Expand-over-FOX line-handler process
can send before receiving acknowledgment from the NAM process. You can also
control how many packets the NAM process can send to the Expand-over-NAM,
Expand-over-ServerNet, or Expand-over-FOX line-handler process before requiring
acknowledgment by specifying the RXWINDOW modifier.