Expand Configuration and Management Manual (G06.24+)

Subsystem Description
Expand Configuration and Management Manual—523347-008
18-62
Sending and Receiving Data
attribute does not correspond to an Expand modifier and can therefore be changed
only by using the SCF interface to the Expand subsystem.)
You can limit the number of times the Expand-over-ATM line-handler process will send
a Connect Command frame by specifying the MAXRECONNECTS modifier. If you
specify MAXRECONNECTS, you can also control what happens after the reconnect
limit has been reached by specifying the AFTERMAXRETRIES_PASSIVE or
AFTERMAXRETRIES_DOWN modifier.
Sending and Receiving Data
Once a connection has been established, the local and remote Expand-over-ATM line-
handler processes communicate through their associated ATM lines using the QIO
mechanism. You can control how many packets the Expand-over-ATM line-handler
process can send to the ATM line before waiting for a reply by specifying the
TXWINDOW modifier.
To detect loss of connection through the ATM network, the Expand-over-ATM line-
handler process sends a Probe message to the remote Expand-over-ATM line-handler
process at periodic intervals of inactivity.
If the Expand-over-ATM line-handler process does not receive a response to its Probe
message, it will consider the line down after exceeding the maximum number of Probe
message retries.
The default inactivity interval (the amount of time the Expand-over-ATM line-handler
process will wait before sending a Probe message to the remote Expand-over-ATM
line-handler process) is 60 seconds. You can alter the inactivity interval with the
Expand SCF TIMERPROBE attribute.
The default number of Probe messages retries is 3. You can control the number of
times the Expand-over-ATM line-handler process will retry Probe messages with the
Expand SCF RETRYPROBE attribute.
Note. The RXWINDOW modifier is meaningless for Expand-over-ATM connections but is
provided to maintain commonality among the different line types. Because the Expand-over-
ATM line-handler process uses QIO to communicate with the ATM line, the Expand-over-ATM
line-handler process must read all the messages on its receive queue at one time; it cannot
limit the number of messages read to the RXWINDOW modifier value because of QIO
limitations.