Expand Configuration and Management Manual (G06.24+)

Subsystem Description
Expand Configuration and Management Manual—523347-008
18-21
Layer 4 Send Window
Node \A looks for responses to send to node \B and sends LCMP sequence number 0.
This LCMP is a response to a prior request from node \B. When node \B acknowledges
the LCMP with ACK sequence number 1, it deallocates its buffer and releases
sufficient resources to receive node \A’s LRQ. Node \A resends its initial LRQ (which is
now assigned LRQ sequence number 1) along with two more LRQs. Node \B
acknowledges all three LRQs with ACK sequence number 4 and then responds with
three LCMPs. Node \A acknowledges node \B’s LCMPs with ACK sequence number 3.
Layer 4 Send Window
The size of the Layer 4 send window determines how many packets are sent before an
acknowledgment is required. The default value for the Layer 4 send window is 254,
allowing as many as 254 unacknowledged outstanding packets in any single end-to-
end connection.
Note. You can alter the size of the Layer 4 send window with the L4SENDWINDOW modifier.
This modifier is explained in Section 17, Expand Modifiers
.