Expand Configuration and Management Manual (G06.24+)

Subsystem Description
Expand Configuration and Management Manual—523347-008
18-66
Path Initialization
In Figure 18-20, a message is passed to the direct-connect line-handler process with
the multipacket frame feature selected. The direct-connect line-handler process still
fragments the message into six Expand packets but now constructs one large
multipacket frame to hold all six packets. If the entire multipacket frame fits inside one
HDLC-type frame, it is sent across the line in one frame.
When constructing a multipacket frame, an Expand line-handler process continues to
add packets to the multipacket frame until the frame can no longer accommodate
another full packet or until the current number of packets in the multipacket frame is
equal to 32.
Path Initialization
Before an Expand line-handler process at one end of a path will begin assembling
multipacket frames, the path must be initialized and the Expand line-handler processes
at both ends of the path must exchange maximum multipacket frame size information.
Individual packets are sent across the path until the path is initialized and the maximum
multipacket frame size is determined.
Multipacket frames are created from all available packets at the time the multipacket
frame is created—a timer is not used. As a result, no extra delays are incurred waiting
for additional packets.
Figure 18-20. Multipacket Frame Feature Selected
032CDT .CDD
Message
Direct-Connect
Expand Line-
Handler Process
1
2
3456
HDLC-Type
Frame
1
2
34 56
Multipacket
Frame