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4-24 Message structure and function
An end user who is notified that the network or far end user is congested
only receives one Congestion Control message with an indication of
"Receive Not Ready" and an optional Cause parameter. Once a user
receives a Congestion Control message for that user must have an indication
of "Receiver Not Ready," the next Congestion Control message for that user
must have an indication of "Receiver Ready" with the optional Cause
parameter identical to the one received in the Congestion Control message
with an indication of "Receiver Not Ready".
If the access DMS-250 goes into "network congestion" due to congestion
flow control, the DMS-250 will send its access user a Congestion Control
message with an indication of "Receiver Not Ready." If the far end user is
congested, it sends a Congestion Control message with an indication of
"Receiver Not Ready." The network forwards this user generated
Congestion Control message across the network until it reaches the access
switch that sent the first Congestion Control message with an indication of
"Receiver Not Ready". If the access switch is still congested, the access
switch cannot forward the user generated Congestion Control message to the
near end user.
Conversely, an end user can only be notified of congestion clearing when the
network and the far end user are ready to receive User Information
messages. The end user can only receive one Congestion Control message
with an indication of "Receiver Ready." Once a user receives a Congestion
Control message with an indication "Receiver Ready", the next Congestion
Control message for that user must have an indication of "Receiver Not
Ready."
For example, if the access switch is in congestion and the far end user
congestion clears, the far end user can send a Congestion Control message
with an indication of "Receiver Ready." The network forwards the user
generated Congestion Control message across the network until it reaches
the access switch. The user generated Congestion Control message cannot be
forwarded to the near end user because the access switch is still in
congestion.
297-2521-106 Standard 23.01 March 2001
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