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255-700-025
3-39
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
Chapter 3 System Features
AC 60 Software Features
The following state transition messages are used for ATM point-to-point call
and connection control:
•
The information elements used in the Call Establishment-Setup message
allow the user to request the called party number, specific PCR, SCR,
MBS, QoS class, forward and backward direction rates, performance,
congestion control parameters, and so on, from the Access Concentrator
UNI. The Call Establishment-Connect message allows the called party to
respond with available traffic parameters, such as PCR, SCR, MBS, QoS
class, forward and backward direction rates, performance, congestion
control parameters, and so on. Usually this message also indicates the
available VPI/VCI allocated for the connection. The other state-transition
messages are specified by the ATM Forum UNI 3.0 and UNI 3.1
specifications and are transparent to the user.
#10—Active
• User—For incoming calls, when the user has been
awarded the call. For outgoing calls, when the
user has received an indication that the remote
user has answered the call.
• Network—For incoming calls, when the network
has awarded the call to the called user. For outgo-
ing calls, when the network shows that the remote
user has answered the call.
#11—Release
request
• User—The user has requested that the network
clear the end-to-end connection and is waiting for
a response.
• Network—The network has requested a request
from the user to clear the end-to-end connection.
#12—Release indica-
tion
• User—The user has received an indication to dis-
connect because the network has disconnected the
end-to-end connection.
• Network—The network has disconnected the end-
to-end connection and has sent an indication to
disconnect the user-to-network connection.
Call establishment mes-
sages:
• Call proceeding
• Connect
• Connect acknowledgment
• Setup
Call clearing messages:
• Release
• Release complete
Miscellaneous messages:
• Status
• Status inquiry
Call States
Description
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