
Chapter 3 System Features
Multiservice Media Gateway Software Features
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255-700-239
PacketStar
®
PSAX 4500 Multiservice Media Gateway User Guide
, Issue 2
Release 8.0.0
This feature supports packet switched wireless backhaul networks for inter-
connecting Lucent MSCs and Series II base stations using the Lucent propri-
etary packet pipe protocol over land lines. This protocol performs encapsula-
tion within ATM AAL2 for various cell site sizes.
Reduction in Post-Dial Delay
Event handling processes within the PSAX system were improved so that the
amount of time needed to set up an SVC connection for a call is reduced.
Within the PSAX system, call setup time is now 30 msec or less.
Trap Descriptions
The PSAX system provides the capability to display SNMP trap messages on
the console interface and on the
AQueView
Element Management System.
The trap message log is 64 KB in size and can hold up to 1,040 trap messages.
If the trap log is full, the PSAX system dumps trap messages on a FIFO (first
in, first out) basis. External SNMP managers can perform various functions in
the PSAX system, and also receive trap and notification messages. The SNMP
trap message log provides the following functions on the console interface
and the
AQueView
EMS:
•
Searching for all instances of a specific character string in the log
•
Viewing detailed information, the trap message help, for one or more trap
messages
The procedure to access the console interface Trap Log Display window and
decriptions of the SNMP trap messages are provided in Appendix A, “SNMP
Trap Messages.”
Traffic Management Using the AQueMan Algorithm
With ATM, predictable quality of service (QoS) is achieved for all applications
by transmitting voice, video, and data using short, fixed-length cells inter-
leaved at guaranteed bit rates. The guaranteed bit rates are implemented by
assigning ATM Forum-established QoS classes for each type of data to be
transferred. The following attributes are considered in assigning an ATM ser-
vice class:
•
Cell transfer delay characteristics
•
Cell loss ratio
•
The type of connection required
•
The timing or synchronization of the source and destination
The AQueMan algorithm manages traffic while supporting ATM Forum
classes of service. This adaptive algorithm allocates bandwidth by statistically
multiplexing traffic within two sets of queues according to weighted priori-
ties. One set of queues addresses avoidance of cell loss, which is normally a
concern for data traffic, while the other manages cell transfer delay, which is
critical to voice and some video traffic.
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