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255-700-025
3-19
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
Chapter 3 System Features
AC 60 Software Features
buffers. The execution of this algorithm is based on the priority levels
the user selects.
•
Cell aging
This capability prevents the lowest-priority data (for example, IP data) from
being buffered in the Access Concentrator systems indefinitely.
AQueMan™
keeps track of how long each cell stays in the buffer. The lower the priority of
the traffic, the longer its cell-aging time; that is, UBR traffic has a longer cell-
aging period than VBR-RT traffic. This capability allows the Access
Concentrator systems to periodically send low-priority cells through the
network. Doing so prevents retransmission of IP data traffic while increasing
the time-out window for the TCP/IP sessions. The cell-aging mechanism
allows for orderly decongestion of the network without resorting to traffic
rerouting and other complicated protocols and procedures.
Connection Gateway API
The Connection Gateway Application Programming Interface (API) provides
an interface to the AC 60 by which an external workstation (gateway) can
control AC 60 ATM switching using nonnative ATM networking protocols.
The Connection Gateway Application Programming Interface (API) was
initially used only in custom releases, to work with
PacketStar
™
central office
products, such as the PSAX 1250 and the PSAX 2300. Software Release 5.1
fully integrated the Connection Gateway API with the
PacketStar
™
line.
Using this interface, an external workstation can control ATM switching in a
PSAX 1250 or PSAX 2300 using non-native ATM networking protocols. The
connection gateway allows powerful interworking of ATM, ISDN, SS7, CAS,
and other protocols.
In Release 6.3.0, these capabilities have been improved to support such new
features as Type 102, Type 105, and Type 108 milliwatt termination tests on
the Tones and Announcements Server module, CAS signaling, and extending
existing Connection Gateway API functionality to new PSAX hardware and
software components such as the Medium-Density DS1 and DSP2C Voice
Server modules.
See the
PacketStar™ Connection Gateway Application Programming Interface
Developer’s Guide
for detailed information about implementing a connection
gateway API.
Console Help
As new features have been added to enhance the
PacketStar
™
line of Access
Concentrators, the console help files have been updated. They now offer
meaningful, helpful advice to users who need assistance in implementing
both the new and existing features. Advice offered for many other fields has
been totally rewritten, often in response to advice from customers. Where
possible, our guidelines point to the information base in the appropriate
PacketStar
™
Installation and Operation Guide, User Guide, and Module User Guide
.
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