Chapter 3 System Features
AC 60 Software Features
3-36
255-700-025
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
traffic management to the OC-3c APS and the STIM-1 MSP modules. Phase 2
gives this capability to the Channelized DS3, DS1 and E1 modules.
One of the main improvements is upgraded usage parameter control (UPC).
This feature allows the end system to check the validity of the ATM
connection and protect it from malicious or unintentional misbehavior that
could affect the quality of service (QoS) of established connections. After a
set of service categories is specified, UPC is given a set of parameters for each,
describing the traffic presented to the network and the quality of service the
network requires. A number of traffic control mechanisms are defined,
which the network may use to meet the QoS objectives.
Switched Virtual Circuits
Switched virtual circuit (SVC) connections are used for voice traffic over a
public ATM WAN or private line network. SVCs are supported on all the ATM
cell-bearing interfaces, including the DS3, E3, OC-3c, STM-1, Multi-Serial,
and High Speed modules. The Access Concentrator system software supports
the following features:
•
Each ATM port on a single module can be individually configured for
ATM UNI 3.0, UNI 3.1, IISP user, IISP network, or PNNI interfaces.
•
SVCs can be allocated on UNI (public and private), IISP, and PNNI
interfaces.
•
Point-to-point and point-to-multipoint VCC connections are supported.
•
VCC connections support both symmetric and asymmetric bandwidth
requirements.
•
The Access Concentrator system can process 60 calls per second, 100
maximum UNIs per system, 5,000 maximum simultaneous point-to-
point SVC call originations, and 2,000 maximum point-to-multipoint call
originations.
•
The Access Concentrator system (equipped with 64 MB of memory on
the CPU module) can process 20,000 maximum simultaneous SVC calls
in progress.
•
The individual call setup time is 16 milliseconds (ms) maximum, while
the minimum call setup time for SVCs is approximately 10 ms from the
time the call setup message enters the CPU module, and the
acknowledgment leaves the CPU module.
Using the
PacketStar
™
Access Concentrator, you can make a maximum of
30,000 PVC connections per node, a maximum of 10,000 SVC point-to-point
connections per node, and a maximum of 6,000 SVC point-to-multipoint
connections per node.
Functional
Description
SVC signalling, per ATM Forum UNI 3.0 and UNI 3.1, is selectable on a per-
port basis. Call control is performed on the CPU module, including
management of the call-state transitions for each of the calls. This process
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