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255-700-025
3-13
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
Chapter 3 System Features
AC 60 Software Features
PSAX 1250, PSAX 20, AC 60 and AC 30, and Release 6.0 software for all
models but the PSAX 2300 system. (The PSAX 2300 system was first
introduced with PSAX Release 6.1.0 system software.)
Note:
The AC 30 system is only supported for PSAX system software
releases prior to Release 6.3.0.
AC 60 Software Features
The Access Concentrator system software uses permanent virtual circuits
(PVCs) and switched virtual circuits (SVCs) to provide end-to-end
connectivity for transmission in a network. Because virtual connections are
logical and not physical, multiple connections can be defined simultaneously
across a single network facility, with each connection having flexible
bandwidth.
Because PVCs establish end-to-end connectivity, a PVC eliminates the need
for establishing a new route (call setup) each time a transmission is sent to a
remote location. When establishing a connection with a PVC, the user simply
selects a class of service for each connection.
The Access Concentrator system also features cell-counting capabilities that
allow network data collection systems to generate usage-based billing
reports. The
AQueMan™
algorithm maximizes bandwidth efficiency while
ensuring QoS on a congested network; and LANET, a physical layer protocol,
efficiently adapts ATM to high-noise wireless and satellite environments.
Alternate Rerouting Using Dual-Homed PVCs
Overview
To protect ATM traffic from network outages, the Access Concentrator
system can detect alarms or failures on an ATM backbone and reroute PVC
traffic around the affected portions of the network. The system performs the
rerouting function independently, without relying on operator intervention
or rerouting capabilities within the network itself. This implementation
allows for dual-homed PVCs (DHPVCs) to be established for ATM-to-ATM
connections, circuit emulation-to-ATM connections, frame relay-to-ATM
connections, bridge-to-ATM connections, and terminal emulation-to-ATM
connections. DHPVCs for virtual paths can only be implemented on ATM-to-
ATM connections. Alternate rerouting is a standard feature of the system
software. The system sets up DHPVCs according to an industry-standard
technique.
It is not necessary to designate an interface to perform solely as the "standby"
for DHPVCs. Rather, ATM trunk interfaces can be used in a load-sharing
design with the connection admission control (CAC) constraints
automatically considered as the DHPVC is established. This allows particular
links to be used as the primary link for certain DHPVCs, while they are used
simultaneously as the standby for other DHPVCs.
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