255-700-025
3-27
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
Chapter 3 System Features
AC 60 Software Features
address within the same 10-nibble header space of standard ATM cells. In
addition, it avoids the extra delay (detrimental to CBR traffic) required of
multiple header-encoding schemes. In practice, to tolerate 2-bit random
errors or 5-bit burst errors will require setting up 526 addresses per each
channel. This is not a serious constraint because high-noise and low-speed
links will likely be used to support only a small number of users.
Finally, given the ability to deliver cells, the payload can now be FEC-
protected on a per-virtual-circuit basis depending on the error tolerance of
the application at the service-specific convergence sublayer (SSCS).
Figure 3-7 shows the LANET frame structure.
The LANET subframe functions in the following ways:
•
The timely arrival of the header patterns is used as a confidence check,
confirming that the system is properly synchronized.
•
In the event of synchronization loss, a state machine can easily seek and
resynchronize to the regular appearance of the simple header patterns.
Operations, Administration, and Maintenance (OAM)
Overview
The Operations, Administration, and Maintenance (OAM) feature on the
PSAX 2300 and PSAX 1250 chassis detects and reports on abnormal behavior
in virtual path connections (VPC) and virtual channel connections (VCC) in
the ATM and physical layers associated with an ATM network. OAM affects
the system software and I/O module firmware associated with generating,
Figure 3-7. LANET Frame Structure
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