Fabric Access Processor - FAP10/20V
System Configurations and Applications
The FAP10/20V can be used:
• As a 10G/20Gbps stand-alone ingress/egress
• In mesh configurations of FAP10/20V devices
• In switch-based systems that can grow as large
The versatility of the FAP10/20V devices enables a
vendor to design a full product line using the same
chipset, sharing the same line and fabric cards. For
example, for low-capacity platforms, the fabric-less
(mesh) FAP configurations may be used, while the
higher-capacity platforms may use the same line
cards connected via fabric cards.
The FAP10V and FAP20V are full-duplex 10G and
20G devices tailored to the needs of the Metro
Ethernet market, fully supporting relevant traffic
management standards (IETF, DSL Forum, ITU, MEF),
and enabling flow-based hierarchical traffic
management. The FAP10V and FAP20V devices
combine the functionality of a traditional stand-alone
traffic manager and a Fabric Interface Device. In a
system they implement a distributed traffic
management architecture which can scale while
maintaining functionality and performance.
In a stand-alone mode, a FAP10/20V device provides
comprehensive local traffic management services,
such as deep buffering, congestion avoidance via
WRED, fine-grained weight and rate-based flow
shaping and hierarchical scheduling toward the
A switched configuration constructed by several
FAP10/20V devices connected via their fabric interface,
enables for the first time end-to-end rate and weight
guarantees of traffic flows across a complete system.
In such a configuration a FAP10/20V device performs
ingress and egress functions (scheduling and routing)
to and from the switching fabric, in addition to
providing complete traffic management functionality
(shaping and queuing).
The SAND fabric implements carrier-class reliability,
and incorporates failover mechanisms in hardware,
which enable the creation of systems with various
levels of fault-tolerance. Examples of systems that
can be built include N+M, N-M and 1:1.
A FAP10/20V device automatically detects and re-
routes around faulty links or elements, resulting in
fault-tolerant, self-healing fabrics.
Through its CPU interface, one can configure the
FAP10/20V device, access its counters and internal
memories, and send and receive data and control cells.
The CPU interface may also be used to communicate
in-band with other CPUs in the system, monitor traffic,
gather statistics, and generate error logs.
The FE200 and the FAP family of devices are backed
by a full support package. The hardware development
kit includes full guidelines with schematics and
layout databases. The software development kit
includes device drivers, source code and
documentation. Two reference designs are available,
providing a complete hardware & software
development environment for SAND-based products.
In a switched configuration, a FAP20V consumes less
than 12W and the FAP10V less than 9W. The power
consumption is further reduced when the devices
are used as stand-alone traffic managers.
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