CX27470 Datasheet, PDF (1/4 Pages) List of Unclassifed Manufacturers – PortMakerII AAL5 Firmware

PortMakerII AAL5 Firmware
C X 2 74 7 0 Traffic Stream Processor
OC-12 Adaptation Layer 5 SAR
PortMakerII firmware provides proven, reliable and fully
supported binary applications for the CX27470 Traffic
Stream Processor. The ATM adaptation layer 5 (AAL5)
application provides a bi-directional OC-12 throughput
ITU I.363.5 SAR, traffic shaping and a rich feature set.
The firmware is also available with a source code license
to allow customization and product differentiation.
AAL5 Segmentation and Reassembly (SAR)
The PortMakerII AAL5 firmware application complies with
the ITU I.363.5 standard, and also conforms to the ATM
Forum PICS Proforma for the AAL Type 5 tests. The
firmware provides OC-12 throughput with 32K connections
in bi-directional mode. It can also be configured in a
uni-directional configuration (i.e., two chip solution) with
2xOC-12 throughput and 64K connections. ATM cell traffic
uses the UTOPIA interface on the CX27470, while packet
traffic can use either the UTOPIA/POS interface for
streaming mode operation, or the PCI bus for shared
memory operation. Host based management of the
SAR is accomplished via the PCI bus using commands,
acknowledgements, indications, and alarms.
> KEY FEATURES
> Bi-directional OC-12
throughput
> Encapsulation/
De-encapsulation
>∑ITU I.363.5 compliant AAL5 SAR > Reassembly time-out
> ATM Forum TM 4.1 traffic
shaping
> Per VC queuing
> Support for raw cells (AAL0)
> Per PHY and per connection
statistics
> Choice of segmenter queue
admission policies:
- Weighted random early
detection (WRED),
- Per VC flow control
- Per VC early packet
discard (EPD)
> VP and VC tunnels
> Host control via PCI bus
and software API
> Traffic shaping rates config-
urable from 0.006% to 100%
of line rate, with 1% accuracy
> Supports 32K bi-directional
connections
forum traffic management 4.1 specification. The host
selects the shaping parameters and priority on a per VC
basis at open channel time. A four level strict priority
scoreboard based mechanism is used to schedule cells
for transmission, allowing quality of service (QoS) level
guarantees. Shaping rates are available from 0.006% to
100% of line rate, with 1% accuracy.
Traffic Shaping
Traffic shaping is provided at the output of the segmen-
tation function. Each connection has two generic cell
rate algorithms (GCRAs) that support the CBR.1, VBR.1,
UBR.1 and UBR.2 conformance definitions in the ATM
Buffer Management
Two pools of buffers are supported: internal buffers and
host buffers. Internal buffers occupy local SDRAM and
are 64 bytes in length. Internal buffers are allocated to
one of 16 buffer classes during initialization.
>