MXT4400 Datasheet, PDF (1/4 Pages) List of Unclassifed Manufacturers – PortMakerI AAL5 Firmware

™
A CONEXANT BUSINESS
PortMakerI AAL5 Firmware
MXT4400 Traffic Stream Processor
OC-12 AAL5 SAR
PortMakerI firmware provides proven, reliable and fully
supported binary applications for the MXT4400 Traffic
Stream Processor. The ATM Adaptation Layer 5 (AAL5)
application provides a uni-directional OC-12 throughput
ITU I.363.5 SAR, traffic shaping and a rich set of
other features.
AAL5 Segmentation and Reassembly (SAR)
The PortMakerI 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 64K connections
in uni-directional mode (i.e., two chip solution). It can also
be configured in a bi-directional mode (i.e., one chip solu-
tion) with 2xOC-3 throughput and 32K connections. ATM
cell traffic uses the Utopia interface on the MXT4400, 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.
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,
> KEY FEATURES
> Uni-directional OC-12
> Per VC queuing
throughput
> VP Tunnels (with shaping)
> ITU I.363.5 compliant AAL5 SAR _{> Encapsulation/De-encapsulation}
> ATM Forum TM 4.1 traffic shaping _{> Reassembly time-out}
> Traffic shaping rates config-
urable from 0.006% to 100%
of line rate, with 1% accuracy
> Support for OAM and raw
cells (AAL0)
> Supports 64K connections
> Per PHY and per connection
statistics
> Supports up to 16 PHYs
> Host routing for control packets
> Choice of segmenter queue
admission policies:
> LANE LECID echo cancellation
- Random Early Detection (RED)
> LAN FCS generation and
checking
- Per VC flow control
> Host control via PCI bus and
- Per VC Early Packet
software API
Discard (EPD)
UBR.1 and UBR.2 conformance definitions in the ATM
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.
>