28236-BRF-001-A_15 Datasheet, PDF (1/4 Pages) M/A-COM Technology Solutions, Inc. – OC-3 ATM SAR Controller with UTOPIA Level 2

OC-3 ATM SAR Controller with UTOPIA Level 2
CN8236
ATM OC-3 Service SAR Plus with xBR
Traffic Management
Mindspeed’s CN8236 Service Segmentation and
Reassembly (ServiceSAR) controller integrates ATM
terminal functions, PCI bus master and slave controllers,
and a UTOPIA 1 or 2 interface with service-specific func-
tions in a single package for AAL0, AAL3/4, and AAL5
operations. The ServiceSAR controller generates and
terminates ATM traffic (TM. 4.1) and automatically
schedules cells for transmission with patented xBR
traffic management. The CN8236 is targeted at 155
Mbps throughput systems where the number of VCCs is
relatively large, or the performance of the overall system
is critical. Examples of such networking equipment include
routers, Ethernet switches, ATM edge switches, or frame
relay switches.
> KEY FEATURES
> AAL0, AAL3/4, AAL5, inter-
working function for AAL1/2
scheduling (cell-on-demand
scheduling)
> ATM TM 4.1 service cate-
gories: ABR, CBR, GFR, VBR-
rt, VBR-nrt, GFR
> Service-specific performance
accelerators – LECD filtering
and echo suppression,
CLP0+1, Frame Relay DE
interworking
> Dynamic per-VCC scheduling
> Multi-peer architecture with
up to 32 peers
> Head-of-line blocking protec-
tion for multi-PHY operation
> 64 K VCC, 155 Mbps full duplex
with 2-cell PDU
> UTOPIA Level 2, 8/16 bit
@ 50 MHz
> 33 MHz (up to 40 MHz), PCI 2.1
> 388 BGA, low-power
dissipation
> Flexible tunneling with mixed
service categories
(16 priorities)
Service-Specific Performance Accelerators
The CN8236 incorporates numerous service-specific
features designed to accelerate and enhance system
performance. For example, the CN8236 implements
echo suppression of LAN traffic via LECID filtering,
and supports frame relay DE to CLP interworking.
Advanced xBR Traffic Management
The xBR traffic manager in the CN8236 supports multiple
ATM service categories. These include CBR, VBR (both
single and dual leaky bucket), UBR, GFR (guaranteed
frame rate), and ABR (explicit rate, relative rate and EFCI
marking). The CN8236 manages each VCC independently.
It dynamically schedules segmentation traffic to comply
with up to 16+CBR user-configured scheduling priorities
for the various traffic classes. Scheduling is controlled
by a schedule table configured by the user and based
on a user-specified time reference. ABR channels are
managed in hardware according to user-programmable
ABR templates. These templates tune the performance
of the CN8236’s ABR algorithms to a specific system’s
or network’s requirements.
>