cn8236 Mindspeed Technologies, cn8236 Datasheet - Page 173

• Manufacturer Part Number: cn8236
• Description: Atm Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

CN8236
ATM ServiceSAR Plus with xBR Traffic Management
6.1.2 ABR Flow Control Manager
Figure 6-2. ABR Flow Control
28236-DSH-001-B
ABR Flow Control
Templates
Manager
ABR
UPDATE
RATE
The CN8236 implements the ATM Forum ABR flow control algorithms, referred
to in the aggregate as ABR by this document. The ABR service category
effectively allows 0 cell loss transmission through an ATM network, by regulating
transmission based upon network feedback. The ABR algorithms regulate the rate
of each VCC independently.
CN8236’s ABR feedback control loop.
ABR Flow Control Manager. This state machine processes the feedback
information according to per-VCC parameters and user-programmable ABR
templates, both located in SAR-shared memory. These templates define ABR
service parameters and policies for groups of VCCs.
Scheduler with an updated rate. Under the policy imposed by the template, the
rate complies with the TM 4.1 Source Behavior specifications. Until the next
update, the Cell Scheduler uses this rate to dynamically schedule the connection.
Network feedback is received by the reassembly coprocessor and routed to the
Once the feedback is processed, the Flow Control Manager provides the Cell
Cell Scheduler
Parameters
and Priority
Schedule
Dynamic
Per-VCC
Table
Mindspeed Technologies
VCC_INDEX
Figure 6-2
Segmentation
Coprocessor
Coprocessor
Reassembly
shows a high level block diagram of the
™
Cell Stream
Feedback
ABR
RM Cell
6.0 Traffic Management
Network
ATM
6.1 Overview
8236_036
6-5