cn8236 Mindspeed Technologies, cn8236 Datasheet - Page 192
cn8236
Manufacturer Part Number
cn8236
Description
Atm Servicesar Plus With Xbr Traffic Management
Manufacturer
Mindspeed Technologies
Datasheet
1.CN8236.pdf
(443 pages)
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6.0 Traffic Management
6.3 ABR Flow Control Manager
6.3.1 A Brief Overview of TM 4.1
6.3.2 Internal ABR Feedback Control Loop
Figure 6-12. ABR Service Category Feedback Control
6-24
Variable
Shaping
Rate
Source
(Backward_RM)
6.3 ABR Flow Control Manager
This section briefly describes the TM 4.1 ABR Flow Control algorithms.
However, it is strongly recommended that the reader be familiar with the ATM
Forum’s TM 4.1 Specification before attempting to understand the CN8236’s
ABR implementation.
As a complete implementation of the UNI ATM layer, the CN8236 acts as an
ABR Source and Destination, complying with all required TM 4.1 ABR
behaviors. The CN8236 utilizes the dynamic rate adjustment capability of the
xBR Cell Scheduler as the Source’s variable rate-shaper. An internal feedback
mechanism supplies feedback from the received cell stream to the ABR Flow
Control Manager, a special purpose state machine. This state machine translates
the feedback extracted from received Backward RM cells, to instructions for the
xBR Cell Scheduler and segmentation coprocessor. It supports both binary and
ER flow control methods.
BW_RM
Figure 6-12
Mindspeed Technologies
illustrates this basic concept.
( 1 Switches)
Congestion
Algorithms
Network
Switch
ATM
ATM ServiceSAR Plus with xBR Traffic Management
FW_RM
(ForWard_RM)
™
(TurnAround_RM)
Internal Congestion
Destination
Backpressure
TA_RM
28236-DSH-001-B
CN8236
8236_044
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