cn8236 Mindspeed Technologies, cn8236 Datasheet - Page 194

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cn8236

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

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6.0 Traffic Management
6.3 ABR Flow Control Manager
Figure 6-14. CN8236 ABR-ER Feedback Generation (Destination Behavior)
6-26
6.3.2.3 Out-of-Rate
6.3.2.2 Destination
FORWARD_RM
BACKWARD_RM
Behavior
Cells
The CN8236 also responds to an incoming ABR cell stream as an ABR
Destination. The reassembly coprocessor processes received Forward RM cells. It
turns around this incoming information to the segmentation coprocessor via the
SCH_STATE part of the segmentation VCC table entry. The segmentation
coprocessor then formats Backward RM cells containing this information and
inserts these turnaround RM cells into the transmit cell stream.
backpressure to the Source. The host notifies the CN8236 of internal system
congestion. The CN8236 passes this information to the Source via Backward RM
cells, to flow control the transmitting Source. The SAR also processes the EFCI
bit in the data cell header(s) per the rules in TM 4.1.
In addition to in-rate cell streams, the CN8236 can also generate out-of-rate
(CLP = 1) cell streams. These CLP = 1 streams compliment and enhance the
information flow contained in the in-rate cell streams. An example of the use of
this mechanism is to send out-of-rate Forward RM cells on a channel if the
transmit rate on that channel has dropped below the schedule table minimum rate.
This provides a mechanism to restart scheduling of an ABR VCC whose rate has
dropped to 0 or below the schedule table minimum rate.
The CN8236 also provides a mechanism for the Destination host to apply
This process is illustrated in
Mindspeed Technologies
Segmentation
Coprocessor
Reassembly
Coprocessor
(Backward RM Cell Formatting)
(Forward RM Cell Processing)
Turnaround
Information
ATM ServiceSAR Plus with xBR Traffic Management
Figure
SCH_STATE
Table Entry
Seg VCC
6-14.
Backpressure
Congestion
28236-DSH-001-B
Host
CN8236
8236_046

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