RS8234 Mindspeed Technologies, RS8234 Datasheet - Page 20
RS8234
Manufacturer Part Number
RS8234
Description
Atm Servicesar Plus With Xbr Traffic Management
Manufacturer
Mindspeed Technologies
Datasheet
1.RS8234.pdf
(401 pages)
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Table of Contents
6.4
6.5
6.3.2 Internal ABR Feedback Control Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22
6.3.3 Source and Destination Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
6.3.4 ABR VCC Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
6.3.5 ABR Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25
6.3.6 Cell Type Decisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25
6.3.7 Rate Decisions and Updates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29
6.3.8 Boundary Conditions and Out-of-Rate RM Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35
6.4.1 A Brief Overview of GFC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-36
6.4.2 The RS8234’s Implementation of GFC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-36
6.5.1 Schedule Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38
6.5.2 CBR-Specific Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38
6.5.3 VBR-Specific Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-40
6.5.4 GFR-Specific Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-43
6.5.5 ABR-Specific Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-45
GFC Flow Control Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-36
Traffic Management Control and Status Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38
6.3.2.1 Source Flow Control Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23
6.3.2.2 Destination Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
6.3.2.3
6.3.6.1 In-rate Cell Streams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25
6.3.6.2 ABR Cell Decisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-27
6.3.7.1 ABR Traffic Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29
6.3.7.2 Rate Adjustment Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29
6.3.7.3 Backward RM Cell Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-30
6.3.7.4 Forward RM Cell Transmission Decisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34
6.3.7.5 Optional Rate Adjustment in Turnaround RM Cells Based on Congestion in the
6.3.7.6 Optional Rate Adjustment Due to Use-It-Or-Lose-It Behavior . . . . . . . . . . . . . . 6-35
6.3.8.1 Calculated Rate Boundaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35
6.3.8.2 Out-of-Rate Forward RM Cell Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35
6.3.8.3 Out-of-Rate Backward RM Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35
6.4.2.1 Configuring the Link for GFC Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37
6.5.2.1 CBR Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38
6.5.2.2 Tunnel Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38
6.5.2.3 SCH_STATE Fields For CBR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-39
6.5.3.1 VBR SCH_STATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-40
6.5.3.2 \VBR1 or VBR2 Schedule State Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-40
6.5.3.3 VBR1 or VBR2 Schedule State Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-41
6.5.3.4 Bucket Table for VBR2 and VBRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-42
6.5.4.1 GFR Schedule State Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-43
6.5.4.2 GFR MCR Limit Bucket Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-44
Out-of-Rate Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24
Switch 6-34
Mindspeed Technologies
ATM ServiceSAR Plus with xBR Traffic Management
™
28234-DSH-001-B
RS8234
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