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Contents
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Tables
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Preface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
How This Redbook Is Organized
........................... xi
The Team That Wrote This Redbook
......................... xii
Comments Welcome
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Chapter 1. Introduction to ATM Networks
...................... 1
1.1 ATM Fundamentals
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1.1 ATM Cells
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1.2 ATM Connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1.3 ATM Addressing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1.4 ATM Data Flows
............................... 3
Chapter 2. Introduction to the IBM 8285 Nways ATM Workgroup Switch
... 9
2.1 8285 Components
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Base Unit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.1 Internal Features
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.2 8285 Front Panel
................................ 11
2.2.3 155 Mbps ATM I/O Card
........................... 13
2.3 Expansion Unit (FC 5502)
............................. 13
2.3.1 Internal Features
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3.2 Front Panel
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4 Installable Modules
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Chapter 3. Functional Overview of the IBM 8285
................. 17
3.1 IBM 8285 Architecture Overview
......................... 17
3.2 Switching Fabric
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.2.1 Switching in the IBM 8285
.......................... 22
3.2.2 Switching Scenarios
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.3 Control Point Codes
................................ 28
3.3.1 Control Point Levels
............................. 29
3.3.2 Control Point V1.2
............................... 30
3.3.3 Control Point V1.3
............................... 30
3.3.4 Control Point V1.4
............................... 31
3.4 ATM Backplane / Expansion Unit Connection
................. 33
3.5 LAN Emulation Server Functions
......................... 33
Chapter 4. IBM 8285 ATM Modules
......................... 35
4.1 Modules Currently Available for the 8285 ATM Subsystem
......... 35
4.2 Some Common Elements among the 8285 Modules
............. 36
4.2.1 Maximum Capacity
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.2.2 Variable VPC/VCC Value Ranges
...................... 36
4.3 ATM 12-Port 25 Mbps UTP Concentrator Module
............... 38
4.3.1 Sample Scenarios
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.4 ATM 2-Port 155 Mbps Flexible Media Module and ATM 3-Port 155 Mbps
LAN Concentration Module
.............................. 42
4.4.1 Differences between the 2- and 3-Port ATM Modules
.......... 43
4.4.2 ATM 155 Mbps Media Module Traffic Management
........... 43
Copyright IBM Corp. 1996 iii