InfiniBand
TM
Architecture Release 1.5 August 14, 2023
VOLUME 2 - PHYSICAL SPECIFICATIONS Draft - Not for Release
InfiniBand
SM
Trade Association Page 5 Proprietary
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3.7 Chassis Slot Mechanical ..........................................................................................75
3.8 Power........................................................................................................................76
3.9 Hardware Management ............................................................................................77
3.10 Operating System (OS) Power Management ...........................................................78
Chapter 4: Port Signal Definitions .................................................................79
4.1 Signal Naming Conventions .....................................................................................79
4.2 Port Signal Summary................................................................................................80
4.2.1 Backplane Port ..................................................................................................... 81
4.2.2 Cable Port Using MicroGigaCN Connector........................................................... 83
4.2.3 Fiber Optic Port..................................................................................................... 84
4.2.4 Active Cable Port Using MicroGigaCN Connector................................................ 85
4.2.5 Cable Port Using QSFP/QSFP+ Connector Interface .......................................... 86
4.2.6 Cable Port Using OSFP Connector Interface ....................................................... 86
4.2.7 Cable Port Using CXP/CXP+ Connector Interface ............................................... 86
4.3 Signaling Group ........................................................................................................86
4.3.1 High Speed Electrical............................................................................................ 86
4.3.2 High Speed Optical............................................................................................... 86
4.4 Hardware Management Group .................................................................................87
4.5 Bulk Power Group.....................................................................................................87
4.6 Auxiliary Power Group ..............................................................................................88
4.7 Active Cable Power Group .......................................................................................88
Chapter 5: Link/Phy Interface .........................................................................90
5.1 Introduction ...............................................................................................................90
5.2 Symbol Encoding (8b/10b coding)............................................................................95
5.2.1 Notation conventions ............................................................................................ 95
5.2.2 Valid and invalid code-groups ............................................................................... 97
5.2.3 Running disparity rules ....................................................................................... 104
5.2.4 Generating code-groups ..................................................................................... 107
5.2.5 Checking the validity of received code-groups ................................................... 107
5.3 Block Encoding (64b/66b).......................................................................................108
5.3.1 Scrambling.......................................................................................................... 108
5.3.2 Checking the validity of a received block ............................................................ 113
5.3.3 Block synchronization ......................................................................................... 114
5.3.4 Error Detection Per Lane .................................................................................... 117
5.4 Modulation ..............................................................................................................118
5.4.1 Gray Coding for PAM4 modulation ..................................................................... 119
5.4.2 Precoding for PAM4 modulation ......................................................................... 119
5.5 Forward Error Correction ........................................................................................121
5.5.1 Fire Code FEC .................................................................................................... 122
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