IEEE Std 802.3cm-2020
IEEE Standard for Ethernet—Amendment 7:
Physical Layer and Management Parameters for 400 Gb/s over Multimode Fiber
13
Copyright © 2020 IEEE. All rights reserved.
138.3.2.2 Skew Constraints for 100GBASE-SR2, and 200GBASE-SR4, and
400GBASE-SR8 ..................................................................................................... 31
138.4 PMD MDIO function mapping................................................................................................... 31
138.5 PMD functional specifications.................................................................................................... 32
138.5.1 PMD block diagram.......................................................................................................... 32
138.5.2 PMD transmit function ..................................................................................................... 33
138.5.3 PMD receive function ....................................................................................................... 34
138.5.4 PMD global signal detect function ................................................................................... 34
138.5.5 PMD lane-by-lane signal detect function ......................................................................... 34
138.5.8 PMD lane-by-lane transmit disable function (optional) ................................................... 35
138.6 Lane assignments........................................................................................................................ 35
138.7 PMD to MDI optical specifications for 50GBASE-SR, 100GBASE-SR2, and
200GBASE-SR4, and 400GBASE-SR8 ..................................................................................... 35
138.7.1 Transmitter optical specifications..................................................................................... 35
138.7.2 Receiver optical specifications ......................................................................................... 36
138.7.3 Illustrative link power budget ........................................................................................... 36
138.8 Definition of optical parameters and measurement methods...................................................... 37
138.8.1 Test patterns for optical parameters.................................................................................. 37
138.8.5 Transmitter and dispersion eye closure for PAM4 (TDECQ) .......................................... 37
138.8.5.1 TDECQ reference equalizer.................................................................................... 37
138.8.10 Stressed receiver sensitivity.............................................................................................. 37
138.9 Safety, installation, environment, and labeling........................................................................... 38
138.9.2 Laser safety ....................................................................................................................... 38
138.9.4 Environment...................................................................................................................... 38
138.9.5 Electromagnetic emission ................................................................................................. 38
138.9.7 PMD labeling requirements .............................................................................................. 38
138.10 Fiber optic cabling model ........................................................................................................... 38
138.10.1 Fiber optic cabling model ................................................................................................. 38
138.10.3 Medium Dependent Interface (MDI) ................................................................................ 38
138.10.3.1 Optical lane assignments for 100GBASE-SR2, and 200GBASE-SR4, and
400GBASE-SR8 ..................................................................................................... 39
138.10.3.4 MDI requirements for 400GBASE-SR8................................................................. 40
138.11 Protocol implementation conformance statement (PICS) proforma for Clause 138, Physical
Medium Dependent (PMD) sublayer and medium, type 50GBASE-SR, 100GBASE-SR2,
200GBASE-SR4, 400GBASE-SR8............................................................................................ 41
138.11.1 Introduction....................................................................................................................... 41
138.11.2 Identification..................................................................................................................... 41
138.11.2.2 Protocol summary ................................................................................................... 41
138.11.3 Major capabilities/options................................................................................................. 42
138.11.4 PICS proforma tables for Physical Medium Dependent (PMD) sublayer and
medium, type 50GBASE-SR, 100GBASE-SR2, 200GBASE-SR4, 400GBASE-SR8 .... 42
138.11.4.1 PMD functional specifications................................................................................ 43
138.11.4.6 Characteristics of the fiber optic cabling and MDI................................................. 43
150. Physical Medium Dependent (PMD) sublayer and medium, type 400GBASE-SR4.2 ........................ 46
150.1 Overview..................................................................................................................................... 46
150.1.1 Bit error ratio .................................................................................................................... 47
150.2 Physical Medium Dependent (PMD) service interface .............................................................. 47
150.3 Delay and Skew .......................................................................................................................... 48
150.3.1 Delay constraints............................................................................................................... 48
150.3.2 Skew constraints ............................................................................................................... 48
150.4 PMD MDIO function mapping................................................................................................... 49
150.5 PMD functional specifications.................................................................................................... 49
Authorized licensed use limited to: ping cai. Downloaded on December 19,2021 at 06:30:31 UTC from IEEE Xplore. Restrictions apply.