IEEE 802.3cm pdf download

IEEE 802.3cm-2020 pdf download.IEEE Standard for Ethernet Amendment 7:  Physical Layer and Management Parameters for 400 Gb/s over Multimode Fiber
1.3 Normative references
Insert the following two references in alphanumeric order:
ANSI/TIA-604-18-A:2018, FOCIS 18—Fiber Optic Connector Intermateability Standard—Type MPO-16. 2 IEC 61754-7-2:2017, Fibre optic interconnecting devices and passive components—Fibre optic connector interfaces—Part 7-2: Type MPO connector family—Two fibre rows. 3
1.4 Definitions
Insert two new definitions after 1.4.110 “400GBASE-SR16” as follows:
1.4.110a 400GBASE-SR4.2: IEEE 802.3 Physical Layer specification for 400 Gb/s using 400GBASE-R encoding  ver eight lanes on multimode fiber in a bidirectional WDM format, with reach up to at least 150 m. (See IEEE Std 802.3, Clause 150.)
1.4.110b 400GBASE-SR8: IEEE 802.3 Physical Layer specification for 400 Gb/s using 400GBASE-R encoding ver eight lanes of multimode fiber, with reach up to at least 100 m. (See IEEE Std 802.3,Clause 138.)
30. Management
30.5 Layer management for medium attachment units (MAUs)
30.5.1 MAU managed object class
30.5.1.1 MAU attributes
30.5.1.1.2 aMAUType
Insert 400GBASE-SR8 and 400GBASE-SR4.2 PHY types into the “APPROPRIATE SYNTAX” section
of 30.5.1.1.2 after 400GBASE-SR16, as follows:
400GBASE-SR8 400GBASE-R PCS/PMA over 8-lane multimode fiber PMD as specified in Clause 138
400GBASE-SR4.2 400GBASE-R PCS/PMA over 8-lane multimode fiber PMD as specified in Clause 150
45. Management Data Input/Output (MDIO) Interface
45.2 MDIO Interface Registers
45.2.1 PMA/PMD registers
45.2.1.6 PMA/PMD control 2 register (Register 1.7)
Change the indicated reserved rows of Table 45–7 (as modified by IEEE Std 802.3cn-2019) as follows (unchanged rows not shown):
45.2.1.7 PMA/PMD status 2 register (Register 1.8)
45.2.1.7.4 Transmit fault (1.8.11)
Change the row for 50GBASE-SR, 100GBASE-SR2, 200GBASE-SR4 in Table 45–9 (as inserted by IEEE Std 802.3cd-2018) and insert a new row for 400GBASE-SR4.2 after the row for 400GBASE-SR16 as follows (unchanged rows not shown):
45.2.1.7.5 Receive fault (1.8.10)
Change the row for 50GBASE-SR, 100GBASE-SR2, 200GBASE-SR4 in Table 45–10 (as inserted by IEEE Std 802.3cd-2018) and insert a new row for 400GBASE-SR4.2 after the row for 400GBASE-SR16 as follows (unchanged rows not shown):
45.2.1.8 PMD transmit disable register (Register 1.9)
Change the row for 50GBASE-SR, 100GBASE-SR2, and 200GBASE-SR4 in Table 45–12 (as inserted by IEEE Std 802.3cd-2018) and insert a new row for 400GBASE-SR4.2 after the row for 400GBASE-SR16 as follows (unchanged rows not shown)
45.2.1.21 400G PMA/PMD extended ability register (Register 1.24)
Change the row for bits 1.24.9:6 in Table 45–24 (as inserted by IEEE Std 802.3cn-2019) as follows (unchanged rows not shown):
Insert 45.2.1.21.1b and 45.2.1.21.1c after 45.2.1.21.1a (as inserted by IEEE Std 802.3cn-2019) as follows:
45.2.1.21.1b 400GBASE-SR4.2 ability (1.24.7)
When read as a one, bit 1.24.7 indicates that the PMA/PMD is able to operate as a 400GBASE-SR4.2 PMA/PMD type. When read as a zero, bit 1.24.7 indicates that the PMA/PMD is not able to operate as a 400GBASE-SR4.2 PMA/PMD type.
45.2.1.21.1c 400GBASE-SR8 ability (1.24.6)
When read as a one, bit 1.24.6 indicates that the PMA/PMD is able to operate as a 400GBASE-SR8 PMA/PMD type. When read as a zero, bit 1.24.6 indicates that the PMA/PMD is not able to operate as a 400GBASE-SR8 PMA/PMD type.
78. Energy-Efficient Ethernet (EEE)
78.1 Overview
78.1.4 PHY types optionally supporting EEE
Insert two new rows in Table 78–1 immediately below 400GBASE-SR16, as follows (unchanged rows not shown):
Table 78–1—Clauses associated with each PHY or interface type
116. Introduction to 200 Gb/s and 400 Gb/s networks
116.1 Overview
116.1.2 Relationship of 200 Gigabit and 400 Gigabit Ethernet to the ISO OSI reference model
Change exception g) in 116.1.2 (as modified by IEEE Std 802.3cn-2019) as follows:
g) The MDIs as specified in Clause
122 for 400GBASE-FR8, 400GBASE-LR8, and 400GBASE-ER8,in Clause 138 for 400GBASE-SR8, and in Clause 150 for 400GBASE-SR4.2, all use uses an 8-lane data path.
116.2 Summary of 200 Gigabit and 400 Gigabit Ethernet sublayers
116.2.5 Physical Medium Dependent (PMD) sublayer
Change the second paragraph of 116.2.5 (as amended by IEEE Std 802.3cd-2018) as follows:
The 200GBASE-R PMDs and their corresponding media are specified in Clause 121, Clause 122, and Clause 136 through Clause 138. The 400GBASE-R PMDs and their corresponding media are specified in Clause 122 through Clause 124, Clause 138, and Clause 150.
116.4 Delay constraints
Change Table 116–6 (as amended by IEEE Std 802.3cn-2019) as follows.IEEE 802.3cm pdf download.IEEE 802.3cm pdf