IEEE Std 802.3cc-2017 pdf free download – IEEE Standard for Ethernet Amendment 1 1 : Physical Layer and Management Parameters for Serial 25 Gb/s Ethernet Operation Over Single-Mode Fiber.
105. Introduction to 25 Gb/s networks
105.1 Overview
105.1.1 Scope
Change the first paragraph of 105.1.1 (as inserted by IEEE Std 802.3by-2016 and modified by IEEE Std 802.3bq-2016) as follows:
25 Gigabit Ethernet uses the IEEE 802.3 MAC sublayer, connected through a 25 Gigabit Media Independent Interface (25GMII) to Physical Layer entities such as 25GBASE-CR, 25GBASE-CR-S, 25GBASE-KR, 5GBASE-KR-S, 25GBASE-SR, and 25GBASE-T, 25GBASE-LR, and 25GBASE-ER.
105.1.2 Relationship of 25 Gigabit Ethernet to the ISO OSI reference model Change item c) of 105.1.2 (as inserted by IEEE Std 802.3by-2016) as follows:
a) The Media Dependent Interface (MDI) as specified in Clause 110 for 25GBASE-CR and 25GBASE-CR-S, in Clause 111 for 25GBASE-KR and 25GBASE-KR-S, or in Clause 112 for 25GBASE-SR, or in Clause 114 for 25GBASE-LR and 25GBASE-ER uses a single-lane data path.
105.1.3 Nomenclature
Change the second paragraph of 105.1.3 (as inserted by IEEE Std 802.3by-2016) as follows:
The term 25GBASE-R refers to a specific family of Physical Layer implementations based upon the 64B/66B data coding method specified in Clause 107. The 25GBASE-R family is composed of
25GBASE-CR, 25GBASE-CR-S, 25GBASE-KR, 25GBASE-KR-S, and 25GBASE-SR, 25GBASE-LR,and 25GBASE-ER.
105.3 Summary of 25 Gigabit Ethernet sublayers
105.3.5 Physical Medium Dependent (PMD) sublayer
Change the third paragraph of 105.3.5 (as inserted by IEEE Std 802.3by-2016) as follows:
The 25GBASE-R PMDs and their corresponding media are specified in Clause 110, Clause 111, and Clause 112, and Clause 114.
105.5 Delay constraints
Insert two new rows below 25GBASE-SR PMD in Table 105-3 (as inserted by IEEE Std 802.3by-2016) and above 25GBASE-T (as inserted by IEEE Std 802.3bq-2016) as follows:
105.7 Protocol implementation conformance statement (PICS) proforma
Change the first paragraph of 105.7 (as added by IEEE Std 802.3by-2016) as follows:
The supplier of a protocol implementation that is claimed to conform to any part of IEEE Std 802.3,Clause 45, Clause 73, Clause 74, Clause 106 through Clause 112, Clause 114, and related annexes demonstrates compliance by completing a protocol implementation conformance statement (PICS) proforma.
108. Reed-Solomon Forward Error Correction (RS-FEC) sublayer for 25GBASE-R PHYs
108.5 Functions within the 25GBASE-R RS-FEC sublayer
108.5.3 Receive function
108.5.3.2 Reed-Solomon decoder
Change the third paragraph of 108.5.3.2 (as added by IEEE Std 802.3by-2016) as follows:
The Reed-Solomon decoder may provide the option to perform error detection without error correction to reduce the delay contributed by the 25GBASE-R RS-FEC sublayer. The presence of this option is indicated by the assertion of the FEC_bypass_correction_ability variable (see 108.6.4). When the option is provided,it is enabled by the assertion of the FEC_bypass_correction_enable variable (see 108.6.1). This option shall not be used when the 25GBASE-R RS-FEC sublayer is used to form part of a 25GBASE-SR,25GBASE-LR, or 25GBASE-ER PHY.IEEE Std 802.3cc pdf download