In this article, we\u2019ll explore the architecture, functions, and interaction between Ethernet MAC and PHY\u2014and how LINK-PP contributes to this ecosystem with high-performance components such as SFP optical transceivers<\/a> and integrated magnetic RJ45 connectors<\/a>.<\/p>\n\n\n\n The MAC (Media Access Control)<\/strong> is part of the data link layer (Layer 2)<\/strong> in the OSI model. It is responsible for:<\/p>\n\n\n\n Frame encapsulation and decapsulation<\/p><\/li> Media access arbitration (half\/full duplex)<\/p><\/li> Error detection via CRC<\/p><\/li> Addressing using MAC addresses<\/p><\/li>\n<\/ul>\n\n\n\n MAC functionality is often integrated into:<\/p>\n\n\n\n Network Interface Cards (NICs)<\/p><\/li> System-on-Chips (SoCs)<\/p><\/li> Ethernet switches<\/p><\/li> Embedded processors (ARM, RISC-V)<\/p><\/li>\n<\/ul>\n\n\n\n The MAC interfaces with the PHY through a standard like RGMII<\/strong>, SGMII<\/strong>, or XGMII<\/strong>, depending on data rate and application.<\/p>\n\n\n\n The PHY (Physical Layer Device)<\/strong><\/a> operates at the physical layer (Layer 1)<\/strong> of the OSI model and is responsible for:<\/p>\n\n\n\n Line encoding and decoding (e.g., 8b\/10b, PAM-4)<\/p><\/li> Modulation and demodulation<\/p><\/li> Clock and data recovery<\/p><\/li> Signal conditioning<\/p><\/li> Auto-negotiation and link training<\/p><\/li>\n<\/ul>\n\n\n\n The PHY converts digital signals from the MAC into analog electrical or optical signals for transmission over copper (e.g., CAT6 cables via RJ45<\/a>) or fiber (e.g., SFP modules<\/a>).<\/p>\n\n\n\n Here\u2019s a simplified architecture:<\/p>\n\n\n\n The MAC manages digital packet formatting, while the PHY handles the signal transmission. Together, they enable Ethernet communication<\/strong> across LANs, WANs, and data centers.<\/p>\n\n\n\n At LINK-PP, we design and manufacture a wide range of Ethernet interconnect components that support MAC\/PHY architectures, including:<\/p>\n\n\n\n LINK-PP\u2019s RJ45 connectors with integrated magnetics<\/strong> help simplify PCB design and improve EMI suppression. These modules directly interface with the PHY and are ideal for:<\/p>\n\n\n\n Gigabit Ethernet switches<\/p><\/li> Embedded IoT boards<\/p><\/li> Power-over-Ethernet (PoE) systems<\/p><\/li>\n<\/ul>\n\n\n\n ➡ Explore: LINK-PP RJ45 Connectors<\/a><\/p>\n\n\n\n When the PHY connects to fiber optics, it typically interfaces through SFP or SFP+ modules<\/strong>. LINK-PP offers a wide portfolio of optical transceivers<\/strong> that support:<\/p>\n\n\n\n 1G\/10G\/25G\/100G Ethernet<\/p><\/li> Short-range (SR), long-range (LR), and BiDi variants<\/p><\/li> Compatibility with Cisco, Juniper, Intel, etc.<\/p><\/li>\n<\/ul>\n\n\n\n![\"Ethernet](\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/cd52634360ec428186509aa8f6e519e0.jpg\")
<\/figure>\n\n\n\nWhat Is the Ethernet MAC?<\/h2>\n\n\n\n
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Where Is MAC Found?<\/h3>\n\n\n\n
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What Is the Ethernet PHY?<\/h2>\n\n\n\n
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How MAC and PHY Work Together<\/h2>\n\n\n\n
[CPU] <\/code>\u2193 <\/code>[MAC Controller] \u2013 (RGMII\/SGMII) \u2013 [PHY Chip] \u2013 [RJ45 or SFP Module] <\/code>\u2193 <\/code> [Ethernet Cable] <\/code><\/p>\n\n\n\nLINK-PP: Supporting MAC\/PHY Integration<\/h2>\n\n\n\n
1. RJ45 Integrated Magnetics<\/strong><\/h3>\n\n\n\n
![\"RJ45](\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/5594cbfdc399420c88c66da1afc8ed62.webp\")
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2. SFP Optical Transceiver Modules<\/strong><\/h3>\n\n\n\n
![\"Optical](\"https:\/\/lp.szlogic.cn\/wp-content\/uploads\/2026\/05\/dd5db2667993476c90943abeea5ba9b2.webp\")
<\/figure>\n\n\n\n\n