Contents
What do you need to know about Ethernet Magnetics?
The properties that Ethernet magnetics need to have are specified in the standard – for example, a transformer for a 100BASE-T connection is required to have an inductance value of at least 350µH when a DC bias of 8mA is applied. Since these attributes are fixed, it may seem like Ethernet magnetics components are all the same.
Why is it important to follow Ethernet Routing standards?
Thankfully, Ethernet routing standards make it easy for designers to create everything from complex networking equipment to single-board computers for any application. The overall architecture for creating Ethernet-capable devices is deceptively simple, but certain rules should be followed to ensure signal integrity.
What are the rules for making an Ethernet device?
The overall architecture for creating Ethernet-capable devices is deceptively simple, but certain rules should be followed to ensure signal integrity. Within the IEEE 802 standards, Ethernet devices contain three primary elements, all of which must be routed together in a specific manner:
Which is the next stage in Ethernet layout routing?
Physical layer (PHY): The next stage in Ethernet layout routing is the PHY. This is typically an integrated circuit that converts the digital data from the MAC into analog signals for transmission down copper or optical fiber. Again, this could be integrated into the switch controller.
Can you connect two Ethernet PHY at the same time?
In a (tentative) new design I want to connect two 100 Mbit/s Ethernet PHY similar to LAN8270a, separated by few inches on the same PCB, with same ground plane (but different power supplies).
What kind of PHY do I need for Ethernet?
What you really need is a different variety of PHY, so called “backplane phy”. Those are specifically designed to work with capacitive coupling over PCB traces. The relevant standard is called 802.3ap.
Which is better magnetic jacks or discrete jacks for Ethernet?
The alternative is connector jacks with integrated magnetics, called Integrated Connector Modules (ICMs). ICMs are usually slightly more expensive than going the discrete route, but they are very quick and easy to design-in and provide assurance that the connection will comply with Ethernet standards.