Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [gigabit]

20 questions
6
votes
1 answer

Ethernet cabling: UTP, STP, FTP, etc, when is shielding useful/needed?

When installing cabling for Ethernet purposes, the question often arises: does one want/need simple UTP or any of the shielded variants, i.e. F/UTP, S/UTP, SF/UTP, U/FTP, F/FTP, S/FTP or SF/FTP, often labelled FTP or STP? Most sites with information…
jcaron
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2 answers

differential routing without GND

I have task that I need to make adapter board which transforms gigabit ethernet connector RJ45 to another connector (not RJ45). I also have power connector to carry power one side to other. I need to route 100ohm differential pair without GNd I…
erkan
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3
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1 answer

Implementing 1000BASE-T (Twisted pair) over PCB backplane

Problem: We are designing a small payload which will contain several ethernet capable devices connected via a backplane we must design. All guidelines concern the scenario where the PHY is connected to an RJ45 connector, but in my case I am…
Alexis
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2
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2 answers

Using an Ethernet gigabit PHY for only 100 and 10 Mbps speeds

I am designing a custom board. I have a USB to Ethernet converter which has 10/100 PHY and I want to connect that PHY to the gigabit Ethernet PHY. I have researched about that problem and found a Microchip topic which I shared below. Link:…
vision34
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2
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1 answer

How to choose a common mode choke for ethernet?

I'm currently working on a design which contains gigabit ethernet. Due to some weird size constraints, I can't use a magjack or one of those transformer ICs, so I'm using discrete magnetics. I've managed to pick a transformer (actually three...…
Harry Brooke
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2
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1 answer

POE power pass through

Is it possible to connect the center taps of two Ethernet magnetics to each other back-to-back to pass the power from one port to another. Does it make sense? Is anything special required?
dgo
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2
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1 answer

10/100Mbps Magnetics with 10/100/1000 PHY

I have a SOC that has a KSZ9031RN PHY, that is a Gigabit PHY. But I'm going to use only in 10/100 Mode with 4 wires. Gigabit PHY datasheet recommends a magnetic for Gigabit Ethernet, that are different from Fast Ethernet magnetics. Can I use 4 Wire…
Indexer
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2
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1 answer

Gigabit Ethernet Coupler Design

I'm doing a PCB design which includes a Gigabit Ethernet 'coupler' - i.e coupling from one CAT 5e cable to another via my PCB (see sketch below) My question is, how careful do I need to be with controlled impedance given that the PCB tracks will be…
Duncan
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2
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1 answer

Can I generate a 90° Clock signal with Xilinx's ODELAY for RGMII?

Some time ago I implemented a GMII interface for my Gigabit Ethernet core. Now I'm trying to do the same with the RGMII protocol. The reference implementation from Xilinx uses IDELAY[|E1|E2] primitives to adjust the input delay. I would like to do…
Paebbels
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vote
2 answers

Gearbox in 10GBASE-R Ethernet protocol

In 10GBASE-R specification, Gearbox is defined to take care the data width adaptation between PCS & PMA. For example, after the 64b66b encoding, the PCS data width will become 66bits. The gearbox will adapt the 66-bit datawidth to whatever data…
Learner
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2 answers

LVDS Flex Cables - Optimizing Trace Layout for 10 GbE

I want to run a 10 Gigabit Ethernet (GbE) signal over a 15 pin LVDS flex cable like this one: My PCB will accept an RJ45 connector, and those traces will run over the PCB to the flex jumper, then through the flex to another PCB. I want to optimize…
Jim
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1 answer

Could two LAN7800s be used to create a USB3-over-Ethernet extender?

I am looking to create a USB 3.0 extender and am considering the possibility of using two LAN7800 ICs to achieve this. My goal is to achieve speeds of up to 1Gbps. I already know that the PC will see a Network Adapter, but would it be possible to…
SimpleElecticalEngineer
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0
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Can you interface 2 gigabit ethernet ports via one rgmii interface?

Can we use the KSZ9893RNXC from Microchip as the Ethernet PHY chip, and interface the 2 gigabit ports to Allwinner H6, which has only one RGMII interface. Also please note that we are aiming at using the 2 gigabit ports…
Gokul Krishna
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2 answers

Gigabit transceiver with MHz reference clock

I've some experience with Xilinx FPGA generating 10Gb/s over SMA loopback with on-off keying modulation (what scope shows) to perform BER test but the documentation shows it uses a reference clock in MHz level. How is it possible to generate gigabit…
LifeIsBeatiful
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1 answer

Why this evaluation board use different track impedance than the right one? Ethernet PHY, routing

Im doing a design with a implementation of 1Gb ethernet switch, for that I bought a evaluation board to do it well. The problem is that in the layout of the ev board I can check that the track impedance used to link the output of the chip (which has…
Jesús Álvarez
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