Questions tagged [gigabit]
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22 questions
0 votes
0 answers
86 views
Ethernet link ss only up with 10Mbps, No 100 or 1000Mbps even in forced condition
We are using Marvell 88E1512 with Xilinx ZU2CG SOC for 1000Mbps ethernet. Currently we are facing issue with ethernet link. Attached the schematics for your reference. The system description is below....
- 399
2 votes
0 answers
126 views
Can I apply RF hardware to split a full duplex transmission line
I have a bit of a headscratcher I've been trying to solve and wanted to get some opinions from more experienced EEs. For context, I am trying to split a bidirectional full duplex SERDES pair into ...
- 21
-3 votes
5 answers
192 views
Enough about bits, bytes in book language. I want to know what a bit is in general. Electricity? [closed]
It has been 4 years I am familiar with bits, bytes and true false, on off situation. What are bits in general? Are they electricity? When we say bits per second, are we talking about the speed of ...
- 189
0 votes
1 answer
48 views
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 ...
6 votes
1 answer
571 views
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 ...
- 2,324
2 votes
2 answers
2k views
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 ...
- 31
2 votes
1 answer
2k views
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 ...
- 133
0 votes
0 answers
420 views
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 ...
0 votes
2 answers
663 views
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 ...
- 145
2 votes
1 answer
123 views
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?
- 43
1 vote
2 answers
980 views
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 ...
- 193
2 votes
1 answer
548 views
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 ...
- 61
0 votes
1 answer
149 views
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 ...
0 votes
1 answer
224 views
Gigabit detection DIY
Ethernet up to 100Mbps uses only 2 of the 4 twisted wires in an ethernet cable while gigabit is using all of them. Connecting an LED to one of the gigabit-only pairs should therefore make it easy to ...
1 vote
2 answers
948 views
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 ...
- 1,677