Questions tagged [network-interface]
The network-interface tag has no usage guidance.
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Physical interface for ADSL Annex J
My mom’s ADSL line got upgraded from Annex B (bundled with ISDN) to Annex J (pure ADSL) a few months ago.
While doing maintenance at her house, I noticed that of the two wires coming into the house ...
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Can M-LVDS be used as bus protocol?
https://www.analog.com/media/en/technical-documentation/application-notes/AN-1177.pdf
In the document, it states that CAN is robust but M-LVDS is low power alternative of that. However, I couldn't be ...
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SFP, understanding control pins
I have an FS SFP (SFP-GB-GE-T 1000BASE-T SFP 100m).
My device has some I/O pins such as TX_DISABLE, RATE_SELECT_1 and RATE_SELECT_0, etc. I am having a hard time finding documentation on these ...
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How Nic process packets
As packet arrives Nic detect it on its interface like wire/air and than packet is kept in Rx FIFO the on chip memory for further processing like offloading and determining it belong to it after ...
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RL-TCPnet crash when send and get at the same time
I'm working on a web service with RL-ARM libraries. I want to send some parameters with AJAX as .cgx file and at the same time I want to create a socket and then send a lot of data to the destination.
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2
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Interfacing RJ45 to 3 pin RMII and bidirectionality
I am trying to add an Ethernet interface to a dev board (This board specifically).
From looking at the schematics, I see that it has a 3 pin PHY input (GND, TRX+, and TRX-). From my understanding, a ...
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What to do with unused pins on a 1000BaseT RJMAG jack
Trying to figure out what to do with the unused wires heading into the magnetics on an RJMG2330A1610ER Ethernet/USB jack. Due to the craziness in manufacturing in the world I am forced to find a ...
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QSFP-DD to 8x 10G SFP+
I am trying to use a QSFP-DD port on an FPGA to breakout and interface with 4 or 8 SFP+ ports. I am curious if this is possible. From my research online, it seems like this all depends on the module ...
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What connector is this? (Inside a wifi modem)
I was about to attach an antenna to my 4g modem and thus trying to identify which connector is there on my modem board and i found this connector (4 of them, 2 for 4g and 2 for wifi).
I tried ...
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W5500 network configuration issues
I have used W5500 hardware for my gateway device. It has been implemented in 80-100 locations. But in 4-5 locations I'm getting an unusual issue related to the network connection.
The ethernet mode is ...
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How to code communication between two enc28j60?
I am new to embedded programming and enc28j60. I am developing a project which includes two boards with Enc28j60. The working of the system is explained below.
board 1 : It will request data from ...
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A TVS for lightning surge protection
A camera will be mounted outside and powered via POE to Aruba 2540 network switch. I don't want indirect lightning surge to travel into the network switch. I don't care if the camera gets destroyed.
...
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452
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Why does the 10G XGMII specification mention a 32b instead of 64b bus for 156.25MHz?
I'm currently reading the IEEE XGMII specification (IEEE Std 802.3-2005 Clause 46) and I'm really surprised because it mentions a 32b data width for a frequency of ...
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Do Broadcom's Ethernet chipsets need special software to operate?
I want to implement an Ethernet switch using Broadcom's chips. Are singing an NDA and getting the datasheets enough to work with the chips? I have heard that the chips must be programmed by a special ...
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Direct connection between two SFP+ cables [closed]
I have been reading a lot about modern fiber networking recently and I have a clarifying semi-hypothetical question:
Imagine I have two 3-foot sections of Multi Mode Fiber, and four SFP+ 10G ...
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Ethernet Interface PCB layout requirement (if any)
I am doing Ethernet communication to/from an MCU.
I got it working great with an ENC28J60 development module:
https://www.digikey.com/product-detail/en/olimex-ltd/ENC28J60-H/1188-1044-ND/3471433
I ...
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707
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KSZ8895 Switch-Circuit Problem
For an application I am trying to get a switch running using the KSZ8895 (standalone). For testing, at first, I connected it only to MagJacks.
If I test the circuit and connect two PCs, this worked (...
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710
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Can we do source transformation for dependent sources? [closed]
In network analysis, during source transformation for dependent sources
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357
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Using a NIC to do Wake on LAN? Or alternatives [closed]
I have a small linux system (kind of like a raspberry pi, but alot smaller and cheaper) that I want to use to back up files by rSync on a roughly-monthly basis. My problem is that the board doesn't ...
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Converted from ms per int to Hertz [closed]
I am trying to convert from ms per int to Hertz.
I have found that my system takes 0.2313ms to transfer one 32 bit interger.
Based on this answer Difference between Hz and bps
I have divided my ...
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3
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Connecting a RJ45 MagJack
I've made a few things now using a RJ45 jack and a separate pulse transformer. To make the design smaller i'm looking to use a magjak or a RJ45 connector with the pulse transformer built in. The jack ...
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Locating the Origin of 2.4GHz RF Transmissions
Is it possible? How would it work?
Consider IEEE 802.11 (aka.Wi-Fi); for instance.
There's such an incredible amount of devices out there, measuring and reporting WLAN AP signal strength (RSSI, RCPI, ...
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can i interface profinet protocol to ethernet interface?
i have a profinet device and an Ethernet port which is dedicated for KNX protocol. can i connect my profinet device to this Ethernet port?
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CAN bus physical layer configuration for more than two devices
I am designing a CAN bus for a light electric vehicle, likely using an Arduino CAN bus shield or similar.
Using a single D-sub cable it's obvious that two devices could be connected together. The ...
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How do I fetch data from the internet with a GSM module using GPRS? [closed]
Recently I have built a device using Quectel (GSM/GPRS module) interfaced with Atmel MCU. It will control another device using SMS received by that GSM module. Now I am trying to connect it to the ...
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3
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How large of an embedded system would be needed for a small internet host? [closed]
In the "Internet of Things" there is a push to incorporate net capability on appliances and household object to make then more user friendly. If trying to make a device which can be controlled through ...
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How a modem really works? [closed]
I really searched a lot and couldn't find a detailed answer(s), what happens when the Network Interface Card sends a Ethernet frame to the modem? Does the frame directly go inside modem's cpu or ...
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How to design PoE splitter for Mode A and B
I would like to power my device via PoE, but I do not know which mode (A or B) is provided by the 802.3af power sourcing equipment (PSE). How should I design a splitter to accept both implementations:
...
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How is the capacity of link more for single network link
In networks
capacity_of_link = bandwidth*propagation_delay
My doubt is how can a same wire carry multiple signals? Is is because the wire is very long (still the wire can be either high or low). I ...
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Will having two antennae at the receiver give better reception?
I have a 300mbps router with two antennae (tp-link td-wd8968). I'm building a PC and looking for a wireless network card. I have seen seen cards with a single antenna (150mbps) and cards with two ...
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Can we consider that ethernet or RS-232 (RS-485) networks have no ground connection between the two ends of each cable?
This is for a huge home theater.
I have a power transformer that converts 380VAC between two legs of a 3-phase power system down to 230VAC, with a center-tap of the secondary being our "neutral" for ...
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Carrier Wave in Wired Data Networks
I know this must be trivial for many... Which are the main reasons why line data is not modulated/demodulated in normal enterprise wired networks (in the sense that discrete voltage levels are used)? ...
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Link integrity test pulse vs carrier signal
Ethernet uses a refinement of ALOHA, known as Carrier Sense Multiple Access (CSMA), which improves performance when there is a higher medium utilisation. When a NIC has data to transmit, the NIC first ...
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240
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Two analog power planes for same voltage
I'm designing a board with LAN8720 and LPC1768.
LPC's ADC and LAN's magnetics connections require analog 3.3V power.
Should I separate these two analog power planes with a ferrite as I separate it ...
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432
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How ADSL Demodulates (restores the order) the signal for dummies
I am not an electric engineer so sorry for questions that might miss some fundamentals.
I am trying to understand the ADSL modem. The ADSL modem sends the data over different frequencies in parallel....
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552
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Interface two Ethernet (10 Base) devices without 4 twisted pairs cable (Common ethernet cable) and 10 Base-T Filter
I'm autumn and recently working on a project that wants to connect two IC with part: ENC28J60 (that connects microcontrollers (with SPI interface) to Ethernet and LAN Networks) directly in a PCB board ...
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5k
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SFP pin requirement
I have a question regarding SFP pin requirements. The SFP pin descriptions can be found in the standard document found here.
I'm currently designing a high speed LED transmitter and PIN-TIA receiver ...
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652
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Which pins sense collisions at 100BaseT?
Background
Suppose I have the following situation...
PC with the NIC hard-coded to 100Mbps, Full-duplex
RJ45 cable, pinned EIA-568B (not that the colors in the pinout matter)
Cisco Catalyst 3560 ...
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Is USB a switched network?
I recently explained to someone why USB before 3.0 must use polling as opposed to interrupts here. Basically, from my understanding of I2C, USB is also a master slave architecture sharing a cheap 1 ...
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285
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What ultimately determines the speed of electrical media
I have heard several myths about this. Some have said "thicker wires mean faster speed" which I don't believe. Others have said different voltages and others have said higher frequencies.
Take Coax ...
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Lightweight Arduino network comms
Is there a lightweight networking framework to facilitate network communications between Ethernet/Wireless enabled Arduinos and Linux/Mac/Windows PCs?
Implementing something like being able to read ...
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Are Data Cards simply L1 (Physical Layer) Devices?
I was just wondering, how many levels of the TCP/IP (OSI) Stack reside within a modem or a 3G data card and other similar networking devices?
These devices do have a physical (MAC) address, which ...
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How to setup a development network for the ENC28J60 on XP?
I'm working on an ethernet connection with the ENC28J60. During development, I'd like to connect the chip to my computer directly (i.e. not via a gateway). This ...
user17592
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Smaller alternative to RJ45 Ethernet connector
I am trying to minimize space usage for an enclosure that holds 48 boards with a RJ45 connector for Ethernet communication on each board. The boards work well with 10BASE-T (2 pairs) connection to a ...
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Problem connecting UART Wifi Module to PC
As refereed to my old question ( Connect UART WiFi module to PC ) which has been solved that days, I have a UART Wifi module ( this one ) and unfortunately I have problem again ! The point is, this ...
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Connecting SATA to SATA [closed]
Is it possible to use the SATA interface to write data to it by PC and use the bus to transmit the data to another receiver SATA board ?
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Difference between Hz and bps
Does Hz and bps mean same? Can a signal be transferred at rate of say Mbps on a channel bandwidth of few Khz?
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difference between voice and data services?
What is the difference between the voice and date services. I have read that for voice services T1/E1 frame is used and for data services a frame with a standard header and payload nd tail is used ...
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difference between throughput and bit rate?
Throughput and Bit rate seems to have the same meaning and also have same unit of bits per second. Then what is the exact difference between throughput and bit rate?
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