---
title: "processing time from send() to TXON, TXOP pin to start the transmission?"
url: "https://maker.wiznet.io/forum/14482"
markdown_url: "https://maker.wiznet.io/forum/14482/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "kkumuk1"
created: "2022-02-23T05:50:58+09:00"
last_activity: "2022-02-23T05:50:58+09:00"
language: "en"
views: 367
replies: 0
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# processing time from send() to TXON, TXOP pin to start the transmission?

## Question

Asked by kkumuk1 on 2022-02-23 in Ethernet Chips.

1. How long will it take from the send() function to the TXON, TXOP pin to start the transmission?
   (I think it’s always less than 1ms. Is that right?)

2. Does the ACTn pin change its state as soon as the transmission starts physically?
   (If the time mentioned above is irregular or changes a lot, I wanna use a scope.)

3. Is it the same for receiving?

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Source: https://maker.wiznet.io/forum/14482