..标题：最大以太网 TCP 吞吐量计算器
.. slug：最大以太网 TCP 吞吐量
.. 日期: 2025-12-26 15:00:00 世界标准时间
..标签：网络、计算器、工具
..类别：
..链接：
.. 描述：计算最大 TCP 吞吐量，考虑以太网帧开销、TCP 窗口大小和网络延迟
..类型：文本
<style>
    .calc-container {
        max-width: 900px;
        margin: 20px auto;
        padding: 20px;
    }

    .calc-header {
        margin-bottom: 30px;
        padding: 25px;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        border-radius: 12px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        color: white;
    }

    .calc-header h2 {
        margin-top: 0;
        color: white;
        font-size: 28px;
        margin-bottom: 10px;
    }

    .calc-header p {
        margin: 10px 0;
        opacity: 0.95;
        font-size: 15px;
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    .input-section {
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    .input-group {
        margin-bottom: 15px;
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        display: block;
        margin-bottom: 8px;
        font-weight: 600;
        color: white;
        font-size: 14px;
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    .input-group input,
    .input-group select {
        width: 100%;
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        font-size: 16px;
        border: 2px solid rgba(255,255,255,0.3);
        border-radius: 6px;
        background: rgba(255,255,255,0.95);
        transition: all 0.3s ease;
        box-sizing: border-box;
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    .input-group select:focus {
        outline: none;
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        box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
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    .input-group input {
        font-family: 'Courier New', monospace;
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        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 15px;
        margin-bottom: 20px;
    }

    .calculate-btn {
        padding: 14px 35px;
        font-size: 16px;
        background: #4CAF50;
        color: white;
        border: none;
        border-radius: 6px;
        cursor: pointer;
        font-weight: bold;
        transition: all 0.3s ease;
        box-shadow: 0 2px 4px rgba(0,0,0,0.2);
        width: 100%;
        margin-top: 10px;
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    .calculate-btn:hover {
        background: #45a049;
        transform: translateY(-1px);
        box-shadow: 0 4px 8px rgba(0,0,0,0.3);
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    .calculate-btn:active {
        background: #3d8b40;
        transform: translateY(0);
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    .result-section {
        background: white;
        border: 1px solid #e0e0e0;
        border-radius: 8px;
        margin-top: 20px;
        overflow: hidden;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
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</style>
<div class="calc-container">
<div class="calc-header">
<h2>最大以太网 TCP 吞吐量计算器</h2>
<p>计算以太网上可实现的最大 TCP 吞吐量，考虑帧开销、TCP 窗口大小和网络延迟。</p>
<div class="input-section">
<div class="input-group">
<label for="linkspeed">链接速度：</label>
<select id="linkspeed">
<option value="10">以太网（10 Mbps）</option>
<option value="100">快速以太网 (100 Mbps)</option>
<option selected="" value="1000">千兆位以太网 (1000 Mbps)</option>
<option value="10000">10 Gb 以太网 (10 Gbps)</option>
<option value="40000">40 吉位以太网 (40 Gbps)</option>
<option value="100000">100 Gb 以太网 (100 Gbps)</option>
</select>
</div>
<div class="input-row">
<div class="input-group">
<label for="tcpwindow">TCP 窗口大小（字节）：</label>
<input id="tcpwindow" placeholder="e.g., 65536" type="text" value="65536"/>
</div>
<div class="input-group">
<label for="latency">延迟（毫秒）：</label>
<input id="latency" placeholder="e.g., 1" type="text" value="1"/>
</div>
<div class="input-group">
<label for="frame">以太网帧大小（字节）：</label>
<input id="frame" placeholder="e.g., 1500" type="text" value="1500"/>
</div>
</div>
<button class="calculate-btn" onclick="maxEthernetTCPThroughput()">计算吞吐量</button>
</div>
<div class="info-box">
<strong>关于此计算器：</strong>
<ul>
<li><strong>TCP 窗口大小：</strong>接收窗口大小（以字节为单位）（典型：64KB-16MB）</li>
<li><strong>延迟：</strong>往返时间 (RTT)（以毫秒为单位）</li>
<li><strong>框架尺寸：</strong>最大传输单元 (MTU)，通常为 1500 字节</li>
<li><strong>开销：</strong>包括以太网前导码 (8B)、帧间间隙 (12B)、标头 (38B)、IP (40B) 和 TCP (24B)</li>
</ul>
</div>
</div>
<div class="result-section" id="resultSection">
<div class="section-header">
<span class="icon">📊</span>
<span>计算结果</span>
</div>
<div class="section-content">
<div class="data-row">
<div class="data-label">最大 TCP 吞吐量：</div>
<div class="data-value highlight" id="throughputKbps"></div>
</div>
<div class="data-row">
<div class="data-label">吞吐量（Mbps）：</div>
<div class="data-value" id="throughputMbps"></div>
</div>
<div class="data-row">
<div class="data-label">吞吐量（Gbps）：</div>
<div class="data-value" id="throughputGbps"></div>
</div>
<div class="data-row">
<div class="data-label">链接速度：</div>
<div class="data-value" id="linkSpeedDisplay"></div>
</div>
<div class="data-row">
<div class="data-label">TCP 窗口大小：</div>
<div class="data-value" id="tcpWindowDisplay"></div>
</div>
<div class="data-row">
<div class="data-label">网络延迟 (RTT)：</div>
<div class="data-value" id="latencyDisplay"></div>
</div>
<div class="data-row">
<div class="data-label">以太网帧大小：</div>
<div class="data-value" id="frameDisplay"></div>
</div>
<div class="data-row">
<div class="data-label">每帧可用数据：</div>
<div class="data-value" id="usableDataDisplay"></div>
</div>
<div class="data-row">
<div class="data-label">效率：</div>
<div class="data-value" id="efficiencyDisplay"></div>
</div>
</div>
</div>
</div>
<script>
function maxEthernetTCPThroughput() {
    // Set variables from input
    var linkSpeed = Number(document.getElementById("linkspeed").value);
    var tcpwindow = document.getElementById("tcpwindow").value;
    var latency = document.getElementById("latency").value;
    var dataFramesize = Number(document.getElementById("frame").value);

    // Convert Link Speed from Mbps to Bps
    var linkSpeedBps = linkSpeed * 1000000;

    // Convert TCP Window from Bytes to Bits
    var tcpwindowbits = tcpwindow*8;

    // Calculate Usable Frame Space
    var framePreamble = 8;
    var frameGap = 12;
    var totalFrame = dataFramesize + framePreamble + frameGap;
    var ethernetOverhead = 38;
    var ethernetData = totalFrame - ethernetOverhead;
    var ipOverhead = 40;
    var tcpOverhead = 24;
    var maxData = ethernetData - ipOverhead - tcpOverhead;

    // Calculate Transfer Speed
    var transferSpeed = tcpwindowbits / ((tcpwindowbits / linkSpeedBps)*(totalFrame/maxData)+latency/1000)/1000;

    // Calculate efficiency
    var efficiency = ((maxData / totalFrame) * 100).toFixed(2);

    // Display results
    document.getElementById("throughputKbps").innerHTML = transferSpeed.toFixed(2) + " Kbps";
    document.getElementById("throughputMbps").innerHTML = (transferSpeed / 1000).toFixed(2) + " Mbps";
    document.getElementById("throughputGbps").innerHTML = (transferSpeed / 1000000).toFixed(4) + " Gbps";

    // Display input parameters
    var linkSpeedName = document.getElementById("linkspeed").options[document.getElementById("linkspeed").selectedIndex].text;
    document.getElementById("linkSpeedDisplay").innerHTML = linkSpeedName;
    document.getElementById("tcpWindowDisplay").innerHTML = Number(tcpwindow).toLocaleString() + " bytes (" + (tcpwindow/1024).toFixed(2) + " KB)";
    document.getElementById("latencyDisplay").innerHTML = latency + " ms";
    document.getElementById("frameDisplay").innerHTML = dataFramesize + " bytes (MTU)";
    document.getElementById("usableDataDisplay").innerHTML = maxData + " bytes per frame (" + totalFrame + " bytes total)";
    document.getElementById("efficiencyDisplay").innerHTML = efficiency + "% (" + maxData + "/" + totalFrame + " bytes)";

    // Show results section
    document.getElementById("resultSection").classList.add("show");

    // Scroll to results
    document.getElementById("resultSection").scrollIntoView({ behavior: 'smooth', block: 'start' });
}

// Add enter key support for inputs
document.addEventListener('DOMContentLoaded', function() {
    var inputs = ['tcpwindow', 'latency', 'frame'];
    inputs.forEach(function(id) {
        document.getElementById(id).addEventListener('keypress', function(e) {
            if (e.key === 'Enter') {
                maxEthernetTCPThroughput();
            }
        });
    });
});
</script>