.. pealkiri: Optilise lingi eelarve kalkulaator
.. nälkjas: optiline-link-eelarve-kalkulaator
.. kuupäev: 2026-01-10 14:00:00 UTC
.. sildid: võrk, fiiberoptiline, kalkulaator, tööriist, optiline, Ethernet
.. kategooria: Kalkulaatorid
.. link:
.. kirjeldus: Arvutage optilise lingi eelarved fiiberoptiliste juurutuste jaoks. Tehke kindlaks, kas teie kiudühendus töötab konkreetsete SFP moodulitega, analüüsides võimsuse eelarvet, sumbumist ja pistikukadusid.
.. tüüp: tekst
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<div class="calc-container">
<div class="calc-header">
<h2>Optilise lingi eelarve kalkulaator</h2>
<p>Planeerige ja kontrollige fiiberoptilisi linke, arvutades välja võimsuse eelarved, sumbumiskadud ja lingi marginaalid. Tehke kindlaks, kas teie kiudoptiline juurutus vastab konkreetsete SFP/SFP+ moodulite vastuvõtja minimaalsetele tundlikkuse nõuetele.</p>
<div class="input-grid">
<div class="input-group">
<label for="sfpModule">SFP/SFP+ mooduli tüüp:<i class="info-icon" title="Select the transceiver module you plan to use">?</i>
</label>
<select id="sfpModule" onchange="onSfpChange()">
<option value="">-- Valige moodul --</option>
<optgroup label="1 Gigabit Ethernet">
<option value="1000BASE-SX">1000BASE-SX (MMF, 850 nm, 550 m)</option>
<option value="1000BASE-LX">1000BASE-LX (SMF/MMF, 1310nm, 10km)</option>
<option value="1000BASE-ZX">1000BASE-ZX (SMF, 1550 nm, 80 km)</option>
</optgroup>
<optgroup label="10 Gigabit Ethernet">
<option value="10GBASE-SR">10GBASE-SR (MMF, 850 nm, 300 m)</option>
<option value="10GBASE-LR">10 GBASE-LR (SMF, 1310 nm, 10 km)</option>
<option value="10GBASE-ER">10GBASE-ER (SMF, 1550 nm, 40 km)</option>
<option value="10GBASE-ZR">10GBASE-ZR (SMF, 1550 nm, 80 km)</option>
</optgroup>
<optgroup label="25 Gigabit Ethernet">
<option value="25GBASE-SR">25 GBASE-SR (MMF, 850 nm, 100 m)</option>
<option value="25GBASE-LR">25 GBASE-LR (SMF, 1310 nm, 10 km)</option>
</optgroup>
<optgroup label="40 Gigabit Ethernet">
<option value="40GBASE-SR4">40GBASE-SR4 (MMF, 850 nm, 100 m)</option>
</optgroup>
<optgroup label="100 Gigabit Ethernet">
<option value="100GBASE-SR4">100GBASE-SR4 (MMF, 850nm, 100m)</option>
</optgroup>
</select>
</div>
<div class="input-group">
<label for="fiberType">Kiu tüüp:<i class="info-icon" title="Fiber cable type - automatically filtered based on SFP selection">?</i>
</label>
<select id="fiberType" onchange="onFiberChange()">
<option value="">-- Valige Fiber --</option>
<optgroup label="Single-Mode Fiber">
<option value="OS2">OS2 (ühe režiimiga, 9/125 µm)</option>
</optgroup>
<optgroup label="Multi-Mode Fiber">
<option value="OM3">OM3 (mitme režiimiga, 50/125 µm)</option>
<option value="OM4">OM4 (mitme režiimiga, 50/125 µm)</option>
<option value="OM5">OM5 (mitme režiimiga, 50/125 µm)</option>
</optgroup>
</select>
</div>
<div class="input-group">
<label for="distance">Lingi kaugus:<i class="info-icon" title="Total fiber length between transceivers">?</i>
</label>
<div class="input-row">
<input id="distance" min="0" placeholder="Enter distance" step="0.001" type="number" value="5"/>
<select id="distanceUnit">
<option value="km">Kilomeetrid</option>
<option value="m">Meetrid</option>
<option value="ft">Jalad</option>
</select>
</div>
</div>
<div class="input-group">
<label for="connectorPairs">Pistikupaarid (paigad):<i class="info-icon" title="Number of mated connector pairs (typically 2-6)">?</i>
</label>
<input id="connectorPairs" max="20" min="0" placeholder="Number of connectors" type="number" value="4"/>
</div>
</div>
<div class="advanced-toggle">
<input id="showAdvanced" onchange="toggleAdvancedOptions()" type="checkbox"/>
<label for="showAdvanced">Kuva täpsemad suvandid (liited, kohandatud veerised)</label>
</div>
<div class="advanced-options" id="advancedOptions">
<div class="input-grid">
<div class="input-group">
<label for="fusionSplices">Fusioonliitmikud:</label>
<input id="fusionSplices" max="50" min="0" placeholder="Number of fusion splices" type="number" value="0"/>
</div>
<div class="input-group">
<label for="mechanicalSplices">Mehaanilised liitmikud:</label>
<input id="mechanicalSplices" max="50" min="0" placeholder="Number of mechanical splices" type="number" value="0"/>
</div>
<div class="input-group">
<label for="connectorLoss">Pistiku kadu (dB/paar):<i class="info-icon" title="Typical: 0.5-0.75 dB per mated pair">?</i>
</label>
<input id="connectorLoss" max="3" min="0" placeholder="dB per pair" step="0.05" type="number" value="0.75"/>
</div>
<div class="input-group">
<label for="safetyMargin">Ohutusvaru (dB):<i class="info-icon" title="Accounts for aging, temperature, dirty connectors. Typical: 3 dB">?</i>
</label>
<input id="safetyMargin" max="10" min="0" placeholder="Safety margin" step="0.5" type="number" value="3"/>
</div>
</div>
</div>
<button class="calc-button" onclick="calculateLinkBudget()">Arvutage lingi eelarve</button>
</div>
<div class="result-section" id="results">
<div class="section-header" id="resultHeader">
<span>Arvutustulemused</span>
<span class="result-badge" id="resultBadge">LÄBI</span>
</div>
<div class="section-content">
<div class="summary-box" id="summaryBox">
<div class="margin-label">Lingi marginaal</div>
<div class="link-margin" id="linkMarginDisplay">+5,2 dB</div>
<div id="resultMessage" style="font-size: 16px; color: #666; margin-top: 10px;">Lingil on piisav energiaeelarve</div>
</div>
<div id="warningContainer"></div>
<h4 style="color: #555; margin-top: 20px;">Võimsuseelarve kokkuvõte</h4>
<div class="data-row">
<div class="data-label">Edastusvõimsus (Tx):</div>
<div class="data-value" id="txPower">-</div>
</div>
<div class="data-row">
<div class="data-label">Vastuvõtja tundlikkus (Rx):</div>
<div class="data-value" id="rxSensitivity">-</div>
</div>
<div class="data-row">
<div class="data-label">Saadaoleva lingi eelarve:</div>
<div class="data-value highlight" id="linkBudget">-</div>
</div>
<h4 style="color: #555; margin-top: 25px;">Kahjude jaotus</h4>
<table class="breakdown-table">
<thead>
<tr>
<th>Kaotuse komponent</th>
<th style="text-align: right;">Väärtus</th>
<th style="text-align: right;">Kadu (dB)</th>
</tr>
</thead>
<tbody id="lossBreakdown">
Asustatud JavaScriptiga
</tbody>
</table>
<div style="margin-top: 20px; text-align: center;">
<button class="copy-button" onclick="copyResults()">Kopeerige tulemused lõikelauale</button>
</div>
</div>
</div>
<div class="info-box">
<h3>Teave optilise lingi eelarve arvutamise kohta</h3>
<p>
<strong>Mis on lingi eelarve?</strong>Ühenduseelarve on kõigi fiiberoptilise ülekandesüsteemi kasumite ja kahjumite arvestus. See määrab, kas detektori optiline võimsus on usaldusväärseks andmeedastuseks piisav.</p>
<h4>Põhivalem:</h4>
<p><code>Link Margin = Link Budget - Total Loss - Safety Margin</code></p>
<p>Kus:</p>
<ul>
<li><strong>Lingi eelarve</strong>= edastusvõimsus (dBm) – vastuvõtja tundlikkus (dBm)</li>
<li><strong>Täielik kaotus</strong>= Fiber Sumbumine + Ühenduse kadu + Splaissi kadu</li>
<li><strong>Lingi marginaal</strong>= Järelejäänud võimsuse eelarve (elujõulise lingi korral peaks olema positiivne)</li>
</ul>
<h4>Kiudude sumbumise väärtused:</h4>
<ul>
<li><strong>OS2 (ühe režiimiga)</strong>: 0,4 dB/km @ 1310 nm, 0,25 dB/km @ 1550 nm</li>
<li><strong>OM3 (mitmemoodiline)</strong>: 3,0 dB/km @ 850 nm, 1,0 dB/km @ 1300 nm</li>
<li><strong>OM4 (mitmemoodiline)</strong>: 3,0 dB/km @ 850 nm, 1,0 dB/km @ 1300 nm (parem ribalaius)</li>
<li><strong>OM5 (mitmemoodiline)</strong>: 3,0 dB/km @ 850 nm (optimeeritud SWDM-i jaoks)</li>
</ul>
<h4>Tüüpilised kaotuse väärtused:</h4>
<ul>
<li><strong>Ühenduste paarid</strong>: 0,5–0,75 dB paaritatud paari kohta (SC, LC jne)</li>
<li><strong>Fusion Splices</strong>: igaüks 0,1 dB (väga väike kadu)</li>
<li><strong>Mehaanilised liitmikud</strong>: igaüks 0,3–0,5 dB (kõrgem kui fusioon)</li>
</ul>
<h4>Miks on ohutusvaru oluline:</h4>
<p>3 dB ohutusvaru hõlmab:</p>
<ul>
<li>Komponentide vananemine ja lagunemine aja jooksul</li>
<li>Laseri väljundit mõjutavad temperatuurimuutused</li>
<li>Määrdunud või saastunud pistikud</li>
<li>Kiudude paindumine või stressist tingitud kaod</li>
<li>Tootmistolerantsid ja mõõtemääramatused</li>
</ul>
<h4>Tulemuste mõistmine:</h4>
<ul>
<li><strong>PASS (roheline)</strong>: lingi veeris ≥ 0 dB. Link peaks töötama usaldusväärselt.</li>
<li><strong>HOIATUS (kollane)</strong>: lingi veeris 0 kuni -1 dB. Võib töötada, kuid riskantne. Puhastage pistikud ja testige uuesti.</li>
<li><strong>ERU (punane)</strong>: lingi veeris &lt; -1 dB. Tõenäoliselt linki ei looda või esineb vigu. Vajad teistsugust SFP-d, lühemat vahemaad või paremat kiudu.</li>
</ul>
<h4>Kauguse piirangud:</h4>
<p>Lisaks energiaeelarvele piiravad kiudühendusi ka:</p>
<ul>
<li><strong>Kromaatiline dispersioon</strong>: piirab üherežiimilisi linke suurematel kiirustel</li>
<li><strong>Modaalne dispersioon</strong>: piirab mitmerežiimilisi linke ribalaiuse alusel (MHz·km)</li>
<li><strong>IEEE standardid</strong>: määrake iga transiiveri tüübi maksimaalne vahemaa</li>
</ul>
<h4>Parimad tavad:</h4>
<ul>
<li>Puhastage pistikud alati enne testimist või kasutuselevõttu</li>
<li>Kasutage õiget painderaadiust (tavaliselt 10x kaabli läbimõõt)</li>
<li>Veenduge, et kiu tüüp vastab SFP mooduli nõuetele</li>
<li>Dokumenteerige võimsuse mõõtmised lähtetaseme võrdluseks</li>
<li>Kasutage OTDR-i pikkade või keerukate, paljude splaissidega linkide jaoks</li>
<li>Arvestage keskkonnatingimusi (temperatuur, niiskus)</li>
</ul>
<h4>Standardite viited:</h4>
<ul>
<li><strong>IEEE 802.3</strong>: kiudoptika Etherneti standardid</li>
<li><strong>TIA-568</strong>: Ärihoonete kaabeldusstandard</li>
<li><strong>ITU-T G.652</strong>: ühemoodilise kiu spetsifikatsioonid (OS2)</li>
<li><strong>IEC 60793</strong>: Optilise kiu spetsifikatsioonid</li>
</ul>
<h4>Suure kadu tõrkeotsing:</h4>
<p>Kui teie link eelarve arvutamisel ebaõnnestub, toimige järgmiselt.</p>
<ol>
<li>Puhastage kõik pistikud korralikult kiudude puhastusvahenditega</li>
<li>Kontrollige pistikuid kriimustuste või kahjustuste suhtes (kasutage kiudmikroskoopi)</li>
<li>Veenduge, et kasutatakse õiget kiutüüpi</li>
<li>Kontrollige, kas kiudkaablis pole teravaid painutusi või murdekohti</li>
<li>Katsetage üksikuid plaastrijuhtmeid, et isoleerida halvad džemprid</li>
<li>Kaaluge suurema võimsusega SFP või tundlikuma vastuvõtja kasutamist</li>
<li>Võimalusel vähendage ühenduspunktide arvu</li>
</ol>
</div>
</div>
<script>
// SFP Module Database with IEEE 802.3 specifications
const SFP_MODULES = {
    "1000BASE-SX": {
        name: "1000BASE-SX",
        speed: "1 Gbps",
        txPowerMin: -9.5,
        txPowerMax: -3.0,
        rxSensitivity: -17.0,
        wavelength: 850,
        fiberTypes: ["OM3", "OM4", "OM5"],
        maxDistance: { "OM3": 550, "OM4": 550, "OM5": 550 }, // meters
        description: "Short-reach multimode"
    },
    "1000BASE-LX": {
        name: "1000BASE-LX",
        speed: "1 Gbps",
        txPowerMin: -9.5,
        txPowerMax: -3.0,
        rxSensitivity: -19.0,
        wavelength: 1310,
        fiberTypes: ["OS2", "OM3", "OM4"],
        maxDistance: { "OS2": 10000, "OM3": 550, "OM4": 550 }, // meters
        description: "Long-reach single/multimode"
    },
    "1000BASE-ZX": {
        name: "1000BASE-ZX",
        speed: "1 Gbps",
        txPowerMin: -2.0,
        txPowerMax: 3.0,
        rxSensitivity: -23.0,
        wavelength: 1550,
        fiberTypes: ["OS2"],
        maxDistance: { "OS2": 80000 }, // meters
        description: "Extended-reach single-mode"
    },
    "10GBASE-SR": {
        name: "10GBASE-SR",
        speed: "10 Gbps",
        txPowerMin: -7.3,
        txPowerMax: -1.0,
        rxSensitivity: -11.1,
        wavelength: 850,
        fiberTypes: ["OM3", "OM4", "OM5"],
        maxDistance: { "OM3": 300, "OM4": 400, "OM5": 400 }, // meters
        description: "Short-reach multimode"
    },
    "10GBASE-LR": {
        name: "10GBASE-LR",
        speed: "10 Gbps",
        txPowerMin: -8.2,
        txPowerMax: 0.5,
        rxSensitivity: -14.4,
        wavelength: 1310,
        fiberTypes: ["OS2"],
        maxDistance: { "OS2": 10000 }, // meters
        description: "Long-reach single-mode"
    },
    "10GBASE-ER": {
        name: "10GBASE-ER",
        speed: "10 Gbps",
        txPowerMin: -4.7,
        txPowerMax: 4.0,
        rxSensitivity: -15.8,
        wavelength: 1550,
        fiberTypes: ["OS2"],
        maxDistance: { "OS2": 40000 }, // meters
        description: "Extended-reach single-mode"
    },
    "10GBASE-ZR": {
        name: "10GBASE-ZR",
        speed: "10 Gbps",
        txPowerMin: 0.0,
        txPowerMax: 4.0,
        rxSensitivity: -24.0,
        wavelength: 1550,
        fiberTypes: ["OS2"],
        maxDistance: { "OS2": 80000 }, // meters
        description: "Extended-reach single-mode"
    },
    "25GBASE-SR": {
        name: "25GBASE-SR",
        speed: "25 Gbps",
        txPowerMin: -6.0,
        txPowerMax: 2.4,
        rxSensitivity: -10.0,
        wavelength: 850,
        fiberTypes: ["OM3", "OM4", "OM5"],
        maxDistance: { "OM3": 70, "OM4": 100, "OM5": 100 }, // meters
        description: "Short-reach multimode"
    },
    "25GBASE-LR": {
        name: "25GBASE-LR",
        speed: "25 Gbps",
        txPowerMin: -6.5,
        txPowerMax: 2.4,
        rxSensitivity: -13.0,
        wavelength: 1310,
        fiberTypes: ["OS2"],
        maxDistance: { "OS2": 10000 }, // meters
        description: "Long-reach single-mode"
    },
    "40GBASE-SR4": {
        name: "40GBASE-SR4",
        speed: "40 Gbps",
        txPowerMin: -7.6,
        txPowerMax: 2.4,
        rxSensitivity: -9.9,
        wavelength: 850,
        fiberTypes: ["OM3", "OM4", "OM5"],
        maxDistance: { "OM3": 100, "OM4": 150, "OM5": 150 }, // meters
        description: "Short-reach multimode (4 lanes)"
    },
    "100GBASE-SR4": {
        name: "100GBASE-SR4",
        speed: "100 Gbps",
        txPowerMin: -7.6,
        txPowerMax: 2.4,
        rxSensitivity: -9.9,
        wavelength: 850,
        fiberTypes: ["OM3", "OM4", "OM5"],
        maxDistance: { "OM3": 70, "OM4": 100, "OM5": 150 }, // meters
        description: "Short-reach multimode (4 lanes)"
    }
};

// Fiber specifications
const FIBER_TYPES = {
    "OS2": {
        name: "OS2 (Single-mode)",
        attenuation: {
            850: 999,    // Not used at this wavelength
            1310: 0.4,   // dB/km
            1550: 0.25   // dB/km
        },
        type: "SMF"
    },
    "OM3": {
        name: "OM3 (Multi-mode)",
        attenuation: {
            850: 3.0,    // dB/km
            1310: 1.0    // dB/km
        },
        type: "MMF"
    },
    "OM4": {
        name: "OM4 (Multi-mode)",
        attenuation: {
            850: 3.0,    // dB/km
            1310: 1.0    // dB/km
        },
        type: "MMF"
    },
    "OM5": {
        name: "OM5 (Multi-mode)",
        attenuation: {
            850: 3.0,    // dB/km
            1310: 1.0    // dB/km
        },
        type: "MMF"
    }
};

// Event handlers for smart filtering
function onSfpChange() {
    const sfpSelect = document.getElementById('sfpModule');
    const fiberSelect = document.getElementById('fiberType');
    const selectedSfp = sfpSelect.value;

    if (!selectedSfp) return;

    const sfpData = SFP_MODULES[selectedSfp];
    const compatibleFibers = sfpData.fiberTypes;

    // Filter fiber options
    Array.from(fiberSelect.options).forEach(option => {
        if (option.value === "") {
            option.style.display = 'block';
            return;
        }

        if (compatibleFibers.includes(option.value)) {
            option.style.display = 'block';
        } else {
            option.style.display = 'none';
            if (option.selected) {
                fiberSelect.value = "";
            }
        }
    });

    // Auto-select first compatible fiber if none selected
    if (!fiberSelect.value && compatibleFibers.length > 0) {
        fiberSelect.value = compatibleFibers[0];
    }
}

function onFiberChange() {
    const sfpSelect = document.getElementById('sfpModule');
    const fiberSelect = document.getElementById('fiberType');
    const selectedFiber = fiberSelect.value;

    if (!selectedFiber) return;

    // Filter SFP options based on fiber compatibility
    Array.from(sfpSelect.querySelectorAll('option')).forEach(option => {
        if (option.value === "") {
            option.style.display = 'block';
            return;
        }

        const sfpData = SFP_MODULES[option.value];
        if (sfpData && sfpData.fiberTypes.includes(selectedFiber)) {
            option.style.display = 'block';
        } else {
            option.style.display = 'none';
            if (option.selected) {
                sfpSelect.value = "";
            }
        }
    });
}

function toggleAdvancedOptions() {
    const checkbox = document.getElementById('showAdvanced');
    const advancedDiv = document.getElementById('advancedOptions');

    if (checkbox.checked) {
        advancedDiv.classList.add('show');
    } else {
        advancedDiv.classList.remove('show');
    }
}

function calculateLinkBudget() {
    // Get inputs
    const sfpModule = document.getElementById('sfpModule').value;
    const fiberType = document.getElementById('fiberType').value;
    const distance = parseFloat(document.getElementById('distance').value);
    const distanceUnit = document.getElementById('distanceUnit').value;
    const connectorPairs = parseInt(document.getElementById('connectorPairs').value) || 0;

    // Advanced options
    const fusionSplices = parseInt(document.getElementById('fusionSplices').value) || 0;
    const mechanicalSplices = parseInt(document.getElementById('mechanicalSplices').value) || 0;
    const connectorLoss = parseFloat(document.getElementById('connectorLoss').value) || 0.75;
    const safetyMargin = parseFloat(document.getElementById('safetyMargin').value) || 3;

    // Validation
    if (!sfpModule || !fiberType || !distance) {
        alert('Please fill in all required fields (SFP Module, Fiber Type, and Distance)');
        return;
    }

    // Convert distance to kilometers
    let distanceKm = distance;
    if (distanceUnit === 'm') {
        distanceKm = distance / 1000;
    } else if (distanceUnit === 'ft') {
        distanceKm = distance / 3280.84;
    }

    // Get SFP and fiber data
    const sfp = SFP_MODULES[sfpModule];
    const fiber = FIBER_TYPES[fiberType];

    // Use worst-case Tx power (minimum)
    const txPower = sfp.txPowerMin;
    const rxSensitivity = sfp.rxSensitivity;

    // Get fiber attenuation for this wavelength
    const fiberAttenuation = fiber.attenuation[sfp.wavelength];

    // Calculate losses
    const fiberLoss = distanceKm * fiberAttenuation;
    const connectorLossTotal = connectorPairs * connectorLoss;
    const fusionSpliceLoss = fusionSplices * 0.1;
    const mechanicalSpliceLoss = mechanicalSplices * 0.3;

    const totalLoss = fiberLoss + connectorLossTotal + fusionSpliceLoss + mechanicalSpliceLoss;

    // Calculate link budget and margin
    const linkBudget = txPower - rxSensitivity;
    const linkMargin = linkBudget - totalLoss - safetyMargin;

    // Check distance limits
    const maxDistanceMeters = sfp.maxDistance[fiberType];
    const distanceMeters = distanceKm * 1000;
    const exceedsDistance = distanceMeters > maxDistanceMeters;

    // Display results
    displayResults(sfp, txPower, rxSensitivity, linkBudget, totalLoss, linkMargin,
                   fiberLoss, connectorLossTotal, fusionSpliceLoss, mechanicalSpliceLoss,
                   safetyMargin, distanceKm, fiberAttenuation, exceedsDistance,
                   maxDistanceMeters, distanceMeters);

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

function displayResults(sfp, txPower, rxSensitivity, linkBudget, totalLoss, linkMargin,
                       fiberLoss, connectorLoss, fusionLoss, mechanicalLoss, safetyMargin,
                       distanceKm, fiberAttenuation, exceedsDistance, maxDistanceMeters, distanceMeters) {

    // Determine pass/fail/warning
    let status = 'pass';
    let statusText = 'PASS';
    let message = 'Link has sufficient power budget and should work reliably.';

    if (linkMargin < -1) {
        status = 'fail';
        statusText = 'FAIL';
        message = 'Insufficient power budget. Link will likely not work. Consider shorter distance, better fiber, or different SFP module.';
    } else if (linkMargin < 0) {
        status = 'warning';
        statusText = 'WARNING';
        message = 'Marginal power budget. May work but risky. Clean all connectors and verify fiber quality.';
    } else if (linkMargin < 2) {
        status = 'warning';
        statusText = 'MARGINAL';
        message = 'Low power margin. Should work but little headroom for degradation. Monitor link quality.';
    }

    // Update result header
    const resultHeader = document.getElementById('resultHeader');
    resultHeader.className = 'section-header';
    if (status === 'fail') resultHeader.classList.add('fail');
    if (status === 'warning') resultHeader.classList.add('warning');

    document.getElementById('resultBadge').textContent = statusText;

    // Update summary box
    const summaryBox = document.getElementById('summaryBox');
    summaryBox.className = 'summary-box';
    if (status === 'fail') summaryBox.classList.add('fail');
    if (status === 'warning') summaryBox.classList.add('warning');

    const marginDisplay = document.getElementById('linkMarginDisplay');
    marginDisplay.className = 'link-margin';
    if (status === 'fail') marginDisplay.classList.add('fail');
    if (status === 'warning') marginDisplay.classList.add('warning');
    marginDisplay.textContent = (linkMargin >= 0 ? '+' : '') + linkMargin.toFixed(2) + ' dB';

    document.getElementById('resultMessage').textContent = message;

    // Display power budget info
    document.getElementById('txPower').textContent = txPower.toFixed(2) + ' dBm (worst-case)';
    document.getElementById('rxSensitivity').textContent = rxSensitivity.toFixed(2) + ' dBm';
    document.getElementById('linkBudget').textContent = linkBudget.toFixed(2) + ' dB';

    // Build loss breakdown table
    const lossBreakdown = document.getElementById('lossBreakdown');
    lossBreakdown.innerHTML = `
        <tr>
            <td>Fiber Attenuation</td>
            <td style="text-align: right;">${distanceKm.toFixed(3)} km × ${fiberAttenuation} dB/km</td>
            <td style="text-align: right;">${fiberLoss.toFixed(2)} dB</td>
        </tr>
        <tr>
            <td>Connector Loss</td>
            <td style="text-align: right;">${parseInt(document.getElementById('connectorPairs').value)} pairs × ${parseFloat(document.getElementById('connectorLoss').value).toFixed(2)} dB</td>
            <td style="text-align: right;">${connectorLoss.toFixed(2)} dB</td>
        </tr>
        ${fusionLoss > 0 ? `<tr>
            <td>Fusion Splices</td>
            <td style="text-align: right;">${parseInt(document.getElementById('fusionSplices').value)} × 0.1 dB</td>
            <td style="text-align: right;">${fusionLoss.toFixed(2)} dB</td>
        </tr>` : ''}
        ${mechanicalLoss > 0 ? `<tr>
            <td>Mechanical Splices</td>
            <td style="text-align: right;">${parseInt(document.getElementById('mechanicalSplices').value)} × 0.3 dB</td>
            <td style="text-align: right;">${mechanicalLoss.toFixed(2)} dB</td>
        </tr>` : ''}
        <tr class="total-row">
            <td><strong>Total Link Loss</strong></td>
            <td></td>
            <td style="text-align: right;"><strong>${totalLoss.toFixed(2)} dB</strong></td>
        </tr>
        <tr>
            <td>Safety Margin</td>
            <td style="text-align: right;">Accounts for aging, temp, contamination</td>
            <td style="text-align: right;">${safetyMargin.toFixed(1)} dB</td>
        </tr>
        <tr class="total-row" style="background: ${linkMargin >= 0 ? '#d4edda' : '#f8d7da'};">
            <td><strong>Link Margin</strong></td>
            <td style="text-align: right;"><strong>Budget - Loss - Margin</strong></td>
            <td style="text-align: right;"><strong>${linkMargin >= 0 ? '+' : ''}${linkMargin.toFixed(2)} dB</strong></td>
        </tr>
    `;

    // Distance warning
    const warningContainer = document.getElementById('warningContainer');
    if (exceedsDistance) {
        warningContainer.innerHTML = `
            <div class="warning-message">
                <strong>⚠️ Distance Warning:</strong> Your specified distance of ${distanceMeters.toFixed(0)} meters exceeds the IEEE 802.3 maximum of ${maxDistanceMeters} meters for ${sfp.name} on this fiber type. Link may experience bit errors or fail to establish due to dispersion, even if power budget is sufficient.
            </div>
        `;
    } else {
        warningContainer.innerHTML = '';
    }

    // Show results
    document.getElementById('results').classList.add('show');
}

function copyResults() {
    const sfpModule = document.getElementById('sfpModule').value;
    const fiberType = document.getElementById('fiberType').value;
    const distance = document.getElementById('distance').value;
    const distanceUnit = document.getElementById('distanceUnit').value;
    const linkMargin = document.getElementById('linkMarginDisplay').textContent;
    const txPower = document.getElementById('txPower').textContent;
    const rxSensitivity = document.getElementById('rxSensitivity').textContent;
    const linkBudget = document.getElementById('linkBudget').textContent;
    const resultMessage = document.getElementById('resultMessage').textContent;

    const text = `Optical Link Budget Calculation Results
========================================

Configuration:
- SFP Module: ${SFP_MODULES[sfpModule].name} (${SFP_MODULES[sfpModule].speed})
- Fiber Type: ${FIBER_TYPES[fiberType].name}
- Distance: ${distance} ${distanceUnit}

Power Budget:
- Tx Power: ${txPower}
- Rx Sensitivity: ${rxSensitivity}
- Link Budget: ${linkBudget}

Result:
- Link Margin: ${linkMargin}
- Status: ${resultMessage}

Generated by baud9600.com Optical Link Budget Calculator`;

    if (navigator.clipboard && navigator.clipboard.writeText) {
        navigator.clipboard.writeText(text).then(() => {
            const button = event.target;
            const originalText = button.textContent;
            button.textContent = 'Copied!';
            button.classList.add('copied');
            setTimeout(() => {
                button.textContent = originalText;
                button.classList.remove('copied');
            }, 2000);
        });
    } else {
        alert('Copy to clipboard not supported in this browser');
    }
}

// Add Enter key support
document.addEventListener('DOMContentLoaded', function() {
    const inputs = ['distance', 'connectorPairs', 'fusionSplices', 'mechanicalSplices'];
    inputs.forEach(id => {
        const element = document.getElementById(id);
        if (element) {
            element.addEventListener('keypress', function(e) {
                if (e.key === 'Enter') {
                    calculateLinkBudget();
                }
            });
        }
    });
});
</script>