{"id":8234560,"date":"2026-10-24T17:27:02","date_gmt":"2026-10-24T17:27:02","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234560"},"modified":"2026-10-24T17:29:29","modified_gmt":"2026-10-24T17:29:29","slug":"mediekonverter","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/da\/guider\/mediekonverter\/","title":{"rendered":"Mediekonverter til fiber \u2013 s\u00e5dan v\u00e6lger du den rigtige"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Mediekonverter til fiber \u2013 s\u00e5dan v\u00e6lger du den rigtige<\/h1>\n<p class=\"g-lead\">En mediekonverter forbinder kobberkabel og fiber, s\u00e5 Ethernet n\u00e5r l\u00e6ngere end 100 meter og kan klare elektriske forstyrrelser. Her gennemg\u00e5r vi singlemode og multimode, SFP, r\u00e6kkevidde, og hvad der adskiller en industriel konverter fra en kontormodel.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>Hvorfor fiber<\/b> \u2013 kobber n\u00e5r 100 meter. Fiber n\u00e5r kilometer, p\u00e5virkes ikke af elektriske forstyrrelser og giver galvanisk adskillelse.<\/li>\n<li><b>Multimode<\/b> \u2013 til kortere str\u00e6kninger inden for et anl\u00e6g: op til ca. 2 km ved 100 Mbit\/s, nogle hundrede meter ved gigabit.<\/li>\n<li><b>Singlemode<\/b> \u2013 til lange str\u00e6kninger, fra 10 km og opefter afh\u00e6ngigt af optikken.<\/li>\n<li><b>SFP-plads<\/b> \u2013 du v\u00e6lger fibertype og r\u00e6kkevidde med et udskifteligt modul.<\/li>\n<li>Begge ender skal passe sammen: fibertype, b\u00f8lgel\u00e6ngde, hastighed og stik.<\/li>\n<\/ul>\n<\/div>\n<h2>Hvad g\u00f8r en mediekonverter?<\/h2>\n<p>En mediekonverter modtager Ethernet p\u00e5 en kobberport (RJ45 eller M12) og sender den samme trafik videre som lys i en fiber. I den anden ende sidder endnu en konverter, eller en switch med fiberport, der omdanner lyset til elektriske signaler igen. Konverteren er ligeglad med protokollen: PROFINET, EtherNet\/IP, Modbus TCP, video og almindelig IT-trafik passerer u\u00e6ndret.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-mediaomvandlare-f1-da.webp\" alt=\"Et par mediekonvertere forl\u00e6nger en Ethernet-forbindelse: kobber h\u00f8jst 100 meter, fiber mellem bygning A og B, derefter kobber til et kamera, I\/O eller en PLC\" width=\"1520\" height=\"490\" loading=\"lazy\" decoding=\"async\"><figcaption>To mediekonvertere forl\u00e6nger Ethernet ud over kobberets gr\u00e6nse p\u00e5 100 meter.<\/figcaption><\/figure>\n<p>Behovet opst\u00e5r oftest, fordi en Ethernet-forbindelse i parsnoet kobberkabel er begr\u00e6nset til 100 meter. Det r\u00e6kker sj\u00e6ldent mellem to bygninger, langs et langt transportb\u00e5nd eller ud til et kamera ved indk\u00f8rslen.<\/p>\n<h2>Hvorn\u00e5r er fiber bedre end kobber?<\/h2>\n<ul>\n<li><b>Lange afstande<\/b> \u2013 forbindelser over 100 meter, mellem bygninger, i tunneler og ude i vindm\u00f8lleparker.<\/li>\n<li><b>Elektriske forstyrrelser (EMC)<\/b> \u2013 t\u00e6t p\u00e5 frekvensomformere, svejseudstyr, induktionsovne og kraftkabler. Lyset i fiberen p\u00e5virkes ikke af elektromagnetiske felter.<\/li>\n<li><b>Potentialforskelle og lynnedslag<\/b> \u2013 bygninger med forskelligt jordpotentiale kan drive str\u00f8m gennem kobberkablets sk\u00e6rm. Fiberen leder ikke str\u00f8m og giver galvanisk adskillelse mellem bygningerne.<\/li>\n<\/ul>\n<h3>Eksempler fra forskellige brancher<\/h3>\n<ul>\n<li><b>Fabrik og proces<\/b> \u2013 forbindelser mellem tavler i forskellige haller eller forbi frekvensomformere og svejserobotter.<\/li>\n<li><b>Energi<\/b> \u2013 transformerstationer og koblingsanl\u00e6g, hvor konvertere efter IEC 61850-3 t\u00e5ler det elektriske milj\u00f8. Ogs\u00e5 sol- og vindparker med lange afstande.<\/li>\n<li><b>Infrastruktur<\/b> \u2013 trafikoverv\u00e5gning, tunneler og pumpestationer. Konvertere med PoE forsyner kameraer og access points for enden af fiberen.<\/li>\n<li><b>Jernbane<\/b> \u2013 langs sporet og p\u00e5 depoter, hvor fiberen klarer lange str\u00e6kninger og forstyrrelser fra k\u00f8reledningen.<\/li>\n<li><b>K\u00f8ret\u00f8jer og forsvar<\/b> \u2013 IP67-klassificerede konvertere med milit\u00e6re stik til skibe, fly og landk\u00f8ret\u00f8jer.<\/li>\n<li><b>Hospitaler og medicoteknik<\/b> \u2013 fiber mellem bygninger og i milj\u00f8er med forstyrrelsesf\u00f8lsomt medicinsk udstyr.<\/li>\n<\/ul>\n<h2>Singlemode eller multimode?<\/h2>\n<p>Fiber findes i to hovedtyper. I multimode-fiber er kernen bred, og lyset g\u00e5r ad flere veje, hvilket begr\u00e6nser afstanden. I singlemode-fiber er kernen s\u00e5 smal, at lyset kun g\u00e5r ad \u00e9n vej, hvilket giver meget lang r\u00e6kkevidde.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-mediaomvandlare-f2-da.webp\" alt=\"Sammenligning af multimode- og singlemode-fiber: i multimode g\u00e5r lyset ad flere veje i en bred kerne, i singlemode ad \u00e9n vej i en smal kerne\" width=\"1520\" height=\"480\" loading=\"lazy\" decoding=\"async\"><figcaption>Multimode har bred kerne og flere lysveje. Singlemode har smal kerne og n\u00e5r meget l\u00e6ngere.<\/figcaption><\/figure>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th>Multimode<\/th>\n<th>Singlemode<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">Kerne<\/td>\n<td>50 eller 62,5 \u00b5m<\/td>\n<td>Ca. 9 \u00b5m<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">B\u00f8lgel\u00e6ngde<\/td>\n<td>850 og 1300 nm<\/td>\n<td>1310 og 1550 nm<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">100 Mbit\/s<\/td>\n<td>Op til ca. 2 km<\/td>\n<td>Titals kilometer<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Gigabit<\/td>\n<td>Ca. 220\u2013550 m afh\u00e6ngigt af fiber<\/td>\n<td>10 km og l\u00e6ngere afh\u00e6ngigt af modul<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Kablets farve<\/td>\n<td>Ofte orange eller turkis<\/td>\n<td>Ofte gul<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Velegnet til<\/td>\n<td>Inden for bygninger og anl\u00e6g<\/td>\n<td>Mellem bygninger og over lange str\u00e6kninger<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Tag udgangspunkt i den fiber, der allerede findes i anl\u00e6gget. Er den multimode, s\u00e5 kontroll\u00e9r kategorien (OM1\u2013OM4), fordi den p\u00e5virker r\u00e6kkevidden. Skal der tr\u00e6kkes ny fiber, er singlemode ofte det mest fremtidssikre valg.<\/p>\n<h2>SFP, stik og b\u00f8lgel\u00e6ngder<\/h2>\n<p>Mange konvertere har en SFP-plads i stedet for en fast fiberport. SFP (small form-factor pluggable) er et lille udskifteligt modul, der bestemmer fibertype, b\u00f8lgel\u00e6ngde og r\u00e6kkevidde. S\u00e5 kan du skifte fra multimode til singlemode uden at udskifte konverteren. Det mest almindelige stik p\u00e5 SFP-moduler er LC, mens faste fiberporte ofte har SC eller ST.<\/p>\n<p>Der findes ogs\u00e5 moduler til en enkelt fiber (WDM eller BiDi), der sender p\u00e5 \u00e9n b\u00f8lgel\u00e6ngde og modtager p\u00e5 en anden, for eksempel 1310 og 1550 nm. De bruges i par med modsatte b\u00f8lgel\u00e6ngder og sparer en fiber.<\/p>\n<h2>Managed eller unmanaged \u2013 og industrielle krav<\/h2>\n<p>De fleste mediekonvertere er unmanaged og virker med det samme uden indstillinger. En managed konverter kan overv\u00e5ges p\u00e5 afstand, for eksempel med SNMP eller IEEE 802.3ah OAM, og rapporterer linkstatus og fejl. Det betaler sig, n\u00e5r du har mange forbindelser, eller n\u00e5r konverteren sidder langt v\u00e6k.<\/p>\n<p>En god mellemvej er Link Fault Pass-Through (LFP). G\u00e5r fiberforbindelsen ned, lukker konverteren ogs\u00e5 kobberporten, s\u00e5 switchen ser fejlen og kan give alarm eller skifte til en reservevej.<\/p>\n<h3>Det skal en industriel konverter kunne klare<\/h3>\n<ul>\n<li><b>Temperatur<\/b> \u2013 kontormodeller er bygget til stuetemperatur. Industrielle varianter findes til \u221240 til 75 \u00b0C.<\/li>\n<li><b>Montage og forsyning<\/b> \u2013 DIN-skinne, metalkabinet og dobbelte forsyningsindgange, ofte 12\u201348 V DC.<\/li>\n<li><b>Alarm<\/b> \u2013 rel\u00e6udgang, der signalerer forsyningssvigt eller linkfejl.<\/li>\n<li><b>Godkendelser<\/b> \u2013 for eksempel IEC 61850-3 til transformerstationer, EN 50155 til jernbanek\u00f8ret\u00f8jer og Class I Division 2 eller ATEX zone 2 til eksplosionsfarlige milj\u00f8er.<\/li>\n<\/ul>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Hvis du har brug for at \u2026<\/th>\n<th>\u2026 s\u00e5 v\u00e6lg<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Forl\u00e6nge en forbindelse inden for et anl\u00e6g<\/td>\n<td>Multimode eller SFP-plads for fleksibilitet<\/td>\n<\/tr>\n<tr>\n<td>Forbinde bygninger eller steder flere kilometer v\u00e6k<\/td>\n<td>Singlemode<\/td>\n<\/tr>\n<tr>\n<td>Forsyne et kamera eller access point langt v\u00e6k<\/td>\n<td>Konverter med PoE<\/td>\n<\/tr>\n<tr>\n<td>Overv\u00e5ge mange forbindelser fra et centralt sted<\/td>\n<td>Managed konverter, gerne i rack<\/td>\n<\/tr>\n<tr>\n<td>Montere udend\u00f8rs, i k\u00f8ret\u00f8jer eller p\u00e5 skibe<\/td>\n<td>IP67-klassificeret konverter med bredt temperaturomr\u00e5de<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>Fem almindelige fejl<\/h2>\n<ol class=\"g-pit\">\n<li><b>Enderne passer ikke sammen.<\/b> Multimode i den ene ende og singlemode i den anden, forskellige b\u00f8lgel\u00e6ngder eller 100 Mbit\/s mod gigabit giver ingen forbindelse. Kontroll\u00e9r begge sider, f\u00f8r du bestiller.<\/li>\n<li><b>SFP-modulet t\u00e5ler ikke milj\u00f8et.<\/b> En konverter til \u221240 \u00b0C hj\u00e6lper ikke, hvis SFP-modulet kun er lavet til stuetemperatur. V\u00e6lg moduler med industrielt temperaturomr\u00e5de.<\/li>\n<li><b>Ingen LFP.<\/b> Uden Link Fault Pass-Through opdager switchen ikke, at fiberen er kn\u00e6kket, og redundansen skifter ikke om.<\/li>\n<li><b>Snavsede stik.<\/b> St\u00f8v og fedt p\u00e5 fiberenderne er en almindelig \u00e5rsag til d\u00e6mpning og ustabile forbindelser. Reng\u00f8r og inspic\u00e9r stikkene ved montagen.<\/li>\n<li><b>For skarpe b\u00f8jninger.<\/b> Fiber, der b\u00f8jes for h\u00e5rdt, mister lys. F\u00f8lg kabelproducentens mindste b\u00f8jeradius i kabelbakker og tavler.<\/li>\n<\/ol>\n<h2>Mediekonvertere hos SCN<\/h2>\n<p>Vi har mediekonvertere fra Moxa, ORing og Enercon: fra kompakte konvertere til DIN-skinne og indstiksmoduler til rack til IP67-klassificerede modeller til milit\u00e6re platforme. Flere f\u00e5s med PoE, SFP-plads og temperaturomr\u00e5de ned til \u221240 \u00b0C.<\/p>\n<h3>Eksempler fra vores sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/imc-101g-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/IMC-101G.jpg\" alt=\"Moxa IMC-101G Industriel Gigabit Ethernet-til-fiber-konverter\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Moxa<\/span><span class=\"g-pn\">IMC-101G Industriel Gigabit Ethernet-til-fiber-konverter<\/span><span class=\"g-pw\">Gigabit-konverter med SFP-plads, LFP, alarmrel\u00e6udgang og redundante forsyningsindgange. Modellerne -T klarer \u221240 til 75 \u00b0C.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/ipmc111pb-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/IPMC-111PB.jpg\" alt=\"ORing IPMC-111PB\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">ORing<\/span><span class=\"g-pn\">IPMC-111PB<\/span><span class=\"g-pw\">Fast Ethernet til fiber med SFP-plads og IEEE 802.3at PoE op til 30 W til \u221240 til 70 \u00b0C.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/enercon-miltech-1000-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/enercon-miltech-1000-series-main.webp\" alt=\"Enercon MILTECH 1000 milit\u00e6r Gigabit-mediekonverter\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Enercon<\/span><span class=\"g-pn\">MILTECH 1000 milit\u00e6r Gigabit-mediekonverter<\/span><span class=\"g-pw\">Robust IP67-gigabit-konverter med fiberforbindelser op til 120 km og koldstart fra \u221245 \u00b0C.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/ethernet-media-converters-da\/\">Ethernet-mediekonvertere<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/ethernet-da\/\">Ethernet-switche<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/ethernet-da\/managed-switches-da\/\">Managed switche<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/ethernet-da\/unmanaged-switches-da\/\">Unmanaged switche<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/\">Netv\u00e6rksprodukter<\/a><\/div>\n<div class=\"g-cta\">\n<p>Usikker p\u00e5 fibertype, r\u00e6kkevidde eller SFP? Fort\u00e6l vores ingeni\u00f8rer om str\u00e6kningen og milj\u00f8et \u2013 du f\u00e5r svar inden for 24 timer.<\/p>\n<p><a href=\"https:\/\/scn.eu\/da\/kontakt\/\">Sp\u00f8rg en ingeni\u00f8r<\/a><\/div>\n<h2>Ofte stillede sp\u00f8rgsm\u00e5l<\/h2>\n<details>\n<summary>Hvor langt n\u00e5r en mediekonverter?<\/summary>\n<p>Det afh\u00e6nger af fiberen og optikken. Multimode n\u00e5r fra nogle hundrede meter ved gigabit op til ca. 2 km ved 100 Mbit\/s. Singlemode n\u00e5r normalt 10 km eller mere, og visse modeller over 100 km.<\/p>\n<\/details>\n<details>\n<summary>Kan man blande singlemode og multimode?<\/summary>\n<p>Nej, begge ender af en forbindelse skal have samme fibertype og b\u00f8lgel\u00e6ngde. Skal to forskellige fibernet forbindes, kr\u00e6ver det udstyr med en port af hver slags, for eksempel en switch med to SFP-pladser.<\/p>\n<\/details>\n<details>\n<summary>Skal man altid bruge to mediekonvertere?<\/summary>\n<p>Nej. I den anden ende kan der sidde en switch eller en anden enhed med fiberport eller SFP-plads. Det vigtige er, at fibertype, b\u00f8lgel\u00e6ngde og hastighed passer sammen.<\/p>\n<\/details>\n<details>\n<summary>Hvad er forskellen p\u00e5 en mediekonverter og en switch med fiberport?<\/summary>\n<p>En mediekonverter har oftest \u00e9n kobberport og \u00e9n fiberport og tilslutter \u00e9n enhed. En switch med fiberport fordeler trafikken til flere enheder og kan have funktioner som VLAN og redundans.<\/p>\n<\/details>\n<details>\n<summary>Forsinker en mediekonverter realtidstrafik?<\/summary>\n<p>Forsinkelsen er lille, fra nogle f\u00e5 mikrosekunder op til omkring en tiendedel millisekund afh\u00e6ngigt af hastighed og rammest\u00f8rrelse. Det p\u00e5virker normalt ikke PROFINET eller EtherNet\/IP.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>En mediekonverter forbinder kobberkabel og fiber, s\u00e5 Ethernet n\u00e5r l\u00e6ngere end 100 meter og kan klare elektriske forstyrrelser. Her gennemg\u00e5r vi singlemode og multimode, SFP, r\u00e6kkevidde, og hvad der adskiller en industriel konverter fra en kontormodel.<\/p>\n","protected":false},"author":11,"featured_media":8234352,"template":"","meta":{"_yoast_wpseo_focuskw":"mediekonverter","_yoast_wpseo_metadesc":"Mediekonverter til Ethernet: hvorn\u00e5r fiber er bedre end kobber, singlemode eller multimode, SFP, r\u00e6kkevidde, og hvad industrien kr\u00e6ver.","_kad_post_transparent":"","_kad_post_title":"hide","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"hide","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","_scn_guide_cats":[872,863],"_scn_guide_sectors":[1011,1080,1012],"_scn_guide_type":"tech","_scn_guide_order":20,"footnotes":""},"class_list":["post-8234560","scn_guide","type-scn_guide","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mediekonverter til fiber \u2013 s\u00e5dan v\u00e6lger du den rigtige | SCN<\/title>\n<meta name=\"description\" content=\"Mediekonverter til Ethernet: hvorn\u00e5r fiber er bedre end kobber, singlemode eller multimode, SFP, r\u00e6kkevidde, og hvad industrien kr\u00e6ver.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scn.eu\/da\/guider\/mediekonverter\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mediekonverter til fiber \u2013 s\u00e5dan v\u00e6lger du den rigtige | SCN\" \/>\n<meta property=\"og:description\" content=\"Mediekonverter til Ethernet: hvorn\u00e5r fiber er bedre end kobber, singlemode eller multimode, SFP, r\u00e6kkevidde, og hvad industrien 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