{"id":8234109,"date":"2026-10-24T17:27:02","date_gmt":"2026-10-24T17:27:02","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234109"},"modified":"2026-10-24T17:32:48","modified_gmt":"2026-10-24T17:32:48","slug":"mediaomvandlare","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/sv\/guider\/mediaomvandlare\/","title":{"rendered":"Mediaomvandlare f\u00f6r fiber \u2013 s\u00e5 v\u00e4ljer du r\u00e4tt"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Mediaomvandlare f\u00f6r fiber \u2013 s\u00e5 v\u00e4ljer du r\u00e4tt<\/h1>\n<p class=\"g-lead\">En mediaomvandlare kopplar ihop kopparkabel och fiber, s\u00e5 att Ethernet n\u00e5r l\u00e4ngre \u00e4n 100 meter och klarar elektriska st\u00f6rningar. H\u00e4r g\u00e5r vi igenom singlemode och multimode, SFP, r\u00e4ckvidd och vad som skiljer en industriell omvandlare fr\u00e5n en kontorsmodell.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>Varf\u00f6r fiber<\/b> \u2013 koppar n\u00e5r 100 meter. Fiber n\u00e5r kilometer, p\u00e5verkas inte av elektriska st\u00f6rningar och ger galvanisk isolation.<\/li>\n<li><b>Multimode<\/b> \u2013 f\u00f6r kortare str\u00e4ckor inom en anl\u00e4ggning: upp till cirka 2 km vid 100 Mbit\/s, n\u00e5gra hundra meter vid gigabit.<\/li>\n<li><b>Singlemode<\/b> \u2013 f\u00f6r l\u00e5nga str\u00e4ckor, fr\u00e5n 10 km och upp\u00e5t beroende p\u00e5 optiken.<\/li>\n<li><b>SFP-plats<\/b> \u2013 du v\u00e4ljer fibertyp och r\u00e4ckvidd med en utbytbar modul.<\/li>\n<li>B\u00e5da \u00e4ndarna m\u00e5ste matcha: fibertyp, v\u00e5gl\u00e4ngd, hastighet och kontakt.<\/li>\n<\/ul>\n<\/div>\n<h2>Vad g\u00f6r en mediaomvandlare?<\/h2>\n<p>En mediaomvandlare tar emot Ethernet p\u00e5 en kopparport (RJ45 eller M12) och skickar samma trafik vidare som ljus i en fiber. I andra \u00e4nden sitter en omvandlare till, eller en switch med fiberport, som g\u00f6r om ljuset till elektriska signaler igen. Omvandlaren bryr sig inte om protokollet: PROFINET, EtherNet\/IP, Modbus TCP, video och vanlig IT-trafik passerar of\u00f6r\u00e4ndrade.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-mediaomvandlare-f1-sv.webp\" alt=\"Ett par mediaomvandlare f\u00f6rl\u00e4nger en Ethernet-l\u00e4nk: koppar h\u00f6gst 100 meter, fiber mellan byggnad A och B, sedan koppar till en kamera, I\/O eller PLC\" width=\"1520\" height=\"490\" loading=\"lazy\" decoding=\"async\"><figcaption>Tv\u00e5 mediaomvandlare f\u00f6rl\u00e4nger Ethernet f\u00f6rbi kopparns gr\u00e4ns p\u00e5 100 meter.<\/figcaption><\/figure>\n<p>Behovet uppst\u00e5r oftast eftersom en Ethernet-l\u00e4nk i partvinnad kopparkabel \u00e4r begr\u00e4nsad till 100 meter. Det r\u00e4cker s\u00e4llan mellan tv\u00e5 byggnader, l\u00e4ngs ett l\u00e5ngt transportband eller ut till en kamera vid infarten.<\/p>\n<h2>N\u00e4r beh\u00f6vs fiber i st\u00e4llet f\u00f6r koppar?<\/h2>\n<ul>\n<li><b>L\u00e5nga avst\u00e5nd<\/b> \u2013 l\u00e4nkar \u00f6ver 100 meter, mellan byggnader, i tunnlar och ute i vindkraftsparker.<\/li>\n<li><b>Elektriska st\u00f6rningar (EMC)<\/b> \u2013 n\u00e4ra frekvensomriktare, svetsutrustning, induktionsugnar och kraftkablar. Ljuset i fibern p\u00e5verkas inte av elektromagnetiska f\u00e4lt.<\/li>\n<li><b>Potentialskillnader och \u00e5ska<\/b> \u2013 byggnader med olika jordpotential kan driva str\u00f6m genom kopparkabelns sk\u00e4rm. Fibern leder inte str\u00f6m och ger galvanisk isolation mellan byggnaderna.<\/li>\n<\/ul>\n<h3>Exempel fr\u00e5n olika branscher<\/h3>\n<ul>\n<li><b>Fabrik och process<\/b> \u2013 l\u00e4nkar mellan elsk\u00e5p i olika hallar, eller f\u00f6rbi frekvensomriktare och svetsrobotar.<\/li>\n<li><b>Energi<\/b> \u2013 elstationer och st\u00e4llverk, d\u00e4r omvandlare enligt IEC 61850-3 t\u00e5l den elektriska milj\u00f6n. \u00c4ven sol- och vindparker med l\u00e5nga avst\u00e5nd.<\/li>\n<li><b>Infrastruktur<\/b> \u2013 trafik\u00f6vervakning, tunnlar och pumpstationer. Omvandlare med PoE matar kameror och accesspunkter i fiberns \u00e4nde.<\/li>\n<li><b>J\u00e4rnv\u00e4g<\/b> \u2013 l\u00e4ngs sp\u00e5ret och i dep\u00e5er, d\u00e4r fibern klarar l\u00e5nga str\u00e4ckor och st\u00f6rningar fr\u00e5n kontaktledningen.<\/li>\n<li><b>Fordon och f\u00f6rsvar<\/b> \u2013 IP67-klassade omvandlare med milit\u00e4ra kontaktdon f\u00f6r fartyg, flygplan och markfordon.<\/li>\n<li><b>Sjukhus och medicinteknik<\/b> \u2013 fiber mellan byggnader och i milj\u00f6er med st\u00f6rningsk\u00e4nslig medicinsk utrustning.<\/li>\n<\/ul>\n<h2>Singlemode eller multimode?<\/h2>\n<p>Fiber finns i tv\u00e5 huvudtyper. I multimodefiber \u00e4r k\u00e4rnan bred och ljuset g\u00e5r l\u00e4ngs flera v\u00e4gar, vilket begr\u00e4nsar avst\u00e5ndet. I singlemodefiber \u00e4r k\u00e4rnan s\u00e5 smal att ljuset bara g\u00e5r en v\u00e4g, vilket ger mycket l\u00e5ng r\u00e4ckvidd.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-mediaomvandlare-f2-sv-1.webp\" alt=\"J\u00e4mf\u00f6relse av multimode- och singlemodefiber: i multimode g\u00e5r ljuset flera v\u00e4gar i en bred k\u00e4rna, i singlemode en v\u00e4g i en smal k\u00e4rna\" width=\"1520\" height=\"480\" loading=\"lazy\" decoding=\"async\"><figcaption>Multimode har bred k\u00e4rna och flera ljusv\u00e4gar. Singlemode har smal k\u00e4rna och n\u00e5r mycket l\u00e4ngre.<\/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\">K\u00e4rna<\/td>\n<td>50 eller 62,5 \u00b5m<\/td>\n<td>Cirka 9 \u00b5m<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">V\u00e5gl\u00e4ngd<\/td>\n<td>850 och 1300 nm<\/td>\n<td>1310 och 1550 nm<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">100 Mbit\/s<\/td>\n<td>Upp till cirka 2 km<\/td>\n<td>Tiotals kilometer<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Gigabit<\/td>\n<td>Cirka 220\u2013550 m beroende p\u00e5 fiber<\/td>\n<td>10 km och l\u00e4ngre beroende p\u00e5 modul<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Kabelns f\u00e4rg<\/td>\n<td>Ofta orange eller turkos<\/td>\n<td>Ofta gul<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Passar f\u00f6r<\/td>\n<td>Inom byggnader och anl\u00e4ggningar<\/td>\n<td>Mellan byggnader och \u00f6ver l\u00e5nga str\u00e4ckor<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Utg\u00e5 fr\u00e5n fibern som redan finns i anl\u00e4ggningen. \u00c4r den multimode, kontrollera kategorin (OM1\u2013OM4) eftersom den p\u00e5verkar r\u00e4ckvidden. Ska ny fiber dras \u00e4r singlemode ofta det mest framtidss\u00e4kra valet.<\/p>\n<h2>SFP, kontakter och v\u00e5gl\u00e4ngder<\/h2>\n<p>M\u00e5nga omvandlare har en SFP-plats i st\u00e4llet f\u00f6r en fast fiberport. SFP (small form-factor pluggable) \u00e4r en liten utbytbar modul som avg\u00f6r fibertyp, v\u00e5gl\u00e4ngd och r\u00e4ckvidd. D\u00e5 kan du g\u00e5 fr\u00e5n multimode till singlemode utan att byta omvandlare. Den vanligaste kontakten p\u00e5 SFP-moduler \u00e4r LC, medan fasta fiberportar ofta har SC eller ST.<\/p>\n<p>Det finns ocks\u00e5 moduler f\u00f6r en enda fiber (WDM eller BiDi) som s\u00e4nder p\u00e5 en v\u00e5gl\u00e4ngd och tar emot p\u00e5 en annan, till exempel 1310 och 1550 nm. De anv\u00e4nds i par med omv\u00e4nda v\u00e5gl\u00e4ngder och sparar en fiber.<\/p>\n<h2>Managed eller unmanaged \u2013 och industriella krav<\/h2>\n<p>De flesta mediaomvandlare \u00e4r unmanaged och fungerar direkt utan inst\u00e4llningar. En managed omvandlare kan \u00f6vervakas p\u00e5 distans, till exempel med SNMP eller IEEE 802.3ah OAM, och rapporterar l\u00e4nkstatus och fel. Det l\u00f6nar sig n\u00e4r du har m\u00e5nga l\u00e4nkar eller n\u00e4r omvandlaren sitter l\u00e5ngt bort.<\/p>\n<p>Ett bra mellanl\u00e4ge \u00e4r Link Fault Pass-Through (LFP). G\u00e5r fiberl\u00e4nken ner st\u00e4nger omvandlaren ocks\u00e5 kopparporten, s\u00e5 att switchen ser felet och kan larma eller koppla om till en reservv\u00e4g.<\/p>\n<h3>Det h\u00e4r ska en industriell omvandlare klara<\/h3>\n<ul>\n<li><b>Temperatur<\/b> \u2013 kontorsmodeller \u00e4r byggda f\u00f6r rumstemperatur. Industriella varianter finns f\u00f6r \u221240 till 75 \u00b0C.<\/li>\n<li><b>Montering och matning<\/b> \u2013 DIN-skena, metallh\u00f6lje och dubbla matningsing\u00e5ngar, ofta 12\u201348 V DC.<\/li>\n<li><b>Larm<\/b> \u2013 rel\u00e4utg\u00e5ng som signalerar matningsbortfall eller l\u00e4nkfel.<\/li>\n<li><b>Godk\u00e4nnanden<\/b> \u2013 till exempel IEC 61850-3 f\u00f6r elstationer, EN 50155 f\u00f6r j\u00e4rnv\u00e4gsfordon och Class I Division 2 eller ATEX zon 2 f\u00f6r explosionsfarlig milj\u00f6.<\/li>\n<\/ul>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Om du beh\u00f6ver \u2026<\/th>\n<th>\u2026 v\u00e4lj<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>F\u00f6rl\u00e4nga en l\u00e4nk inom en anl\u00e4ggning<\/td>\n<td>Multimode, eller SFP-plats f\u00f6r flexibilitet<\/td>\n<\/tr>\n<tr>\n<td>Koppla ihop byggnader eller platser flera kilometer bort<\/td>\n<td>Singlemode<\/td>\n<\/tr>\n<tr>\n<td>Mata en kamera eller accesspunkt l\u00e5ngt bort<\/td>\n<td>Omvandlare med PoE<\/td>\n<\/tr>\n<tr>\n<td>\u00d6vervaka m\u00e5nga l\u00e4nkar fr\u00e5n en central plats<\/td>\n<td>Managed omvandlare, g\u00e4rna i rack<\/td>\n<\/tr>\n<tr>\n<td>Montera utomhus, i fordon eller p\u00e5 fartyg<\/td>\n<td>IP67-klassad omvandlare med brett temperaturomr\u00e5de<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>Fem vanliga misstag<\/h2>\n<ol class=\"g-pit\">\n<li><b>\u00c4ndarna matchar inte.<\/b> Multimode i ena \u00e4nden och singlemode i den andra, olika v\u00e5gl\u00e4ngder eller 100 Mbit\/s mot gigabit ger ingen l\u00e4nk. Kontrollera b\u00e5da sidor innan du best\u00e4ller.<\/li>\n<li><b>SFP-modulen t\u00e5l inte milj\u00f6n.<\/b> En omvandlare f\u00f6r \u221240 \u00b0C hj\u00e4lper inte om SFP-modulen bara \u00e4r gjord f\u00f6r rumstemperatur. V\u00e4lj moduler med industriellt temperaturomr\u00e5de.<\/li>\n<li><b>Ingen LFP.<\/b> Utan Link Fault Pass-Through m\u00e4rker switchen inte att fibern har g\u00e5tt av, och redundansen kopplar inte om.<\/li>\n<li><b>Smutsiga kontakter.<\/b> Damm och fett p\u00e5 fiber\u00e4ndarna \u00e4r en vanlig orsak till d\u00e4mpning och instabila l\u00e4nkar. Reng\u00f6r och inspektera kontakterna vid montering.<\/li>\n<li><b>F\u00f6r sn\u00e4va b\u00f6jar.<\/b> Fiber som b\u00f6js f\u00f6r h\u00e5rt f\u00f6rlorar ljus. F\u00f6lj kabeltillverkarens minsta b\u00f6jradie i kabelstegar och sk\u00e5p.<\/li>\n<\/ol>\n<h2>Mediaomvandlare hos SCN<\/h2>\n<p>Vi har mediaomvandlare fr\u00e5n Moxa, ORing och Enercon: fr\u00e5n kompakta omvandlare f\u00f6r DIN-skena och insticksmoduler f\u00f6r rack till IP67-klassade modeller f\u00f6r milit\u00e4ra plattformar. Flera finns med PoE, SFP-plats och temperaturomr\u00e5de ned till \u221240 \u00b0C.<\/p>\n<h3>Exempel ur v\u00e5rt sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/imc-101g-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/IMC-101G.jpg\" alt=\"Moxa IMC-101G Industriell Gigabit Ethernet-till-fiber-konverterare\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Moxa<\/span><span class=\"g-pn\">IMC-101G Industriell Gigabit Ethernet-till-fiber-konverterare<\/span><span class=\"g-pw\">Gigabitomvandlare med SFP-plats, LFP, larm via rel\u00e4utg\u00e5ng och dubbla matningsing\u00e5ngar. -T-modellerna klarar \u221240 till 75 \u00b0C.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/ipmc111pb-sv\/\"><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 till fiber med SFP-plats och PoE enligt IEEE 802.3at, upp till 30 W, f\u00f6r \u221240 till 70 \u00b0C.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/enercon-miltech-1000-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/enercon-miltech-1000-series-main.webp\" alt=\"Enercon MILTECH 1000 milit\u00e4r Gigabit-mediakonverterare\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Enercon<\/span><span class=\"g-pn\">MILTECH 1000 milit\u00e4r Gigabit-mediakonverterare<\/span><span class=\"g-pw\">Robust gigabitomvandlare i IP67 med fiberl\u00e4nkar upp till 120 km och kallstart fr\u00e5n \u221245 \u00b0C.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/network-products-sv\/ethernet-media-converters-sv\/\">Mediaomvandlare f\u00f6r Ethernet<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/network-products-sv\/ethernet-sv\/\">N\u00e4tverksswitchar<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/network-products-sv\/ethernet-sv\/managed-switches-sv\/\">Managerade switchar<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/network-products-sv\/ethernet-sv\/unmanaged-switches-sv\/\">Omanagerade switchar<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/network-products-sv\/\">N\u00e4tverksprodukter<\/a><\/div>\n<div class=\"g-cta\">\n<p>Os\u00e4ker p\u00e5 fibertyp, r\u00e4ckvidd eller SFP? Ber\u00e4tta om str\u00e4ckan och milj\u00f6n f\u00f6r v\u00e5ra ingenj\u00f6rer \u2013 du f\u00e5r svar inom 24 timmar.<\/p>\n<p><a href=\"https:\/\/scn.eu\/sv\/kontakt\/\">Fr\u00e5ga en ingenj\u00f6r<\/a><\/div>\n<h2>Vanliga fr\u00e5gor<\/h2>\n<details>\n<summary>Hur l\u00e5ngt n\u00e5r en mediaomvandlare?<\/summary>\n<p>Det beror p\u00e5 fibern och optiken. Multimode n\u00e5r fr\u00e5n n\u00e5gra hundra meter vid gigabit upp till cirka 2 km vid 100 Mbit\/s. Singlemode n\u00e5r normalt 10 km eller mer, och vissa modeller \u00f6ver 100 km.<\/p>\n<\/details>\n<details>\n<summary>Kan man blanda singlemode och multimode?<\/summary>\n<p>Nej, b\u00e5da \u00e4ndarna av en l\u00e4nk m\u00e5ste ha samma fibertyp och v\u00e5gl\u00e4ngd. Ska tv\u00e5 olika fibern\u00e4t kopplas ihop beh\u00f6vs utrustning med en port av varje sort, till exempel en switch med tv\u00e5 SFP-platser.<\/p>\n<\/details>\n<details>\n<summary>Beh\u00f6ver man alltid tv\u00e5 mediaomvandlare?<\/summary>\n<p>Nej. I andra \u00e4nden kan det sitta en switch eller annan enhet med fiberport eller SFP-plats. Det viktiga \u00e4r att fibertyp, v\u00e5gl\u00e4ngd och hastighet matchar.<\/p>\n<\/details>\n<details>\n<summary>Vad \u00e4r skillnaden mellan en mediaomvandlare och en switch med fiberport?<\/summary>\n<p>En mediaomvandlare har oftast en kopparport och en fiberport och ansluter en enhet. En switch med fiberport f\u00f6rdelar trafiken till flera enheter och kan ha funktioner som VLAN och redundans.<\/p>\n<\/details>\n<details>\n<summary>F\u00f6rdr\u00f6jer en mediaomvandlare realtidstrafik?<\/summary>\n<p>F\u00f6rdr\u00f6jningen \u00e4r liten, fr\u00e5n n\u00e5gra mikrosekunder upp till ungef\u00e4r en tiondels millisekund beroende p\u00e5 hastighet och ramstorlek. Det p\u00e5verkar normalt inte PROFINET eller EtherNet\/IP.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>En mediaomvandlare kopplar ihop kopparkabel och fiber, s\u00e5 att Ethernet n\u00e5r l\u00e4ngre \u00e4n 100 meter och klarar elektriska st\u00f6rningar. H\u00e4r g\u00e5r vi igenom singlemode och multimode, SFP, r\u00e4ckvidd och vad som skiljer en industriell omvandlare fr\u00e5n en kontorsmodell.<\/p>\n","protected":false},"author":11,"featured_media":8234058,"template":"","meta":{"_yoast_wpseo_focuskw":"mediaomvandlare","_yoast_wpseo_metadesc":"Mediaomvandlare f\u00f6r Ethernet: n\u00e4r fiber beh\u00f6vs i st\u00e4llet f\u00f6r koppar, singlemode eller multimode, SFP, r\u00e4ckvidd och vad industrin 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