Short answer: if the problem is distance, you need a media converter; if the problem is connecting several devices, you need a switch. A media converter takes one copper Ethernet segment and carries it over fiber, so a run that is longer than 100 m arrives at the other end as if it were local. A switch gives you more ports and moves traffic between them. Most real networks use both — a converter at each end of the long link, and a switch where the devices actually are. This guide covers what each device does, three projects where a converter is the right buy (a 2 km link between factory buildings, an elevator camera, and a cell-site backhaul), and a selection table for single-mode versus multimode, speed, wavelength and the optical module.
1. The one-sentence answer, and why it is not either/or
The confusion comes from the fact that both devices have an RJ45 socket on them, so on a datasheet they look interchangeable. They are not: they solve different problems, and the numbers that decide between them are the length of the run and the number of devices at the far end.
What a media converter actually does
A media converter takes the Ethernet signal off a copper cable, puts it onto a fiber strand, and does the reverse at the other end. Nothing is switched and nothing is configured — the two ends simply behave as one continuous cable. That is why it is the right tool for a single long run: it does not care how many devices are behind it, because it does not know there are any.
The Winsure range starts at the simplest shape of this: wsCom1000-1GST-1G/DC-INT, one fiber port and one RJ45 port, in a DIN-rail aluminium case. It gives you exactly one Ethernet port at the far end of a 20 km single-fiber run, and it costs less than any switch that could do the same job.
What an Ethernet switch actually does
A switch takes one uplink and turns it into many ports, and then makes decisions about where to send each frame. That last part is the difference that matters: ports are cheap, but a switch also gives you the ability to keep traffic apart, and it is what you need the moment two devices share the same link.
If a site has four cameras at the far end, a single-port converter is the wrong answer. Either fit a switch with a fiber uplink, or fit one converter and put a small switch behind it.
Where the two overlap — and why that is useful
Two product shapes in the range deliberately blur the line, and both are worth knowing about:
· Converters with a built-in switch. Models such as wsCom1005-1GST-4G/DC-INT (1 fiber + 4 RJ45) and wsCom1005-2GST-4G/DC-INT (2 fiber + 4 RJ45) carry a fiber uplink and four copper ports in one box. They solve the “both problems” case in a single unit.
· Switches with an SFP slot. A switch with a pluggable slot can accept an optical module, which does part of what a converter does — but the module and the switch are two separate line items, and the switch still has to be configured as a switch.
So the practical question is not “converter or switch” but “how many copper ports do I need at the far end, and is the run longer than 100 m?”
The pairing you will actually build
In a typical building-to-building link the shape is: a switch in building A collecting the local devices, one fiber strand leaving it, and at the far end either a converter (one device) or a second switch (several devices). That is why the two products are sold together so often — and why buying only one of them usually means coming back for the other.
2. Three projects where a media converter is the right buy
These three come up constantly, and in all three the device count at the far end is one or two, so a converter is cheaper and simpler than a switch.
A 2 km link between factory buildings
Two production buildings on the same site, 2 km apart along a service road, with a fiber duct already laid between them. The link is well past the 100 m copper limit, and there is nothing at the far end except the other building’s equipment room. A pair of gigabit single-mode converters solves it: copper into the converter in building A, fiber along the duct, copper out of the converter in building B. Because the run is under a few kilometres, the 3 km variant of wsCom1000-1GST-1G/DC-INT is enough; for a longer estate, the 20 km variant covers the same job.
If the far end needs more than one device, that is the signal to use a switch there instead — see section 3.
An elevator camera
An elevator car needs a camera, the car moves, and the only cable that can follow it is the traveling cable in the shaft. The run from the machine room to the car regularly exceeds 100 m, and there is exactly one device at the end. A compact converter in the car, or a converter in the machine room feeding a single camera over the traveling cable, does the job with no configuration and nothing to manage inside the shaft — which matters, because nobody wants to service a switch inside a lift shaft.
For this kind of single-device, fixed-distance job, a converter in a small metal case is usually the lowest-risk choice.
A cell-site or base-station backhaul
A base station, an RRU cabinet or a small telecom hut has one fiber pair leaving it and one or two RJ45 devices inside. Again: one long run, a handful of ports, no switching needed. This is also the case where the temperature and power figures matter most, because the cabinet is not air-conditioned — which is why the range includes models rated from −20 °C to 65 °C with a wide DC input and 4 kV surge protection on the ports.
When a converter is the wrong answer
Three cases where you should stop and buy a switch instead:
· More than a couple of devices at the far end. A single-port converter gives you one port. Four cameras need four ports.
· Traffic that has to be separated. VLAN separation, QoS and port mirroring are switch features; a converter is transparent and cannot do any of them.
· A site that needs remote diagnostics. A converter has nothing to manage. If you need to see the far end over SNMP, that end needs a managed switch.
| Situation | Fit this | Why |
|---|---|---|
| 2 km between two buildings, one device at the far end | Converter pair | Distance is the only problem. Two converters cost less than two switches. |
| Elevator car camera, one device | Compact converter | Nothing to configure in a place nobody wants to service |
| Base-station backhaul, one or two devices | Industrial converter | Wide DC input, −20 ~ 65 °C, 4 kV on the ports — built for an unconditioned cabinet |
| Four cameras 300 m away | Switch with a fiber uplink | Four copper ports needed; a converter gives one |
| Two networks that must stay separate | Managed switch | VLAN and QoS are switch functions |
Figure 1 — One long link, two different jobs: a switch where the devices are, a converter where the distance is, and the three cases that decide which to buy.
3. Selection table: single-mode or multimode, speed, wavelength, module
Once you have decided a converter is the right device, five choices remain. Only two of them are usually hard.
Single-mode or multimode
Single-mode, in almost every case. The whole Winsure converter range is built around it — single-mode dual-fiber by default, with single-fiber BiDi at 1310 / 1550 nm available as an option — and single-mode covers everything from a few hundred metres out to 120 km without changing the unit. It is also the cheaper cable to buy new, and the connector options (ST, SC, FC) are the same either way.
The one reason to choose multimode is to reuse a multimode backbone that already exists in the building. If you are running new fiber, run single-mode.
| Single-mode | Multimode | |
|---|---|---|
| Best distance | Hundreds of metres to 120 km | A few hundred metres |
| Winsure default? | Yes — single-mode dual-fiber is the default across the range | Only relevant to reuse an existing multimode backbone |
| Single-fiber option | Yes: BiDi at 1310 / 1550 nm, halves the strand count | Not typically offered |
| Choose it when | New fiber, or any run over a few hundred metres | Multimode cable is already installed and you want to use it |
Speed: 100 Mbps, 1 G or 10 G
Match the speed on both sides of the link, and match it to what the link actually carries. 100 Mbps is plenty for a single camera or a Modbus-to-SCADA hop; 1000 Mbps is the normal choice for a building-to-building link; 10 Gbps only makes sense when the fiber is a backbone between switches rather than a link to one device.
| Speed | What it is for | In the range |
|---|---|---|
| 100 Mbps | One camera, metering, serial-to-Ethernet, any low-rate single-device link | wsCom100-1TXST-1TX/DC-INT, wsCom309-1TXST-4TX/DC-INT, WS105-2TXST-4TX/DC-INT |
| 1000 Mbps | The normal building-to-building or camera-trunk link | wsCom1000-1GST-1G/DC-INT, wsCom1005-1GST-4G/DC-INT, wsCom3010-2GST-8G/DC-INT |
| 10 Gbps | Backbone between switches, aggregation, high-density camera trunks | WS1005-2GESFP-4GE/DC-INT — 2 × 10G SFP+ with 4 × 2.5G/1G RJ45 |
Wavelength, and single-fiber BiDi
On dual-fiber units the wavelength is fixed by the module and can be quoted as a pair, so there is nothing to decide at the desk. The one place wavelength becomes a real decision is single-fiber BiDi, where transmission and reception share one strand at two different wavelengths: a 1310 nm unit at one end and a 1550 nm unit at the other. Get that pairing wrong at order time and the link will not come up, so it is worth writing both ends of the link explicitly into the RFQ rather than ordering “two converters”.
BiDi is worth choosing when strand count is the constraint — a site where one fiber pair has to be reused, or a long route where cabling is the dominant cost. Halving the strand count is a real saving at that scale.
Fixed 1×9 fiber port or SFP slot
This is the second decision that actually matters, and it comes down to whether the distance is known when you order.
| Fixed 1×9 fiber port | SFP slot | |
|---|---|---|
| Distance and wavelength | Fixed at order time | Set by the module you plug in |
| Cost | Lower — no separate module | Higher — the module is a separate line item |
| Changing your mind later | New unit | Swap the module |
| Connector options | ST / SC, and FC on the 100 Mbps models | Depends on the module |
| Choose it when | The route and the fiber type are settled | The route may change, or you want one spare module to cover several sites |
Distance and connector
Finally, put a number on the run and a name on the connector:
· Distance. Measure the actual route, not the straight line, and add margin. The range quotes 3 km and 20 km link lengths, and on the switch side of the portfolio fiber distances run from 0.55 km out to 120 km.
· Connector. ST, SC and FC all appear in the range, and the choice is usually decided by what is already terminated in the two cabinets. If both ends are yours, SC or FC is the more usual pick today; if you are patching into existing hardware, match what is there.
· Strand count. Count the strands you have, not the strands you would like. If it is one, you need BiDi.
4. Media converters and optical modules in the Winsure range
Winsure builds Ethernet switches, optical transceivers and media converters and fiber accessories in its own factory in Shenzhen, where it has run OEM and ODM production for overseas partners since 2016. Twenty switch models and fourteen transceiver models are held in stock, and CE, FCC and RoHS certificates ship with each batch. The company holds ISO 9001, ISO 14001 and ISO 45001.
The converter range splits into the industrial-grade fiber optic transceivers — DIN-rail aluminium, wide DC input, 4 kV surge protection — and the commercial carrier-grade transceivers for indoor cabinets.
| Model | Ports | Where it fits |
|---|---|---|
| wsCom1000-1GST-1G/DC-INT | 1 fiber + 1 × 1000M RJ45 | The single-device long link. Single-mode single-fiber at 1550 nm over 20 km, or the 3 km variant at 1310 nm. DIN-rail aluminium, DC 12–57 V, 4 kV surge, 104 × 78 × 32 mm |
| wsCom1000-1GST-2G/DC-INT | 1 fiber + 2 × 1000M RJ45 | Two devices at the far end, still no switching needed. ST / FC / LC options, 116 × 85 × 30 mm |
| wsCom1005-1GST-4G/DC-INT | 1 fiber + 4 × 1000M RJ45 | A converter with a built-in four-port switch — the “both problems” case in one box. Supports PoE power supply, so it can feed a camera or access point at the far end |
| wsCom1005-2GST-4G/DC-INT | 2 fiber + 4 × 1000M RJ45 | Two fiber ports, so it can sit in a ring as well as on a spur. SFP slot: the optical module is selected separately |
| wsCom3010-2GST-8G/DC-INT | 2 fiber + 8 × 1000M RJ45 | The extension-to-a-floor case: a fiber uplink plus eight copper ports, 145 × 110 × 45 mm |
| wsCom100-1TXST-1TX/DC-INT | 1 fiber + 1 × 100M RJ45 | The smallest and cheapest single-device link. Also available with industrial-grade modules for a −40 ~ 70 °C rating instead of −20 ~ 65 °C, and with AC/DC dual supply as an option |
| wsCom309-1TXST-4TX/DC-INT | 1 fiber + 4 × 100M RJ45 | Four low-rate devices at the far end — metering, sensors, a small camera group. DC 9–36 V, 116 × 80 × 30 mm |
| WS1005-2GSFP-4G/DC-INT | 2 × SFP + 4 × 1000M RJ45 | Commercial range, SFP slot, 3 km link, DC 5–12 V, 4 kV surge, 142 × 92 × 27 mm. Indoor cabinet |
| WS1005-2GESFP-4GE/DC-INT | 2 × 10G SFP+ + 4 × 2.5G/1G RJ45 | When the link is a backbone rather than a spur. −20 ~ 65 °C, metal housing, 143 × 79 × 27 mm |
Pair any of these with fiber optic patch cords and a termination box or ODF from the same order, and the whole link arrives on one delivery.
5. What to send us for a quote
1.The two endpoints, and the cable route length — not the straight-line distance.
2.Whether fiber is already installed, and if so, single-mode or multimode, and how many strands.
3.The connector already terminated at each end: ST, SC, FC, or an SFP slot.
4.Speed required: 100 Mbps, 1000 Mbps or 10 Gbps.
5.How many copper ports are needed at the far end.
6.Whether the far end needs PoE to power a camera or access point.
7.Where each unit will be mounted: air-conditioned cabinet, or an unconditioned outdoor or factory enclosure.
8.Input power available at each end, and whether you want dual supply.
9.Certifications required, quantity, target delivery date, and whether you need OEM or ODM branding.
Send it to info@cnwinsure.com or WhatsApp +86 134 2874 4818. An engineer replies with a written quote within 24 hours, and OEM or ODM production is available with your logo, your label and your carton.
Frequently asked questions
1.What is the difference between a media converter and an Ethernet switch?
A media converter carries one copper Ethernet segment onto fiber and back, so a run longer than 100 m arrives as if it were local; a typical unit gives you one fiber port and one, two or four RJ45 ports. An Ethernet switch gives you a group of ports and moves traffic between them, which is what you need when several devices share a link. A converter solves distance, a switch solves device count — and most networks need both, at opposite ends of the same fiber.
2.When should I use a fiber media converter?
When the only real problem is distance and there is nothing to switch between: a link between two buildings 2 km apart, a single camera in an elevator, or a base-station backhaul where one fiber pair leaves the cabinet. If you also need to connect several devices at the far end, fit a switch with an SFP or fixed fiber port instead, or pair a converter with a small switch.
3.Do I need single-mode or multimode for a media converter?
Single-mode, in almost every case, and that is what the whole Winsure converter range is built around: single-mode dual-fiber by default, with single-fiber BiDi at 1310 / 1550 nm as an option. Single-mode handles distances from under a kilometre out to 120 km and its patch cords are no more expensive. Choose multimode only if the building already has a multimode fiber backbone you intend to reuse.
4.Can a media converter power a PoE camera?
Only on the models that list PoE support. In the industrial range wsCom1005-1GST-4G/DC-INT supports PoE power supply, so a camera or access point at the far end can be fed from it; the commercial carrier-grade converters also list PoE+ (IEEE 802.3at) support. A converter without PoE still carries the data, and the camera still needs its own power supply.
5.Can I use two media converters back to back?
Yes, and it is a common pattern when there is no switch to uplink into: converter A turns copper into fiber at one end, converter B turns it back at the other, and the far end comes out as ordinary copper Ethernet. Match the speed at both ends, match the wavelength if you are using single-fiber BiDi, and make sure both units are the same duplex type — BiDi needs a 1310 nm unit at one end and a 1550 nm unit at the other.
6.How do I extend Ethernet over fiber beyond 100 m?
Copper Ethernet stops at 100 m, so beyond that the link has to become fiber. If fiber is already installed, terminate it and put a media converter at each end of the copper you want to extend. If it is not, choose the fiber type and connector first, then pick the converter with the matching fiber port — ST, SC or FC on the 1×9 models, or an SFP slot on the models where the module is chosen separately. Optical modules are sold separately on the industrial range, so put them in the RFQ.
Tell us the two endpoints and the distance, and we will tell you what to fit. Send the route length, the fiber type and connector already on site, the speed and the number of devices at the far end, and we will come back with a written quote within 24 hours — including the correct optical modules and power supply, so nothing arrives missing.
Browse the media converter and optical module range or learn more about Winsure.