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FAQ

21 questions, answered from the catalogue

Every answer below is built from the specification tables on this site — 186 models, 7 families — and from nothing else. Where the catalogue prints no figure, the answer says so and points at the quotation instead of inventing a range.

01

Choosing the right unit

4 questions

Should I use a media converter or a switch?
Count the devices at the far end. A media converter takes one copper port and one fibre port — LNK-IMC3012 is printed as 1xRJ45 + 1xSC/ST/FC 1000Base-FX. A switch puts several copper ports behind one or two fibre uplinks — LNK-IMC104G-SFP is 4xRJ45 + 1xSFP. One camera or one PLC: converter. Four cameras, a teller row or a machine cell: switch.
When do I need the managed (L2+) models instead of the unmanaged ones?
The catalogue separates the two in each switch range, and the managed entries carry "L2+ managed" in their ordering information — ETH-IMC208M, ETH-IMC408M, ETH-DIMC2416M, LNK-GYM7816G-SFP and the ETH-DIMC24xxMP PoE range, for example. Choose managed when the topology is a ring, when two segments must stay apart, or when the device needs an address. The detailed feature list for a specific model is confirmed with the quotation — the catalogue prints the port layout and the power, not a software data sheet.
Can one box give me serial and Ethernet on the same link?
No. The serial fibre modem line — LNK-IRS93-SC and LNK-IRS93-SFP — is printed as one optical port plus one RS-232/485/422 port, and it carries serial only. A site that needs both serial telemetry and an Ethernet LAN needs a modem plus an Ethernet unit on the same fibre route.
How is the catalogue organised, and how many models are there?
186 models in seven families: media converters (54), industrial Ethernet switches (34), industrial PoE switches (33), PoE power, splitters and extenders with their DIN-rail supplies (37), carrier and optical switches (13), fibre network cards (10), and fiber enclosures and racks (5). On top of that the site lists 136 optical modules from 155 Mb/s to 400G.

02

Fibre, distance and optics

5 questions

Single-mode or multi-mode?
Both appear in the same model number, as a variant. The 100M fixed-optics converters print "2KM or 20KM" and the gigabit ones print "550M or 20KM" — the first figure is the multi-mode build, the second the single-mode build. In-building runs under 550 m (gigabit) or 2 km (100M) are normally multi-mode; campus and metro runs to 20 km are single-mode. On the SFP models the question moves to the module.
What is the maximum distance?
The optic sets it, not the converter. Fixed-optics models print 550 m, 2 km or 20 km depending on the data rate. The serial modem prints 2KM or 20/40/80KM. Every SFP model prints "depends on the SFP module", and the 136 modules listed on this site run from 155 Mb/s to 400G, so reach is chosen when the module is chosen.
Do I have to order the SFP modules separately?
Yes on the SFP-slot models. Each product table names the module series that fits it — LNK-SFP-155M and LNK-SFP-1.25G on the 100/1000X ports, LNK-SFP-10G on the SFP+ models. Where a copper hand-off is wanted instead of fibre, LNK-SFP-100-T is a 100BASE-T RJ45 module printed at 100 m.
Single fibre (BiDi) or duplex?
They are different parts, not different settings. A duplex pair uses two strands; a BiDi part uses one strand and a different wavelength in each direction, so the two ends have to be an ordered pair. The module list includes both kinds up to 400G. Fitting a BiDi module at one end and a duplex module at the other will not link, and the port LEDs give no hint which side is wrong.
Can I put a 155M module in a gigabit port?
Only where the port is the auto-detect 100/1000X type, which the catalogue states for models such as LNK-IMC3012P60-SFP (printed "1000Base-X or 100Base-FX, auto-detect"). Ports printed as 1000Base-X only need the gigabit module. Compatibility for a module from another vendor is confirmed with the quotation.

03

Power, PoE and environment

5 questions

Can the fibre carry power to the camera?
No. Fibre carries light, so the PoE has to be generated at the far end: either by a PoE switch in the cabinet, by a PoE converter such as LNK-IMC3012P60-SFP, or by an injector on its own supply (LNK-INJ301 series, 12~48 VDC in, 100 m of copper out). An injector at a pole needs a local feed — there is no way around that.
How do I size the PoE power supply?
Add the peak draw of every powered port, add headroom, then buy a 48 V supply that covers it. The catalogue already pairs each switch with one: LNK-IMC104GP with NDR-120-48 (120 W / 48 V 2.5 A), LNK-IMC208GP and LNK-IMC205GHP-SFP with NDR-480-48 (480 W / 48 V 10 A), the 8-port managed PoE models with NDR-240-48. Note the input: PoE units take 48~57 VDC, so a 24 V rail in the cabinet will not feed them directly.
Which PoE standard do the models support?
Where the catalogue prints it: LNK-IMC104GP, LNK-IMC208GP and LNK-IMC208SGP-SFP are 802.3at, LNK-IMC205GHP-SFP is printed as 802.3bt 90 W, LNK-IPOE-30W and LNK-IPOE-95W are 30 W and 95 W IP67 injectors, and LNK-PSE9501G is printed af/at/bt. A camera that only behaves on 802.3bt needs a bt source — an at port will negotiate and then under-power it.
What input voltage do the units expect?
Industrial converters and switches: 12~48 VDC on a Phoenix terminal. PoE switches and PoE converters: 48~57 VDC. Rack-format managed switches (LNK-216M-R, LNK-424M-R, LNK-448M-R): AC 100~240 V. IP67 outdoor injectors (LNK-IPOE-30W/95W): 90~264 VAC. LNK-INJ832 is printed 80~320 VDC for high-voltage DC feeds. The DIN-rail supplies output 24 V or 48 V — MDR-20-24 at 24 W, EDR-75-48 at 75 W, NDR-120-48 / 240-48 / 480-48 at 120 W / 240 W / 480 W.
What is the operating temperature range?
Where the catalogue prints one, it reads 0~70 °C on the industrial converter and switch families, and 0 to 55 °C on the 2.5G series and the all-optical switch models. A large number of entries print no temperature line at all, and the catalogue prints no −40 °C rating anywhere. For a roadside or outdoor cabinet, ask for the range of the exact model — it is confirmed with the quotation rather than assumed here.

04

Certificates, OEM and terms

7 questions

Where is your factory, and can we visit it?
The office on this site is the Guangzhou commercial office — quotations, samples, export paperwork and pre-shipment inspection run from there. The manufacturing site is disclosed to qualified buyers and confirmed during a supplier audit, and a visit is arranged as part of that process. Address and factory are deliberately kept as two separate items so nothing on this site implies the office is a plant.
Are the products certified?
The About page reproduces the 16 certificate images printed in the catalogue, among them an ISO 9001 certificate and CE, FCC and RoHS certificates for the Ethernet switch models. Certificate numbers are deliberately not transcribed on this website — the certificate pack for the part numbers you order is supplied with the quotation. Certification of a specific model against a specific standard should be agreed in writing before the order.
Do you do OEM and ODM?
Yes — the OEM / ODM page sets out the five steps from specification to shipment. Branding, labelling and packaging under your part numbers are the normal shape of the work; whether an existing model is re-badged or modified is decided per project. Scope, tooling and quantities are confirmed with the quotation.
What is the minimum order quantity?
It is not published, because it depends on the model and on the build: a standard converter and a custom-labelled switch do not carry the same minimum. Minimum order quantity is confirmed with the quotation.
What is the lead time?
Lead time is stated against the production schedule for that exact model, so it is confirmed with the quotation rather than published as a single number. If a project has a fixed installation date, give the date in the enquiry and it is checked against the schedule before the offer is written.
Can I get samples before ordering?
Sample availability — and the cost of a sample unit — is confirmed with the quotation. Samples are normally used for qualification of the link, so state the far-end device and the fibre type in the request; a sample tested against the wrong optic proves nothing.
What is the warranty?
The catalogue does not print a warranty term, so none is published here. The warranty that applies to your order is confirmed with the quotation and stated on the order confirmation. Field-failure handling — return, replacement or credit — is agreed at the same point, not left to interpretation later.

Not answered above?

Two places to go next: the five application pages work through a link end to end, and the product pages carry the full catalogue table with the page it came from. If the question is about a specific installation, send the drawing — the answer comes back with model numbers on it.