Multimode Pricing by Cable Type
What are OM3 and OM4 multimode fibre cables
Multimode fibre means many light paths inside the core. The core is typically 50 µm for both OM3 and OM4 (with 125 µm cladding) in modern installations.
They are laser-optimised multimode fibres (LOMMF) using VCSELs (Vertical-Cavity Surface-Emitting Lasers) at 850 nm wavelength.
OM3 and OM4 are governed by standards (IEC or TIA) that define modal bandwidth, attenuation, transmission distance, etc.
In simple terms: OM4 is the improved version of OM3. It costs a bit more. And it gives you better performance (longer distances at high data rates, better margin). But OM3 still is fine for many installations. read another one of our blogs https://fibresales.com.au/om3-vs-om4-fibre-whats-the-difference
Key performance differences: bandwidth, distance, attenuation
Here are the core specs and differences.
Bandwidth (Modal Bandwidth)
Think of a fibre optic cable like a multi-lane highway for light. Each “lane” is called a mode, and light can travel down many lanes at the same time.
Now, the problem: not all lanes are equal. Some lanes are longer or twistier, so light in different lanes can arrive at the end at slightly different times. This causes a kind of “traffic jam” for the light signals, making them blur together if the cable is too long or the data speed is too high.
Modal bandwidth is basically a measure of how much data a multimode fibre can carry over a certain distance without the light signals overlapping too much.
Higher modal bandwidth → the fibre can carry more data over a given distance.
Lower modal bandwidth → the fibre can carry less data, or only over shorter distances.
Example:
OM3: minimum effective modal bandwidth is about 2,000 MHz·km (at 850 nm) in many spec sheets. If your cable is 1 km, it can handle 2,000 MHz of data.
OM4: minimum modal bandwidth is about 4,700 MHz·km (at 850 nm) in typical spec sheets. If your cable is 1 km, it can handle 4,700 MHz of data.
Higher modal bandwidth means you can transmit higher data-rates, or the same data-rate further, or with more margin.
What it means in practice:
Higher modal bandwidth → better performance.
With OM4, you can either:
Send more data over the same distance.
Send the same data further.
Have extra margin to account for signal loss or future upgrades.
Distance / Data-Rates (for 10G, 40G, 100G)
Because OM4 has higher modal bandwidth and lower dispersion, it allows longer distances at high data rates than OM3. Some typical figures:
For 10 Gigabit Ethernet (10G): OM3 might reliably support ~300 m. OM4 might go perhaps ~400–550 m. fibresales.com.au+1
For 40 G or 100 G: OM3 might be limited to ~100 m or so. OM4 might support ~150 m (or more) at that data-rate.
If you are installing a short run (say rack to rack, same floor) then OM3 is often fine. If you are doing longer runs, or you anticipate higher data-rates (40G, 100G, even future 400G), then OM4 gives you extra head-room.
Attenuation / Loss
Loss in fibre is how much signal is diminished per unit length. For OM3 vs OM4:
OM3: attenuation at 850 nm typical ~3.5 dB/km in some spec references.
OM4: attenuation maybe ~3.0 dB/km or better at 850 nm.
Lower loss means you either can go further, or you have more margin for connectors/splices etc. It also means better signal quality (less dispersion, more clarity).
Backwards compatibility
OM4 is backwards-compatible with OM3. That means you can use OM4 fibre in an installation that has OM3, but performance will be limited by the lowest grade in the chain. fibresales.com.au+1
But mixing them may reduce overall performance margin, so good practise is to run consistent fibre type across the link.
Construction types: Tight-buffer vs Loose Tube
Beyond the fibre “type” (OM3/OM4) you also need to think about how the cable is constructed. Two common constructions are tight buffered and loose tube.
Tight-Buffered Construction
In a tight-buffered cable, each fibre (or small bundle) has a robust buffer (protective coating) tightly around the fibre core/cladding.
Often used indoors, in building backbone, intra-building runs, communications rooms, equipment rooms.
Easier to handle in patch panels, easier to terminate.
Good for where mechanical protection is moderate, environment is controlled (indoors).
Because of the construction, perhaps slightly bulkier for a given core-count than some loose tube alternatives.
Works well for the kinds of installations where OM3 or OM4 multimode fibre is common (data centre, campus building).
Loose-Tube Construction
In a loose-tube cable, the fibres are loosely placed inside a protective tube (often gel-filled for outdoor, or dry for indoor/outdoor) that allows movement, expansion/contraction, stress relief.
Often used for outdoor, campus backbone runs, between buildings, aerial or direct-burial.
Better for harsh environments, temperature extremes, pulling long distances, where moisture or thermal variations matter.
If you deploy a loose tube cable but run multimode fibre for shorter campus runs you probably pay for features you don’t need. So cost differences matter.
For both tight-buffer and loose-tube you can have indoor/outdoor rated jackets, LSZH (Low Smoke Zero Halogen) etc, that affect cost.
Why construction choice matters
The choice affects cost (materials, jacket, protection), installation complexity (pulling, storage loops, tray fill), and performance (ease of termination, connector loss, splicing). When you’re looking at “fibre cable pricing” you cannot ignore construction – two cables both OM4 might cost quite differently depending on buffer/tube type, jacket rating, armour etc.
Multimode Pricing by Cable Type Core-Counts and Density
When selecting fibre cables you also need to think about how many cores (i.e., how many individual fibres) are in the cable. Some relevant points:
Multimode fibre cables (OM3/OM4) might come in simplex/duplex (1 or 2 fibres) for patch cords, or come in multi-core trunk cables (12, 24, 48 fibres, even higher counts).
Higher core-count cables allow multiple parallel links, or future growth, and may reduce overall cost per fibre/port (economies of scale), but the upfront cable cost is higher. Also density matters: in data centres you often want high fibre-density cables, compact diameter, easier tray fill, because you may upgrade in future. Choose OM4 + high core count if growth is expected.
If your network is small (two racks, one floor) you may only need duplex/trunk of modest size, and saving cost by choosing fewer fibres might make sense.
Multimode Pricing by Cable Type – Typical cost in Australia
Cost is always dependent on many variables (jacket rating, indoor/outdoor, armour, core count, termination, length, installation labour). But to give you ball-park numbers, and help you make an estimate, here are typical Australian cost ranges (as of recent data).
For OM3 multimode fibre cable in Australia: typical raw cable cost (per metre) might be about AUD $0.60 to $1.20 per metre for indoor rated, moderate core count.
For OM4 multimode fibre cable in Australia: typical cost around AUD $0.70 to $1.50 per metre for the cable alone (indoor rated, similar core count) according to some sources.
Pre-terminated assemblies (where the fibres already have connectors/factories terminations) cost significantly more (because factory labour, testing, certification). For example one source gave ~$4-$10 AUD per metre for pre-terminated fibre in Australia.
Note: these are raw cable material costs only. Installation labour, terminations, testing, route management, pulls, patch panels add quite a bit. Always budget accordingly.
Also note: if you go to outdoor rated, armoured, high-core-count, long runs, price will be higher—perhaps significantly more than these “basic indoor” ranges.
What this means in practise
If you are doing a modest intra-building data centre run (say 200 m) with indoor rated multimode fibre, you might estimate ~200 m * $0.80 = ~$160 for OM3 cable material. For OM4 maybe ~$200-300 depending on spec. That is only material. Labour/testing might multiply that many times. If you scale up (say 1 km of trunk, high core count), maths change.
Because OM4 is only modestly more expensive per metre (in many cases only maybe 10-20 % more per metre than OM3) but gives you significantly more performance margin, many Australian installers argue the incremental cost is worth it.
When you’d choose OM3 vs when OM4
Here’s a decision-matrix style guide:-
Choose OM3 when:
Your runs are short (say intra-floor, same building, <300 m) and you are comfortable with 10 Gbps now and likely near-term, but not huge future growth.
Your budget is constrained and you want “good enough” performance without over-specifying.
You anticipate moderate growth and you’re comfortable the fibre may be upgraded in future when cost or need is justified.
Installation is fairly straightforward (indoor, easy pathway, minimal risk), so you don’t need the “extra performance margin” that OM4 offers.
Example: small business data centre, campus building patch links, rack-to-rack links.
In short: “If you don’t need epic distances or 100G now, use OM3 and save some upfront cost.”
Choose OM4 when:
You have longer runs (200-500 m or more), or you expect to use higher data-rates (40G, 100G, or beyond) either now or soon.
You want future-proofing. You expect that in 3-5 years you might upgrade from 10G to 40/100G and you don’t want to re-cable.
You have high-density environment (data centre, HPC, cloud, campus backbone) where fibre cost per port, tray space, and future upgrade cost matter.
You have harsher or more complex installation (lots of connectors/splices, long link, multiple racks, high tray fill) and you want extra performance margin.
Example: large enterprise campus with buildings, multiple floors, expecting next-gen upgrades; or a data centre where rack-to-rack links and inter-rack links will demand 40/100G.
In short: “If you might bump up speeds, run longer, or want to avoid recabling later — pay a bit more and choose OM4.”
Some extra “fun-facts”:
Even though OM3 might suffice now, if you choose OM4 you get “insurance” for the future.
The cost difference per metre is often modest (10-20% more) but the cost (labour, disruption) of recabling later might be large.
If you mix OM3 and OM4 in the same link, you’ll be limited by the lowest grade fibre in that link. So if you have an OM4 run but connect into OM3 segments, you don’t get full OM4 benefit. So consistency is important.
Colour-coding: OM3 and OM4 often share aqua jacket colour; but sometimes OM4 is “Erika violet” or violet jacket (or violet core marking) to help distinguish.
Multimode Pricing by Cable Type – Applications: Where OM3 and OM4 are used
Let’s map typical application scenarios for each.
OM3 common applications
Intra-building backbone in offices: e.g., linking comms room to server room, same floor, same building.
Rack-to-rack patch links in smaller data centres or server rooms, where 10G is sufficient and future growth is moderate.
Legacy multimode fibre upgrades where cost is important and the network demand is moderate.
Short links (<< 300 m) where you don’t expect huge jump in data-rate soon.
OM4 common applications
Data centre backbone, inter-rack links, high-density switch-to-switch links, where 10G, 40G, 100G or beyond may be required.
Campus backbone between buildings/floors where distances are higher (200-500 m) and you may upgrade later.
Future-proofing installations: e.g., large hospitals, universities, multi-building campuses, cloud environments.
Environments where tray space, fibre density, and upgrade cost matter.
Any time you want “install once, worry less later”.
Multimode Pricing by Cable Type – Budgeting and cost-justification
How do you justify spending a bit more for OM4? Here are considerations.
Up-front cost vs lifecycle cost
Up-front: OM4 costs a little more per metre than OM3. As noted earlier, maybe 10-20% more in many cases in Australia.
Lifecycle cost: If you choose OM3 now and in 3-5 years you need to upgrade to 40/100G and you discover your fibre is limiting, you might have to rip out and re-cable. That’s big cost (labour, disruption, downtime).
Thus the incremental cost of OM4 can be seen as insurance against future recabling/disruption.
Cost per connection & density
If you have lots of fibres/trunks, cost per fibre matters. OM4 lets you use the same infrastructure for longer, supporting higher data-rates, so cost per port might go down over time.
Using higher core-count trunks, future expansion becomes easier. If you choose OM4 now, you might avoid needing to upgrade the trunk later.
Installation risk and margin
If your link is borderline (distance, connector count, fibre runs through trays, splices etc) then using OM4 gives you more margin. More margin means fewer problems (bit-errors, signal loss, performance hits).
If you choose OM3 and run into margin issues you may have to budget extra for repeaters, better transceivers, or even new cable runs. That can erode the cost saving.
Break-even thought
If the cost difference between OM3 and OM4 is modest (say $0.10-$0.30 per metre) and you expect your link to live for 5-10 years and maybe upgrade data‐rate in that time, it often makes sense to “pay a little more now” for OM4. If your budget is extremely tight and you can guarantee the link will never need more than 10G and never >300 m, then OM3 is fine.
Multimode Pricing by Cable Type Summary
So, summing up:
OM3 and OM4 are both 50 µm core multimode fibres, used for high-speed short/medium distance links.
OM4 offers significantly higher modal bandwidth (~4700 MHz·km vs ~2000 MHz·km), lower attenuation, and longer distances at higher data rates.
Construction (tight-buffer vs loose tube), jacket rating, core count, indoor/outdoor rating all influence cost materially.
In Australia, typical indoor OM3 cable cost might be ~$0.60-$1.20 AUD/m, OM4 ~$0.70-$1.50 AUD/m (material only) in many cases.
Choose OM3 when runs are short, data rates modest, budget tight, and future upgrade unlikely.
Choose OM4 when you want longer distances, higher data-rates now or soon, more future-proofing, more margin, less risk of upgrade cost later.
Multimode Pricing by Cable Type Conclusion
If you are doing a new install today and you have any possibility of needing 40G/100G or linking across floors/buildings (200-500 m) or you want minimal recabling risk, go for OM4. The extra cost is modest compared to the disruption cost later. If you’re doing a small install (single building floor, 100-200 m runs, comfortable with 10G now and little chance of upgrade) then OM3 is still a valid, cost-efficient choice.
