I'm a quality compliance manager at a telecom test equipment company. I review every test report that goes out to customers—roughly 200 unique results a year (yes, I keep an audit log). In Q1 2024, I rejected 12% of first deliveries. Not because the gear was bad, but because the wrong tool was used for the job, or the test was set up wrong.
So if you came here expecting a single answer to “Which EXFO product do I buy?”, I am going to disappoint you. The right choice depends on the work you do. This article is set up like a decision tree: find your scenario, then read the recommended tool.
Three test scenarios
Most teams I work with fall into one of these:
- Scenario A – Field activation and troubleshooting. You are on a truck, testing FTTx/PON or business links, and you need a fast pass/fail answer with a report you can defend.
- Scenario B – Network or lab validation. You are testing DWDM/ROADM infrastructure, 5G backhaul, long spans, or anything where a simple loss number is not enough.
- Scenario C – Short links and patch cords. You are certifying jumpers, patch panels, or pre-terminated cables and probably do not need an OTDR at all.
If you are not sure which one you fit into, answer the three questions at the end of this article.
Scenario A: Choose the EXFO Max Tester if you need speed in the field
The EXFO Max Tester line is built for the field tech who does a dozen jobs a day and still has to produce a clean report. In our 2024 field audit, we timed techs on a standard FTTx link. The Max Tester's auto OTDR mode gave a clear pass/fail with one connection, saved the trace, and got the tech to the next job in under 60 seconds. On an $18,000 project, that consistency matters.
I have mixed feelings about this, honestly. On one hand, a one-button tester makes it easier to train new techs. On the other hand, easy results can make people skip the basics: Is the reference set correctly? Are the connectors clean? Did you test in both directions? The EXFO Max Tester is excellent, but it is not a substitute for understanding loss budgets.
Many Max Tester models can send results through EXFO Connect, and a lot of techs simply share the PDF from their phone. That solves the old problem I used to see all the time: a trace saved as a screenshot and never uploaded to the customer portal.
Scenario B: Choose the EXFO 945 when one number is not enough
The EXFO 945 is a different class of instrument. You reach for it when you need to see inside the link. In late 2024, a carrier was validating a route that would carry the n93 band for phone traffic. The RF team had tuned the radio side perfectly, but the optical transport path had a reflective event at 12.4 km. A power meter would have said light is reaching the far end. The EXFO 945 trace showed the reflection and its exact location.
That is the practical difference. The 945-class module gives you a full OTDR event table, accurate distance information, and trace data you can use in an engineering review. It is also the tool I grab for workmanship audits on new splices and for troubleshooting intermittent links that passed a basic loss test but keep causing errors in service.
If you are accepting work from subcontractors, especially on outside plant, I would rather see one clear 945 trace than ten Max Tester screenshots with no event table. The 945 report gives you repeatable evidence.
Scenario C: Do you even need an OTDR? (Multimeter detour)
This is the part that trips up a lot of teams. Somebody asks, “how to use multimeter” because they think an optical tester works the same way as an electrical tester. It does not. A multimeter measures voltage, continuity, and resistance. It tells you whether copper has a connection, but it cannot measure optical loss, reflectance, splice quality, or the location of a fiber fault.
For short links, the fiber-optic equivalent is an optical light source and power meter, or the OLTS function in the EXFO Max Tester. The process is simple:
- Clean and inspect both connector end-faces.
- Set the reference with a launch cable.
- Measure loss at the wavelengths you are certifying (usually 1310 nm and 1550 nm for single-mode).
- Test in both directions and compare to the loss budget.
According to ANSI/TIA-568.3-D (tiaonline.org), a mated single-mode LC connector has a maximum insertion loss of 0.75 dB. Verify the current version before you quote it, but that number still catches people who think any “low” dB reading means the link is good.
I only believed in routine connector inspection after ignoring it once and paying for an $800 re-visit. The link failed intermittently. The EXFO Max Tester flagged high loss, but the fiber microscope showed a tiny scratch on the ferrule. After that, every kit we built included an inspection scope. If that sounds like overkill, you have not yet met the connector that costs you a second truck roll.
If you do need an OTDR, use the EXFO 945 for the first time on a link you know is good. Compare the trace to one from a link you know has a problem. That exercise teaches more than any spec sheet. In our lab, we do this with every new engineer, and it cuts down on misinterpretation.
How to decide: three questions
Here is how I walk through the decision with our own project managers.
1. Do you need to find faults or just prove the link is good?
If you need to find faults, plan on the EXFO 945 class of OTDR. If you only need to prove the link is good, the EXFO Max Tester with an OLTS/OTDR combo is often enough. The Max Tester can locate faults, but it does not have the same depth of analysis as the 945.
2. Who is running the test?
A senior tech can handle either. A newer tech will produce more reliable reports with the Max Tester because the interface guides them through the process. I have seen a ton of trace files from the high-end unit that were saved with the wrong fiber name or no distance scale. The tool is not the problem; training and supervision are. But a simpler workflow removes a lot of user error.
3. What does your customer actually need?
If the deliverable is a certification table, the simpler tester is fine. If the deliverable is an engineering acceptance report with splice maps, event tables, and before/after traces, use the EXFO 945 or equivalent. Choose the tool that matches the level of evidence you are expected to defend.
If you are still stuck after those three questions, start with the EXFO Max Tester. It covers more day-to-day jobs, and you can always rent or borrow a 945-class OTDR when a specific project needs deeper analysis. That is not a decision that comes from a marketing page; it is what a quality team would do if they were weighing the same trade-offs.
And when someone tells you to “just use a multimeter on it,” send them back to this article.
