--- title: Repair and verification of network test equipment – TEST4NET description: Repair of traffic generators, test chassis and load modules, and verification of used units before purchase or after a repair. A run on real traffic before the unit goes back. 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A test port that stopped linking, a chassis that no longer boots, a used generator you are about to buy. We find the fault and write it up, fix it once you approve, and run the unit on real traffic before it goes back. [Send the model and the symptoms](https://test4net.com/services/equipment-repair#lead-form) [What we take](https://test4net.com/services/equipment-repair#scope) 1. 01**Request**On request 2. 02**Diagnostics**Agreed per case 3. 03**Repair**On your approval 4. 04**Verification run**Before return Why a test lab ## Three things a repair shop without traffic generators cannot give you A power-on self-test says the board is alive. It says nothing about a port that links up and drops frames at 70% of line rate, or a fan tray that holds for 10 minutes and then trips. Test hardware is fixed when it passes traffic long enough to get hot. The lab has the generators to prove that. 1. ### The repaired unit runs on real traffic After the repair the unit goes on the bench with the traffic generators and runs under load. A chassis gets its modules loaded, a load module gets every port at line rate, an analyzer port gets its counters and timestamps checked against a reference port. Holding the load is the finish line. 2. ### Diagnostics report before any repair You get a written report first: what failed, why, what the fix involves and whether it makes sense for this unit. The decision to go ahead, or to stop at the diagnostics, is yours. 3. ### Verification run after the repair The report closes with the run after the fix: the same test on the same ports as before, so you can compare the two. Photos and logs travel with the unit. From intake to return, two gates on the way Intake model, symptoms Diagnostics report repair / do not repair Repair on your approval Verification run real traffic, the bench Return report, photos, logs YOUR DECISION PROOF Chassis, load modules, power and fans ## What we take and what comes back with it Traffic generators, analyzers and their chassis, repaired or checked before you rely on them. For each line: what we check, what the fix usually involves and what you receive. | Equipment | What we check | What we fix | What you get back | | --- | --- | --- | --- | | 01Test chassis | Power rails, backplane, controller and management boards, fan trays, firmware and licence state | Power supplies, fans, controller boards, firmware recovery | Report, a run with modules loaded in the chassis, photos | | 02Load modules | Every port at line rate, optics cages, memory, temperature under load | Port circuitry, optics cages, memory, board-level faults where rework holds | Port-by-port run, loss and latency before and after, photos | | 03Power supplies and fans | Output under load, ripple, fan speed, alarms | Capacitors, fans, connectors, or a matching replacement unit where repair makes no sense | Load test log, thermal soak result | | 04Used or repaired systems, verification only | Inventory against the listing, boot, firmware and licence state, every port at line rate, counters and timestamps against a reference port | Nothing by default: faults go into the report with a repair estimate, the fix on your approval | Verification report port by port, licence and firmware state, a view on whether the unit is fit for use | Test hardware not on the list: send the model anyway, the intake reply says whether we take it. We do not take RF and radio test equipment. How it goes ## Four steps, nothing touched before you approve the report 1. 1 ### Request On request Model, serial number, firmware, what the unit did before and what it does now. Alarms, logs and photos if you have them. Intake reply: yes or no, and what the diagnostics covers 2. 2 ### Diagnostics Agreed per case The unit goes on the bench: power rails, ports, fans, memory, firmware and licence state. We find the fault and write what it would take to fix it. Diagnostics report with a repair or do-not-repair verdict 3. 3 ### Repair On your approval Nothing is touched before you approve the report. Then the failed part is replaced or reworked and the firmware restored where needed. Repaired unit and a work log 4. 4 ### Verification run Before return The unit runs on real traffic in the lab: every port at line rate, a thermal soak, the same test before and after. Results go into the report. Run results, photos, logs, the unit back to you Illustrative Typical scenario ## A load module with one dead port and no vendor contract An operator lab has a load module whose port 3 stopped linking after a power event. The vendor dropped the card two firmware generations ago and a new one is a budget line the lab does not have this year. The module comes to the bench. The diagnostics finds the port circuit damaged, the other ports healthy, the firmware intact. The report says the fix makes sense. After the rework the module runs every port at line rate for a multi-hour soak, port 3 with the same loss and latency as its neighbours. It goes back with the run results and the photos. Illustrative scenario, no figures from a real repair. Every unit gets its own report. Found Port 3 circuit damaged by a power event, remaining ports healthy, firmware intact Decided Repair: one circuit, the board otherwise sound. Approved on the report before any work. Verified Every port at line rate through a multi-hour soak, port 3 in line with the others on loss and latency Questions before the request ## What owners ask first ### What if the unit cannot be repaired? You get the diagnostics report with the reason: a part that no longer exists, a board damaged beyond rework, a fix that costs more than the unit is worth. The report is yours either way, and the unit goes back to you. ### How long does it take? Agreed per case, after the unit is on the bench. Diagnostics has one date, the repair another, and the part supply decides the second. The report names both. ### Where do spare parts come from? From the same class of hardware where possible: a donor board, a matching power supply, a fan tray of the same type. The report says which part is needed and whether it is on hand or has to be sourced. Sourcing time is part of the agreed timeline. ### Is there a warranty on the repair? The terms are agreed per repair and written into the offer before the work starts. One thing is always included: the verification run results, so you can see what the unit did on the bench before it left. ### What do you need from us to start? The model and serial number, the firmware version, what the unit was doing when it failed, and any alarms or logs. Photos of the front panel and the fault indicator help. The intake reply confirms the address and how to pack the unit. ### Is the verification report a calibration certificate? No. It records what the unit did on the bench, port by port, against a reference, with the method and the date. If your organisation needs an accredited calibration certificate, say so at intake: the reply tells you whether the report covers your case. ## Send the model and the symptoms. The intake reply says whether we take it and what the diagnostics covers. The report comes first. The repair starts only after you approve it. 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The report is yours either way, and the unit goes back to you." }, "name" : "What if the unit cannot be repaired?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Agreed per case, after the unit is on the bench. Diagnostics has one date, the repair another, and the part supply decides the second. The report names both." }, "name" : "How long does it take?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "From the same class of hardware where possible: a donor board, a matching power supply, a fan tray of the same type. The report says which part is needed and whether it is on hand or has to be sourced. Sourcing time is part of the agreed timeline." }, "name" : "Where do spare parts come from?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "The terms are agreed per repair and written into the offer before the work starts. 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