v4 Support
The GigaFOIL v4 has been out of production since 2023. Troubleshooting help is available below. When your v4 reaches the end of its useful life, the ACTIV 10G is the direct replacement.
Out of Production
The GigaFOIL v4 product line was discontinued in 2022. DJM no longer manufactures the v4 and cannot repair existing units. The components, the housings, and the test fixtures are all retired. If your v4 has failed, it cannot be sent back for service.
That said, we still answer questions. If your v4 is behaving strangely, the troubleshooting steps below resolve most issues. If you've worked through them and the filter still isn't right, the ACTIV 10G is the direct replacement and ships from current inventory. The ACTIV 10G uses the Universal Mounting System, which is compatible with the v4's 1" NPS thread, so the wall doesn't need to change.
Step-by-step diagnosis
Try these in order. Most issues are resolved by Step 1 or Step 2.
Unplug the filter and plug it back in.
This step solves most issues, and the Power LED on the input connector confirms the filter is receiving power.
This solves most problems. Pull the small barrel plug out of the filter, wait about ten seconds, and plug it back in. The Power LED on the input connector should light. The filter takes about thirty seconds to fully reconnect to the network and the connected device.
If the Power LED on the input does not come on after plugging the filter back in, the issue is on the power side. The GigaFOIL v4 uses a 5V / 1A adapter. If you have a multimeter, verify the adapter output reads 5VDC or slightly higher. If the adapter is delivering correct voltage and the Power LED still doesn't come on, the filter has failed and cannot be repaired; contact us about the upgrade path to the ACTIV 10G.
If the Power LED on the input is lit but the connected device cannot reach the network, the input board is alive but the output board (or the internal link between them) may have failed. Continue to the steps below to rule out other causes before assuming the filter is faulty.
Reset the filter and the connected device together.
This step clears any stuck network address on the connected device that the filter reset alone won't fix.
If the filter reset alone didn't help, the device behind the filter (the computer, server, instrument, or whatever the filter is feeding) may be stuck on a temporary network address it gave itself when the connection briefly dropped (called an APIPA address, in the 169.254.x.x range). Unplug the filter and turn off the connected device. Wait ten seconds. Power the filter back on first, give it about thirty seconds to come up, then turn the connected device back on. The connected device will request a fresh network address on startup and rejoin the network normally.
Restart everything from the network side and working downward.
This step restarts the entire chain in the right boot order so each device connects to a healthy upstream connection.
If neither reset worked, restart everything starting from the network side and working downward. Power off the connected device, then unplug the filter, then power off your switch or router. Wait ten seconds. Turn things back on starting from the switch or router, then the filter, then the connected device. Always from the network side downward, with each piece given a few seconds to come fully online before turning on the next.
Check the cable connectors for bent or crushed pins.
This step rules out physical damage at the cable connectors before testing for cable or filter failure.
Look at both RJ-45 jacks on the filter and at the connectors on each cable. Make sure the metal pins are straight and even with no obstructions. If any look bent or crushed, the cable plug or the filter jack may be damaged. Reseat both cables firmly. If you suspect a cable, swap it for one you know works.
Bypass the filter to confirm the cables and the network are good.
This step verifies the cables, the network, and the connected device are all functional. If they all pass and the filter still doesn't, the filter is the cause.
Unplug both cables from the filter and connect them together with an RJ-45 coupler. If the connected device now reaches the network, the cables and network are fine and the filter has failed. If it still doesn't work, the problem is one of the cables, the connected device, or the network, not the filter.
If you don't have an RJ-45 coupler, test each cable separately by using one cable to connect the network directly to the connected device. You may need to either use a longer cable or move the connected device closer to the network connection to do this. If the device reaches the network with one of the original cables, that cable is fine; test the other the same way.
Contact us.
If Steps 1 through 5 indicate the filter has failed, contact us. The GigaFOIL v4 cannot be repaired; we can help you with warranty service if your unit is still under its original two-year warranty, or with an upgrade to the ACTIV 10G, which fits the same 1" NPS threaded penetration in your shield wall.
The ACTIV 10G is the Direct Replacement
When your GigaFOIL v4 reaches the end of its useful life, the ACTIV 10G replaces it using the same hole in the shield wall with no modifications.
| GigaFOIL v4 | ACTIV 10G | |
|---|---|---|
| Shielding Effectiveness | 100dB, 10kHz to 18GHz | >100dB, 10kHz to 40GHz |
| Insertion Loss | 100dB, 10kHz to 18GHz | >100dB, 50Hz to 40GHz |
| Max data rate | 1 Gbps | 10 Gbps |
| Mounting Hole | 1" NPS | 1" NPS (uses Universal Mounting System) |
| Power | 5VDC / 1A | 12VDC / 2A (adapter included) |
| Housing | 20 ga zinc-plated cold rolled steel | Machined aluminum, electroless nickel |
| Warranty | 3 years (original) | 2 years |
Wider Range, Modern Data Rates
The GigaFOIL v4 was built for 1 Gbps Ethernet. The ACTIV 10G supports 10 Gbps and extends the shielding and filtering range to 40GHz, covering 5G, WiFi 6E, and emerging mmWave threats.
Simple Replacement
No need for a new hole or to modify your shield wall. Pull the v4 filter, insert the ACTIV 10G in the same hole, plug in the included 12VDC adapter. Back up and running in minutes.
Better Architecture
The ACTIV 10G uses digital signal processing to remove noise and unwanted artifacts from the network signal. The result is cleaner output and broader interference rejection than the original Gv4 design could deliver.
Reference Documents
Frequently Asked Questions
Ready to Upgrade?
Talk to our engineering team about your installation or request a quote for the ACTIV 10G.