FAQ
TL;DR: 1 Ethernet cable carries PoE and data; "if the PINS in the Ethernet connector are damaged, data transmission may not work." Skip firmware fixes, test a direct PC link, and treat it as hardware first. [Elektroda, matek451, post #20469556]
Why it matters: This FAQ helps T‑Mobile 5G Home Office users diagnose ODU/IDU "connected but no internet" issues and decide when repair or swap beats a firmware chase.
Quick Facts
- The ODU–IDU Ethernet run doubles as the PoE feed; damaged RJ45 pins can power radio yet break data. [Elektroda, matek451, post #20469556]
- Direct ODU‑to‑PC test showing “Ethernet cable not connected” points to a failed ODU Ethernet port. [Elektroda, matek451, post #20469443]
- Reported out‑of‑warranty replacement quote: PLN 1,700 when classified as mechanical damage. [Elektroda, franieczek, post #20468619]
- The kit remains T‑Mobile property until the last subscription fee is paid. [Elektroda, matek451, post #20469977]
- ODU lacks Bridge mode and signal diagnostics; the bundled IDU router is limited. [Elektroda, matek451, post #20470234]
How do I quickly diagnose “ODU shows 4G, IDU blinks, no internet”?
Diagnose the Ethernet link first, not firmware. 1. Ensure the ODU is powered. 2. Connect a PC directly to the ODU, bypassing the IDU. 3. If the OS shows “Ethernet cable not connected,” the ODU Ethernet port is damaged. That is a hardware fault, not a software issue. [Elektroda, matek451, post #20469443]
Can uploading new software/firmware fix this ODU issue?
No, firmware will not repair a bad Ethernet jack. The radio can attach while PoE works, yet data fails on broken pins. As one expert notes, “if the PINS in the Ethernet connector are damaged, data transmission may not work.” Replace or repair hardware instead. [Elektroda, matek451, post #20469556]
How do I test the cable versus the ODU Ethernet port?
Swap in a different Ethernet cable and observe LEDs near the ODU connector and power unit. If power and LTE/5G LEDs light, the radio link is up. If devices still show no Ethernet link or data, suspect damaged RJ45 pins or the ODU port. [Elektroda, matek451, post #20469556]
I can’t reach 192.168.x.x on direct connection—what does that point to?
If your PC shows “Ethernet cable not connected” when cabled directly to the ODU, the ODU’s Ethernet port is faulty. Without a physical link, no IP address or web UI can be reached. Replace the port or the unit to restore connectivity. [Elektroda, matek451, post #20469443]
Is RJ45 port replacement on the ODU possible, and who can do it?
It is possible, but finding a shop that will swap the damaged RJ45 is difficult. An experienced user notes that practically no one offers this service. If you locate a specialist, ask about warranty implications and sealing. [Elektroda, matek451, post #20470234]
How much might an out‑of‑warranty ODU replacement cost?
One user was quoted PLN 1,700 when T‑Mobile classified the fault as mechanical damage. Your cost can differ by contract and assessment. Use this as a ballpark when considering third‑party repair versus carrier swap. [Elektroda, franieczek, post #20468619]
Does the ODU support Bridge mode or provide signal diagnostics?
No. “No Bridge mode on the ODU, no signal diagnostics,” which limits integration with stronger routers and hinders RF analysis. Expect a basic, locked setup geared for plug‑and‑play rather than advanced tuning or monitoring. [Elektroda, matek451, post #20470234]
Who owns the hardware during the contract? Can I open it?
The T‑Mobile 5G Home Office set remains the operator’s property until the final subscription fee is paid. Before modifying or repairing the unit, contact T‑Mobile for guidance to avoid contractual issues. [Elektroda, matek451, post #20469977]
I reported a fault right away—does T‑Mobile swap the ODU quickly?
A user who had a SIM detection fault reports the ODU was replaced in a few days at no cost. Early reporting and clear fault description can speed resolution. Escalate promptly if the unit is defective on arrival. [Elektroda, XdekHckr, post #21203809]
Why does the app say “Internet connected” while devices have no data?
PoE can power the ODU and let it attach to LTE/5G, lighting the radio LEDs. If RJ45 pins for data are damaged, Ethernet frames never reach the IDU or your PC. The app reflects radio status, not LAN link health. [Elektroda, matek451, post #20469556]
What LEDs should I check to separate radio access from Ethernet issues?
Verify the power LED and one LTE/5G LED on the ODU or near the injector. Lit radio LEDs mean the modem is on‑air. If there’s still no Ethernet link, focus on the cable and the ODU RJ45 port integrity. [Elektroda, matek451, post #20469556]
Is the bundled IDU router worth keeping, and what alternatives exist?
The bundled IDU is weak and the ODU is limited. One expert calls it “overall a failure compared to the 5G CPE from ZTE, i.e. MC7010.” If your plan allows, consider a stronger 5G CPE for better routing and Wi‑Fi. [Elektroda, matek451, post #20470234]
