NovaStar CVT4K: optical link and missing LED output

Read the full converter designation and the optical module identification at both ends. An LC connector alone does not identify the required fiber or establish compatibility: distinguish CVT4K-S from CVT4K-M first.

The cited specifications cover CVT4K-S and CVT4K-M. S specifies dual-fiber OS1/OS2 single-mode, 9/125 µm and a 1310 nm module; M specifies dual-fiber OM3/OM4 multimode, 50/125 µm and an 850 nm module. If the label differs or the modules have been replaced, identify that combination before applying these values.

1. Before touching connections, record the controller model and firmware, CVT4K variant, module references, fiber, ports and route. Check the controller documentation for support of that converter and those modules. Optical ports on both devices do not prove compatibility.
2. Observe PWR and STAT. For the two documented variants, steady red PWR indicates normal power and flashing green STAT indicates normal device operation. If they do not show these states, check power and startup before blaming the fiber. Do not hot-plug PowerCON: page 4 prohibits it.
3. Compare the fiber type, two strands and LC connectors with the identified variant. Note the specified fiber-selection limits: S, insertion loss ≤0.3 dB; M, ≤0.2 dB; both, return loss ≥45 dB. These are selection specifications, not measurements of the installed link.
4. During a test window, replace only the fiber segment with a previously verified cable of the correct specification, keeping the same ports and modules. Do not look into fibers or optical ports. Observe the green indicator of the OPT port in use: steady means a normal optical connection according to the specification; it does not yet prove a correct picture on the screen.
5. If the indicator changes with the test segment, record the difference and inspect the original cabling. If it does not, the far end, module and compatibility of the combination still need checking. Restore the recorded connection if there is no improvement, and keep the link out of the live signal path until an image test is complete.

Check the OPT2 path first: both specifications assign it to signal ports 9–16. OPT1 corresponds to 1–8. Connecting only the OPT1 path does not check whether data reaches the second group.

OPT3 backs up OPT1, and OPT4 backs up OPT2. They are not two additional groups of eight outputs. The ETHERNET port in the CONTROL section connects a control computer; the type-B USB port is also for control and is not used to cascade converters.

1. Record the diagram and save the current controller configuration using the tool for its model. Identify which controller output feeds each CVT4K OPT port; this guide does not establish matching port numbers on another device.
2. Compare the CVT4K OPT1 and OPT2 indicators. Steady green means a normal optical connection. If OPT1 has that state and OPT2 does not, start with the second optical path and its fiber variant, without changing receiving cards or the screen map yet.
3. Choose one affected port among 9–16 and one working port among 1–8. On signal ports, steady green indicates an Ethernet cable connection, flashing yellow indicates data transmission, and steady yellow indicates no data transmission. Record each color separately: a physical link does not mean data is arriving.
4. With OPT2 normal, if the affected port has steady green and steady yellow, check whether the controller is sending data through that path. If green link indication is absent, test its Ethernet segment with a previously verified cable, keeping the same port number. If data is being transmitted but there is still no picture, continue to the receiving cards, cabinet wiring and documented configuration of that screen.
5. Change one item at a time during the test and record its effect. Restore the previous connection if there is no improvement. Before taking the signal live, check both groups with a recognizable image and the intended map; indicators do not prove that content is reaching the correct cabinet.