I need some assistance. I have a customer that is off a fiber node (only 2 customers off the node and no way to easily combine onto another node) that recently went offline and no other modems will connect. The other customer is connecting just fine. I have a Trilithic 1G DSP meter and I cannot get the cm on the meter to connect, it will get the DS signal, but will not range to the upstream frequency. Funny thing is, I even tried it on the other customer's drop (the one that is online) and it won't connect. I take it to any other drops on different nodes and no issues.
RF levels are fine,(the one customer online is 5db DS and 41db US) Optical levels are good. I can't get anything else to connect. I've replaced the tap, everything but the node. Could it be the node?? Any suggestions and help would be appreciated.
Sounds like reverse issues. Is the trouble customer on a different feeder leg than your working one? Bad reverse amp in a trunk amp or line extender? Bad filters or splitter / dc at the premises?
Will the Trilithic connect up off the test ports on the node casing and laser modules themselves?
No one has any suggestions???
We ran into a similar situation recently and still don't know exactly what caused it, but it was in a node that had more than one upstream on it. What we did to diagnose it was to turn off one of the upstreams then all of the modems came up, then we replaced the entire combining network feeding that node and the problem has stayed gone. I think it was a bad ATX Splitter/Combiner but haven't proved that.
So if you have multiple upstreams try making one upstream for testing purposes and if that solves it look at the combining network very closely.