In plain English
It means the receiving side has stopped sensing any signal arriving over the link. The key point is that this is about detection at the receiving end: an incoming transmission is no longer being detected there.
In context
Here, LOS labels or reports that the ONT or modem is no longer detecting the incoming signal on the fiber link.
- Situation
- Installing broadband, activating service, using routers, and reading connection status
- What it communicates
- labels or reports a fiber-link problem on an ONT or modem.
Meaning limits
By itself, the term does not say why the incoming signal is not being detected or what outcome will follow.
Examples
“Only the receiving end showed LOS; the transmitter at the other end was still on.”
“During the check, the ONT reported LOS on the fiber link.”