Why is as-built documentation important when troubleshooting an optical network outage?

As-built documentation serves as a crucial reference point in troubleshooting an optical network outage because it provides precise details about the specifications and layout of the fiber optic network. Among these specifics are the exact measurements, including specific cable lengths, which are essential when assessing the physical setup of the network.

In the event of an outage, technicians can use as-built documentation to verify whether the installed cables match the documented lengths. This is vital for identifying possible issues such as excessive loss due to unusually long runs, incorrect splicing locations, or even potential cable damage. Knowing the exact lengths and configurations enables technicians to quickly pinpoint where problems may have occurred and facilitates a more efficient and accurate repair process.

In contrast, the other options, while relevant in different contexts, do not directly contribute to resolving an optical network outage in the same way that accurate cable length data does. Historical performance data, past maintenance issues, and equipment warranties can provide context or insights but lack the immediacy and specificity that as-built documents provide for diagnosing and rectifying current issues in the network.