Although most optical return path receivers come equipped with built-in test points, there are several reasons not to use them. The first is a possible difference in connectivity. This difference would require either specialized test cables or adapters. The second and more costly reason is possible damage to the receiver test port, forcing replacement of the entire optical receiver, entailing cost for both equipment and downtime. If the port is damaged, the device can be easily replaced Amplification Complex broadband networks often require much more than just passive combining and splitting.
Passive components can attenuate forward or return path signals, making amplification necessary.
If amplifiers are required, they should allow monitoring of input and output signals and minimize contributed noise. Modularity and redundant powering are also important for maximum system availability. Putting it all together Critical services demand 100 percent uptime. Ensuring constant uptime and quality of service is quickly becoming a management issue, rather than simply an engineering issue. Attenuation and monitoring are critical to managing return path signals within the headend.