Riverstone Networks RS 2100 Especificaciones descargar pdf (Pagina 51)

Long-Distance Optical Transceivers

51Continuous Access and Data Replication Manager SAN Extensions Reference Guide

Link power budget

The link power budget is the difference between the minimum optical power

launched from the transmitter and the minimum acceptable optical power at the

receiver input. A link power budget is usually specified in decibels (dBs), and the

sum of all losses in an optical line must be less than this number.

If the fiber cable between the two sites is leased, have your carrier provide you

with the loss in your circuit. If the fiber cable is owned, check the installation

records to ensure that the fiber cable meets the power budget.

Table 24 provides recommendations on how to optimize your long-distance link.

Table 24: Configuration recommendations

Recommendations Implication

Use low-attenuation 9-micron fiber. Best for long distances (preferably less than

0.3 dB loss per km).

Minimize number of connectors. Connectors account for 0.3 dB, or greater,

of signal loss.

Use fusion splices. Minimizes attenuation.

For fibers, from any point of the

optical link, the minimum bending

radius is 3.1 inches during

installation and 2.0 inches

long-term.

Exceeding theses bend radius limitations

can result in fracture of the fiber and in

further attenuation losses.

During installation, avoid extreme

environments, such as excessive

temperature and vibration.

Avoids possible damage to the fiber cable.

During installation, ensure that the

fiber cable is not pinched or pulled.

Prevents compression and stretch to the fiber

cable.

Use measurement tools such as

calibrated light sources, power

meters, and an optical time domain

reflectometer (OTDR).

Verifies optical link losses.

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Riverstone Networks RS 2100 Especificaciones Pagina 51