Cisco Systems 15530 Configuring VOA Module Interfaces

CHAPTER
6-1
Cisco ONS 15530 Configuration Guide and Command Reference
78-14227-01, Cisco IOS Release 12.1(10)EV2
6
Configuring VOA Module Interfaces
This chapter describes how to configure the VOA modules supported by the Cisco ONS 15530. These
modules allow the Cisco ONS15530 to extend the internodal distances and numb er of nodes supported
for point-to-point, hubbed ring, and meshed ring topology networks.
This chapter includes the following sections:
•About Variable Optical Attenuation, page 6-1
•Configuring VOA Module Interfaces, page 6-5
•Configuring Attenuation, page 6-5
•About Optical Thresholds, page 6-6
•Configuring Optical Receive Power Thresholds, page 6-7
About Variable Optical Attenuation
The attenuation typically occurs on the input side of the EDFA (erbium-doped fiber amplifier) so that
the input power of each band transmitted to the EDFA is equalized . The V O A modules can als o attenuate
OSC channels, EDFA output (when preamplifying), or individual data channels.
The Cisco ONS15530 supports two types of VOA modules:
•PB-OE (per-band optical equalizer) modules
•WB-VOA (wide-band variable optical attenuator) modules
A PB-OE module selects one or two bands of channels to attenuate and passes on the re st of the signal.
WB-VOA modules attenuate all the channels it receives.
Figure 6-1 illustrates the use of PB-OE and WB-VOA modules to perform band based power
equalization.