Cisco Cisco Prisma II EDR Receiver Installation Guide

Glossary

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information includes device features, data throughput statistics, traffic overloads, and errors.

nanometer. One billionth of a meter.

NMS

network management system. A software system designed specifically to monitor a network

and to facilitate troubleshooting.

OMI

optical modulation index.

PLL

phase lock loop. An electronic servo system controlling an oscillator to maintain a constant

phase angle relative to a reference signal.

QAM

quadrature amplitude modulation. A phase modulation technique for representing digital

information and transmitting that data with minimal bandwidth. Both phase and amplitude

of carrier waves are altered to represent the binary code. By manipulating two factors, more

discrete digital states are possible and therefore larger binary schemes can be represented.

radio frequency. The frequency in the portion of the electromagnetic spectrum that is above

the audio frequencies and below the infrared frequencies, used in radio transmission systems.

RMA

return material authorization. A form used to return products.

remote terminal. Remote equipment of a supervisory system.

receive or receiver.

SBS

stimulated Brillouin scattering. The easiest fiber nonlinearity to trigger. When a powerful

lightwave travels through a fiber, it interacts with acoustical vibration modes in the glass.

This causes a scattering mechanism to be formed that reflects much of the light back to the

source.