Cisco Prisma II Hybrid Amplifier Informações Técnicas descarregar pdf (Página 76)

S-QAM FS TX Operation

 Transmitter gain is controlled through the selection of Manual or Automatic

Gain Control (AGC) mode operation.

 In Manual mode, an attenuator can be used to reduce RF power. It may

be desirable to make such adjustments to compensate for power

differences if the channel load differs from the specified value.

 In AGC mode, the microprocessor monitors the actual input composite

power and adjusts the attenuator to maintain constant RF drive level into

the laser diode.

Note: If Analog or QAM loading is to remain constant – not expanding

using AGC is OK however IF channel load differs the AGC will self

adjust accordingly resulting in RF level change at Node RX.

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Cisco Prisma II Hybrid Amplifier Informações Técnicas Página 76