Rad-data-comm T1 Manual do Utilizador descarregar pdf (Página 18)

Chapter 1 Introduction FOM-E1/T1 Installation and Operation Manual

1-4 Functional Description

Signal Conversion

Conversion of the electrical signal into an optical signal takes place by using an

infrared light-emitting diode or laser transmitter. At the opposite end of the fiber,

the optical signal is converted back into an electrical signal and amplified to the

required level.

Data/Clock Recovery

To recover data and clock from the signal, a Phase Locked Loop (PLL) circuit is

utilized. FOM-E1/T1 provides internal selection for the E1/T1 electrical interfaces.

Data Transfer

The optical signal is linked to the fiber-optic media and transmitted via the optical

link to the remote unit. A high sensitivity pre-amplifier and an AGC (Automatic

Gain Control) circuit enable the remote unit to receive the optical signal. The

output of the receiver is applied to the clock recovery circuit and the data

regeneration circuit, which in turn apply it to the electrical interface driving circuit.

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Rad-data-comm T1 Manual do Utilizador Página 18