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Module Descriptions, RFL 9508D Digital Section
8.6
TELEPROTECTION ANALOG AND DIGITAL TRANSCEIVER
Figure 8-14. Physical Arrangement of the Analog and Digital Transceiver
8.6.1
ANALOG TRANSCEIVER DESCRIPTION
The Analog Teleprotection Transceiver is the Power Line Carrier Transmitter and Receiver for the
teleprotection commands. This module includes a modulator and demodulator, digital filtering, a numerical
control Oscillator, analog and digital channel mapping, and an RS232 interface for configuration.
The Analog Teleprotection Transceiver module performs the following functions:
•
Translates and converts the digital baseband source from the T1/E1 digital frame into the frequency
range from 20 kHz to 500 kHz using Single Side Band modulation.
•
Translates and converts the Line Frequencies into digital baseband or the T1/E1 digital frame.
•
Communicates with other T1/E1 modules using the backplane to provide a multi-channel system.
•
Accomplishes Line Frequency programming, configuration, RS232 NMS interface, and
diagnostics.
•
Has automatic Gain Control (AGC) to compensate for variations in signal level caused by line
attenuation variations. If the received level varies by more than 40dB in the regulation range of –20
to +20 dB or –26 to +14 dB from normal, a relay and LED will indicate an alarm. Additionally, the
AGC functions to perform the signal-to-noise squelch, which disables the system and initiates an
alarm under excessive noise conditions.
RFL 9508D UCC
RFL Electronics Inc.
March 11, 2010
8-33
(973) 334-3100