Rf-Converter P4Lt - ABB ETL600 Instruction Manual

ETL600
3.3.3.

RF-Converter P4LT

The module P4LT is the heart of the ETL600 equipment. It performs
the following main functions:
•
Conversion of the signals from LF (Low Frequency) to RF (Radio
Frequency)
•
DPLC modem MOD600
•
Up to four AF modems NSK600
•
Data-multiplexer MUX600
•
Hardware and software supervision for the complete equipment
•
Up to three pilot channels offering the functions:
•
•
•
•
•
•
•
Automatic measurement of the frequency response of the APLC
channels with calculation of the equalizer filters
•
Serial port for entering settings and for supervision by means of
PC, to be connected to the equipment either directly or via a
modem link
•
Up to two integrated teleprotection devices NSD600
•
Bus-master for the ETL600 TDM-bus, for communication to
optional O4LE and G4AI boards
•
Three alarm relays with switch-over contacts for system
alarm/cabinet alarm, hardware alarm and link alarm
•
Two V.24 data interface ports
•
One V.11 data interface port
•
IRIG-B input for synchronization of the internal real time clock
(RTC)
All functions are executed by six DSPs, a microcontroller, a Field
Programmable Gate Array (FPGA) and associated peripheral circuits
such as Analog to Digital Converter (ADC), Digital to Analog Converter
(DAC), Buffer, Driver, Universal Asynchronous Receiver/Transmitter
(UART), Watchdog Device, Random Access Memory (RAM), Flash
Electrically PROgrammable Memory (Flash EPROM), clock oscillator,
±12V supervision, and more.
The frequency conversions AF to RF and RF to AF are implemented
completely with digital signal processing so that no analog filters,
mixers and the like are required, giving excellent thermal stability. This
technique is called Direct Digital Synthesis (DDS).
Structure and Function
1KHW001489-EN
EOC signaling
E- and M-signaling, independently on each APLC channel
AGC (Automatic Gain Control), independently for each APLC
channel
Frequency synchronization
Supervision of the quality of the received pilot signals
Guard signal for integrated teleprotection equipment NSD600
ABB Switzerland Ltd
November 2005 3-23