plc1790b1&2en
DESCRIPTION
PLC1790BTRANSCRIPT
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PLC 1790
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ALSPA PLC 1790B Ed1&2
March 2004
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POWER LINE CARRIER ALSPA PLC 1790B
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POWER LINE CARRIER ALSPA PLC 1790B Ed2
PLC
179
0/C
2 14 20 26 32 4036 45 55 65 76
LED 1 GREEN LED 2 GREEN
LED 4 REDLED 3 GREEN
LED 6 YELLOWLED 5 GREEN
LFS
LED 1 GREEN
LED 2 RED
ALIM
M8 J4
RX
INRX
5 dB
PLC-1
RX
TX
PLC-2
OVF LF0
OVF LF1
OVF A/DRX
TX
RX
RX -5dB
RX +5dB
LFSQUELCH
DSP OK
LOOP
DSP KO
MODAF
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SUMMARY
1. Generalities
2. Characteristics
3. General block diagram
4. LFS
5. CCUN
6. INTE
7. INSU
8. ELNU
9. INAF
10. MODAF
11. AMPL
12. INTX
13. INRX
14. DC/DC Converter
15. Configuration
16. User cables interface
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ACRONYM. MEANING
LFS Low frequency section
CCUN Universal ringing converter
INTE AF transit interface
INSU Network management interface
ELNU Digital signal processing unit
AMPL Amplifier
INAF HF interface
INTX HF transmission filter
INRX Line interface and reception filter
ALIM DC / DC converter
MODAF Audio Frequency Modem
DSP Digital signal processor
CODEC A / D & D / A converter serial type
TPS Selective tele protection
FSK Frequency shift keying
00K On / off keying
1. GENERALITIES
Acronym's List
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1. GENERALITIES
General description
The Alspa PLC 1790B equipment bases its function on the use of DSP(Digital signal processor), either for the AF and HF signals elaboration while the inputs/outputs are still analog.
Frequencies transposition is based on SSB modulation principle with attenuated and calibrated carrier transmitted on line.
The use of DSP improves the performance of the equipment in terms of quality, service and flexibility, reducing meantime thecost and the maintenance operations as well as the hardware volume.
The operator, using a standard personal computer, can easily customize the equipment and performs tests either on-line or off-line from one end of the link.
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1. GENERALITIES
AF Services
Speech and signaling/dialing
Data
Selective teleprotection
HF Medium
Over head power line
Under ground power cable
Facilities
Permanent link control
Integrated party line service on AF side
Possibility of high speed data transmission
Fully programmable
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2. CHARACTERISTICS
Useful bands
HF : 40 to 500 Khz
AF : 300 to 3720 Hz
1 or 2 multipurpose and/or full band transit(simply add one AF board for a 2 channels configuration)
HF frequency arrangement
Programmable by step of 1 Khz using PC
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2. CHARACTERISTICS
Line filters (Tx and Rx)
Customization by hardware for all single or double channels starting 40 Khz up to 500 Khz.
Nominal transmission output
10 / 20 / 40 Watts on HF output (the output can be reduced up to 20 dB lower than the nominal level trough software adjustment).
Power amplifier
Push-Pull type polarized in AB class : nominal output power 20 watts
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2. CHARACTERISTICS
Line hybrid
4 wires : impedance 75 ΩΩΩΩ unbalanced
2 wires : impedance - 75 ΩΩΩΩ unbalanced- 50 / 125 / 150 ΩΩΩΩ balanced or
unbalanced
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3. GENERAL BLOCK DIAGRAM Ed1
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3. GENERAL BLOCK DIAGRAM Ed2
HF Line
LFS-0 (*) MODAF AMPL-1 INTX
INRX
AMPL-2
LF Section HF Section
INTE-0 (*)
#
#
#
#Digital Signal
Analogue Signal
Alternative Units
LFS-1 (*)
#
CH-0
CH-1
INSU (*)PC
RS232
(*) = SERVICE Units
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4. LFSBlock diagram
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4. LFS
Function
Programmable multipurpose Low Frequency board
- manages the following service :
- speech signaling telegraph full band transit
- internal FSK modem analog general purpose TPS interface
Speech
Programmable bandwidth :
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4. LFS
Speech field interface
Programmable for 2 wires or 4 wires by software and hardware
600 ΩΩΩΩ impedance
Levels : adjustable by software at 0,5 dB step
- 4 wires Tx (dBm) Rx (dBm)
- Range +1,5 to -22,5 +7,5 to -23,5
- Default -3.5 -3.5
- 2 wires
- Range +5 to -19 +4 to -34
- Default 0 -7
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4. LFS
Compandor
According to CCITT G162 recommendation
Excludable by software or by external command
Speech limiter
According to IEC 495 specification
Excludable by software
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4. LFS
Signaling
programmable via software as FSK (FC + 30 Hz) type
Transmission and reception idle frequency can be independently changed
Programmable FC
- Transmission criteria : Ground on "M" wire
- Reception criteria : Ground on "E" wireFree voltage contact (SC2)
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4. LFS
Telegraph service
Programmable bandwidth
Line impedance 600 ΩΩΩΩ
Tx / Rx levels adjustable by software from +5 to -33 dBm at 0,5 dB step(-14 dBm for 50 bauds as default value)
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B AU D R A T E C H A N N E L B A N D W IT C H H Z S T A N D AR D50 120 U IT .T R -35 + P ro p rie ta ry
100 240 U IT .T R -37 + P ro p rie ta ry200 360 U IT .T R -38B + P ro p rie tary200 480 U IT .T R -38A600 30 0 à 27 00 U IT .T V -23600 10 80 P ro p rie tary
120 0 30 0 à 34 00 U IT .T V -23
4. LFS Internal programmable modem : MTU
Programmable for IUT.T standard, baud rate from 50 to 1200 bauds
FSK modulation and output level variable following the baud rate (the level can be fixed at 50 bauds)
Only asynchronous transmission mode
Transmission and reception are programmable independently on two different channels (DTR & RTS forcing by switches)
Field interface RS232 / V-24 type
Tx & Rx LED's on LFS board connected respectively to RTS and CR signals
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4. LFS
AF transit "Line 2" access
Programmable for 2 different functions:
- Selective or full band transit
- Analog teleprotection interface
• Warning : whenever selective AF transit is programmed the telegraph service is automatically set at 300 to 3720 Hz bandwidth
Line impedance 600 ΩΩΩΩ
On the receive input from field, a corrector is available to compensate the eventual cable level distortion. 15 presettedcurves are selected by software configuration.
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4. LFS
AF Transit "Line 2" levels
For teleprotection function :
- Tx/Rx : adjustable from +3 to -35 dBm
For transit function :
- Speech Tx/Rx +3 to -35 dBm at 0,5 dB step nominal -18 dBm
- Data Tx/RX -7 to -45 dBm at 0,5 dB step nominal -28 dBm for 50 bauds
- Signaling Tx/Rx -7 to -45 dBm at 0,5 dB step nominal -28 dBm
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4. LFS
LF equalizer
Available on the receive line from HF section
The operator can test automatically the HF line response and equalize eventually the receiver, adjusting eight different filters
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5. CCUN
Function :
Call and receive signal converter (E and M) for a two wires telephonic connection.
Double circuits unit (only one board for two channels)
Applications (programmable by soldering straps).
PLA-C long line extension exchange side
PLA-T long line extension telephone side
BC central battery (hot line)
BL local battery
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5. CCUN
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5. CCUN
Characteristics
Ringing current frequency 45 + 5 Hz
Ringing voltage 50 à 80 VRMS on 3 K ΩΩΩΩ
Subscriber voltage 30 VDC
Microphone current 25 à 35 mA
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6. INTE
Function :
AF full band transit interface.
Double circuits unit (only one board for two channels)
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6. INTE
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7. INSU
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7. INSU
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8. ELNUDSP / CODEC DIGITAL LINKS
»TDM=Time-division Multiplexing
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8. ELNU
ELNU digital signal elaboration
The following functions are performed:
Synchronism generation and carrier digital synthesis of HF channels.
These functions are supported by:
• Main oscillator, which generates the master clock
• Centralized logic to provide for the machine timings
• Generation of HF mo-demodulation carriers.
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8. ELNUELNU : Tx operation principle
• Synchronism and exchange of data coming from channels 1 and 2
• Modulation of channels 1 and 2
• Sum of the two communication channels and carrier
• Transmission level adjustment
• Sampling frequency increase from 32 to 2048 kHz
• HF band allocation
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8. ELNUELNU : Rx operation principle
• Demodulation of digital signal received from INAF board
• Reduction of the sampling frequency from 1024 to 16 kHz
• Demodulation and carrier drop for automatic level control (AGC)
• Channel 1 and channel 2 demodulation:
• Synchronism and exchange of serial data to be sent to channel 1 (LFS 0)
• Synchronism and exchange of serial data to be sent to channel 2 (LFS 1 fordouble channel PLC terminals).
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8. ELNU
HF Line alarms (M8)
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9. INAF
BLOCK DIAGRAM
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10. MODAF
BLOCK DIAGRAM
DSP 56302Motorola
FLASHMemory
FLASHMemory
EEPromMemory
TRASMISSION [ 1 ]
TO AMPL.1
TO AMPL. 2
D / A
TXtest point
RECEPTION
A / D
D / A
FROM RXFILTER
AGCCONTROL
AGCRX
test point
BUS
I/O 16 bit
ALARMSCRITERIA
TXRX+5 dB / -5dBPLC / PLC1
POWER SUPPLY
I/O 16 bit
LFS-0
LFS-1
INSU
SSI LINK
PC LINK
FPGAXilinx Spartan
IIE
WD
TPS OUT
P/S
7 dB
TPS 12-16 kHz Output
D / A7 dB
P/S
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11. AMPL
BLOCK DIAGRAM ( 20 Watts power amplifier )
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12. INTX
BLOCK DIAGRAM
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13. INRX
BLOCK DIAGRAM
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14. DC/DC CONVERTER
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(* Optionnal)
UNIT QUANTITY POS.
10 WATTS 20 WATTS 40 WATTS SUBRACK
ALIM. DC/DC 1 1 1 A
INSU* 1 1 1 E
ELNU 1 1 1 F
INAF 1 1 1 G
AMPL 1 H
AMPL 1 1 1 I
INTX 1 1 1 L
INRX 1 1 1 M
15. CONFIGURATION Rev1
Equipment configuration
Basic configuration
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(* Optionnal)
UNIT QUANTITY POS.
10 WATTS 20 WATTS 40 WATTS SUBRACK
ALIM. DC/DC 1 1 1 A
INSU* 1 1 1 E
Empty F
MODAF 1 1 1 G
AMPL 1 H
AMPL 1 1 1 I
INTX 1 1 1 L
INRX 1 1 1 M
15. CONFIGURATION Rev2
Equipment configuration
Basic configuration
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APPLICATION CONFIGURATION LFS0 LFS1 CCUN INTE
1 Multipurpose channel 1 LFS D
1 Multipurpose channel with 2 wires speech interface 1 LFS + CCUN D C
1 Full band transit channel 1 INTE D
2 Multipurpose channels with 2 wires speech interface 2 LFS + CCUN D B C
2 Full band transit channels 1 INTE D
1 Multipurpose channel + 1 Full band transit channel 1 LFS + INTE D B
1 Multipurpose channel with 2 wires speechinterface + 1 Full band transit channel
1 LFS + CCUN + INTE D C B
15. CONFIGURATION
LF Configurations
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16. USER CABLES INTERFACE Ed1
Field connectors arrangement (front view)
All the field connectors are located in front of the equipment
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16. USER CABLES INTERFACE Ed2
Field connectors arrangement (front view)
All the field connectors are located in front of the equipment
PowerSupply
M3 LF1Sp/Sig/L2
M2 LF0Sp/Sig/L2
M5 LF1MTU
M4 LF0MTU
M37O.C. ALARMS
M38ALARMS
M9TPS
M7INSU R.C.
M6P.C.
J4TESTPOINT
J1HF LINE
M38 J5COAX. CABLE
J2PLC HF
LINE
J3PLC DUMMY
LOAD
M10 LF0TELEGRAPH
3 x I/O
M32 LF1TELEGRAPH
3 x I/O
M40 LF0TELEGRAPH
1 x I/O
M41 LF0TELEGRAPH
1 x I/O
M13-M14
M15-M16
M17-M18
RA
CK
ALA
RM
S
(-) A (+) BPowerSupplyGround
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16. USER CABLES INTERFACE
Field connectors arrangement (front view)
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