• Author / Uploaded
• b33law

Citation preview

Power Line Carrier ETL Family Training Program

Power Line Carrier Communication ETL

ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL; NSD50; NSK5 TRAINING PROGRAM 1.

PLC OVERVIEW

2.

PLCC OVERVIEW

3

ETL OVERVIEW

4

ETL BLOCK DIGARM &PROGRAMMING

5

TESTING FACILITIES

6

ETL TESTING

ABB Power System Communications

Power Line Carrier ETL Family Training Program

PLC OVERVIEW

ABB Power System Communications

PLC OVERVIEW

Power Line Carrier ETL Family Training Program

DIFFERENT OPTIONS FOR POWER UTILITY COMMUNICATIONS Atmospheric conditions, • MICROWAVE • UHF/VHF SYSTEMS

High Capital Cost Atmospheric conditions, high capital cost, high maintenance Congested frequency band

• RADIO LINK • FIBRE OPTIC

Mechanically High cost for lowweaker, traffic High theft chances

• TELEPHONE CABLE • POWER LINE CARRIER COMMUNICATION (PLCC)

ABB Power System Communications

PLC OVERVIEW

Power Line Carrier ETL Family Training Program

ADVANTAGES OF POWER LINE CARRIER COMMUNICATION • COMPACT • RELIABLE • COST EFFECTIVE FROM DISTANCE POINT OF VIEW • ENTIRELY WITHIN POWER UTILITY’S CONTROL • IMMUNITY FROM ATMOSPHERIC CHANGES

ABB Power System Communications

Power Line Carrier ETL Family Training Program

PLCC OVERVIEW

ABB Power System Communications

PLCC OVERVIEW

Power Line Carrier ETL Family Training Program

Phase to Ground System ABB Power System Communications

PLCC OVERVIEW

Power Line Carrier ETL Family Training Program Line trap blocks PLCC signal entering into switch yard equipment

CC blocks high voltage 50Hz power entering into the PLCC terminal

Earth Coil, LA are for protections for leakage /surges and earth switch for maintenance purpose

Phase to Phase System ABB Power System Communications

BT & LMU matches the PLCC terminal impedance to the line impedance

PLCC OVERVIEW

USER INTER FACES

POWER SUPPLY

Power Line Carrier ETL Family Training Program

MODEM

FREQUENCY GENERATION UNIT

ABB Power System Communications

POWER AMPLIFIER

CONTROL UNIT

LINE INTERFACES

PLCC OVERVIEW

Power Line Carrier ETL Family Training Program

FEATURES REQUIRED FOR POWER SYSTEM COMMUNICATIONS: • ROBUSTNESS AGAINST ALL KINDS OF INTERFERENCE • DIRECT INTERFACING TO POWER SYSTEM SERVICES e.g PROTECTION , TELECONTROL • HIGH FLEXIBILITY OF NETWORK CONFIGURATION • INETERFERENCE OFFERED TO OTHER EQUIPMENTS

• IEC HAS SPECIFIC STANDARD (IEC 495) FOR PLCC TERMINAL

ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL OVERVIRW

ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL OVERVIEW

LT

LT

C

C FA X

ETL

ETL

FAX

PR

PC

MS

M

DC

M

PAX

FAX

PR

C = Coupling Device DC = Dispatcher's console FAX = Facsimile equipment LT = Line trap M = Modem

ABB Power System Communications

PC

MS RTU PAX PR PC

RTU

FAX

= Master station = Remote terminal unit = Private automatic exchange = Protection relay = Computer

Power Line Carrier ETL Family Training Program

P7LB

P7LA

ETL OVERVIEW

ABB Power System Communications

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

ETL FAMILY PLCC TERMINAL : ETL-4X FOR 1 TO 4 CHANNELS TOTAL POWER 40W ETL-8X FOR 1 TO 4 CAHNNELS TOTAL POWER 80W

PROTECTION

: NSD-50 FOR 2/4 CODED/UNCODED COMMANDS SIGNALLING CAN BE USED IN ETL RACK ONLY EQUIPMENT

MODEM

: NSK-5 FULLY PROGRAMMABLE RS232 MODEM WITH MAX 2400 BAUD RATE. CAN BE ACCOMO-DATED IN ETL RACK OR STAND ALONE USE POSSIBLE

ABB Power System Communications

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

MODULAR EQUIPMENT ARCHITECTURE • SINGLE / DOUBLE / TRIPLE AND FOUR CHANNELS OPERATION • DOUBLE / TRIPLE AND FOUR CHANNELS BY ADDING TIERS • DIFFERENT TRANSMIT POWERS AVAILABLE SELECTABLE ACCORDING TO NOISE LEVEL IN POWER LINES - 40 W / 80 W

• THE MODULES ARE FUNCTIONALLY ORGANISED

ABB Power System Communications

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

FEATURES •

INTEGRATED TELEPROTECTION EQUIPMENT TYPE NSD-50 (OPTION) INTEGRATED FSK MODEM TYPE NSK-5 (OPTION) MEETS OR EXCEEDS IEC495/IEC663/IS9482/IS10706 MEETS OR EXCEEDS LATEST IEC ON EMC/EMI COMPLIANCE FULFILLS ISO9001 QUALITY SYSTEM

ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL OVERVIEW

P7LA P7LB P7LB

15 ASA Units

ETL 41 Single Channel 40 Watt

ETL 42 Double Channel 40 Watt

ABB Power System Communications

P7LB

13 ASA Units

P7LB

P7LA P7LA

ETL 81 Single Channel 80 Watt

P7LA P7LA P7LB

19 ASA Units

P7LA

9 ASA Units

Standard Versions

P7LB ETL 82 Double Channel 80 Watt

Power Line Carrier ETL Family Training Program

ETL OVERVIEW

P7LB

P7LB

P7LB P7LB

27 ASA Units

P7LA

P7LA P7LA

P7LB ETL 44 Four Channel 40 Watt

ABB Power System Communications

P7LB P7LB

31 ASA Units

Versions for 3 or 4 channel operation

P7LB ETL 84 Four Channel 80 Watt

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

ADDITIONAL VARIANTS: AF SECTION: 5 SLOTS RESERVED A COMBINATION OF FOLLOWING IS POSSIBLE

§One 2/4 Pax Interface/4w Pax Interface/ Remote Subscriber Interface;each having programmable cutoff filter from 1800HZ to 3400HZ in any one of the 5 slots

§1 to

5 Telecontrol Interfaces each with 3 isolated I/P & O/P in any of the 5 slots; each inteface with (optional) programmble transit filter for fre. from 360 hz to 3720 hz (steps of 60hz) for 1 I/P or any combination of O/P

§Protection Signalling equipment (NSD50) with 2 or 4 commands (fixed slots 1st or 1st &2nd)

§1 to 5 Modems with RS232 Interface (NSK-5)in any of the 5 slots ABB Power System Communications

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

ADDITIONAL VARIANTS: PILOT: SELECTABLE FROM 3780 HZ / 2160HZ /2640HZ / 3360HZ / 3600HZ

RF PROGRAMABILITY:

EASY TO TUNE THE SET IN EITHER 40 TO 100KHZ OR 100 TO 500KHZ IN A RASTER OF 4KHZ

RF TERMINATION:

75OHM, 125OHM

ABB Power System Communications

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

ABB Power System Communications

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

FREQUENCY SYNTHESIZER CARD POWER USER (AF) POWER SUPPLY &LINE ETL: PLCC TERMINAL INTERFACES AMPLIFIER INTERFACES P4LG: FOR 1ST O4LA: AND 3RD CHANNEL INTERFACE MODEM TELECONTROL INTERFACES O4LA, O4LB P4LI: FOR 2ND AND 4 RTH CHANNEL P4LB,P4LC, B5LA: 48 VOLT O4LB: 4WIRE PAXSTABILISER INTERFACE P1LA O4LC, O4LD P4LD,P4LE O4LC:2/4 WIRE PAX INTERFACE E5LA/E5LB -------------------P4LF B4LA:48 VOLT DC DC CONVERTOR O4LD: 2WIRE PAX-SUBSCRIBER INTERFACE P3LA/P3LB NSD50,(G4AA,G4AC) NSK5(G4AE/G4AF) NSK5: ETL OPTIONAL IN RACK MODEM G4AE/F: PROGRAMMABLE MODEM POWER AMPLIFIER & LINE INTERFACES MODEM SECTION P1LA: POWER AMPLIFIER CONTROL CARD FREQUENCY CARD NSD50: ETL IN RACK OPTIONAL P4LB: P4LA AF MULTIPLEXOR + AFP4LG/P4LI TO IF1 AND BACK POWER SUPPLY PROTECTION SIGNALLING EQP. E5LA:100KHZ TO 500KHZ P4LC:IF CONVERTOR IF1TX TOFILTER IF2 AND BACK B5LA G4AA: INTERFACE E5LB: 40KHZ 100KHZ TX IF2 FILTER P4LF: TX DSP RFTO CONVERTOR TO RF B4LA G4AC/D: COMMAND INTERFACE P3LA: P4LD:RF RXHYBRID RF CONVERTOR RF TO IF2 P4LE: RX RF CONVERTOR SECOND CHANNEL

ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL OVERVIEW

Speech 3.4 kHz Speech 3.2 kHz

Programmable 2 wire / 4 wire speech bandwidth

Speech 3.0 kHz Speech 2.8 kHz Speech 2.6 kHz Speech 2.4 kHz Speech 2.2 kHz Speech 2.0 kHz

plus

0.3

3.6

4.0 kHz

3.6

4.0 kHz

NSD 50 4-command teleprotection 0.3

2.0

plus Speed

50 Bd

NSK 5 programmable FSK data transmission

100 Bd 200 Bd 300 Bd

Center frequency 120 Hz steps

600 Bd 1200 Bd 2400 Bd

0.3

ABB Power System Communications

3.6

4.0 kHz

Power Line Carrier ETL Family Training Program AF Bus layout

ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL OVERVIEW

2 4

E& M

E &M

4

ABB Power System Communications

2

O4LD

4

O4L B 4

ETL E& M ETL

E&M

ETL

P AX

4

O 4 LD

E& M

O 4LD

4

ETL

2

O 4 LD

ETL

2

E& M ETL

E&M

E& M P AX

O 4L B 4

PA X

4

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

2 SLIDES FOR FREQUENCY MODULATION SCHEME

ABB Power System Communications

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

IMAGE FREQUENCY ( fs+2fi )REJECTION ADJACENT CHANNEL REJECTION (SELCTIVITY)

SUPERHET RECEIVER

LET’S TAKE SIGNAL FREQUENCY = fs = 300KHZ

DETECTOR TWO RECEIVERS WITH TWO DIFFERENT IFIF FREQUENCY To have advantages of both low and high IFtoETL uses MIXER Since it is easy make a fi Since it is difficult to make fo-fs fs (2ND IF STAGE (DEMODULA RF STAGE multiple stages of modulation. r a filter tuned to 16 KHZ DEMODULAa filterIFtuned to 624 KHZ = fi = 16KHZ = 624KHZ fo IF = fi-TOR) TOR) THE MIXER MAY HAVE AT ITS INPUT which THE MIXER MAY HAVE AT ITS INPUT rejects 12KHZ; which rejects 620KHZ fo+fs FOLLOWING FREQUENCIES: FOLLOWING FREQUENCIES:

The use of multiple stages makes the RF programming adjacent rejection fs = 300 KHZ, fsa = 304 KHZ AND fs = 300 KHZ,channel fsa = 304 KHZ AND completely; adjacent fs+2fi =300 +2x16=332KHZ fs+2fi =300 +2x624=1548KHZ easily possible. is easy. Butfo332KHZ mayCOAXIAL channel rejection is 300KHZ will The oscillator freq. For The oscillator freq. For 300KHZ will INPUT be 300+16=316KHZ. be 300+624=924KHZ. present at input and difficult. But 1548KHZ (of Hence the O/P of mixer will have Hence the O/P of mixer will have further RF O/P may for I/P strength O/P will contain for I/P O/P stage will contain significant ) AF SECTION OSCILATOR of this have component presence at 16input is ruled 300 (316-300) 300 624(924-300) 304 12 (316-304) 304 620(924-304) causing poor image out Good image frequency 332 16 (332-316) 332 624 (1548-924) frequency rejection. rejection. ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL OVERVIEW Channel 2

AF Interfaces NSD50 Teleprot.

Channel 3 & 4

Basic equipment

B4LA +12V -12V + 5V

NDD SP AF-Bus P4LB SA

NSK 5

MO

MO

P4LF

VFT-mod

Telecontr.

Main Power Supply

MO

Pilot P4LA

Alarm Supervision

B5LA

E5LA

PA P1LA P3LA

P4LG

MO DE SA

Power amplifier

H

dB Tel. DE

DE

P4LC

P4LD

DE

Option

Channel 3 & 4 Channel 2

ABB Power System Communications

ND D SP

Converter Converter Summ.Amplifier AF-Channels Non-disconnectable Disconnectable Speech

PA H

Power amplifier RF-Hybrid

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

Basic terms Absolute power level L

[dBm]

The absolute power level L defines by how many dB a signal strength Px is greater or less than the reference power P0 = 1 mW: Px

L = 10 log ------

[dBm]

1 mW

Absolute voltage level Lu [dBu] The absolute voltage level Lu defines by how many dB a signal voltage Ux is greater or less than the reference voltage U0 = 775 mV: Lu = 20 log

ABB Power System Communications

Ux

------775 mV

[dBu]

ETL OVERVIEW

Power Line Carrier ETL Family Training Program

Basic terms Conversion to another system impedance If the voltage level is measured at a correctly terminated point of the system and referred to 600 Ohm, the value of Lu is the same as the power level L. The value must be converted as follows for other impedances Z: 600 Ohm Lu [dBu] = L [dBm] - 10 log

-------Z [Ohm]

Example: The power level at the 75 Ohm RF O/P of a PLC equipment is given as 40 dBm. What is the voltage level Lu? 600 Ohm Lu = 40 dBm - 10 log

-------- = 31 dBu 75 Ohm

Modern power measuring instruments permit the reference impedance to be set and the level referred to 600 Ohm can be directly read from them.

ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL OVERVIEW

Basic terms Relative level Lrel

[dBr]

The relative level Lrel is used, in order to define the performance of a communications system regardless of channel loading. The dBr value defines the magnitude of the difference in level with respect to the (virtual) reference point (0dBr). Previously the two-wire I/P was taken as the reference point in telephony systems, which corresponds to the I/P of the AF hybrid in a PLC system. As with the dBm value, the relative system level (dBr) is equivalent to a power level. Absolute signal level Lo [dBmo] In order to compare signal in relation to acommon base level they are defined in relation to asystem ref. Point with a relative level of 0dBr.

ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL OVERVIEW

Power allocation to speech and VFT channels AF signals

Signal levels

dBm0

Absolute voltage levels at the test sockets TXAF (-10 dBr) Weighting

dBu

Speech test tone 800 Hz Internal test tone 1000 Hz

0

1.0

-10

Speech with safety margin

+3

1.41

-7

VFT channels and modems 50 Bd 100 Bd 200 Bd 600 Bd 1200 Bd, V.23 1200 Bd + speech 2400 Bd

-14 -11 -8 -3 0 -3 0

0.2 0.28 0.4 0.71 1 0.71 1.0

-24 -21 -18 -13 -10 -13 -10

Max. permissible load with speech plus superimposed channels

+10.8

3.48

+0.8

Pilot tone

-6

0.5

-16

ABB Power System Communications

ETL BLOCK DIGARM & PROGRAMMING

Power Line Carrier ETL Family Training Program

WHY THE PILOT IS STRONGER IN ETL? MULTI PURPOSE PILOT

• AGC FUNCTION • SIGNALLING • GUARD SIGNAL FOR TELEPROTECTION

• SYNCHRONISATION • AS TELEPHONY SIGNALLING CHANNEL • REF. FOR SIGNAL QUALITY CHECK

• REMOTE LOOP CHECK

ABB Power System Communications

Power Line Carrier ETL Family Training Program

Instructions to be followed

In the next slide shown the ETL setup has modules with information icons or . To see information about that particular module click the ETLonBLOCK DIAGRAM AND icon present the module When the information reachesPROGRAMMING at the end there will be a back arrow icon . Click on the icon and you will be back again at the ETL set up. In case you want to skip over to next section; click on the forward icon .

ABB Power System Communications

ETL BLOCK DIGARM & Power Line Carrier ETL Family Training PROGRAMMING ETL 41 Single Channel Equipment 40 Watt with speech (4wire) + 1 data modem NSK5 and 2 teleprotection commands

Program

P3LB RF-Hybrid

E5LA/B Tx-Filter

Channel shelf basic equipm.

6R

6R

User interface NSD 50

ABB Power System Communications

4R

8R

Power shelf

10R

8R

Option

P4LG Carrier synth.

P4LC IF-converter

P4LB AF-converter

P4LA Pilot+Supervn 4R

P4LF Tx--RF-conv.

7R

P4LD Rx-converter

6R

O4LATelcontrol interf.

6R

O4LC 4-wirePAXintrf.

4R

G4AE Modem NSK5

G4AC Interface

9R

G4AA DSP-Modul

Channel 1

6R

Power ampl. 40 W

B5LA Power Supply 48 VDC

B4LA DC-converter

P7LB Channel shelf

P7LA Power shelf

Module layout, example

ETL BLOCK DIGARM & PROGRAMMING Function

Power Line Carrier ETL Family Training Program

Level/Level range

Remarks

-3.5 dBr standard -20 up to +10 dBr

adjustable in steps of 0.25 dB

-3.5 dBr standard -20 up to +10 dBr

adjustable in steps of 0.25 dB

0V -12.5 V

external contact closed external contact open

4-wire PAX interface O4LB 4-wire I/P 600 Ohm

4-wire O/P 600 Ohm

M-SIGNALLING "MARK" "SPACE" E-SIGNALLING "MARK" "SPACE"

opto-coupler on O4LB

SPEECH CONTROL"ON”

0V

"OFF"

-12.5 V

PAX BLOCKING "ON" "OFF"

ABB Power System Communications

"ON" "OFF"

external contact closed compandor off external contact open compandor on potentially-free contact on O4LB closed open

ETL BLOCK DIGARM & PROGRAMMING

Power Line Carrier ETL Family Training Program

O4LB 4 WIRE PAX INTERFACE FOR CONNECTING 4 WIRE SPEECH SIGNALS AND ASSOCIATED SIGNALLING (E, M, SPEECH CONTROL ETC)TO EXCHANGE. ALSO HAS OPTIONAL HANDSET FACILITY

TX SPEECH PATH: A6-C6---INPUT TRANSFORMER --- INPUT AMPLIFIER WITH ADJ.GAIN S1----HIGH PASS FILTEROF 300HZ-- (COMPRESSOR)---LIMITER---PROGRAMMABLE(1800-3600HZ) FILTER--C13 AF BUS RX SPEECH PATH: FROM AF BUS A20--PROGRAMMABLE (1800-3600HZ) FILTER--(EXPANDER)-OUTPUT AMPLIFIER WITH GAIN ADJ S3 O/P AMPLIFIER--A8-C8

HANDSET SIGNALS: IN THE TX PATH ENTRY BEFORE HIGH PASS FILTER; IN THE RX PATH BEFORE S3 THROUGH AMPLIFIER SLOW MUTE: BLOCKS RX WHEN SIGNAL QUALITY LOW RX SPEECH OFF- WHEN NSD 50 TRIPPING PRESENT SYNT- CLOCK REQD FOR PROGRAMMABLE FILTER

M SIGNAL (TX) PATH: A26-C26--OPTO-- BUFFER--FILTER-- C31 M WIRE E SIGNAL (RX) PATH: A31-- BUFFER--FILTER- OPTO--A30-C30. BUSY LED LITS FOR HIGH E/M SPEECH CONTROL : A24-C24-- OPTO TO MAKE COMPANDER ON /OFF FOR LOCAL/TRANSIT

ABB Power System Communications

ETL BLOCK DIGARM & PROGRAMMING

Power Line Carrier ETL Family Training Program

O4LB: 4 WIRE PAX INTERFACE PROGRAMMING: I/P (TX) LEVEL: SWITCH S1 (DEFAULT -3.5dBr) O/P (RX) LEVEL: SWITCH S3 (DEFAULT -3.5 dBr) LOW PASS FILTER: FROM 1800HZ TO 3400HZ THROUGH JUMPERS GH,GG,GE,GF,GD COMPANDER: CF PERMANENTLY OUT OFF CIRCUIT; CX EXTERNALLY CONTROLLED,CO PERMANENTLY IN CIRCUIT ( WHEN CONTACTS CLOSED BECOMES OUT OFF CIRCUIT”)

PILOT SWITCHING: NORMAL FREQUENCY TC (TX); RC (RX) INVERTED MARK SPACE TD (TX); RD (RX)

O4LC: 2/4 WIRE PAX INTERFACE

ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL BLOCK DIGARM & PROGRAMMING 2/4-wire PAX interface O4LC 2-wire I/P 600 Ohm

0 dBr standard -16 to +6 dBr adjustable in steps of 0.25 dB

2-wire O/P 600 Ohm

-7 dBr standard -16 to +6 dBr adjustable in steps of 0.25 dB

4-wire I/P 600 Ohm

-3.5 dBr standard -20 to +10 dBr adjustable in steps of 0.25 dB

4-wire O/P 600 Ohm

-3.5 dBr standard -20 to +10 dBr adjustable in steps of 0.25 dB

M-SIGNALLING

"MARK" "SPACE"

0V -12.5 V

E-SIGNALLING "MARK" "SPACE"

external contact closed external contact open opto-coupler on O4LC "OFF"

"ON"

hybrid in hybrid out

HYBRID

"ON" "OFF"

0V -12.5 V

external contact closed, external contact open

SPEECH CONTROL

"ON"

0V

"OFF"

-12.5 V

external contact closed, 4-wire level compandor off external contact open, 2-wire level compandor on

PAX BLOCKING "ON" "OFF"

potentially-free contact on O4LC closed open

ABB Power System Communications

ETL BLOCK DIGARM & PROGRAMMING

Power Line Carrier ETL Family Training Program

O4LC: 2/4 WIRE PAX INTERFACE DETAILS & PROGRAMMING FOR CONNECTING 4 WIRE SPEECH SIGNALS AND ASSOCIATED SIGNALLING (E, M, SPEECH CONTROL ETC)TO EXCHANGE. ALSO HAS OPTIONAL HANDSET FACILITY

O4LC IS SIMILAR TO O4LB EXCEPT THAT IT HAS ADDITIONAL SWITCHABLE HYBRID WITH ADDITIONAL GAIN ADJUSTMENT S2 &S4 FOR 2WIRE TRANS /RECEIVE ALIGNMENT. 2 WIRE SIGNALS COMING OVER A2-C2 ARE CONNECTED TO HYBRID VIA INPUT TRANSFORMER. THE HYBRID IS CONNECTED TO TX RX PATHS BY MEANS OF SWITCHES OPERATED BY HYBRID CONTROL.

THE SPEECH CONTROL SELECTS 4 WIRE PATHS WHEN MADE HIGH; APART FROM OPTIONALLY SWITCHING THE COMPANDER. JUMPER PROGRAMMING: SIMILAR TO O4LB ADDITIONAL JUMPER PROGRAMMING: 2 OR 2/4 WIRE MODE TA; JUST 4 WIRE MODE TB

FOR O4LD

ABB Power System Communications

ETL BLOCK DIGARM & PROGRAMMING

Power Line Carrier ETL Family Training Program

O4LD REMOTE SUBSCRIBER INTERFACE FOR CONNECTING 2 WIRE COONECTIONS TO EXCHANGE/ SUBSCRIBER. ALSO HAS OPTIONAL HANDSET FACILITY

THE PRINT FACILITATES TWO MODES OF OPERATION : PAX TO SUBSCRIBER AND HOTLINE(POINT TO POINT IN THE FIRST MODE THE PAX SIDE O4LD DETECTS RING RHYTHM FROM THE PAX AND SEND IT TO REMOTE SUBSCRIBER THROUGH M SIGNAL WHICH ARRIVES AS E AT THE OTHER END. THE SUBSCRIBER SIDE O4LD AT THIS END DETECTS IT AND SIMILAR RING RHYTHM IS SUPERIMPOSED ON THE RINGING FREQUENCY AND FED TO THE SUBSCRIBER.; WHEN RECEIVER LIFTS THE PHONE IT DETECTS THE LOOP CONDITION AND PASS ON THE INFORMATION OVER M CHANNEL TO THE OTHER END. HERE THE PAX SIDE O4LD RECEIVES IT OVER E WIRE AND OFFERS LOOP CONDITION TO THE PAX. PAX STOPS APPLYING RINGING VOLTAGE AND THE SPEECH PATH IS MADE THROUGH. WHEN SUBSCRIBER DIALS THE DIALLING PULSES ARE CONVEYED TO THE PAX SIDE VIA THE M-E CHANNEL AND IT OFFERS CLOSED LOOPS TO PAX ACCORDINGLY. IN HOT LINE CONNECTION BOTH SIDES O4LD ARE SIMILAR. WHEN A SUBSCRIBER LIFTS ITS HANDSET, LOCAL O4LD DETECTS CLOSED LOOP AND THE OPPOSITE END OVER M WIRE THE CLOSED LOOP CONDITION IS INFORMED. AT OPPOSITE END RINGING VOLTAGE IS APPLIED TO THE SUBSCRIBER PHONE TILL THE HANDSET IS LIFTED. DURING THIS TIME THE CALLING PARTY GETS 400HZ RING BACK TONE. WHEN BOTH PHONES ARE OFFHOOK COMMUNICATION IS ESTABLISHED.

ABB Power System Communications

ETL BLOCK DIGARM & PROGRAMMING

Power Line Carrier ETL Family Training Program

O4LD REMOTE SUBSCRIBER INTERFACE THE PRINT HAS ALL THE REQUIRED OTHER UNITS LIKE FILTER; COMANDER ETC. THE HYBRID DIVIDES THE SIGNALS IN TO TX AND RX PATHS. PROGRAMMING MODE:

REMOTE SUBSCRIBER/ POINT TO POINT INTERFACE S1, S2, S3 PAX INTERFACE P1, P2,P3

SWITCH S7: FOR RING SEQUENCE/ RING FREQUENCY

2 WIRE INPUT (TX) LEVEL : S5 2 WIRE OUTPUT (RX) LEVEL: S6 LOW PASS FILTER: S8 COMPANDER: CF PERMANENTLY OUT; CO: PERMANENTLY IN

SIGNALLING: TC; RC NORMAL FREQUECY, TD, RD INVERTED MARK SPACE

ABB Power System Communications

Power Line Carrier ETL Family Training Program

ETL BLOCK DIGARM & PROGRAMMING

O4LA: TELECONTROL INTERFACE : I/P’s INPUT 1, 2, 3

Impedance 600 Ohm

Setting range Remarks -20 to +10 dBr

Steps of 0.25 dB All I/P's can be programmed to be disconnectable or non-disconnectable.

I/P 2 can be programmed as transit filter I/P or as broadband I/P O/P's OUTPUT 1, 2, 3

600 Ohm

-20 to +10 dBr

Steps of 0.25 dB All O/P's can be programmed as transit filter O/P or as broadband O/P

ABB Power System Communications

ETL BLOCK DIGARM & PROGRAMMING

Power Line Carrier ETL Family Training Program

O4LA: TELECONTROL INTERFACE : 3 DC ISOLATED INPUTS (TX) AS WELL AS 3 ISOLATED OUTPUTS (RX) THE INPUT TX SIGNALS’ LEVELS CAN BE ADJUSTED BY USING SWITCHES S1,S2,S3 (WITH STEPS OF 0.25dB)AND THEN CAN BE CONNECTED TO TX ND OR TX-D BUS. THE OUTPUT RX SIGNALS CAN BE TAKEN FROM THE BROADBAND RX SIGNAL OF 3.85K OR OPTIONAL 3.6KHZ FILTERED SIGNAL FROM P4LB. THE LEVELS CAN BE ADJUSTED WITH S4, S5, S6. OPTIONAL TRANSIT FILTER E1LA: THIS OPTIONAL FILTER CAN BE FITTED IN EITHER 2ND TXINPUT CHANNEL OR ANY COMBINATION OF RX-OUTPUT CHANNEL. THE START AND STOP FREQUENCIES CAN BE ADJUSTED WITHIN BAND OF 360HZ TO 3720HZ IN STEPS OF 60 HZ.

ABB Power System Communications

ETL BLOCK DIGARM & PROGRAMMING

Power Line Carrier ETL Family Training Program

O4LA: TELECONTROL INTERFACE :PROGRAMMING (JUMPER) DISCONNECTABLE BUS: I/P1-TB, I/P2-TD,I/P3-TF; NONDISCONNECTABLE BUS: I/P1-TA, I/P2-TC,I/P3-TE; I/P2 : DIRECT TG; THROUGH(OPTIONAL) E1LA:TH,TI (RI,RC,RF,RK OPEN) SIGNALS O/P1 O/P2 O/P3 E1LA SETTINGS:

O/P3 MUTING:

3.85K 3.6K TRANSIT E1LA (TH,TI OPEN) RA RB RC,RI RD RE RF,RI RG RH RK,RI HIGH PASS FRE. SWITCHES CD ON E1LA: 300+CD*60 LOW PASS FRE. SWITCHES AB ON E1LA: 360+AB*60 STANDARD 10 OPTIONS SELECTABLE BY SETTING D FROM 0 TO 9 WITH ABC =990 FAST(THROUGH NSD50):RL SLOW(WHEN RX QUALITY POOR): RM

ABB Power System Communications

ETL BLOCK DIGARM & PROGRAMMING

Power Line Carrier ETL Family Training Program

P4LB: AF CONVERTOR :TX SECTION ALL AF INPUTS ARE MIXED AND MODULTED WITH 16 KHZ. THE PRODUCT IS FILTERED (