BlueCom PLTS User manual

BCPT1010.SD.E2.doc, Rev.1.0
BlueCom Ltd.
PLTS
System Description
Party Line Telephone System

Doc.-No. Edition Date
BCPT1010.SD.E0 1.0 Master Edition 01.03.1999
Great care has been taken to ensure that the information contained in
this handbook is accurate and complete. Should any errors or omissions
be discovered or should any user wish to make a suggestion for
improving this handbook, he is invited to send the relevant details to:
BlueCom Ltd.
Giessenstrasse 15
8953 Dietikon
SWITZERLAND
Telephone [phone]
Telefax [phone]
E-mail [e-mail]
Internet http://www.bluecom.ch
© BlueCom Ltd.
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner.

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 3
Limited Warranty and Warranty Claims
BlueCom AG warrants each new product manufactured and sold by it to be free from defects
in material, workmanship and construction, except for batteries, fuses, or other material
normally consumed in operation which may be contained therein, for a period of one year
after shipment to the original purchaser (which period is referred to as the “warranty period”).
This warranty shall not apply if the product is used contrary to the instructions in its manual
or is otherwise subjected to misuse, abnormal operation, accident, or repairs or modifications
that have not been performed by BlueCom. BlueCom is not responsible for products which it
does not manufacture.
BlueCom’s obligation under this warranty is limited to in-factory servicing and repairing, at
BlueCom’s option, the product or the component thereof which is found to be defective. If in
BlueCom’s judgment the defective condition in a BlueCom product is for a cause listed above
for which BlueCom is not responsible, BlueCom will make the repairs or replacement of
components and charge its then current price, which buyer agrees to pay.
BlueCom shall not be responsible if the following procedure for warranty claims is not
followed. BlueCom shall be notified of the claim with full information as the claimed defect.
BlueCom products shall not be returned unless a return authorization number is issued by
BlueCom. BlueCom products must be returned with the description of the claim defect and
identification of the individual to be contacted if additional information is needed. BlueCom
products must be returned properly packed with transportation charge prepaid.
Except for the limited warranty stated above, BlueCom disclaims all warranties of any kind
with regard to BlueCom products or other materials provided by BlueCom, including without
limitation any implied warranty of merchantability or fitness for a particular purpose. BlueCom
shall have no liability or responsibility to the original customer or any other party with respect
to any liability, loss or damage caused directly or indirectly by any BlueCom product, material
or software sold or provided by BlueCom, BlueCom replacement parts or units, or service
provided by BlueCom, including but not limited to any interruption of service, excess charges
resulting from malfunctions of hardware or software, loss of business or anticipatory profits
resulting from the use or operation of the BlueCom product or software, whatsoever or
howsoever caused, and in no event shall BlueCom be liable for any direct, indirect, special or
consequential damages whether the claims are grounded in contract, tort (including
negligence), or strict liability.
Rights to Software
BlueCom retains ownership of the software supplied with this equipment and all copyrights
for the software. This software may be stored in the integrated circuits or in machine or
human readable form. BlueCom grants only a non-exclusive license to buyer to use the
software solely in connection with the normal and customary use of the equipment supplied
to buyer under this order. Buyer agrees not to read out the software from the integrated
circuits and disclose or make any use of such software other than the use allowed under this
license.

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 4
Contents Page
1 Introduction ........................................................................................................... 5
2 Mechanical Design ................................................................................................ 6
2.1 Interface J3KA ....................................................................................................... 6
2.2 J3KA Frontpanel .................................................................................................... 7
3 Functional Description ........................................................................................... 8
3.1 Block Diagram ....................................................................................................... 8
3.2 Typical Applications ............................................................................................... 9
3.2.1 Party Line Telephone System .................................................................... 9
3.2.2 Data Party Line System ............................................................................. 9
3.3 J3KA Testpoints .................................................................................................... 9
3.4 J3KA Potentiometers ............................................................................................10
3.5 J3KA Light Emitting Diode ....................................................................................10
4 J3KA Programming ............................................................................................. 11
4.1 Supply Voltage Range ..........................................................................................11
4.2 Gain Range ..........................................................................................................11
4.3 Factory Programming ...........................................................................................11
5 J3KA Technical data ........................................................................................... 12
5.1 Supply ..................................................................................................................12
5.2 Inputs ...................................................................................................................12
5.3 Outputs.................................................................................................................12
5.4 Amplifier ...............................................................................................................12
5.5 Ambient condition .................................................................................................13
5.6 Mechanical ...........................................................................................................13
6 Functional Test .................................................................................................... 13
7 Installation ........................................................................................................... 14
7.1 Unpacking and Inspection ....................................................................................14
7.2 Installation Overview ............................................................................................14
7.3 Installation Considerations....................................................................................14
7.4 DC-Power Requirements: .....................................................................................14
7.5 External Interconnect Information .........................................................................14
Appendix
PLTS Rack Factory Test Protocol BCPT1010.FP.E0
PLTS Rack Commissioning Test Protocol BCPT1010.CP.E0
Standard Drawing SETEL to PLTS BC980117

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 5
1 Introduction
A party line telephone system (PLTS), as described below, is a system with permanently
connected subscribers and featuring selective calling. It is especially suited for small private
telephone systems with relatively few subscribers and low traffic density. However, more and
more large electric utilities favour a seperation of their operational and administrative telephone
system and use a party line system for their operational needs.
The system described below makes use of standard in-band touch tone signalling tones
(DTMF) for selective calling. Furthermore, all connections throughout the system are on a 4-
wire basis up to the telephone microphones and receivers. When combined these features,
provide the following advantages.
 Echo free reception at good levels
 Fast signalling
 Easy expandability requiring no changes in the existing installation
 Solid state plug-in type modules provide for good maintainability
 Easy of establishing multy-party conference calls by simply dialling several numbers in
sequence
 Design flexibility. The system modularity allows adaptation to almost any customers
requirements.
 Low capital outlay
A party line telephone system consists of trunk path interconnecting several geographically
seperated stations and one or several local drops to subcriber telephone sets within a station.
The trunk path may consist of any combination of radio, pilot cable, microwave, fibre or power
line carrier links and may be designed in straight-line, star or ring configuration or any
combination thereof. The described system consist of a 19” rack R7AH where bridging
amplifiers type J3KA can be installed. As a 4W telephone set a SETEL can be connected to
the bridging amplifiers. The SETEL is a 4-wire telephone set, with a selective DTMF number
decoder.
The bridging amplifier module J3KA serves as a combining unit for four 4-wire audio circuits. It
is well suited for speech as well as voice data party line applications.
Signals applied to an input of the J3KA are passed to all remaining outputs except its own.
Example: A signal applied to input 1 is passed to outputs 2, 3 and 4 but not to output 1.
By means of twelve potentiometers the gain of any of these input to output paths can be
adjusted individually. Further, by means of jumpers, one of three coarse gain ranges can be
selected. The maximum voltage gains are as follows: low 6dB, medium 18dB, high 30dB.
Maximum output level is +16dBm when operated from a -48V supply or +10dBm when
operated from a -24V supply.
Inputs and outputs are 600 balanced, and are provided with interruptable testjacks.
Operation is from an unregulated DC supply of either -24 or -48V. The appropriate range can
be selected by means of a jumper. On the frontplate a green LED is provided for supply
indication.

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 6
2 Mechanical Design
The bridging amplifiers J3KA are housed in a 19” MES rack R7AH. Up to 8 bridging
amplifiers can be installed in a single rack.
2.1 Interface J3KA
The J3KA module is 3.5 ASA units high and 3 divisions wide. Its mechanical construction
conforms to the ABB MES standard. Each bridging amplifier has its connecting cable V9CT.
The circuitry is arranged on three printed circuit boards which are designated Na, Nb and Nc.
Na is the main board. It is fitted with an edge connector and contains the input testpoints, input
and output transformers and the supply circuits. Nb comprises the amplifiers with the
potentiometers for the gain adjustment. Nc contains the output testpoints.
FRONT VIEW
483 (19")
4-Way
Bridging Amplifier
INPUTS OUTPUTS
J3KA
1 1
2 2
3 3
4 4
SUPPLY
154
1 4 7 10 11 12 13 16 19 22 23 24Position:
(3,5 ASA)
REAR VIEW
1

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 7
2.2 J3KA Frontpanel
To facilitate commissioning and maintenance of a system, the frontpanel of the bridging
amplifier is equipped with the following:
 Testpoints on inputs and outputs
 Potentiometers for level adjustments
 A light emitting diode (LED) for supply indication
+
J3KA
INPUTS OUTPUTS
4-WAY
BRIDGING AMPLIFIER
+
1 1
+
+1
3 16
142
3
4
+
+
2 2
+
+
4
6 19
171
3
4
+
+
3 3
+
+
7
9 22
201
2
4
+
+
4 4
+
+10
12 25
231
2
3
SUPPLY

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 8
3 Functional Description
3.1 Block Diagram
L M H
1-2
1-3
1-4
14
16
1
3
5
7
27
25
Output 1
Input 1
L M H
2-1
2-3
2-4
17
19
4
6
11
13
31
29
Output 2
Input 2
L M H
3-1
3-2
3-4
20
22
7
9
15
17
35
33
Output 3
Input 3
L M H
4-1
4-2
4-3
23
25
10
12
19
21
41
39
Output 4
Input 4
24V 48V
DC-
Supply
9
37
-30V
-15V
0V
LED GN
J3KA
X..
V9CT
3
4
1
2
7
8
5
6
11
12
9
10
15
16
13
14
-24/48V
0V
17
18
19
20

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 9
3.2 Typical Applications
3.2.1 Party Line Telephone System
The diagram above shows a typical PLTS configuration. A PABX can be connected via its 4W
E&M interface to the PLTS system via a decoder. This decoder can be inserted in the rack
R7AH.
3.2.2 Data Party Line System
The J3KA are used to distribute the MODEM signal from the front end computer to the various
Remote Terminal Units (RTU) in the various substations. The same J3KA amplifiers are used
to collect the signals from the RTUs and transmit it to the front end computer in a system
control center.
3.3 J3KA Testpoints
Interruptible testpoints (U-links) are provided on all inputs and outputs which permit "bridged"
in-circuit measurements. The U-links can be removed which isolates the bridging amplifier
from the system and permits measurements on the wiring side or the bridging amplifier side.
To measure on the wiring side the testpoints to the left should be used. To measure on the
amplifier side the testpoints to the right should be used.
The testpoints are identified with a number and have the following functions:
 Testpoint 1 and 3 Input 1
 Testpoint 4 and 6 Input 2
 Testpoint 7 and 9 Input 3
 Testpoint 10 and 12 Input 4
J3KA J3KA J3KA
DTMF
Decoder
PABX
SETEL SETEL SETEL
SETEL SETEL
J3KA J3KA J3KAMODEM
Front End
Computer
MODEM
RTU
MODEM
RTU
MODEM
RTU
RTUMODEM

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 10
 Testpoint 14 and 16 Output 1
 Testpoint 17 and 19 Output 2
 Testpoint 20 and 22 Output 3
 Testpoint 23 and 25 Output 4
3.4 J3KA Potentiometers
Twelve multiturn potentiometers are provided which allow individual adjustment of each input
to output path.
They are arranged in four groups of three potentiometers each as follows:
 Group 1 controls signals from input 1.
Potentiometer 1 to output 2
Potentiometer 2 to output 3
Potentiometer 3 to output 4
 Group 2 controls signals from input 2.
Potentiometer 1 to output 1
Potentiometer 2 to output 3
Potentiometer 3 to output 4
 Group 3 controls signals from input 3.
Potentiometer 1 to output 1
Potentiometer 2 to output 2
Potentiometer 3 to output 4
 Group 4 controls signals from input 4.
Potentiometer 1 to output 1
Potentiometer 2 to output 2
Potentiometer 3 to output 3
In addition to the potentiometers, jumpers are provided for range selection (see 4.2 below).
3.5 J3KA Light Emitting Diode
A green LED on front panel (Light Emitting Diode) is provided which lits during normal
operation of the bridging amplifier. The LED turns on when sufficient supply voltage is present
for the voltage regulator to operate in its assigned range.

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 11
4 J3KA Programming
The following functions are programmable and should be checked before the amplifier is
utilized:
 Supply voltage range: -24 or -48 V (nominal)
 Gain range: Low, Medium or High
4.1 Supply Voltage Range
Two supply voltages can be used with the bridging amplifier: -24 V or -48 V. A jumper is
provided on the main PC board (Na).
Note: When the bridging amplifier is operated from a -24 V supply the maximum output level
is reduced to +10 dBm.
4.2 Gain Range
In addition to the adjustment by the potentiometers (described in 3.4), three coarse gain
ranges are provided for each output. The range selection can be made by means of jumpers
located on the Nb board as follows:
Desired gain Range selection Port 1 Port 2 Port 3 Port 4
 6 dB Low J1 L J2 L J3 L J4 L
+6...+18 dB Medium J1 M J2 M J3 M J4 M
+18...+30 dB High J1 H J2 H J3 H J4 H
The jumpers are located on the Nb board and can be changed without dismantling the unit.
They are arranged in a row as follows:
Port 1 Bottom jumper J1
Port 2 Third jumper from top J2
Port 3 Second jumper from top J3
Port 4 Top jumper J4
4.3 Factory Programming
If not specified otherwise the J3KA's will be factory adjusted as follows:
 Supply voltage -48 V
 Gain range: "Low"
 Gain: 0 dB

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 12
5 J3KA Technical data
5.1 Supply
Input voltage range
"-48V" -40..-60 V
"-24V" -20..-30 V
Maximum input voltage ripple 2 Vpp
Supply current  80 mA
5.2 Inputs
Impedance 600 , balanced
Return loss, 300...3400 Hz  14 dB
Maximum input level +16 dBm
5.3 Outputs
Impedance 600 , balanced
Return loss, 300...3400 Hz  14 dB
Maximum output level
48 V supply  +16 dBm
24 V supply  +10 dBm
5.4 Amplifier
Gain Continuously adjustable by means
of multiturn potentiometers
Ranges
low  6 dB
medium  18 dB
high  30 dB
Frequency response, 300...3400 Hz,
reference 800 Hz, 0 dB gain, +16 dBm out ± 1 dB
Harmonic distortion
400 Hz, 0 dB gain +16 dBm out  0.5 %
Output noise
300...3400 Hz, 0 dB gain  -70 dBm
Crosstalk, 300...3400 Hz, 0 dB gain, 0 dBm output
Input 1 to Output 1 -65 dB
Input 2 to Output 2 -65 dB
Input 3 to Output 3 -65 dB
Input 4 to Output 4 -65 dB

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 13
5.5 Ambient condition
Operating range: 0...55C
Transportation and storage: -20...55C
Humidity (non condensing): max. 90%
5.6 Mechanical
Type printed circuit board
3.5 ASA units high
3 divisions wide
Coding between contacts 33/35, 37/39, 41/43
6 Functional Test
See factory test protocol BCPT1010.FP.E0

System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0 BlueCom AG, 1.3.1999 14
7 Installation
7.1 Unpacking and Inspection
After Unpacking the unit, retain the carton and packing materials until the contents have
been inspected and checked against packing list. If there is a shortage or any evidence of
damage, do not attempt to use the equipment. Contact the carrier and file a shipment
damage claim. A full report of the damage should also be reported to BlueCom AG. The
following information should be included in the report:
Order number
Equipment Model and Serial Numbers
Shipping Agency
Date of Shipment
The BlueCom Service Department can be reached by phone at ++41 1 748 48 18 and by
Fax ++41 1 748 48 19. Upon receipt of this information BlueCom will arrange for repair or
replacement of the equipment.
7.2 Installation Overview
The following steps are needed to properly install the PLTS System:
Provide mechanical mounting for the unit. The Rack R7AH can be installed in a standard 19’’
cabinet by its front panel.
Provide the proper primary power for the bridging amplifiers J3KA.
Connect the SETEL phones to the V9CT cables.
Interconnect the unit with the communication system via the V9CT cable delivered with each
bridging amplifier J3KA.
7.3 Installation Considerations
Careful attention to the following installation suggestions should result in the best unit/system
performance.
The PLTS system must be installed in an environment, which provides both protection from
the weather and assurance of ambient temperatures between 0 and 55 degrees C. Since the
unit is neither splashproof nor corrosion resistant, it must be protected from exposure to salt
spray. When the unit is mounted in a cabinet with other heat-generating equipment, keep 1
HE free air space above and below the R7AH rack.
7.4 DC-Power Requirements:
The J3KA will be delivered from the factory with the supply jumper set to 48V DC. The J3KA
Amplifiers operate on a 48V DC or 24V DC power supply. First check right jumper setting.
Following voltage range has to be met:
Jumper on 48V DC: -40 ... –60V
Jumper on 24V DC: -20 ... –30V
If the input voltage exceeds the maximum voltage stated above it may result in damage of
the equipment. Power consumption of each J3KA is less than 5W.
7.5 External Interconnect Information
Please find on the standard drawing BC980117 a typical wiring configuration.