Communication solutions for power utilities
A
UNIVERSAL POWER-LINE CARRIER SYSTEM
TYPE OPU-1
WHOLE BAND QAM MODEM
MBPU
Rev. 0 - July 2011
DIMAT
ntonio Machado,78-80
08840 Viladecans,
Barcelona-Spain
Tel.: +34 933 490 700
Fax: +34 933 492 258
Mail to: info@dimat.com
www.dimat.com
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Communication solutions for power utilities
SAFETY SYMBOLS
WARNING OR CAUTION:
!
!
This symbol denotes a hazard. Do not follow the indicated procedure,
operation or such like, it could mean a total or partial breakdown of the
equipment or even injury to the personnel handling it.
NOTE:
Information or important aspects to take into account in a procedure,
operation or such like.
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WHOLE BAND QAM MODEM MBPU - Rev. 0 (July 2011)
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Communication solutions for power utilities
TABLE OF CONTENTS
Page
1
INTRODUCTION 4
1.1 GENERAL 4
1.2 CONSTITUTION OF THE MODEM 4
1.3 TECHNICAL CHARACTERISTICS 5
2 OPERATING PRINCIPLE 7
2.1 MODULATION STANDARD AND SPEED 7
2.2 DATA TRANSMISSION IN ASYNCHRONOUS MODE 7
2.3 EQUALIZATION AND RECONDITIONING (RETRAIN) 8
2.4 MODEM RESET 8
3 INSTALLATION 9
3.1 MODULE ARRANGEMENT 9
3.2 TERMINAL BLOCK 9
4 COMMISSIONING 12
4.1 FRONT-PLATE ELEMENTS 12
4.1.1 Optical indicators 12
4.1.2 Button Pl1 14
4.2 INTERNAL ELEMENTS 14
4.2.1 MI1 microswitch 15
4.2.2 Switch 15
4.2.3 Jumpers 15
4.3 LEVELS 16
4.4 CONFIGURATION STORAGE 16
5 PROGRAMMING 17
5.1 AT COMMAND 17
5.1.1 Format of the AT commands 17
5.1.2 Group of AT commands 18
5.2 S REGISTERS 22
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WHOLE BAND QAM MODEM MBPU - Rev. 0 (July 2011)
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1 INTRODUCTION
1.1 GENERAL
The MBPU is a modem with a programmable modulation scheme, especially designed to
work in point to point Power-Line Carrier (PLC) links for the transmission of synchronous or
asynchronous data at a speed of up to 28800 bit/s in line.
The MBPU modem is capable of operating with frequency-shift keying (FSK) modulation
according to Recommendations V.23 and V.21 of ITU-T, as well as with multi-level
Communication solutions for power utilities
modulations (DPSK, QAM and TCM) according to Recommendations V.34, V.32bis, V.32,
V.22bis and V.22 of ITU-T.
The MBPU modem is made up of a single module, which can be totally incorporated in an
OPU-1 Universal Power-Line Carrier terminal, from which it receives the power supply. It
has two types of interface: V.24/V.28 of the ITU-T (with one clock for emission and another
for reception) and V.11 in accordance with standard ISO 4903 (a single clock).
It is possible to execute AT commands in order to modify the modem programming and
request the state of specific parameters, from a compatible Personal Computer (PC) that
has a communications emulator program, such as for example HyperTerminal. It is also
possible to configure certain parameters of the MBPU by means of the internal
microswitches and jumpers in the module.
1.2 CONSTITUTION OF THE MODEM
The MBPU modem is made up of a single-printed circuit board containing the circuitry of the
modem, all the adaptive circuits necessary for the connection of the transmission and
reception signals of the modem to the corresponding buses associated to the analog
channel of the OPU-1 terminal, the connection circuits associated to the elements on the
front plate, a programmable logic, the voltage stabilizers, as well as the jumpers and
microswitches to be configured by the user.
There is a button on the front plate for carrying out a terminal reset as well as for entering in
programming mode by means of AT commands.
UNIVERSAL POWER-LINE CARRIER SYSTEM TYPE OPU-1
WHOLE BAND QAM MODEM MBPU - Rev. 0 (July 2011)
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Communication solutions for power utilities
There are also optical indicators to display:
− The state of the logic signals of the interface.
− The data interface selected (V.24/V.28 or V.11).
− When a reset is being carried out in the module.
− When the module is in programming mode by means of AT commands.
1.3 TECHNICAL CHARACTERISTICS
Transmission mode Full-duplex point to point link
Transmission speed Between 300 and 28800 bit/s
Modulation
ITU-T standard Speed in line (bit/s) Modulation AT command
ccording to V.34, V32bis, V.32, V.22bis, V.22, V.23
and V.21 standards of the ITU-T, at different line
speeds (see Table 1).
specific standard may be configured or it can be
established that a standard is configured automatically
by means of negotiation during connection.
AUTO - - ATF0
V.34 28800 SM-TCM of 4 to 1024 points ATF16
V.34 26400
V.34 24000 SM-TCM of 4 to 1024 points ATF14
V.34 21600 SM-TCM of 4 to 1024 points ATF13
V.34 19200 SM-TCM of 4 to 1024 points ATF12
V.34 16800 SM-TCM of 4 to 1024 points ATF11
V.32bis 14400 TCM-128 ATF10
V.32bis 12000 TCM-64 ATF9
V.32 9600 TCM-32 ATF8
(1)
SM-TCM of 4 to 1024 points ATF15
V.32bis 7200 TCM-16 ATF7
V.32 4800 QAM-4 ATF6
V.22bis 2400 QAM-16 ATF5
V.22 1200 DPSK-4 ATF4
V.23 1200/75 or 75/1200 FSK ATF3
V.21 300 FSK ATF1
Table 1 Operating modes
(1)
Only for use in asynchronous mode.
UNIVERSAL POWER-LINE CARRIER SYSTEM TYPE OPU-1
WHOLE BAND QAM MODEM MBPU - Rev. 0 (July 2011)
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Communication solutions for power utilities
Data format Synchronous: bit to bit.
Asynchronous:
Direct mode: V.14 conversion. Character
length of 8, 9, 10 or 11 bits.
With buffer
Data interface
Standard V.24/V.28 of the ITU-T (RS-232) and V.11 according
to ISO 4903
Type of connector 25-pin SUB-D (J1 of ZQBT) for V.24/V.28 and
15-pin SUB-D (J2 of ZQBT) for V.11
Speed with the DTE Asynchronous: 28800, 26400, 24000, 21600,
19200, 16800, 14400, 12000, 9600, 7200, 4800,
2400, 1200 and 300 bit/s.
Synchronous: 28800, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, 2400, 1200 and
300 bit/s
Speed with the
programming PC
Asynchronous: 38400, 28800, 19200, 14400, 9600,
7200, 4800, 2400, 1200, 600, 300 and 75 bit/s
Optical indications - State of the logic signals of the interface
(TD, RD, RTS, CTS, DSR, DTR and DCD).
- Modem connected to the line (OH).
- Type of interface (V.24 or V.11).
- Hardware reset of module (AUX lights up in red) or
module in programming mode by means of AT
commands (AUX blinks in green)
Connections ZQBT terminal block
Dimensions Height: 262 mm; Width: 30 mm; Depth: 256 mm
Weight 350 g
UNIVERSAL POWER-LINE CARRIER SYSTEM TYPE OPU-1
WHOLE BAND QAM MODEM MBPU - Rev. 0 (July 2011)
(with handles)
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Communication solutions for power utilities
2 OPERATING PRINCIPLE
2.1 MODULATION STANDARD AND SPEED
The MBPU modem has 7 modulation standards: V.34, V.32bis, V.32, V.22bis, V.22, V.23
and V.21, at different line speeds.
It can be programmed by means of commands AT, in order to operate at a predetermined
speed and modulation standard.
Table 1 shows the possible standards, their transmission speeds associated, and the AT
Hayes commands that configure the modem in order for it to operate according to the said
standards and speeds.
The automatic modulation scheme detection mode, that is programmed by means of
command ATF0 or ATN1, must always operate with modulations that comply with the ITU-T
standards (except V.22 at 600 bit/s QAM).
2.2 DATA TRANSMISSION IN ASYNCHRONOUS MODE
There are two asynchronous operating modes: direct or with intermediate storage
(buffering). The modem has a memory storage area (buffer), both in transmission and
reception, so that it can transmit at its own speed without having to depend on that of the
data terminal equipment.
It is possible to disable the intermediate storage mode (buffering), functioning therefore in
direct mode, by means of command AT\N1 or AT&Q0. In direct mode, the speed selected in
the communications program must be the same as that of the line speed.
The character format used by the series interface is selected according to the result of the
automatic speed negotiation or autobauding or, in the opposite case, to the S23 register.
The asynchronous formats permitted are those that include 1 start bit, 7 or 8 data bits, even
parity, odd parity or none, and 1 or 2 stop bits.
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WHOLE BAND QAM MODEM MBPU - Rev. 0 (July 2011)
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Communication solutions for power utilities
2.3 EQUALIZATION AND RECONDITIONING (RETRAIN)
The modem has an automatic adaptive equalizer that operates according to standards
V.22bis and higher (V.32, V.32bis and V.34). This equalizer continually supervises line
conditions, adapting it to them in order to guarantee optimum reception. If the equalizer
detects a marked decrease in the line quality, the modem is capable of generating a retrain
request according to the standard that is active. It will also answer a request from the
remote modem if necessary. The terminal will attempt a retraining up to three times before
disconnecting from the line.
2.4 MODEM RESET
Two types of reset, hardware and software, can take place in the MBPU modem.
The hardware reset occurs in the modem when the Pl1 button on the front plate is pressed
for more than 2 seconds (long pressing) or when the activation of the Unavailable link
(2)
signal is received, by means of the programming and control bus of the OPU-1 terminal.
The LED AUX on the front plate lights up in red to indicate this type of reset.
The software reset is produced internally in the modem when a training sequence should
begin or when the period of time determined by the S35 register has elapsed.
(2)
The conditions that activate the Unavailable link signal are specified in the OPU-1 terminal by means of programming,
Pilot loss, Low S/N ratio, Loss of synchronism and Boosting must at least be programmed.
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3 INSTALLATION
This chapter describes the installation of the MBPU modem in the 6 s.u. shelf of the
Universal Power-Line carrier terminal type OPU-1, together with the cabinet-mounted
terminal block associated to the modem module.
3.1 MODULE ARRANGEMENT
The MBPU module can be installed in the last five positions of the 6 s.u. shelf, provided the
said positions are not already occupied by other options. It must be kept in mind that the first
Communication solutions for power utilities
shelf position corresponds, seen from the front, to module POWER SUPPLY (FAPU).
The module must only be inserted when the power supply of the OPU-1 is not connected.
The MBPU module has two fixing screws, one at the top and one at the bottom of the
front plate.
To extract the module, turn the two fixing screws anti-clockwise as far as allowed. Then by
means of the handles pull the module out of the shelf.
Inserting the module in the shelf is achieved by carrying out the extraction process in
reverse. Once the module has been inserted, the fixing screws must then be turned
clockwise.
3.2 TERMINAL BLOCK
The terminal block associated to the MBPU module is called ZQBT.
The block is fastened to the OPU-1 cabinet-mounted terminal block by means of screws.
The connection between the block and the equipment is carried out by means of a cable.
The ZQBT terminal block is made up of:
− Four terminals that will allow a filter or an external equalizer to be inserted, provided
jumpers J10 and J11 are in position B.
UNIVERSAL POWER-LINE CARRIER SYSTEM TYPE OPU-1
WHOLE BAND QAM MODEM MBPU - Rev. 0 (July 2011)
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