Transcript
RTU560 product line
Modem 23WT25 Data sheet
Characteristics A high-resistance staggering is possible with the 23WT25 modem on multi-drop lines. Duplex and half-duplex operation is possible without special additional provisions like butterfly connection according to channel assignment and selected two wire or four-wire line. It is designed for the transfer characteristics of local-cable-wires. Light emitting diodes indicate the most important operation states and disconnect test sockets on the front plate allow an easy testing and measuring of the VFT-channels as also of the data terminal equipment (DTE) interface signals. Within a RTU560 subrack the board occupies one slot. The modem can be delivered in two different rubrics for two different supply voltages. Within the RTU 560 subracks it supplies itself by the 24 V DC (R0002). The rubric R0002 (24 V DC) can also be used for 24 V supply voltage with voltages tolerance from ± 20 %. Therefore it can also be used outside of RTU 560. The rubric R0001 will be used if only 5 V DC are available.
Application The 23WT25 modem is designed for the operation on telecontrol lines together with the RTU560. However it can also be connected to other data terminal equipments because it operates at the interfaces like a universal FSK-modem in the voice-band range (300-3400 Hz) according to CCITT.
A digital signal processor (DSP) is responsible for the conversion of the binary information into the voice band and vice versa. Its high processing capacity allows beside others a high selective channel filtering (90 dB) and thereby an unrestricted channel assignment.
The 23WT25 modem allows the assignment of a two- or fourwire line with communication channels for 50 baud up to 2400 baud (24 channels 50 baud, 12 channels 100 baud, 6 channels 200 baud, 2 channels 600 baud, 1 channel 1200 baud). The modem 23WT25 is available in two versions (rubrics): – R0001: 5 V DC power supply – R0002: 24 V DC power supply RxD DCD
Figure 2: Communication line connection
SQL EQZ TxD RTS
Figure 1: Block diagram 23WT25
The channels can be assigned in the CCITT raster. Transmitter and receiver can be configured to different baud rates for transfer rates of up to 600 Bit/s. If all channels should be used in any combination and baud rate, the high channel selectivity is to configure. The normal selectivity can be used at separate assignment of transmit- and receive-channels (block configuration)
and at least one channel distance between the blocks. A lower transfer time and isochronous distortion is given at normal selectivity. The 23WT25 modem can monitor the receiving signal for isochronous distortion and indicate by the ”signal quality level (SQL)”-alarm a repeated (10x) limit exceeding (40% resp. 50%). The LED SQL indicates for at least four seconds, at greater interferences accordingly longer, the exceeding of the maximum distortion. The audio-frequency carrier is monitored and indicated respectively alarmed by the DCD signal. For multi-drop lines, a carrier drop-out can be signalized with a delay by the alarm relay. The delay time depends hereby on the baud rate. The alarm relay of the modem responses at carrier drop-out (DCD direct or delayed), at SQL alarm, or at supply voltage failure. To compensate line distortion on critical transmission links the 23WT25 modem offers the possibility of an adjustable pre-distortion. Depending on the quality condition of the transmission link this pre-distortion can be set in high-pass or low-pass between 0 and 10 dB. The two 23WT25 modems of a transmission link can be configured for test-transmitter and test-receiver to adjust the correct pre-distortion. The utilized result of the transmitted test pattern indicates the LED EQZ. The flash frequency of the LED EQZ is a degree for the achieved improvement. The 23WT25 modem allows to connect up to three transmission lines star-coupled as point-to-point link without repeater. The transmitter output circuit operates hereby as constant current source. All essential settings like channel, gain, line operation mode, line termination, transmission rate etc. are configured by jumpers. By the disconnect test sockets on the front plate the serial interface signals to the data terminal equipment (DTE) as also the VFT-lines can be measured or opened. Additional VF-signal transformers have to be used for requested higher isolation voltages.
2 | 1KGT 150 591 V005 1 - Modem 23WT25
Technical data
DCD monitoring
In addition to the RTU500 series general technical data, the following applies:
DCD alarm at duplex operation
Switches with carrier directly, operation mode configurable by jumper
DCD - LED
Switches with carrier directly
General Data Type of modulation
Frequency shift keying (FSK) with carrier switch-off for multi-drop network
Type of communication
Point-to-point or multi-drop network
Operation modes
Duplex or half-duplex via two-/ four-
Alarm relay Switching function
DCD alarm or SQL alarm and / or supply voltage failure
Alarm contact
60 V DC / 0.5 A / 30 W
wire links Channel assignment
According to CCITT raster
Serial interface to DTE Signal definition
V.24 / V.28
Signal lines
TxD D1 / 103 RxD C2 / 104
600 mA
24 V DC
140 mA
Mechanical layout Dimensions
160 mm x 100 mm, 3HE euro card format
CTS M2 / 106
4R (20 mm) front panel
Interface to transmission line
Housing type
Printed circuit board
Mounting
for mounting in RTU560 racks
Weight
185 g
600 Ω non earthed and symmetrical, or 5 kΩ at stagger operation
Transmission level at 600 Ω
5 V DC
RTS S2 / 105
DCD M5 / 109
Input- / Output impedance
Current consumption for power supplied via RTU560 backplane
0 … -22.5 dBm configurable by jumper, depending
Connection type RTU560 backplane connector
48 pole type F DIN 41612
on bit rate (CCITT) or number of used
Transmitter pre-distortion
channels
Environmental conditions
In high- / or low-pass 0 … 10 dB
Nominal operating temperature range:
Receiver level range
-6 … -58 dBm
Sensitivity
6 / 10 / 14 / 26 dB
Receiver filter characteristic
configurable between high (90 dB) and normal selectivity (for 50…600 baud)
Relative humidity
5 ... 95 %
EN 60068-2-30
(non condensing)
Ordering information 23WT25 R0001
1KGT012400R0001
5 V DC power supply
Signal quality level monitor Threshold
0°C... 70°C
EN 60068-2-1, -2-2, -2-14
>40% for 50…1200 bd >50% at 2400 bd
23WT25 R0002
1KGT012400R0002
24 V DC power supply
isochronous distortion SQL - LED
ON: > 10 errors with < 4 sec distance OFF: no errors for at least 4 sec.
DCD monitoring DCD alarm at half duplex operation
if the carrier is lost for minimum n seconds (depends on baud rate): 50 baud 16 sec 100 baud 8 sec 200 baud 4 sec 600 … 2400 bd 2 sec
Modem 23WT25 - 1KGT 150 591 V005 1 | 3
Data table Data format
serial, binary, asynchronous
Traffic mode
Point to Poit, multidrop
Modulation type
Frequency shift keying (FSK) with carrierswitch-off for multidrop networks
CCITT channel
R.35
R.37
R.38A
600 Bd
V.23
2400 Bit/s
Bit rate nominal
50
100
200
600
1200
2400
Minimum channel distance
120
240
480
1440
lowest
420
480
600
1320
1700
2000
Hz
highest
3180
3120
3000
2760
1700
2000
Hz
Frequency deviation
± 30
± 60
± 120
± 210
± 400
± 400
Hz
Number of channels according to CCITT
24
12
6
2
1
1
Transmitter level according to CCITT
-22,5
-19,5
-16,5
-12
-8,7
-6
Transmitter level depending on used channels
1: -6 / 2: -9 / 3: -12 / 4: -12 / 5: -13,8 / 6: -13,8 / 7…9: -15,6 /
[used channels: level / used channels: level]
10…13: -17,2 / 14…18: -18,6 / 19…24: -19,8
Receiver sensity (RS)
6 / 10 / 14 / 26
Mid-frequency
Minimum receiving level at 14 dB RS channel transfer time
Isochronous distortion
Channel
high selectivity
delay time RTS = ON to DCD = ON
Channel
normal selectivity
high selectivity
delay time RTS = OFF to DCD = OFF
normal selectivity
4 | 1KGT 150 591 V005 1 - Modem 23WT25
Dimension
Bit/s Hz
dBm dBm
dB
high selectivity
-50
-48
-46
-51
-55
-46
dBm
norm. selectivity
-53
-53
-52
-51
-55
-46
dBm
high selectivity
43
26
15
6,7
3,5
3,1
msec
norm. selectivity
36
19
11
6
3,5
3,1
msec
high selectivity
1-3
4-8
8-13
5-7
7-11
18-24
%
norm. selectivity
0-2
0-2
0-2
5-6
7-11
18-24
%
minimum
58
36
21
9
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msec
maximum
85
50
29
14
minimum
46
24
14
7
6
6
msec
maximum
65
35
19
10
9
7,5
msec
minimum
50
28
16
6
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msec
maximum
74
46
27
12
minimum
40
20
12
6
3
3
msec
maximum
54
30
16
8
7
7
msec
msec
msec
ABB AG Power Systems Division P.O. Box 10 03 51 68128 Mannheim, Germany
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Modem 23WT25 - 1KGT 150 591 V005 1 | 5
