DE10343723B4 - Apparatus for testing the installation of the junction boxes of an ISDN So bus system - Google Patents

Abstract

Apparatus for testing the installation of the junction boxes (102) of an ISDN S ₀ bus system comprising a test transmitter (103) connectable to the S ₀ bus for generating and transmitting signals (S _test ) for distinguishing the wires (1a, 1b, 2a, 2b) of a wire pair (1a / 1b; 2a / 2b) of the ISDN-S ₀ -Bussystems and one (in the junction box 102) insertable test receiver (104) for receiving and for assessment of the test transmitter (103) generated and transmitted signals (S _test ) and for outputting information about the correctness of the installation of the junction box (102), characterized in that the test transmitter (103) comprises a frequency generator (107), which between the two wires (1a, 1b, 2a, 2b) of a wire pair (1a / 1b, 2a / 2b) each have an asymmetrical duty cycle (T) between 1 to 5 and 1 to 15, preferably 1 to 9 and a Wesel frequency (f) between 10 kHz and 1 MHz, preferably 100 kHz, having alternating voltage signal (S _test ) generated and that the test receiver (104) has an evaluation device (117, 118), which is based on a polarity of the ...

Description

The invention relates to a device for testing the installation of the junction boxes of an ISDN S ₀ bus system.

In the wiring of buildings, an S ₀ bus system is often installed for connection to the ISDN telecommunications network (ISDN = Integrated Services Digital Network). On the S ₀ -Bus the junction boxes for the terminals are connected. The S ₀ -Bus is designed 4-wire, with one pair of wires 1a / 1b is provided for the transmission mode and another pair of wires 2a / 2b for the receiving operation in each case.

If there is no transmission of wanted signals, the wires are located 1a . 1b ; 2a . 2 B a pair of wires 1a / 1b ; 2a / 2 B at the same potential φ _1a = φ _1b = φ _{1a / 1b} ; φ _2a = φ _2b = φ _{2a / 2b} . Between two wire pairs 1a / 1b . 2a / 2 B There is a potential difference φ _{2a / 2b} - φ _{1a / 1b} , which is referred to as phantom _voltage U _phantom = φ _{2a / 2b} - φ _{1a / 1b} . This phantom voltage U _phantom serves as a supply voltage to connected ISDN devices. Useful signals are used as differential signals on the two wires 1a . 1b ; 2a . 2 B a respective pair of wires 1a / 1b ; 2a / 2 B on modulated.

The phantom voltage U _Phantom is in the normal operating state U _Phantom = 40 V. However, the ISDN public network is designed so that - for example, in case of failure of the power supply of the Network Terminator Basic Terminal (= Network Termination Basic Rate Access = NTBA) or the ISDN -speeder- a power supply only as emergency supply for a terminal is possible. The phantom voltage U _phantom now has reversed polarity: U _phantom = -40 V.

Devices for testing the installation of the junction boxes of an ISDN S ₀ bus system according to the prior art make use of the phenomenological voltage U _phantom for the detection of line breaks. Such a device for testing the installation of the junction boxes of an ISDN S ₀ -Bussystems is for example in the DE 297 08 161 U1 described.

The DE 196 09 510 A1 describes a line test device for an ISDN bus. This includes two boxes. In the first box, an astable multivibrator is connected to a capacitor. The second box contains six LEDs. The capacitor connected between the wires b1 and a2 of different wire pairs is cyclically opened and discharged again with the aid of the astable flip-flop. With rapid charging of the capacitor between the wires b1 and a2 different pairs of wires, a current from the power supply over half of the first transmission coil of the NT flows back through the capacitor via the second half of this transmission coil to the power supply. The induction pulse generated in the coil halves of the NT is used to flash the LEDs in the second box. Depending on the direction of the induction voltage pulse different LEDs come to light, so that a wire exchange can be detected.

The object of the invention is now to present a different type of device for testing the installation of the junction boxes of an ISDN S ₀ bus system, which can detect wire exchanges.

This object is achieved by a device for testing the installation of the junction boxes of an ISDN S ₀ bus system having the features of patent claim 1. Advantageous embodiments and further developments of the invention are specified in the subclaims.

The invention is based on the recognition that the phantom voltage U _{phantom is} not suitable to be able to recognize a wire interchange, as always both wires 1a . 1b ; 2a . 2 B a pair of wires 1a / 1b . 2a / 2 B same potential φ _1a = φ _1b = φ _{1a / 1b} ; φ _2a = φ _2b = φ _{2a / 2b} . Only with the help of these potentials φ _{1a / 1b} ; φ _{2a / 2b} superimposed signals a distinction is possible.

Furthermore, the invention is based on the finding that the ISDN useful signals that in normal operation on the wires 1a . 1b ; 2a . 2 B be modulated at the time of installation is not or not fully available. In addition, these signals can only be evaluated with comparatively high outlay.

Therefore, according to the invention, the apparatus for testing the installation of the junction box of an ISDN S comprises ₀ -Bussystems a connectable to the S ₀ bus test transmitter for generating signals for distinguishing the wires of a pair of the ISDN-S ₀ -Bussystems and one in the respective junction box plug-in test receiver for receiving and evaluating the signals generated by the test transmitter and for outputting information about the correctness of the installation of the junction box being tested.

In a particularly advantageous embodiment of the invention, it is provided that the test transmitter has a frequency generator, which between the two wires 1a . 1b ; 2a . 2 B a pair of wires 1a / 1b ; 2a / 2 B generates an alternating voltage signal and that the test receiver has a corresponding evaluation device, which based on the polarity of the received AC signal detects if the wires 1a . 1b ; 2a . 2 B of the respective pair of wires 1a / 1b ; 2a / 2 B are reversed.

The test transmitter is preferably connected directly to the entry point of the network operator (NTBA or ISDN power supply). This measure ensures that wire interchanges are detected in the entire ISDN S ₀ system.

A preferred embodiment The invention provides that the generated by the frequency generator AC signal has an asymmetrical duty cycle. By doing so leaves the polarity received by the test receiver AC signal clearly with the polarity of Correct the AC signal sent to the test transmitter. Any occurring phase shifts on the lines falsify the Detection result not.

When It has also turned out to be particularly advantageous to have a duty cycle between 1 to 5 and 1 to 15, preferably 1 to 9 and an alternating frequency the AC signal between 10 kHz and 1 MHz, preferably 100 kHz to choose.

In a particular embodiment of the embodiments specified above, the invention provides that the evaluation device identifies a filter device which decouples the received alternating voltage signal. In this way, the modulated AC signal is separated from the phantom voltage U _phantom in the test receiver. It has been found to be particularly advantageous to use a transformer as a transformer, in particular a conventional ISDN transmitter.

According to the invention is further provided that the test receiver an output device which, depending on the received AC voltage signal emits an acoustic, optical or haptic signal.

Preferably, the output device comprises two oppositely poled light emitting diodes or a duo LED, each between the two wires 1a . 1b ; 2a . 2 B a pair of wires 1a / 1b ; 2a / 2 B are arranged and which light up depending on the polarity of the received alternating voltage signal with different color. This embodiment comes with a small number of components. The above-mentioned asymmetrical duty cycle is sufficient to indicate the polarity change of the AC signal at the test receiver.

In a further embodiment of the invention, it is provided that the test transmitter has a power supply device which is fed by the phantom voltage U _{phantom of} the ISDN S ₀ -Bussystems. Thus, an independent of the electricity supplier's electricity supply operation of the test transmitter (and the test receiver) is possible. A test of the installation of the junction boxes of the ISDN S ₀ bus system is thus at any time and independently of the electricity grid of the energy supplier feasible.

In Another embodiment of the invention is provided that the test transmitter has a driver which has the required output power and generates the required output voltage for the frequency generator. The AC voltage generation in the test transmitter is by this measure of the transmitter power independent. hereby is achieved that as frequency generators commercially available building blocks can be used which adapted by means of the driver to the necessary power output become.

In a particularly advantageous embodiment of the invention, it is provided that the test transmitter has an operating state display device which indicates whether the ISDN S ₀ bus system is in normal operation or in emergency operation. Errors in the mains voltage supply of the NTBA or the ISDN power supply can thus be found.

In a simple manner, the operating state display _device can be realized by displaying the polarity of the phantom voltage U _phantom . In particular, the display of the phantom _voltage U _phantom by two oppositely poled light-emitting diodes or a duo-LED can be done, wel che between the two wire pairs 1a / 1b ; 2a / 2 B are arranged and which shine depending on the polarity of the phantom _voltage U _phantom with different color.

In a further embodiment of the invention, it is provided that the test receiver has a further evaluation device which, based on an evaluation of the phantom _voltage U _phantom on the wires 1a . 1b ; 2a . 2 B detects a wire break. For this purpose, the further evaluation device, the wires 1a . 1b . 2a . 2 B the ISDN S ₀ -Bussystem bridging circuits having a common node, each vein 1a . 1b ; 2a . 2 B is connected via two oppositely poled light emitting diodes or one duo light emitting diode with the common node.

In the following, the invention will be described with reference to an embodiment shown in the invention explained in detail. Show it:

1 An ISDN S ₀ bus system starting from a network terminator base connection (NTBA).

2 The ISDN S ₀ bus system according to 1 to which a device according to the invention for testing the installation of the junction boxes of an ISDN S ₀ bus system is connected.

3 A connection possibility in the 2 illustrated test transmitter according to the invention.

4 That from the test transmitter after 3 generated and delivered to the S ₀ -Bus output signal.

5 Block diagram of a test transmitter according to the invention.

6 The operating state indicator of the test transmitter after the 5 ,

7 The power supply of the test transmitter after the 5 ,

8th The frequency generator of the test transmitter according to the 5 ,

9 The driver of the test transmitter according to the 5 ,

10 A block diagram of a test receiver according to the invention.

11 The evaluation and output device of the test receiver after the 10 for the phantom power

12 The evaluation and output device of the test receiver after the 10 for the detection and display of a wire interchange of the transmitter core pair or of the pair of reception cores.

The 1 shows the simplest form of installing the junction boxes in an ISDN S ₀ bus system. Core element is the Network Terminator Basic Connection (Network Termination Basic Rate Access = NTBA) 111 , This NTBA 111 is supplied with electrical energy via the 230 volt network SV. On the input side, the NTBA points 111 the so-called U _K0 interface, which is connected to the exchange of the ISDN Amtnetzes. On the output side form the contacts 3 . 4 . 5 and 6 the 4-wire (wires 1a . 1b . 2a . 2 B ) S ₀ bus. The pair of wires 1a / 1b is for the transmission of the NTBA 111 intended. The pair of wires 2a / 2 B is for the receiving operation of the NTBA 111 intended.

The S ₀ bus in this example is a single Integrated Services Digital Network (ISDN) outlet 102 guided. Both veins 1a . 1b ; 2a . 2 B a respective pair of wires 1a / 1b . 2a / 2 B are over 100 ohm terminators R1, R2 completed.

As already explained at the beginning, the wires are located 1a . 1b . 2a . 2 B a pair of wires 1a / 1b ; 2a / 2 B both in normal operation of the NTBA 111 as well as in emergency operation of the NTBA 111 at different potentials φ _{1a / 1b} , φ _{1a / 2b} . In normal operation, the potential difference, the phantom voltage U _phantom = φ _{2a / 2b} - φ _{1a / 1b} = +40 volts, in emergency operation, this phantom voltage U _phantom = φ _{2a / 2b} - φ _{1a / 1b} = -40 volts.

As is clear from the 2 results, becomes the test transmitter 103 by means of a RJ45 plug to the NTBA 111 connected. The connection is made parallel to the existing installation.

Are all connections on the NTBA 111 occupied, becomes the test transmitter 103 looped. The test transmitter 103 remains during the entire test of the installation of junction boxes 102 connected.

The NT 111 must be connected to the power supply SV, because through him the supply of the test transmitter 103 and the test recipient 104 he follows. The NT 111 may, but need not, be connected to the 2-wire bus system U _K0 to the digital exchange of the ISDN official network.

For safety reasons, ISDN devices should not be connected to the S ₀ bus during the test.

The test receiver 104 is successively as shown in the 2 into the junction boxes to be tested 102 plugged in. It is not necessary to remove the 100 ohm terminators R1, R2. Only in the event of an error can it be necessary to locate the fault to remove one of these terminating resistors R1, R2 or both terminating resistors R1, R2.

As stated in detail above, the device for testing includes the installation of the junction boxes 102 an ISDN S ₀ bus system both a test transmitter 103 as well as a test receiver 104 , The test transmitter 103 has the task to generate a test signal S _test and into the two pairs of lines 1a / 1b . 2a / 2 B couple. It can do this for both wire pairs 1a / 1b . 2a / 2 B of the S ₀ bus, as in the 3 is shown, the same test signal S _test used who the. However, it is also possible for every single pair of wires 1a / 1b . 2a / 2 B to provide a separate test signal S _test .

As a test signal S _test , an AC signal is preferably coupled, which is in the 3 is symbolized by the separation capacitors C _1a , C _2a , C _1b , C _2b .

The alternating voltage signal S _Test used in the example is a square wave signal with unbalanced waveform. The AC signal S _Test has a frequency of 100 kHz and a duty cycle T = 1 to 9. For the no-load peak-to-peak voltage V _SS , a value of 7.5 volts was chosen.

The unbalanced waveform of the AC signal S _Test , here in the form of an asymmetrical duty cycle T, forms the basis for the detection and display of a wire interchange. Depending on the polarity of the AC signal S _test , the test receiver 104 recognize if the veins 1a . 1b ; 2a . 2 B a respective pair of wires 1a / 1b ; 2a / 2 B are reversed.

The 5 shows a block diagram of a test transmitter 103 , which is suitable for generating the above-described AC signal S _test . He has one with the S ₀ -Bus via a line 109 connected power supply device 106 on, on which over appropriate lines 111 . 112 . 113 a frequency generator and one to this via a line 114 connected driver 108 which in turn via the line 115 connected to the S ₀ bus.

The power supply device 106 has the task to generate from the phantom voltage U _phantom of 40 volts a supply voltage V _SS from 7.5 to 8 volts. For space and cost reasons, no switching regulator is used in the present example, so that the power loss is converted into heat. This is a simple resistor diode network consisting of the resistors R5, R6, R7, R8, R9, R10, R11, R12 and the diodes D1, D2, D3, D4, D5, with a smoothing capacitor C1 according to the in 7 shown illustration.

As a frequency generator, a conventional NE555 module is used in the embodiment, which in the 8th is identified by the reference symbol IC1.

Of the 8th takes the wiring of the device NE555 (IC1) to generate a square wave signal S _test with a frequency f of about 100 kHz. Frequency determining are the resistors R13, R14, R15 and the capacitor C2.

With the resistors R14, R15 and the diode D7, a duty ratio T of about 1 to 9 is set. The remaining Components C3, C4 correspond to the standard circuit.

The driver 108 will - as in the 9 is shown - realized with a conventional module HEF 4049. By the parallel connection of 3 driver elements for one core 1a . 1b . 2a . 2 B the necessary driver performance is achieved.

In addition to the transmitter for generating and sending test signals S _test , the test transmitter 103 in the present embodiment additionally an operating state display device 105 on, which indicates whether the ISDN S ₀ bus system is in normal operation or in emergency mode. In what way this operating state indicator 105 is realized in terms of circuitry, results from the 6 , The operating status indicator 105 consists in the present example of two oppositely poled LEDs LED 1, LED 2, which between the two wire pairs 1a / 1b ; 2a / 2 B are arranged and connect them together. In addition, two series resistors R3, R4 are connected upstream of the oppositely poled LEDs LED 1, LED 2 for current limiting. Depending on the polarity of the phantom _voltage U _phantom , either the light-emitting diode LED 1 or the light-emitting diode LED 2 lights up.

In normal operation, the two wires 2a . 2 B of the receiving pair at a more positive potential than the two wires 1a . 1b of the Sendeadernpaares 1a / 1b , In emergency mode, the polarity is reversed.

in the Normal operation lights consequently the LED 1 with green color, In emergency mode, the LED 2 lights up with red color.

The test receiver 104 is in the present embodiment as in the 10 constructed in the block diagram. Thus, the test receiver points 104 two evaluation devices 119 . 118 with associated output devices 120 . 121 for the detection and display of a permutation of the wires 1a . 1b of the Sendeadernpaares 1a . 1b or a permutation of the veins 2a . 2 B of the receiving pair of wires 2a . 2 B on. Circuit technology is the evaluation and output device 117 . 118 . 120 . 121 for the detection and display of a permutation of a pair of transmit or receive wires 1a / 1b ; 2a / 2 B like in the 12 is shown executed. Accordingly, with the aid of a capacitor C5 and a transformer L1, the AC voltage component of the respective pair of wires 1a / 1b and 2a / 2 B decoupled. The actual evaluation and output device 117 . 120 ; 118 . 121 consists of a duo LED DuoLED 5, each one between the two wires 1a . 1b ; 2a . 2 B a pair of wires 1a . 1b ; 2a . 2 B this is arranged bridging and which lights depending on the polarity of the received AC signal S _test with different color. Parallel to this duo LED DuoLED 5, a capacitor C6 is connected, which attenuates disturbing signal components such as overshoot or crosstalk from other lines, etc. The duo LED DuoLED 5 lights green depending on the polarity of the received AC signal S _Test (no permutation of the respective wires 1a and 1b or 2a and 2 B ) or red (permutation of the respective wires 1a and 1b or 2a and 2 B ).

In the present Ausführungsbeispeil is additionally an evaluation and output device 116 . 119 provided, which serves for the detection and display of line interruption. The circuitry execution takes you from the 11 , Accordingly, 4 duo LEDs DuoLED 1, DuoLED 2, DuoLED 3, DuoLED 4 are provided, which in each case via a series resistor R16, R17, R18, R19 to one core 1a . 1b . 2a . 2 B of the S ₀ bus are connected. All four duo LEDs DuoLED 1, DuoLED 2, DuoLED 3, DuoLED 4 are routed to a common node Kn1. All four LEDs DuoLED 1, DuoLED 2, DuoLED 3, DuoLED 4 result in a virtual voltage point, which is due to the symmetrical structure at 20 V.

Becomes a vein 1a . 1b . 2a . 2 B of the S ₀ bus due to a line interruption de-energized, the associated LED extinguishes DuoLED 1, DuoLED 2, DuoLED 3, DuoLED 4. Due to the design as duo LEDs DuoLED 1, DuoLED 2, DuoLED 3, DuoLED 4 can also reverse polarity between the veins 1a . 1b . 2a . 2 B different wire pairs 1a / 1b ; 2a / 2 B are displayed.

1

Contact

2

Contact

3

Contact

4

Contact

5

Contact

6

Contact

7

Contact

8th

Contact

1a

Vein

1b

Vein

2a

Vein

2 B

Vein

1a / 1b

pair for broadcasters

2a / 2b

pair for recipients

101

NT = Network Terminator Base Port = Network Termination Basic Rate Access

102

ISDN connection box = Integrated Services Digital Network - Junction Box

103

Test transmitter

104

Test receivers

105

Operating status display

106

Power supply

107

frequency generator

108

driver

109

management

110

management

111

management

112

management

113

management

114

management

115

management

116

evaluation for phantom power

117

evaluation for wire exchange of the Sendeadernpaares

118

evaluation for wire exchange of the receiving pair of wires

119

output device

120

output device

121

output device

C1

capacitor

C2

capacitor

C3

capacitor

C4

capacitor

C5

capacitor

C6

capacitor

C _1a

capacitor

C _1b

capacitor

C _2a

capacitor

C _2b

capacitor

D1

diode

D2

diode

D3

diode

D4

diode

D5

diode

D6

diode

D7

diode

DuoLED 1

Duo-LED

DuoLED 2

Duo-LED

DuoLED 3

Duo-LED

DuoLED 4

Duo-LED

DuoLED 5

Duo-LED

f

frequency d. Output signal of the test transmitter

GND

ground connection

IC1

frequency generator NE555

IC2

driver module HEF4049

CH1

junction

L1

ISDN exchanger

R1

terminator

R2

terminator

R3

dropping resistor

R4

dropping resistor

R5

dropping resistor

R6

dropping resistor

R7

dropping resistor

R8

dropping resistor

R9

dropping resistor

R10

dropping resistor

R11

dropping resistor

R12

dropping resistor

R13

resistance

R14

resistance

R15

resistance

R16

dropping resistor

R17

dropping resistor

R18

dropping resistor

R19

dropping resistor

S ₀

S ₀ bus / S ₀ interface = internationally standardized 4-wire bus system for ISDN devices

SV

power supply

t

Time

T

duty cycle

U _K0

2-core Bus system between the digital exchange and the NTBA

V _DD

tension

V _CC

tension

V _SS

tension

φ _{1a / 1b}

El. Potential of the transmitter wire pair

φ _{2a / 2b}

El. Potential of the receiving pair of wires

Claims (14)

Device for testing the installation of junction boxes ( 102 ) of an ISDN S ₀ bus system comprising a test transmitter connectable to the S ₀ bus ( 103 ) for generating and sending signals (S _test ) for distinguishing the wires ( 1a . 1b . 2a . 2 B ) of a pair of wires ( 1a / 1b ; 2a / 2 B ) of the ISDN S ₀ bus system and one in the junction box ( 102 ) plug-in test receiver ( 104 ) for the reception and evaluation of the test transmitter ( 103 ) generated and sent signals (S _test ) and to output information about the correctness of the installation of the junction box ( 102 ), characterized in that the test transmitter ( 103 ) a frequency generator ( 107 ), which between the two wires ( 1a . 1b ; 2a . 2 B ) of a pair of wires ( 1a / 1b ; 2a / 2 B ) an asymmetrical duty cycle (T) between 1 to 5 and 1 to 15, preferably 1 to 9 and a Wesel frequency (f) between 10 kHz and 1 MHz, preferably 100 KHz, exhibiting alternating voltage signal (S _test ) generated and that the test Receiver ( 104 ) an evaluation device ( 117 . 118 ), which detects on the basis of a polarity of the received AC voltage signal (S _test ), whether the wires ( 1a / 1b ; 2a / 2 B ) of the respective pair of wires ( 1a / 1b ; 2a / 2 B ) are reversed. Apparatus according to claim 1, characterized in that the evaluation device ( 117 . 118 ) has a filter device (L1), which decouples the received AC signal (S _test ). Device according to claim 2, characterized in that the filter device has a transformer (L1). Apparatus according to claim 2 or 3; characterized in that the test receiver ( 104 ) an output device ( 120 . 121 ), which outputs an acoustic, optical or haptic signal as a function of the polarity of the received AC voltage signal (S _test ). Apparatus according to claim 4, characterized in that the output device ( 120 . 121 ) comprises two oppositely poled light emitting diodes or a duo LED (DuoLED 5), which in each case between the two wires ( 1a . 1b ; 2a . 2 B ) of a pair of wires ( 1a / 1b . 2a / 2 B ) and which light up in different colors depending on the polarity of the received AC signal (S _test ). Device according to one of the preceding claims, characterized in that the test transmitter ( 103 ) a power supply device ( 106 ) which is fed by the phantom voltage (U _phantom ) of the ISDN S ₀ bus system. Device according to one of claims 1 to 6; characterized in that the test transmitter ( 103 ) a driver ( 108 ) having the required output voltage for the frequency generator ( 107 ) generated. Device according to one of the preceding claims, characterized in that the test transmitter ( 103 ) an operating state display device ( 105 ), which indicates whether the ISDN S ₀ bus system is in normal operation or in emergency operation. Apparatus according to claim 8, characterized in that the operating state display device ( 105 ) indicates the polarity of the phantom voltage (U _phantom ). Apparatus according to claim 9, characterized in that the operating state display device ( 105 ) comprises two oppositely poled light emitting diodes (LED 1, LED 2) or a duo LED, which between the two wire pairs ( 1a / 1b ; 2a / 2 B ) are arranged and which shine in different colors depending on the polarity of the phantom (U _phantom ). Device according to one of the preceding claims; characterized in that the Test receiver ( 104 ) another evaluation device ( 116 ), which by means of an evaluation of the phantom voltage (U _phantom ) on the wires ( 1a . 1b ; 2a . 2 B ) detects a wire break. Apparatus according to claim 11, characterized in that the further evaluation device ( 116 ) the wires ( 1a . 1b ; 2a . 2 B ) of the ISDN S ₀ bus system bridging circuits, wherein the circuits have a common node point (Kn1) and each core ( 1a . 1b ; 2a . 2 B ) is connected to the common node (Kn1) via two oppositely poled light-emitting diodes or a duo LED (DuoLED 1, DuoLED 2, DuoLED 3, DuoLED 4). Test Transmitter ( 103 ) for a device for testing the installation of junction boxes ( 102 ) of an ISDN S ₀ bus system according to one of the preceding claims. Test receiver ( 104 ) for a device for testing installation of junction boxes ( 102 ) of an ISDN S ₀ bus system according to one of claims 1 to 12.