CN2492014Y - Hand-held ISDN user's network tester - Google Patents

Abstract

The utility model relates to a hand-held integrated service digital network user network tester, which comprises a meter case, a keyboard, a liquid crystal display screen, a main board, an interface board, an external connection power supply interface and a communication interface, wherein the main board is connected with the interface board through connectors which on the main board and the interface board, the external connection power supply interface and the communication interface are directly welded on the main board, and the liquid crystal display screen is welded on the main board and is located through a liquid crystal screen stent which is arranged on the main board. The key is that the utility model further comprises an integrated service digital network testing interface and an integrated service digital network testing control treatment circuit, wherein the integrated service digital network testing interface is directly welded on the interface board, the integrated service digital network testing control treatment circuit is arranged on the main board and comprises a microprocessor circuit unit, a power supply management unit, an error testing unit, a voice management unit, high level data link control controller unit, an integrated service digital network testing interface circuit unit and a programming unit. The tester has the advantages that the utility model not only is small and exquisite, the carrying is convenient, various integrated service digital network interfaces are capable of being tested, but also the operation is simple and flexible, and the utility model is convenient to use by the users.

Description

Hand-hold type isdn user network tester

Technical field

The present invention relates to a kind of network tester, refer to a kind of tester that is used for test synthesis service digital network (ISDN) user network especially.

Background of invention

In recent years, the ISDN technology develops rapidly, formulation along with ITU related protocol standard, various ISDN switching equipment and terminal equipment are flourish, because ISDN has compared many superior parts with traditional public telephone switching network (PSTN), especially be more suitable for the demand of surfing the Net, therefore, the telecommunication department of various places is widelyd popularize ISDN Integrated Service Digital Network business.But, the circuit of telecommunication department install and row's barrier process in lack and a kind ofly be applicable to that isdn line is safeguarded and the instrument of test, though the ISDN test instrumentation is also arranged now, but be generally desk-top tester, volume is bigger, and inconvenience is carried, and cost an arm and a leg troublesome poeration; In addition, some desk-top tester wherein has many functions and is not suitable for the Chinese user use because be external product.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of hand-hold type isdn user network tester, the similar mobile phone of the profile of this instrument, volume is little, it is portable to be easy to, its available external power supply or carry powered battery, it and user's interactive interface is a Chinese interface, more convenient user manipulates.But the basic service of this instrument test I SDN and supplementary service, line status, circuit transmission quality are also assessed automatically; The test interface of this instrument may be selected to be u interface, S interface, the PRI interface of BRI; In test environment, but both analog subscriber end equipment (TE) of this instrument, but also analog network side apparatus (LT, NT) can also carry out the agreement monitoring of BRI S interface and PRI interface, is more suitable for user's use.

Concrete technical scheme of the present utility model is achieved in that

A kind of hand-hold type Integrated Service Digital Network user network tester is made of hand-hold type meter case, the circuit board that places enclosure, external power interface and communication interface at least; The front upper of shell is provided with LCDs, and the bottom is provided with keyboard; The circuit board of enclosure mainly comprises mainboard, interface board, and mainboard and interface board are connected by the connector on the plate separately; External power interface, communication interface are directly welded on the mainboard; LCDs is welded on the mainboard and by the liquid crystal display screen support that is installed on the mainboard and locatees; Key is: also further comprise ISDN test interface and ISDN test control processing circuit; This ISDN test interface directly is welded on the interface board, this ISDN test control processing circuit is arranged on the mainboard, mainly is made of micro-processor interface circuit unit, Power Management Unit, error code testing unit, speech processing unit, High-Level Data Link Control (HDLC) controller unit, ISDN test interface circuit unit and programming unit; Programming unit links to each other with micro-processor interface circuit unit, error code testing unit, speech processing unit, hdlc controller unit and ISDN test interface circuit unit simultaneously, and the micro-processor interface circuit unit connects Power Management Unit.

Described ISDN test interface comprises u interface, S interface and the primary rate interface (PRI) in the isdn primary rate interface (BRI) of test I SDN business, line status and circuit transmission quality at least.Described communication interface is the RS-232 serial line interface.

Described ISDN test interface circuit unit comprises u interface circuit unit, S interface circuit unit, PRI interface circuit unit at least.This u interface circuit unit and S interface circuit unit are arranged on the interface board.The line signal processing section of this PRI interface circuit unit is arranged on the mainboard, and line interface partly is arranged on the interface board.

Described hdlc controller unit comprises a hdlc controller unit, or the hdlc controller unit that above purposes difference in functionality is identical.Described Power Management Unit mainly comprises extraneous power management part and battery charging and discharging administrative section.

Described ISDN test control processing circuit also further comprises liquid crystal display and Keyboard Control unit.

Description of drawings

Fig. 1 is the utility model schematic appearance;

Fig. 2 is a logic diagram of circuit of the present utility model;

Fig. 3 is one of motherboard circuit schematic diagram of the present utility model;

Fig. 4 is two of a motherboard circuit schematic diagram of the present utility model;

Fig. 5 is three of a motherboard circuit schematic diagram of the present utility model;

Fig. 6 is four of a motherboard circuit schematic diagram of the present utility model;

Fig. 7 is five of a motherboard circuit schematic diagram of the present utility model;

Fig. 8 is six of a motherboard circuit schematic diagram of the present utility model;

Fig. 9 is interface board circuit theory diagrams of the present utility model.

Embodiment

The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.

Fig. 1 is the outside drawing of the utility model hand-hold type ISDN tester, and this tester mainly comprises shell, internal circuit board and various interface, is provided with LCDs on the top of outer casing frontispiece, by the liquid crystal display circuit control of inside; Bottom at outer casing frontispiece is provided with keyboard, is controlled by the keyboard control circuit of inside.This tester is similar to the size shape of mobile phone, so carries lightly, conveniently, and by surperficial keyboard complete operation, convenient, flexible, simple and fast.

Internal circuit board of the present utility model comprises mainboard and interface board, as shown in Figure 2, ISDN test control processing circuit on the utility model mainboard mainly comprises the micro-processor interface circuit unit, Power Management Unit, the error code testing unit, the speech processing unit, High-Level Data Link Control (HDLC) controller unit, ISDN test interface circuit unit and programming unit, programming unit while and micro-processor interface circuit unit, the error code testing unit, the speech processing unit, the hdlc controller unit links to each other with ISDN test interface circuit unit, and the micro-processor interface circuit unit connects Power Management Unit.Wherein, ISDN test interface circuit unit comprises u interface circuit and the S interface circuit that connects middle u interface of isdn primary rate interface (BRI) and S interface, PRI interface circuit three parts that connect primary rate interface (PRI), the transmission quality that is used for test I SDN business, line status and circuit, u interface circuit and S interface circuit are positioned on the interface board.Two hdlc controllers are respectively applied for control and treatment Monitoring Data under different test modes.

Cooperate Fig. 3～circuit theory diagrams shown in Figure 8 below, and the logic diagram of circuit of Fig. 2 is to each circuit unit further instruction:

1) micro-processor interface circuit unit: be to constitute by central processing unit (CPU) U28, program storage U12, data storage U1, comprise in addition to CPU reset management reset circuit U2, provide the circuit OSC1 of clock oscillation and modulus (AD) change-over circuit U17 and the serial communication controlling circuit U 13 that analog quantity is gathered and quantized to CPU.As Fig. 5, Fig. 6, shown in Figure 7, U28 is Chip Microcomputer A M188ES, and U1 is a data storage 628512, and U2 is the chip MAX706ESA that resets, and U17 is AD conversion chip MAX1113, and U13 is serial communication control chip MAX202.

2) Power Management Unit: power management is divided into two parts, and a part is the management of external power supply, and another part is the management of charging and discharging of instrument battery.External power supply is generally direct current+10V, voltage is converted into+work of 5V output supply entire circuit by Switching Power Supply U26 and peripheral circuit thereof.Booster U23 and field effect transistor U25 jointly work the effect of boosting in the battery management circuit, the cell voltage about+3.6V is elevated to+5V supplies with instrumentation.When instrument is used powered battery, control power on/off by U16, when the 4th pin of U16 was the TTL high level, field effect transistor was in off state, and cell voltage disconnects; When it was the TTL low level, instrument power supply is connected and given to cell voltage.When instrument had external power supply to insert, CPU was set to the purpose that low level is reached for batteries charging by the 4th pin of field effect transistor U25.As shown in Figure 4, U26 is Switching Power Supply LM2576, and U23 is booster MAX770CSA, and U25 field effect transistor IRF7309, U16 are field effect transistor IRF7404.

3) error code testing unit: instrument uses error code testing chip U3 to finish the function of error code testing, this circuit can produce meet CCITT/ITU O.151, O.152, O.153, error code testing template O.161, and test error rate index by receiving own institute transmitted stream.As shown in Figure 5, U3 is error code testing chip DS2172.

4) speech processing unit: the U14 in this circuit unit is used for finishing the encoding and decoding and the filtering work of PCM signal, is the PCM signal of 64Kb/s or with the PCM signal decoding of 64Kb/s and be converted to simulated audio signal output with the simulated voice sample code of input.U15 and peripheral circuit thereof are amplifier circuit, forming the speech that can catch among the receiver BL1 that outputs to instrument after the analog signal amplification of U14 output.As shown in Figure 4, U14 is encoding and decoding and filtering chip MC145505DW, and U15 is audio frequency amplifier MC34119D.

5) hdlc controller unit: this instrument has two hdlc controller U4 and U9, and as shown in Figure 6, U4 is PEB2070, and U9 is PSB2186.When the use test instrument carries out u interface or S interface when surveying operation, control by HDLC1 (U4); When using this test instrumentation to carry out the monitoring of S interface,, and come data on another direction of control and treatment with HDLC2 (U9) by the data on direction of HDLC1 (U4) control and treatment.

6) ISDN test interface circuit unit: three interfaces that comprise control u interface, S interface and PRI interface are handled circuit unit, and wherein, u interface circuit unit and S interface circuit unit are arranged at test with on the interior interface board, referring to shown in Figure 9:

A) u interface circuit unit: the T2 in this circuit unit is the interface isolating transformer, and interface U91 plays the effect of u interface Echo Cancellation, and the data in the outside line are divided into the transmitting-receiving both direction; U93 is converted into CPU parallel bus data with the u interface line signal.Wherein, U91 is u interface Echo Cancellation chip PE36005, and U93 is u interface chip PEB2091.

B) S interface circuit unit: the T1 in this circuit unit is interface transformer PE65495, and U92 is S interface chip PEB2081, and it is converted into CPU parallel bus data with line signal, and dpdt relay J1 is opened and adhesive by CPU control.When the impedance of needs S interface circuit is set to " low-resistance ", the adhesive of CPU control relay, thus on the S interface, add 100 ohm of terminal resistances.

C) PRI interface circuit unit: the T4 on the interface board plays the jamproof effect of circuit, transformer T3 plays buffer action, enter into U5 and U6 on the mainboard behind circuit process T4 and the T3, when carrying out PRI, finish by U5 to survey, U5 finishes a monitoring function on the direction when carrying out the PRI monitoring, and the monitoring function on another direction is finished by U6.Wherein, U5, U6 are PRI interface chip BT8370-22, as shown in Figure 3.

7) liquid crystal display: the LCD MODULE that LCD1 produces for EPSON company in this unit, it is accepted CPU parallel bus data and shows output.Inverter U27 is used for controlling the backlight of liquid crystal, when its 5th pin is set to high level by CPU he will import+the 5V direct voltage is converted into 100V alternating voltage output, Driving Field formula backlight luminescence sheet is luminous.As shown in Figure 4, U27 is LCD backlight chip for driving ELD-1134.

8) Keyboard Control unit: 20～23 pin of four bit decoder U22 in this unit receive data, and as shown in Figure 5, decoding back output 1～11 and 13～17 pin one by one is set to low level, thereby reaches the purpose of each button of scanning.When scanning certain key of pressing, KEYBK0 or KEBYK1 pin will be low level, produce CPU and interrupt, and CPU can judge the user and supress which key by calculating the input data of this moment on the U22 input port.Wherein, U22 is four bit decoder 74HC154.

Mode of operation of the present utility model can be divided into u interface, S interface, PRI interface to surveying; S interface or the monitoring of PRI interface protocol, in conjunction with hardware configuration recited above and operation principle, the test philosophy of the utility model tester is such:

1) u interface, S interface, PRI interface are to surveying: when carrying out call testing, the PCM signal is sampled, is encoded in speech treatment circuit unit with user's simulated voice, exchange on the B channel of circuit through programmable logic chip then, HDLC1 (U4) handles the D channel data, after the input signal of circuit at first passes through the interface circuit cell processing, by programmable logic chip the data of B channel are delivered to the speech treatment circuit, the D channel data is sent into HDLC1 (U4); When carrying out the error code testing operation, process is with above-described identical, and different is to have replaced speech treatment circuit unit with the error code testing circuit unit.

2) S interface monitoring: the message that the communicating pair of receiving from the interface circuit of S interface transmits at the D channel, through the exchange of FPGA (Field Programmable Gate Array) the data of D channel on the direction are sent into HDLC1 (U4), the data on another direction are sent into HDLC2 (U9) thus reach the purpose that both sides D channel data is monitored.

3) PRI interface monitoring: U5 handles the message of the D channel on the direction, and U6 handles the message of D channel on another direction.

By above-mentioned analysis as can be seen, ISDN tester of the present utility model is not only small and exquisite, easy to carry, can test multiple isdn interface, and easy and simple to handle, flexible, provides more convenience for the user uses.

The above is preferred embodiment of the present utility model only, is not to be used to limit protection range of the present utility model.

Claims (9)

1, a kind of hand-hold type Integrated Service Digital Network user network tester is made of hand-hold type meter case, the circuit board that places enclosure, external power interface and communication interface at least; The front upper of shell is provided with LCDs, and the bottom is provided with keyboard; The circuit board of enclosure mainly comprises mainboard, interface board, and mainboard and interface board are connected by the connector on the plate separately; External power interface, communication interface are directly welded on the mainboard; LCDs is welded on the mainboard and by the liquid crystal display screen support that is installed on the mainboard and locatees; It is characterized in that: also further comprise ISDN test interface and ISDN test control processing circuit; This ISDN test interface directly is welded on the interface board, this ISDN test control processing circuit is arranged on the mainboard, mainly is made of micro-processor interface circuit unit, Power Management Unit, error code testing unit, speech processing unit, High-Level Data Link Control (HDLC) controller unit, ISDN test interface circuit unit and programming unit; Programming unit links to each other with micro-processor interface circuit unit, error code testing unit, speech processing unit, hdlc controller unit and ISDN test interface circuit unit simultaneously, and the micro-processor interface circuit unit connects Power Management Unit.

2, hand-hold type isdn user network tester according to claim 1 is characterized in that: described ISDN test interface comprises u interface, S interface and the primary rate interface (PRI) in the isdn primary rate interface (BRI) of test I SDN business, line status and circuit transmission quality at least.

3, hand-hold type isdn user network tester according to claim 1, it is characterized in that: described communication interface is the RS-232 serial line interface.

4, hand-hold type isdn user network tester according to claim 1 is characterized in that: described ISDN test interface circuit unit comprises u interface circuit unit, S interface circuit unit, PRI interface circuit unit at least.

5, hand-hold type isdn user network tester according to claim 4 is characterized in that: described u interface circuit unit and S interface circuit unit are arranged on the interface board.

6, hand-hold type isdn user network tester according to claim 4 is characterized in that: the line signal processing section of described PRI interface circuit unit is arranged on the mainboard, and line interface partly is arranged on the interface board.

7, hand-hold type isdn user network tester according to claim 1, it is characterized in that: described hdlc controller unit comprises a hdlc controller unit, or the hdlc controller unit that above purposes difference in functionality is identical.

8, hand-hold type isdn user network tester according to claim 1 is characterized in that: described Power Management Unit mainly comprises extraneous power management part and battery charging and discharging administrative section.

9, hand-hold type isdn user network tester according to claim 1 is characterized in that: described ISDN test control processing circuit also further comprises liquid crystal display and Keyboard Control unit.

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