CN210444272U

CN210444272U - Active optical cable channel detection control card

Info

Publication number: CN210444272U
Application number: CN201921227513.0U
Authority: CN
Inventors: 綦正; 蒋军; 金兴汇; 周火焱; 黄江都
Original assignee: Wuhan Liansheng Photoelectric Technology Co ltd
Current assignee: Wuhan Liansheng Photoelectric Technology Co ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-05-01
Anticipated expiration: 2029-07-31

Abstract

The utility model relates to an active optical cable channel detection control card, wherein a first channel of an active optical cable is opened by a multi-channel analog switch; ADC samples the signal of the light receiving module and carries out analog/digital conversion; the CPU calculates the sampling signal; the DAC carries out digital-to-analog conversion on the signal value and then outputs the signal value; the multi-channel analog switch closes a first channel of the active optical cable, opens a second channel of the active optical cable, repeats the test process of the first channel of the active optical cable until all channels of the active optical cable are tested, and judges the signal value of each tested channel; and then opening all channels of the active optical cable, repeating the test process, and judging the sum of signals of all the channels. The signal intensity of each channel and the signal intensity of all channels of the optical cable are detected accurately and quickly by detecting the signal intensity of a single channel and the signal intensity of all channels of the optical cable, so that the detection accuracy and reliability are improved, and the quality of the optical cable can be controlled more accurately.

Description

Active optical cable channel detection control card

Technical Field

The utility model relates to an optical communication field, concretely relates to active optical cable passageway detects control board.

Background

In the existing common active optical cable assembly process, in order to improve the qualification rate, the optical fiber and the optical module need to be matched at a high speed, in the high-speed matching process, because a plurality of channels of the optical receiving module share one test point due to space limitation, the signal intensity of a single channel cannot be checked respectively, and therefore the qualification rate of the high-speed matched active optical cable is not ideal when the active optical cable is applied to a client.

SUMMERY OF THE UTILITY MODEL

The utility model provides an active optical cable channel detection control card aiming at the technical problems in the prior art, which is added in the active optical cable high-speed matching process, realizes the fast channel switching during the high-speed matching and synchronously detects the signal intensity of the corresponding channel of the optical receiving module; the detection control card controls the high-speed multi-channel analog switch through the CPU to realize channel switching with adjustable frequency, controls the ADC to acquire the signal intensity value of the current channel at the same time, and then sends the signal intensity value to the display device through different DAC channels, so that the signal intensity of each channel and all the channels of the optical cable can be accurately and rapidly detected, and the quality of the optical cable can be more accurately controlled.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

an active optical cable channel detection control card, the optical cable including an optical transmitting module and an optical receiving module, comprising:

the multi-path analog switch is used for switching the optical transmitting module channel;

ADC for sampling signal of light receiving module;

the CPU is used for calculating the sampled signals and controlling the multi-path analog switch;

a plurality of DACs for performing digital-to-analog conversion on the operated signals;

the dial switch is used for starting all channels;

the multi-channel analog switch, the ADC, the DACs and the dial switch are respectively connected with the CPU.

Preferably, the test circuit further comprises a signal source input port, the signal source input port is connected with the multi-path analog switch, and the signal source input port is used for receiving a test signal.

Preferably, the multi-channel analog switch further comprises a signal source output port, the signal source output port is connected with the multi-channel analog switch, and the signal source output port is used for outputting test signals of each channel.

Preferably, the test device further comprises a plurality of test signal output ends, the plurality of monitoring signal output ends are connected with the plurality of DACs in a one-to-one correspondence manner, and the monitoring signal output ends transmit corresponding electric signals output by the DACs to an external display device.

The utility model has the advantages that: the detection control card is added in the active optical cable high-speed matching process, the detection control card controls the high-speed multi-channel analog switch through the CPU to realize channel switching with adjustable frequency, controls the ADC to acquire the signal intensity value of the current channel at the same time, and then sends the signal intensity value to the display equipment through different output channels of the DAC. When high-speed matching is realized, the channels are quickly switched, the signal intensity of the light receiving module corresponding to a single channel is synchronously detected, and the signal intensity of each channel can be simultaneously displayed through the display equipment; after the signal intensity of all the single channels is tested, all the channels are opened simultaneously, the sum of the signal intensity of the whole optical cable is detected, and the signal intensity of the single channel and the signal intensity of all the channels are detected, so that the signal intensity of each channel and all the channels of the optical cable can be detected accurately and quickly, the accuracy and the reliability of detection are improved, and the quality of the optical cable can be controlled more accurately.

Drawings

FIG. 1 is a block diagram schematically illustrating the structure of the present invention;

FIG. 2 is a diagram of the CPU wiring A of the present invention;

FIG. 3 is a diagram of the CPU wiring of the present invention;

FIG. 4 is a circuit diagram of the CPU start-up circuit of the present invention;

FIG. 5 is a wiring diagram of a first multi-way analog switch of the present invention;

FIG. 6 is a wiring diagram of a second multi-way analog switch of the present invention;

FIG. 7 is a schematic diagram of the DAC circuit of the present invention;

FIG. 8 is a wiring diagram of the dial switch of the present invention;

fig. 9 is a wiring diagram of the signal source input port of the present invention;

fig. 10 is a wiring diagram of the signal source output port of the present invention;

FIG. 11 is a schematic diagram of a clock circuit according to the present invention;

fig. 12 is a schematic diagram of the reset circuit of the present invention.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

The present embodiment exemplifies testing of four channels of active optical cables.

Fig. 1 is a schematic block diagram of a structure of an active optical cable channel detection control card according to this embodiment, where the optical cable includes an optical transmission module and an optical reception module, and the detection control card includes a PCB and the following components disposed on the PCB:

the multi-channel analog switch is used for switching channels of the optical transmission module, and the embodiment adopts two Complementary Metal Oxide Semiconductor (CMOS) switches TMUX1511 which respectively control the opening and closing of two optical channels;

the ADC is used for sampling the signal of the light receiving module, the output end of the ADC is connected with the CPU, the input end of the ADC is connected with the test probe, and the test probe is connected with the light receiving module and is used for receiving the signal of a channel corresponding to the light receiving module;

the CPU is used for calculating the sampled signals and controlling the multi-channel analog switch, the CPU adopts a model STM32F103VET6, the CPU controls the opening and closing of each channel of the multi-channel analog switch, and averages the signal values of one sampling period and outputs the signal values;

the DAC comprises a plurality of DACs for performing digital-to-analog conversion on the signals after operation, the DAC realizes the digital-to-analog conversion by adopting an MCP4728 chip, the input of the DAC is connected with a CPU, the output of each DAC is connected with an external digital display voltmeter, the signal intensity values after the operation of the CPU are subjected to the digital-to-analog conversion through the DAC and then are output to the voltmeter, and the voltmeter displays the real-time signal intensity values (displayed in a voltage mode) of the corresponding channel;

the dial switches are used for starting all the channels, all the channels of the light emitting module are simultaneously opened while the dial switches are pressed down, the light receiving module receives signal values of all the channels at the moment, the signal strength sampled by the same test probe is the sum of the signal strengths of all the channels, and the value displayed by each corresponding digital display voltmeter is the sum of the signal strength values of all the channels;

the multi-channel analog switch, the ADC, the DACs and the dial switch are respectively connected with the CPU, and the whole detection control card is connected with an external power supply through a USB interface.

In this embodiment, a signal source input port is further disposed on the detection control card, the signal source input port is connected to the multi-path analog switch, and the signal source input port is configured to receive a test signal. The detection control card is also provided with a signal source output port, the signal source output port is connected with the multi-channel analog switch, and the signal source output port is used for outputting test signals of all channels. The signal source input port and the signal source output port both adopt HDMI interfaces.

In this embodiment, the device further includes a plurality of test signal output ends, a plurality of the monitor signal output ends are connected with a plurality of the DACs in a one-to-one correspondence manner, and the monitor signal output ends transmit corresponding electric signals output by the DACs to an external display device, for example, to an external digital display voltmeter.

As shown in fig. 2 to 12, the main circuits according to the present embodiment are as follows:

the CPU is realized by adopting an STM32F103VET6 chip, and the multi-path analog switch adopts two CMOS switches with the model number of TMUX1511 to respectively control the on and off of two channels, wherein the first multi-path analog switch controls a first channel SEL1 and a second channel SEL2, and the second multi-path analog switch controls a third channel SEL3 and a fourth channel SEL 4. The connection mode of the CPU and the multi-way analog switch comprises the following steps of STM32F103VET 6: the PA0 pin is connected to the SEL1 pin and the SEL2 pin of the first TMUX1511, the PA1 pin is connected to the SEL3 pin and the SEL4 pin of the first TMUX1511, the PA2 pin is connected to the SEL1 pin and the SEL2 pin of the second TMUX1511, and the PA3 pin is connected to the SEL3 pin and the SEL4 pin of the second TMUX 1511.

The connection mode of the multi-channel analog switch, the signal source input port HDMI-IN and the signal source output port HDMI-OUT comprises the following steps of: the pin S1 is connected with a DATA 2-pin of the HDMI-IN, the pin S2 is connected with a DATA2+ pin of the HDMI-IN, the pin S3 is connected with a DATA0+ pin of the HDMI-IN, the pin S4 is connected with a DATA 0-pin of the HDMI-IN, the pin D1 is connected with a X _ DATA 2-pin of the HDMI-OUT, the pin D2 is connected with a X _ DATA2+ pin of the HDMI-OUT, the pin D3 is connected with a X _ DATA0+ pin of the HDMI-OUT, and the pin D4 is connected with a X _ DATA 0-pin of the HDMI-OUT; the SEL1 pin of the first TMUX1511 is short-circuited with the SEL2 pin, the SEL1 pin is grounded after being connected with a pull-down resistor R32 in series, the S1 pin is grounded after being connected with a pull-down resistor R37 in series, the S2 pin is connected with a 3.3V power supply after being connected with a resistor R35 in series, the GND pin is grounded, the S3 pin is connected with a 3.3V power supply after being connected with a resistor R27 in series, the SEL4 pin is short-circuited with the SEL3 pin, the S4 pin is grounded after being connected with a pull-down resistor R29 in series, the VDD pin is connected to a +.

The connection mode of the multi-channel analog switch, the signal source input port HDMI-IN and the signal source output port HDMI-OUT also comprises that of a second TMUX 1511: the pin S1 is connected with a DATA1+ pin of the HDMI-IN, the pin D1 is connected with an X _ DATA1+ pin of the HDMI-OUT, the pin S2 is connected with a DATA 1-pin of the HDMI-IN, the pin D2 is connected with an X _ DATA 1-pin of the HDMI-OUT, the pin S3 is connected with a CLK-pin of the HDMI-IN, the pin D3 is connected with an X _ CLK-pin of the HDMI-OUT, the pin S4 is connected with a CLK + pin of the HDMI-IN, and the pin D4 is connected with an X _ CLK + pin of the HDMI-OUT. The SEL1 pin of the second TMUX1511 is in short circuit with the SEL2 pin, the SEL1 pin is connected with a pull-down resistor R44 in series and then grounded, the S1 pin is connected with a resistor R49 in series and then connected with a 3.3V power supply, the S2 pin is connected with a pull-down resistor R51 in series and then grounded, the GND pin is grounded, the S3 pin is connected with a pull-down resistor R43 in series and then grounded, the S4 pin is connected with a resistor R41 in series and then connected with a 3.3V power supply, the VDD pin is connected with a +5V power supply, and the.

The ADC of the embodiment adopts an ADC module arranged in the STM32F103VET6, and a PA6 pin of the STM32F103VET6 is connected with a test probe for detecting active optical cable signals. The PA7 pin, as a spare ADC input pin, may also perform the same function as the PA6 pin.

The DAC of the embodiment is realized by using an MCP4728 chip, a PB8 pin of STM32F103VET6 is connected with an LDAC pin of the MCP4728, a PB6 pin of STM32F103VET6 is connected with a DAC _ SCL pin of the MCP4728, and a PB7 pin of STM32F103VET6 is connected with a DAC _ SDA pin of the MCP 4728; a VDD pin of the MCP4728 is connected with a +5V power supply, a SCL pin of the MCP4728 is connected with a VDD pin after being connected with a resistor R20 in series, an SDA pin of the MCP4728 is connected with a resistor R19 in series and then connected with a VDD pin, the VDD pin of the MCP4728 is connected with a capacitor C1 and a capacitor C2 in series and then grounded, and a VSS pin of the MCP4728 is grounded; the VOUTA pin, the VOUTB pin, the VOUTC pin and the VOUTD pin of the MCP4728 are respectively used as four paths of test signal output ends and are respectively connected with four voltmeters.

The dial switch S1 adopts a normally open switch with at least four pairs of linkage contacts, wherein

pins

1, 2, 3 and 4 are one side of the normally open contact, and

pins

5, 6, 7 and 8 are the other side of the normally open contact. The PE2 pin, the PE3 pin, the PE4 pin and the PE5 pin of the STM32F103VET6 are respectively connected with the 5, 6, 7 and 8 pins of the dial switch S1, and the 1, 2, 3 and 4 pins of the dial switch are connected with a 3.3V power supply after being short-circuited. The 5, 6, 7 and 8 pins of the dial switch are respectively connected with the resistors R9, R10, R11 and R12 in series and then grounded. When the dial switch is pressed to close the normally open contact, the PE2 pin, the PE3 pin, the PE4 pin and the PE5 pin of the STM32F103VET6 are electrified.

The STM32F103VET6 is also provided with peripheral circuits such as a clock circuit, a reset circuit, a chip start circuit, etc., which are prior art and only briefly summarized here. The clock circuit comprises a crystal oscillator Y2 connected between an OSC _ IN pin and an OSC _ OUT pin of the STM32F103VET6 IN parallel, and two ends of the crystal oscillator Y2 are respectively connected with a capacitor C18 and a capacitor C23 IN parallel and then are grounded. The reset circuit is designed as follows: the NRST pin of the STM32F103VET6 is connected with a resistor R23 in series and then connected with a 3.3V power supply, the NRST pin is connected with a button switch K1 in series and then connected with the ground, and the button switch K1 is connected with a capacitor C29 in parallel. The chip starting circuit is designed as follows: a BOOT0 pin of the STM32F103VET6 is connected with a resistor R21 in series and then is connected with a 3.3V power supply, and a BOOT0 pin is connected with a resistor R24 in series and then is grounded; a BOOT1 pin of the STM32F103VET6 is connected with a resistor R22 in series and then is connected with a 3.3V power supply, and a BOOT1 pin is connected with a resistor R25 in series and then is grounded; the start mode of STM32F103VET6 can be set by setting the level of the BOOT0 pin and the level of the BOOT1 pin to be high, for example, when the BOOT0 pin is low, the system starts from an internal flash memory. The VBAT pin, the VDD _1 pin, the VDD _2 pin, the VDD _3 pin, the VDD _4 pin and the VDD _5 pin of the STM32F103VET6 are in short circuit, the VDD _5 pin is connected with a 3.3V power supply, the VDD _5 pin is grounded after being connected with an inductor L1 and a capacitor C22 in series, the capacitor C22 is connected with a capacitor C24 in parallel, and the VDDA pin and the VREF + pin are connected with a common node of the inductor L1 and the capacitor C22; the pin VDD _5 is serially connected with a capacitor C4 and then grounded, and a capacitor C8, a capacitor C9, a capacitor C19, a capacitor C20 and a capacitor C21 are also connected in parallel to the capacitor C4.

The embodiment further comprises a power conversion circuit which converts a 3.3V power supply provided by the USB into a +5V power supply and supplies power for the DAC of the detection control card and the multi-path virtual switch.

The utility model discloses an active optical cable passageway detects work flow that control card realized its function as follows:

the optical fiber detection device comprises a signal source, a signal source input port, a detection control card, a light emitting module, a test probe, a CPU (central processing unit) and a display, wherein the signal source input port is connected with the signal source and the detection control card, the signal source output port is connected with the detection control card and the light emitting module of an active optical cable, the output end of the test probe is connected with the CPU on the detection control card, the detection end of the test probe is connected with the light;

powering on the detection control card through the USB, and opening a signal source and a display;

the signal source transmits signals to the input end of a multi-channel analog switch on the detection control card, the multi-channel analog switch is connected with a first channel, the signals in the connected state are transmitted to a light emitting module of the active optical cable, a test probe detects a test point of a light receiving module of the active optical cable (due to space limitation, a plurality of channels share one test point), and the detected signals are sent to the detection control card;

performing analog/digital conversion by an ADC on the detection control card;

then, the CPU performs operations such as averaging and the like on the signal values in the sampling period;

performing digital-to-analog conversion on the calculated signal value through a DAC chip, and then transmitting the signal value to a voltmeter (a first voltmeter) corresponding to the first channel for displaying, wherein the signal displayed by the display is also the signal transmitted by the first channel;

the multi-channel analog switch closes a first channel, the multi-channel analog switch opens a second channel, the test process of the first channel is repeated until the signal intensity of all the channels of the multi-channel analog switch is tested, and the four voltmeters display the signal value of the corresponding single channel in real time;

rapidly circulating the test process of each channel of the multi-channel analog switch in sequence; because the active cable is adjusted by the operator during the mating process, the values shown on the four voltmeters change during the adjustment. After the adjustment is finished and the value displayed by the voltmeter is stable, the value of each channel is judged, and whether the signal intensity of each channel of the active optical cable under test is qualified or not can be judged according to the pre-specified standard.

After the signal value of each single channel is tested, the multi-channel analog switch opens all channels, the signal sampled by the light receiving module by the test probe is the sum of the signal values of all channels, the ADC performs analog/digital conversion on the sampled signal, the CPU performs operations such as averaging on the sampled signal, the DAC performs digital/analog conversion on the operated data and outputs the data to the voltmeter, the numerical values displayed by all the voltmeters are consistent, the numerical value is the sum of the signal values of all the channels, and the display displays the complete signal transmitted by all the channels; and then judging whether the sum of the signal values of all the channels is qualified according to a pre-specified standard.

The detection control card is added in the active optical cable high-speed matching process, the detection control card controls the high-speed analog switch through the CPU to realize frequency-adjustable channel switching, controls the ADC to acquire the signal intensity value of the current channel at the same time, and then sends the signal intensity value to the display equipment through different output channels of the DAC. When high-speed matching is realized, the channels are quickly switched, the signal intensity of the light receiving module corresponding to a single channel is synchronously detected, and the signal intensity of each channel can be simultaneously displayed through the display equipment; after the signal intensity of all the single channels is tested, all the channels are opened simultaneously, the sum of the signal intensity of the whole optical cable is detected, and the signal intensity of the single channel and the signal intensity of all the channels are detected, so that the signal intensity of each channel and all the channels of the optical cable can be detected accurately and quickly, the accuracy and the reliability of detection are improved, and the quality of the optical cable can be controlled more accurately.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides an active optical cable passageway detects control card, the optical cable is including the optical transmission module, the optical jumper and the optical receiving module who connects gradually, its characterized in that includes:

the multi-channel analog switch is used for carrying out switch control on the optical transmitting module channel;

ADC for sampling signal of light receiving module;

the dial switch is used for starting all channels;

2. The active optical cable channel detection control card of claim 1, further comprising a signal source input port, wherein the signal source input port is connected to the multi-way analog switch, and the signal source input port is configured to receive a test signal.

3. The active optical cable channel detection control card of claim 1, further comprising a signal source output port, wherein the signal source output port is connected to the multi-channel analog switch, and the signal source output port is used for outputting a test signal of each channel.

4. The active optical cable channel detection control card of claim 1, further comprising a plurality of test signal output terminals, wherein the plurality of monitor signal output terminals are connected to the plurality of DACs in a one-to-one correspondence manner, and the monitor signal output terminals transmit the corresponding electrical signals output by the DACs to an external display device.