A board status monitoring system and method suitable for OTN and WDM equipment

Abstract

The present invention discloses a board status monitoring system and method suitable for OTN and WDM equipment. The system includes a main control board, a backplane, and n single boards. The backplane is provided with n parallel-connected resistor components. Each single board is provided with a working ground and a reference power supply. The resistor components include pull-up resistors and pull-down resistors. The main control board is provided with an A / D detection circuit, a main control board reference power supply, and a main control board pull-up resistor. The resistor components are connected in parallel to the A / D detection pin on the main control board. The A / D detection pin on the main control board is also simultaneously connected to the input end of the A / D detection circuit and one end of the main control board pull-up resistor. The other end of the main control board pull-up resistor is connected to the main control board reference power supply. The present invention is based on the board status detection system and detection method provided by routers, switches, EPON, GPON, OTN, WDM, DWDM, and DCI equipment. It can save backplane space and connector pin resources on the main control board side and can also determine the power-on status of each single board.

Description

Technical Field

[0001] The present invention relates to the technical field of communication equipment, and in particular to a board status monitoring system and method applicable to OTN and WDM equipment. Background Art

[0002] Current communication equipment often uses a plug-in board architecture to increase switching capacity to meet the access, scheduling, and transmission needs of various services. Traditionally, each board in a plug-in board device has a reserved signal line connected directly to an independent I / O port on the main control board, enabling the main control board to detect the presence of each functional board. This approach is convenient for devices with limited backplane space and connector resources on the main control board side. However, it is inappropriate for devices with extremely limited backplane space and connector resources, such as routers, switches, EPON (Ethernet Passive Optical Network), GPON (Gigabit-Capable PON), OTN (Optical Transport Network), WDM (Wavelength Division Multiplexing), DWDM (Dense Wavelength Division Multiplexing), and DCI (Data Center Interconnect).

[0003] As attached Figure 1 The figure shows the connection method of multiple boards and the main control board in the prior art. A signal line is reserved at the backplane connector of each board and is directly connected to the independent I / O port of the logic device on the main control board. On the main control board, resistors R1, R2...R n Pull up to the reference power supply and directly ground inside the board. The main control board detects pins I / O1, I / O2...I / O N The presence status of each board in slots 1 through N is determined by the voltage level fluctuations at the board. With this approach, N boards occupy N backplane connector pins on the main control board and N logic device I / O ports on the main control board. This leads to the following problems: 1. The main control board consumes a significant amount of connector resources and backplane space, and a large number of I / O ports on the main control board are required for board presence detection. 2. This approach only detects board presence, not whether each board is properly powered on. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a board status monitoring system and method suitable for OTN and DCI equipment that can save backplane space and connector pin resources on the main control board side and at the same time judge the power-on status of each single board.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A board status monitoring system suitable for OTN and WDM equipment includes a main control board, a backboard, and n single boards. The backboard is provided with n parallel-connected resistor components, and the n resistor components correspond to the n single boards one-to-one. Each single board is provided with a working ground and a reference power supply. The resistor components include pull-up resistors and pull-down resistors. The pull-up resistors are connected to the reference power supply in the corresponding single board, and the pull-down resistors are connected to the working ground in the corresponding single board. The main control board is provided with an A / D detection circuit, a main control board reference power supply, and a main control board pull-up resistor. All the resistor components are connected in parallel and connected to an A / D detection pin on the main control board. The A / D detection pin on the main control board is also connected to an input end of the A / D detection circuit and one end of a pull-up resistor on the main control board. The other end of the pull-up resistor on the main control board is connected to the main control board reference power supply.

[0007] A method for monitoring the status of a card in an OTN or WDM device, the method using the above-mentioned card status monitoring system for the OTN or WDM device, comprising the following steps:

[0008] Step 1) Obtain the detection voltage value of the A / D detection circuit in the main control board:

[0009] Step 2) determining the in-position state and power-on state of each single board according to the corresponding relationship between the detection voltage value of the A / D detection circuit and the in-position state and power-on state of each single board.

[0010] Preferably, when all boards are in place and not powered on, all parallel pull-down resistors are effective, all parallel pull-up resistors are ineffective, and the detection voltage value of the A / D detection circuit in the main control board is determined by all parallel pull-down resistors;

[0011] When all boards are in place and powered on, all parallel pull-down resistors are effective, all parallel pull-up resistors are effective, and the detection voltage value of the A / D detection circuit in the main control board is jointly determined by all parallel pull-up resistors and all parallel pull-down resistors;

[0012] When all boards are in place and only some of the boards are powered on, all parallel pull-down resistors are valid, the pull-up resistors connected to the reference power supply in the powered-on boards are valid, and the detection voltage value of the A / D detection circuit in the main control board is determined by the valid parallel pull-up resistors and all parallel pull-down resistors.

[0013] When some boards are not in place, the pull-up resistors and pull-down resistors corresponding to the boards that are not in place are invalid, and the detection voltage value of the A / D detection circuit in the main control board is determined by the effective parallel pull-up resistors and effective parallel pull-down resistors corresponding to the boards in place.

[0014] Preferably, the resistance values ​​of all pull-down resistors are different, and when the in-place states of each single board are different combination values, the resistance values ​​formed by the effective parallel pull-down resistors are different; and when the in-place states and power-on states of each single board are different combination values, the voltage divider ratios formed by the effective parallel pull-up resistors and the effective parallel pull-down resistors are different.

[0015] Preferably, the voltage values ​​of the reference power supplies in all boards are equal and equal to the voltage value of the reference power supply of the main control board.

[0016] Preferably, the detection voltage value V of the A / D detection circuit in the main control board m The calculation formula is:

[0017]

[0018] Where: V cc The voltage value of the reference power supply of the main control board;

[0019] R s The resistance value of the effective parallel pull-down resistor corresponding to all the boards in place;

[0020] R p The resistance value of the effective parallel pull-up resistor corresponding to all powered-on boards;

[0021] R0 is the resistance value of the pull-up resistor on the main control board;

[0022] R p / / R0 is R p and the parallel resistance value of R0.

[0023] Preferably, the resistance value R of the effective parallel pull-down resistor corresponding to all the single boards in place is s The expression related to the status of each board is:

[0024] R s =(A&1)R 11 / / (B&1)R 21 / / … / / (H&1)R H1

[0025] Where A, B, ..., H represent the status of each board, and are 1 when in place and 0 when not in place.

[0026] R 11 、R 21 …RH1 Indicates the resistance value of the pull-down resistor connected to each board.

[0027] Preferably, the resistance value R of the effective parallel pull-up resistor corresponding to all powered-on boards is p The expression related to the power-on status of each board is:

[0028] R p =(a&1)R 12 / / (b&1)R 22 / / … / / (h&1)R h2

[0029] Where a, b, ..., h represent the power-on status of each board, and are 1 when powered on and 0 when not powered on.

[0030] R 12 、R 22 …R h2 Indicates the resistance value of the pull-up resistor connected to each board.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. This invention significantly reduces the number of inter-board signals. The main control board only needs to occupy one backplane connector pin to determine the presence and power-on status of all slot boards, greatly saving backplane space and connector resources on the main control board side.

[0033] 2. In the present invention, the presence status and power-on status of any slot board will affect the detection voltage value of the A / D detection circuit of the main control board. At this time, the main control board can determine the presence status and power-on status of all slot boards based on the detection voltage value of the A / D detection circuit.

[0034] 3. The present invention can not only judge the in-place status of a single board, but also judge whether the single board is normally powered on, thereby facilitating troubleshooting.

[0035] 4. The present invention can simultaneously detect the presence and power-on status of multiple slot boards based on the difference in electrical level values ​​at the connector pins of the backplane, thereby improving detection efficiency.

[0036] 5. The board status monitoring system and method of the present invention are not only applicable to OTN and WDM equipment, but also to routers, switches, EPON, GPON, DCI, DWDM and other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a connection method between multiple boards and the main control board in the existing technology;

[0038] Figure 2The present invention is a connection block diagram of a board status monitoring system applicable to OTN and WDM equipment. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs.

[0040] The words “first”, “second” and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of “a”, “an” or “the” and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. Words such as “include” or “comprise” mean that the elements or objects appearing before “include” or “comprises” cover the features, wholes, steps, operations, elements and / or components listed after “include” or “comprises”, and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. “Up”, “down”, “left”, “right” and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] As attached Figure 2 As shown, a board status monitoring system suitable for OTN and WDM equipment includes a main control board, a backplane, and n single boards. The backplane is provided with n parallel-connected resistor components, and the n resistor components correspond one-to-one to the n single boards. Each single board is provided with a working ground and a reference power supply. The resistor components include pull-up resistors and pull-down resistors. The pull-up resistors are connected to the reference power supply in the corresponding single board, and the pull-down resistors are connected to the working ground in the corresponding single board. The main control board is provided with an A / D detection circuit, a main control board reference power supply, and a main control board pull-up resistor. After all the resistor components are connected in parallel, they are connected to the A / D detection pin on the main control board. The A / D detection pin on the main control board is also connected to the input end of the A / D detection circuit and one end of the main control board pull-up resistor R0. The other end of the main control board pull-up resistor R0 is connected to the main control board reference power supply. Specifically, the pull-up resistors corresponding to the single board in slot 1, the single board in slot 2, the single board in slot 3...the single board in slot H are R respectively. 12 、R 22 、R32 …R h2 The pull-down resistors corresponding to the boards in slot 1, slot 2, slot 3, and slot H are R 11 、R 21 、R 31 …R H1 .

[0042] A method for monitoring the status of a card in an OTN or WDM device, the method using the above-mentioned card status monitoring system for the OTN or WDM device, comprising the following steps:

[0043] Step 1) Obtain the detection voltage value of the A / D detection circuit in the main control board:

[0044] Step 2) Determine the in-position state and power-on state of each board based on the corresponding relationship between the detection voltage value of the A / D detection circuit and the in-position state and power-on state of each board.

[0045] In this embodiment, when all boards are in place and not powered on, all parallel pull-down resistors are effective, and all parallel pull-up resistors are ineffective. The detection voltage value of the A / D detection circuit in the main control board is determined by all parallel pull-down resistors.

[0046] When all boards are in place and powered on, all parallel pull-down resistors are effective, and all parallel pull-up resistors are effective. The detection voltage value of the A / D detection circuit in the main control board is determined by all parallel pull-up resistors and all parallel pull-down resistors.

[0047] When all boards are in place and only some are powered on, all parallel pull-down resistors are effective. The pull-up resistors connected to the reference power supply in the powered-on boards are effective. The detection voltage value of the A / D detection circuit in the main control board is determined by the effective parallel pull-up resistors and all parallel pull-down resistors.

[0048] When some boards are not in place, the pull-up resistors and pull-down resistors corresponding to the absent boards are invalid. The detection voltage value of the A / D detection circuit in the main control board is determined by the effective parallel pull-up resistors and effective parallel pull-down resistors corresponding to the present boards.

[0049] In this embodiment, the resistance values ​​of all pull-down resistors are different, and when the in-place states of each single board are different combination values, the resistance values ​​formed by the effective parallel pull-down resistors are different; and when the in-place states and power-on states of each single board are different combination values, the voltage divider ratios formed by the effective parallel pull-up resistors and the effective parallel pull-down resistors are different.

[0050] In this embodiment, the voltage values ​​of the reference power supplies in all boards are equal and are equal to the voltage value of the reference power supply of the main control board.

[0051] In this embodiment, the detection voltage value V of the A / D detection circuit in the main control board is m The calculation formula is:

[0052]

[0053] Where: V cc The voltage value of the reference power supply of the main control board;

[0054] R s The resistance value of the effective parallel pull-down resistor corresponding to all the boards in place;

[0055] R p The resistance value of the effective parallel pull-up resistor corresponding to all powered-on boards;

[0056] R0 is the resistance value of the pull-up resistor on the main control board;

[0057] R p / / R0 is R p and the parallel resistance value of R0.

[0058] Specifically, when all slot boards have no effective pull-up resistors, R p Considered as open circuit, R p / / R0 is equivalent to R0.

[0059] In this embodiment, the resistance value of the effective parallel pull-down resistor corresponding to all the single boards in place is R s The expression related to the status of each board is:

[0060] R s =(A&1)R 11 / / (B&1)R 21 / / … / / (H&1)R H1

[0061] Where A, B, ..., H represent the status of each board, and are 1 when in place and 0 when not in place.

[0062] R 11 、R 21 …R H1 Indicates the resistance value of the pull-down resistor connected to each board.

[0063] Specifically, A, B...H represent the in-place status of the board in slot 1, the board in slot 2...the board in slot H, respectively. In this specific embodiment, 8 boards in slots are taken as an example for explanation. The in-place status of the boards in the 8 slots are represented by A, B, C, D, E, F, G, and H, respectively. When the boards in slots 1, 2, and 3 are in place and the boards in other slots are not in place, the in-place status of each board ABCDEFGH can be represented as 11100000. At this time, the calculation results of A&1, B&1, and C&1 are 1 (that is, true), and R 11 、R 21 、R 31 The three pull-up resistors are valid, and the operation results of D&1, E&1, F&1, G&1, and H&1 are 0 (i.e. false), R 41 、R 51 、R 61 、R 71 、R 81 The five pull-up resistors are invalid and considered open circuit. At this time, the resistance value of the effective parallel pull-down resistor corresponding to all the single boards in place is R s That is R 11 、R 21 、R 31 The resistance value of three pull-up resistors connected in parallel.

[0064] In this embodiment, the resistance value of the effective parallel pull-up resistor corresponding to all powered-on boards is R p The expression related to the power-on status of each board is:

[0065] R p =(a&1)R 12 / / (b&1)R 22 / / … / / (h&1)R h2

[0066] Where a, b, ..., h represent the power-on status of each board, and are 1 when powered on and 0 when not powered on.

[0067] R 12 、R 22 …R h2 Indicates the resistance value of the pull-up resistor connected to each board.

[0068] Specifically, a, b...h represent the power-on status of the board in slot 1, the board in slot 2...the board in slot H, respectively. In this specific embodiment, 8 boards in slots are taken as an example for explanation. The power-on status of the boards in the 8 slots are represented by a, b, c, d, e, f, g, and h, respectively. When the boards in slots 1, 2, and 3 are powered on (the boards in slots 1, 2, and 3 are powered on, which means that the boards in slots 1, 2, and 3 are also in the on-state), and the boards in other slots are not powered on, the power-on status of each board abcdefgh can be represented as 11100000. At this time, the calculation results of a&1, b&1, and c&1 are 1 (that is, true), and R 12 、R 22 、R 32 The three pull-down resistors are valid, and the operation results of d&1, e&1, f&1, g&1, and h&1 are 0 (i.e. false), R 42 、R 52 、R 62 、R 72 、R 82 The five pull-down resistors are invalid and considered open circuit. At this time, the resistance value of the effective parallel pull-down resistor corresponding to all powered-on boards is R p That is R 12 、R 22 、R 32 The resistance value of three pull-down resistors connected in parallel.

[0069] When the present invention is used, it is necessary to meet the requirements that the resistance values ​​of all pull-down resistors are different, and when the device single board in-position states ABCD...H are different combination values, the resistance value R of the effective parallel pull-down resistor corresponding to all in-position single boards is s The voltage divider ratios formed by the effective pull-up resistors and the effective pull-down resistors in parallel also vary when the device board status AaBbCc... takes different combinations. If all the aforementioned conditions are met, the presence and power-on status of any board in any slot will affect the level of the presence signal. The main control board can then determine the presence and power-on status of all boards in the slots based on the level of the presence signal.

[0070] The following is a specific example to illustrate how the present invention detects the presence and power-on status of each board. Assume that the plug-in device has three slots, namely slot 1, slot 2, and slot 3. The voltage values ​​of the reference power supply and the main control board reference power supply are both 3.3V. The voltage range detected by the A / D detection circuit is 0 to 3.3V. The pull-up resistor and pull-down resistor are set as shown in Table 1 below:

[0071] R11 R12 R21 R22 R31 R32 R0 Resistance value / Ohm 10 16 12 18 15 20 1000

[0072] The status of different boards in place, power-on status, and voltage values ​​detected by the A / D detection circuit are shown in Table 2:

[0073] Slot 1 Slot 2 Slot 3 Aa Bb Cc Detection voltage / V 00 00 00 3.300 00 00 10 0.049 00 00 11 1.430 00 10 00 0.039 00 10 10 0.022 00 10 11 0.837 00 11 00 1.334 00 11 10 0.904 00 11 11 1.371 10 00 00 0.033 10 00 10 0.020 10 00 11 0.773 10 10 00 0.018 10 10 10 0.013 10 10 11 0.559 10 11 00 0.778 10 11 10 0.609 10 11 11 0.986 11 00 00 1.282 11 00 10 0.910 11 00 11 1.337 11 10 00 0.849 11 10 10 0.668 11 10 11 1.030 11 11 00 1.299 11 11 10 1.065 11 11 11 1.331

[0074] In the above table, A, B, and C are 1, which means that the board in slot 1 is in place, the board in slot 2 is in place, and the board in slot 3 is in place respectively. A, B, and C are 0, which means that the board in slot 1 is not in place, the board in slot 2 is not in place, and the board in slot 3 is not in place respectively. A, b, and c are 1, which means that the board in slot 1 is powered on, the board in slot 2 is powered on, and the board in slot 3 is powered on. A, b, and c are 0, which means that the board in slot 1 is not powered on, the board in slot 2 is not powered on, and the board in slot 3 is not powered on. As can be seen from the above table, the maximum value of the detection level is equal to the voltage value of the reference power supply of the main control board, and the minimum interval of the detection level is 0.002V. When the in-place status and power-on status of the boards in the three slots are different combinations, the voltage values ​​obtained by detection are different. Therefore, this solution can determine the in-place status and power-on status of each board by detecting the voltage value. At the same time, according to 3.3 / 2 11 = 0.0016. The calculation shows that the A / D detection circuit here must achieve 11-bit accuracy. The A / D detection circuit can be implemented using logic device pins or a dedicated A / D detection chip. In practice, the difference between the voltage levels of each state can be increased by adjusting the pull-up and pull-down resistors, thereby reducing the accuracy requirements of the A / D detection circuit.

[0075] Compared with the prior art, the present invention significantly reduces the number of inter-board signals. The main control board side only needs to occupy one backplane connector pin to judge the in-place status and power-on status of all slot boards, which greatly saves the backplane space and connector resources on the main control board side. In the present invention, the in-place status and power-on status of any slot board will affect the detection voltage value of the main control board A / D detection circuit. At this time, the main control board can judge the in-place status and power-on status of all slot boards according to the detection voltage value of the A / D detection circuit. The present invention can not only judge the in-place status of the board, but also judge whether the board is powered on normally, which is conducive to troubleshooting. The present invention can simultaneously detect the in-place status and power-on status of multiple slot boards based on the difference in the level values ​​at the connector pins of the backplane, thereby improving detection efficiency.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present invention that do not depart from the purpose and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A card status monitoring system suitable for OTN and WDM equipment, characterized in that: The system comprises a main control board, a backboard, and n single boards. The backboard is provided with n parallel-connected resistor components, and the n resistor components correspond one-to-one to the n single boards. Each single board is provided with a working ground and a reference power supply. The resistor components include pull-up resistors and pull-down resistors. The pull-up resistors are connected to the reference power supply in the corresponding single board, and the pull-down resistors are connected to the working ground in the corresponding single board. The main control board is provided with an A / D detection circuit, a main control board reference power supply, and a main control board pull-up resistor. All the resistor components are connected in parallel and connected to the A / D detection pin on the main control board. The A / D detection pin on the main control board is also connected to the input end of the A / D detection circuit and one end of the main control board pull-up resistor. The other end of the main control board pull-up resistor is connected to the main control board reference power supply. The resistance values ​​of all pull-down resistors are different, and when the in-place states of each single board are different combination values, the resistance values ​​formed by the effective parallel pull-down resistors are different; and when the in-place states and power-on states of each single board are different combination values, the voltage divider ratios formed by the effective parallel pull-up resistors and the effective parallel pull-down resistors are different; the voltage values ​​of the reference power supplies in all single boards are equal and equal to the voltage value of the reference power supply of the main control board.

2. A board status monitoring method applicable to OTN and WDM equipment, characterized in that: The method uses the board status monitoring system applicable to OTN and WDM equipment as claimed in claim 1, comprising the following steps: Step 1) Obtain the detection voltage value of the A / D detection circuit in the main control board: Step 2) determining the in-position state and power-on state of each single board according to the corresponding relationship between the detection voltage value of the A / D detection circuit and the in-position state and power-on state of each single board.

3. The board status monitoring method applicable to OTN and WDM equipment according to claim 2 is characterized in that: When all boards are in place and not powered on, all parallel pull-down resistors are valid and all parallel pull-up resistors are invalid. The detection voltage value of the A / D detection circuit in the main control board is determined by all parallel pull-down resistors. When all boards are in place and powered on, all parallel pull-down resistors are effective, all parallel pull-up resistors are effective, and the detection voltage value of the A / D detection circuit in the main control board is jointly determined by all parallel pull-up resistors and all parallel pull-down resistors; When all boards are in place and only some of the boards are powered on, all parallel pull-down resistors are valid, the pull-up resistors connected to the reference power supply in the powered-on boards are valid, and the detection voltage value of the A / D detection circuit in the main control board is determined by the valid parallel pull-up resistors and all parallel pull-down resistors. When some boards are not in place, the pull-up resistors and pull-down resistors corresponding to the boards that are not in place are invalid, and the detection voltage value of the A / D detection circuit in the main control board is determined by the effective parallel pull-up resistors and effective parallel pull-down resistors corresponding to the boards in place.

4. The board status monitoring method applicable to OTN and WDM equipment according to claim 3 is characterized in that: The detection voltage value V of the A / D detection circuit in the main control board m The calculation formula is: Where: V cc The voltage value of the reference power supply of the main control board; R s The resistance value of the effective parallel pull-down resistor corresponding to all the boards in place; R p The resistance value of the effective parallel pull-up resistor corresponding to all powered-on boards; R0 is the resistance value of the pull-up resistor on the main control board; R p / / R0 is R p and the parallel resistance value of R0.

5. The board status monitoring method applicable to OTN and WDM equipment according to claim 4 is characterized in that: The resistance value R of the effective parallel pull-down resistor corresponding to all the boards in place s The expression related to the status of each board is: R s =(A&1)R 11 / / (B&1)R 21 / / … / / (H&1)R H1 Where A, B, ..., H represent the status of each board, and are 1 when in place and 0 when not in place. R 11 、R 21 …R H1 Indicates the resistance value of the pull-down resistor connected to each board.

6. The board status monitoring method applicable to OTN and WDM equipment according to claim 4 is characterized in that: The resistance value R of the effective parallel pull-up resistor corresponding to all powered-on boards p The expression related to the power-on status of each board is: R p =(a&1)R 12 / / (b&1)R 22 / / … / / (h&1)R h2 Where a, b, ..., h represent the power-on status of each board, and are 1 when powered on and 0 when not powered on. R 12 、R 22 …R h2 Indicates the resistance value of the pull-up resistor connected to each board.

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