CN116233661A - Network equipment and optical module access control method - Google Patents
Network equipment and optical module access control method Download PDFInfo
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- CN116233661A CN116233661A CN202310506593.8A CN202310506593A CN116233661A CN 116233661 A CN116233661 A CN 116233661A CN 202310506593 A CN202310506593 A CN 202310506593A CN 116233661 A CN116233661 A CN 116233661A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
Abstract
The embodiment of the application provides a network device and a control method for optical module access, wherein the network device comprises: the device comprises an optical port, an in-place detection circuit, a first switching circuit, a second switching circuit, a first control circuit, a second control circuit, a judging circuit and a voltage dividing circuit; the first switching circuit is connected between the first type pin of the optical port and the first control circuit, and the second switching circuit is connected between the second type pin of the optical port and the second control circuit; the first control circuit and the second control circuit are used for processing the received signals; the in-place detection circuit is connected between a first designated pin of the optical port and the first control circuit and is used for detecting whether an optical module is connected to the optical port or not; the judging circuit is connected between the third type pin of the optical port and the first control circuit and is used for detecting the type of the optical module connected to the optical port; the voltage dividing circuit includes a first pull-up circuit for limiting a current of the first switching circuit and a first pull-down circuit for dividing a voltage supplied from the constant power supply.
Description
Technical Field
The present disclosure relates to the field of optical communications technologies, and in particular, to a control method for access of a network device and an optical module.
Background
In the field of optical communications, in order to ensure the versatility of optical modules produced by different manufacturers, standard specifications for different types of optical modules are formulated. The existing optical modules include SFP (Small Form-factor Pluggable), sfp+ and other single-channel optical modules, CSFP (Compact Small Form-factor Pluggable), csfp+ and other dual-channel optical modules, and the like. In the standard specification of the optical modules, the external dimensions of the different types of optical modules are the same, but the pin definitions are different, so that the different types of optical modules cannot be directly replaced.
However, the single use of one type of optical module will result in limited cost and range of use of the network device. For example, a network device supporting only SFP/sfp+ optical modules, which allows fewer optical modules to be accessed; only network equipment supporting CSFP/CSFP+ optical modules is high in cost. In view of this, how to make the network device compatible with different types of optical modules at the same time is a technical problem to be solved.
Disclosure of Invention
An object of the embodiments of the present application is to provide a network device and a control method for accessing an optical module, so as to enable the network device to be compatible with optical modules of different types at the same time, improve flexibility of application of the network device, reduce cost of the network device, and expand application range of the network device. The specific technical scheme is as follows:
In a first aspect of embodiments of the present application, a network device is provided, where the network device includes an optical port, an in-place detection circuit, a first switching circuit, a second switching circuit, a first control circuit, a second control circuit, a discrimination circuit, and a voltage division circuit;
the first switching circuit is connected between a first type of pin of the optical port and the first control circuit, the second switching circuit is connected between a second type of pin of the optical port and the second control circuit, the first type of pin is defined as a pin which is grounded or transmits low-speed signals, and the second type of pin is defined as a pin which is grounded or transmits high-speed signals or transmits low-speed signals; the first control circuit and the second control circuit are used for processing received signals;
the in-place detection circuit is connected between a first designated pin of the optical port and the first control circuit and is used for detecting whether an optical module is connected to the optical port or not, and the first designated pin is defined as a grounded pin;
the judging circuit is connected between a third type of pins of the optical port and the first control circuit and is used for detecting the type of an optical module connected to the optical port, and the third type of pins are defined as pins for transmitting IIC signals;
The voltage dividing circuit comprises a first pull-up circuit and a first pull-down circuit; one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the first switching circuit and used for limiting the current of the first switching circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the first switching circuit and is used for dividing the voltage provided by the constant power supply.
In some embodiments, the bit detection circuit includes a first connection circuit, a second pull-up circuit, and a second pull-down circuit;
the first connection circuit is connected between a first designated pin of the optical port and the first control circuit;
the second pull-up circuit is connected between the constant voltage power supply and the first connecting circuit and used for limiting the current of the first connecting circuit;
the second pull-down circuit is connected between the first connection circuit of the optical port and the ground and is used for dividing the voltage provided by the constant power supply.
In some embodiments, the pin adjacent to the first designated pin is a pin defined to transmit a low speed signal or ground.
In some embodiments, the first type of pins includes a second designated pin, and pins adjacent to the second designated pin include pins defined to transmit high speed signals;
The first switching circuit comprises a second connection circuit connected between the second designated pin and the first control circuit;
one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the second connecting circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the second connection circuit.
In some embodiments, the first control circuit is specifically configured to:
when the in-place detection circuit detects that an optical module is connected to the optical port, and the discrimination circuit determines a first type optical module of the optical module, the second connection circuit is connected with one end of the first control circuit to be grounded, and the first type optical module defines the second designated pin to be grounded;
when the in-place detection circuit detects that an optical module is connected to the optical port, and the discrimination circuit determines a second type optical module of the optical module, a path between one end of the second connection circuit connected with the first control circuit and the ground is cut off, and the second type optical module defines the second designated pin to transmit a low-speed signal.
In some embodiments, the second connection circuit includes a first connection sub-circuit, a second connection sub-circuit, a third connection sub-circuit, and a switch, the first connection sub-circuit being connected between the second designated pin and the switch, the second connection sub-circuit and the third connection sub-circuit being connected between the switch and the first control circuit, respectively;
The first control circuit is specifically configured to:
when the in-place detection circuit detects that an optical module is connected to the optical port, and the discrimination circuit determines a first type optical module of the optical module, a first signal is transmitted to the change-over switch through the third connection sub-circuit, and the first type optical module defines that the second designated pin is grounded; when the in-place detection circuit detects that an optical module is connected to the optical port and the discrimination circuit determines a second type optical module of the optical module, a second signal is transmitted to the change-over switch through the third connection sub-circuit, and the second type optical module defines the second designated pin to transmit a low-speed signal;
the switch is used for cutting off a passage between the first connection sub-circuit and the second connection sub-circuit according to the first signal and grounding the first connection sub-circuit; and communicating a path between the first connection sub-circuit and the second connection sub-circuit according to the second signal.
In some embodiments, the distance between the switch and the light port is less than a first preset distance.
In some embodiments, the first pull-up circuit and the second connection circuit are connected at a first connection point, a distance between the first connection point and the second designated pin being less than a second preset distance;
The distance between the first control circuit and the light port is smaller than a third preset distance.
In a second aspect of the embodiments of the present application, a method for controlling access of an optical module is provided, where the method is applied to any one of the network devices, and the method includes:
detecting whether an optical module is accessed or not through an in-place detection circuit;
if the optical module is detected to be accessed, determining the type of accessing the optical module through the judging circuit;
and processing signals sent by the optical module according to the type of the optical module.
In some embodiments, the first type of pins includes a second designated pin, and pins adjacent to the second designated pin include pins defined to transmit high speed signals; the first switching circuit comprises a second connection circuit connected between the second designated pin and the first control circuit; one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the second connecting circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the second connecting circuit;
the method further comprises the steps of:
when a first type optical module of the optical module is used, the second connecting circuit is connected with one end of the first control circuit to be grounded, and the first type optical module defines the second designated pin to be grounded;
And when the second type optical module of the optical module is used, a path between one end of the second connection circuit connected with the first control circuit and the ground is cut off, and the second type optical module defines the second designated pin to transmit a low-speed signal.
In some embodiments, the first type of pins includes a second designated pin, and pins adjacent to the second designated pin include pins defined to transmit high speed signals; the first switching circuit comprises a second connection circuit connected between the second designated pin and the first control circuit; one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the second connecting circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the second connecting circuit;
the second connection circuit comprises a first connection sub-circuit, a second connection sub-circuit, a third connection sub-circuit and a change-over switch, wherein the first connection sub-circuit is connected between the second designated pin and the change-over switch, and the second connection sub-circuit and the third connection sub-circuit are respectively connected between the change-over switch and the first control circuit;
The method further comprises the steps of:
when a first type optical module of the optical module is used, the third connection sub-circuit is used for controlling the change-over switch to cut off a passage between the first connection sub-circuit and the second connection sub-circuit and grounding the first connection sub-circuit, and the first type optical module defines that the second designated pin is grounded;
and when the second type optical module of the optical module is used, the third connection sub-circuit is used for controlling the switch to be communicated with a passage between the first connection sub-circuit and the second connection sub-circuit, and the second type optical module defines the second designated pin to transmit a low-speed signal.
The beneficial effects of the embodiment of the application are that:
in the technical scheme provided by the embodiment of the application, the in-place detection circuit and the discrimination circuit are deployed in the network equipment so as to finish the access of the optical module and the judgment of the type of the optical module through different pins, and further finish the accurate processing of the signals of the optical modules of different types. The method realizes that the network equipment is compatible with different types of optical modules at the same time, improves the application flexibility of the network equipment, reduces the cost of the network equipment and expands the application range of the network equipment. In addition, a voltage dividing circuit is also arranged in the network equipment, and based on a first pull-up circuit and a first pull-down circuit which are included in the voltage dividing circuit, the current of the first switching circuit can be limited, the voltage provided by a constant power supply is divided, the voltage of one end of the first pull-up circuit connected with the first switching circuit is ensured, and the reliability of signal transmission is improved; in addition, through the first pull-down circuit, partial interference can be transmitted into the ground, so that the adverse effect of the interference on the signal transmitted by the optical module is reduced, and the reliability of signal transmission is further improved. Therefore, in the embodiment of the application, the network equipment is compatible with different types of optical modules, and meanwhile, the reliability of signal transmission is improved.
Of course, not all of the above-described advantages need be achieved simultaneously in practicing any one of the products or methods of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly introduce the drawings that are required to be used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other embodiments may also be obtained according to these drawings to those skilled in the art.
Fig. 1 is a schematic structural diagram of a first network device according to an embodiment of the present application;
fig. 2 is a schematic diagram of a second structure of a network device according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a first switching circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a second switching circuit according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of an embodiment of an in-place detection circuit;
fig. 6a is a third schematic structural diagram of a network device according to an embodiment of the present application;
fig. 6b is a schematic structural diagram of a second connection circuit according to an embodiment of the present application;
fig. 7 is a schematic flow chart of a method for controlling optical module access according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. Based on the embodiments herein, a person of ordinary skill in the art would be able to obtain all other embodiments based on the disclosure herein, which are within the scope of the disclosure herein.
In the field of optical communications, in order to ensure the versatility of optical modules produced by different manufacturers, standard specifications for different types of optical modules are formulated. The current optical modules comprise SFP, SFP+ and other optical modules of single-channel type, CSFP, CSFP+ and other optical modules of double-channel type, and the like. In the standard specification of the optical modules, the external dimensions of the different types of optical modules are the same, but the pin definitions are different, so that the different types of optical modules cannot be directly replaced.
As shown in Table 1, the pin definitions of the different optical modules are the same for SFP and SFP+, CSFP and CSFP+ and SFP/SFP+ are different.
TABLE 1
The single use of one type of optical module will result in limited cost and range of use of the network device. For example, a network device supporting only SFP/sfp+ optical modules, which allows fewer optical modules to be accessed; only network equipment supporting CSFP/CSFP+ optical modules is high in cost.
In order to solve the above problem, an embodiment of the present application provides a network device, as shown in fig. 1, including: an optical port 101, an in-bit detection circuit 102, a first switch circuit 103, a second switch circuit 104, a first control circuit 105, a second control circuit 106, a discrimination circuit 107, and a voltage division circuit 108;
the first switch circuit 103 is connected between a first type pin of the optical port 101 and the first control circuit 105, the second switch circuit 104 is connected between a second type pin of the optical port 101 and the second control circuit 106, the first type pin is a pin defined as a ground or a low-speed signal transmission, and the second type pin is a pin defined as a ground or a high-speed signal transmission or a low-speed signal transmission; the first control circuit 105 and the second control circuit 106 are used for processing the received signals;
the bit detection circuit 102 is connected between a first designated pin of the optical port 101 and the first control circuit 105, and is used for detecting whether an optical module is connected to the optical port 101, and the first designated pin is defined as a grounded pin;
the discrimination circuit 107 is connected between a third type of pin of the optical port 101, which is defined as a pin for transmitting an IIC (Inter Integrated Circuit, inter-integrated circuit) signal, and the first control circuit 105, and is used for detecting a type of an optical module connected to the optical port 101;
The voltage dividing circuit 108 includes a first pull-up circuit and a first pull-down circuit; one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the first switching circuit 103 and is used for limiting the current of the first switching circuit 103; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected to the first switching circuit 103 for dividing the voltage provided by the constant power supply.
In the technical scheme provided by the embodiment of the application, the in-place detection circuit and the discrimination circuit are deployed in the network equipment so as to finish the access of the optical module and the judgment of the type of the optical module through different pins, and further finish the accurate processing of the signals of the optical modules of different types. The method realizes that the network equipment is compatible with different types of optical modules at the same time, improves the application flexibility of the network equipment, reduces the cost of the network equipment and expands the application range of the network equipment. In addition, a voltage dividing circuit is also arranged in the network equipment, and based on a first pull-up circuit and a first pull-down circuit which are included in the voltage dividing circuit, the current of the first switching circuit can be limited, the voltage provided by a constant power supply is divided, the voltage of one end of the first pull-up circuit connected with the first switching circuit is ensured, and the reliability of signal transmission is improved; in addition, through the first pull-down circuit, partial interference can be transmitted into the ground, so that the adverse effect of the interference on the signal transmitted by the optical module is reduced, and the reliability of signal transmission is further improved. Therefore, in the embodiment of the application, the network equipment is compatible with different types of optical modules, and meanwhile, the reliability of signal transmission is improved.
In this embodiment of the present application, the first type of pin is a pin defined as a ground or transmitting a low-speed signal, that is, for different types of optical modules, one pin may be defined as a ground or transmitting a low-speed signal, but may not be defined as transmitting a high-speed signal, and then the pin belongs to the first type of pin. For example, in table 1, pins 2, 3, 8, 14, and 17 are the first type pins. The first control circuit 105 may be implemented by a CPLD (Complex Programmable Logic Device ) or other signal processing units, which is not limited thereto. The connection relationship among the optical port 101, the first switching circuit 103 and the first control circuit 105 is shown in fig. 3.
One end of the first switching circuit 103 is connected to a first type pin of the optical port 101, and the other end is connected to the first control circuit 105. This ensures that the first type pin transmitted signals can be passed to the first control circuit 105 and that the first control circuit 105 processes the signals. In this embodiment, the first switching circuit 103 may be configured with one or more resistors to limit the current flowing into the first control circuit 105, so as to prevent the chip connected to the first type pin in the first control circuit 105 from being damaged. The structure of the specific first switch circuit 103 is not particularly limited.
The second type of pin is a pin defined as ground or transmitting high speed signals or transmitting low speed signals, i.e. for different types of optical modules, one pin may be defined as ground, also as transmitting low speed signals, and also as transmitting high speed signals, which belongs to the second type of pin. For example, in table 1, pin 6, pin 7, pin 9, pin 10, pin 12, pin 13, pin 18, and pin 19 are the second type pins. The second control circuit 106 may be implemented by a communication chip or other signal processing unit, which is not limited thereto. The connection relationship among the optical port 101, the second switching circuit 104 and the second control circuit 106 is shown in fig. 4.
One end of the second switching circuit 104 is connected to the second type pin of the optical port 101, and the other end is connected to the second control circuit 106. This ensures that the second type of pin transmitted signals can be passed to the second control circuit 106 and the second control circuit 106 processes the signals. In this embodiment, the second switching circuit 104 may be configured with one or more resistors to limit the current flowing into the second control circuit 106, so as to prevent the chip connected to the second type pin in the second control circuit 106 from being damaged. The structure of the specific second switch circuit 104 is not particularly limited.
In some embodiments, the second class of pins includes a first subclass of pins and a second subclass of pins. The first subclass of pins is pins defined to transmit high speed signals, such as pin 12, pin 13, pin 18, pin 19; the second sub-class pins are pins, such as pin 6, pin 7, pin 9, and pin 10, of the second class pins except the first sub-class pins.
The second switching circuit 104 may comprise a capacitor 401, one side of the capacitor 401 being connected to the second sub-class pin and the other side of the capacitor 401 being connected to the second control circuit 106. In the network device shown in fig. 2 and 4, one side of the capacitor 401 is connected to the pin 6, the pin 7, the pin 9, and the pin 10, and the other side of the capacitor 401 is connected to the communication chip (i.e., the second control circuit 106). Based on the capacitor 401, the optical module can be used for preventing the communication chip from being damaged when the single-channel optical module is connected to the optical port 101, so that the second control circuit 106 can be normally used no matter the single-channel optical module is connected to the optical port 101, or the dual-channel optical module is connected to the optical port 101, and the second control circuit 106 is prevented from being damaged.
In the embodiment of the present application, the first designated pin is a pin defined as ground, such as pin 1, pin 11, and pin 20 in table 1. One end of the bit detection circuit 102 is connected to a first designated pin, and the other end of the bit detection circuit 102 is connected to a first control circuit 105.
To improve signal quality, the pins adjacent to the first designated pin may be pins defined as transmitting low-speed signals or grounded. The pins to ground may be one or more, such as pin 1, pin 11, and pin 20 in table 1 above. The adjacent pins are pins for transmitting the transmission failure indication signals, for example, pin 1, pin 2 beside pin 1 is a pin for transmitting the transmission failure indication signals, and the transmission failure indication signals are low-speed signals; some of the ground pins have adjacent pins that may be defined as pins for transmitting high-speed signals, such as pin 11 and pin 20 in table 1 above, pin 11 being defined as transmitting high-speed signals in a two-channel optical module, and pin 20 being defined as transmitting high-speed signals in both a single-channel optical module and a two-channel optical module. The electromagnetic interference generated by the low-speed signal is small, and the reliability requirement on signal transmission is low; the electromagnetic interference generated by the high-speed signal is large, and the reliability requirement on signal transmission is high. In this embodiment of the present application, the first designated pin is used as an in-place detection end, and is used for detecting whether an optical module is connected to the optical port 101, so that the adjacent pins can be ensured to be reliably grounded for transmitting high-speed signals (such as the pins 11 and 20), and signal quality is improved.
In some embodiments, to improve signal reliability, as shown in fig. 5, the bit detection circuit 102 may include a first connection circuit 1020, a second pull-up circuit 1021, and a second pull-down circuit 1022. The first connection circuit is connected between a first designated pin of the optical port 101 and the first control circuit; the second pull-up circuit 1021 is connected between the constant voltage power supply and the first connection circuit, and is used for limiting the current of the first connection circuit; the second pull-down circuit 1022 is connected between the first connection circuit of the optical port 101 and the ground, and is used for dividing the voltage provided by the constant power supply.
The second pull-up circuit 1021 may be formed of one or more resistors, such as R8 shown in fig. 5, and the second pull-up circuit 1021 provides a pull-up signal to the first connection circuit and limits the current flowing into the first connection circuit, i.e., limits the current flowing into the first control circuit 105, preventing the chip connected to the first designated pin in the first control circuit 105 from being damaged. The structure of the specific second pull-up circuit 1021 is not particularly limited.
The second pull-down circuit 1022 may be comprised of one or more resistors, such as R7 shown in fig. 5. The second pull-down circuit 1022 provides a pull-down signal to the first connection circuit to divide the voltage provided by the constant power supply. In this embodiment, the resistance value provided by the second pull-down circuit 1022 is greater than the first preset threshold value, so as to avoid the problem that the second pull-down circuit 1022 cannot perform voltage division, so that the signal of the first designated pin is directly output to the ground by the second pull-down circuit 1022, and further, the signal cannot be transmitted to the first control circuit 105, and in-place detection cannot be completed. The resistance value provided by the second pull-down circuit 1022 is smaller than the second preset threshold value, so that the situation that the voltage of one end, connected with the first connection circuit, of the second pull-down circuit 1022 is too low due to the fact that the second pull-down circuit 1022 plays a role in voltage division is avoided, interference cannot be transmitted into the ground through the second pull-down circuit 1022, and therefore signal quality of the first designated pin is poor is avoided.
When no optical module is connected to the optical port 101, the voltage of the constant voltage power supply is transmitted to the first control circuit through the second pull-up circuit because the first designated pin is in a suspended state, and the voltage detected by the first control circuit 105 is in a high level, and when the optical module is connected to the optical port 101, the voltage detected by the first control circuit 105 is pulled down because the first designated pin in the optical module is a grounding end and the second pull-up circuit passes through the first connecting circuit node, the voltage detected by the first control circuit 105 is in a low level, so that the first control circuit 105 can determine whether the optical module is connected according to the high and low levels of the detected in-place detection circuit. In addition, whether or not the optical module is connected, the second pull-up circuit can limit the current flowing into the first control circuit 105, so that the first control circuit 105 is prevented from being damaged due to overlarge current.
The third type of pins are pins defined as pins that transmit IIC (Inter Integrated Circuit, inter-integrated circuit) signals, such as pin 4 and pin 5 in table 1 above. One end of the discrimination circuit 107 is connected to the third type pin of the optical port 101, and the other end of the discrimination circuit 107 is connected to the first control circuit 105. When an optical module is connected to the optical port 101, the third type pin transmits an IIC signal to the first control circuit 105 through the discrimination circuit 107. The first control circuit 105 determines the type of the optical module from the IIC signal, and outputs a control signal or the like corresponding to the type of the optical module.
In the embodiment of the present application, the voltage dividing circuit 108 is divided into two parts, namely a first pull-up circuit 1081 and a first pull-down circuit 1082, as shown in fig. 3. One end of the first pull-up circuit is connected to a constant power supply, such as a 3V3 power supply shown in fig. 3, and the other end of the first pull-up circuit is connected to the first switching circuit 103. One end of the first pull-down circuit 1082 is grounded, as shown in GND of fig. 2, and the other end is connected to the first switching circuit 103 for dividing the voltage supplied from the constant power supply.
The first pull-up circuit 1081 may be comprised of one or more resistors, such as R2, R4, R6, R9, and R10 shown in FIG. 2. The first pull-up circuit 1081 provides a pull-up signal to the first switch circuit 103 and limits the current flowing into the first switch circuit 103, i.e., the first control circuit 105, to prevent the chip connected to the first type pin in the first control circuit 105 from being damaged. The structure of the specific first switch circuit 103 is not particularly limited.
The first pull-down circuit 1082 may be comprised of one or more resistors, such as R1, R3, R5, R11, and R12 shown in FIG. 2. The first pull-down circuit 1082 provides a pull-down signal to the first switching circuit 103 to divide the voltage provided by the constant power supply.
In this embodiment, the resistance provided by the first pull-down circuit 1082 is greater than the first preset threshold value, so as to avoid the problem that the first pull-down circuit 1082 cannot perform the voltage division function, so that the first type of pin signals are directly output to the ground by the first pull-down circuit 1082, and the signals cannot be transmitted to the first control circuit 105. The resistance value provided by the first pull-down circuit 1082 is smaller than the second preset threshold value, so as to avoid that the voltage of the end, connected with the first switch circuit 103, of the first pull-down circuit 1082 is too low due to the fact that the voltage of the end, connected with the first switch circuit 103, of the first pull-down circuit 1082 is too large, interference cannot be transmitted into the ground through the first pull-down circuit 1082, and therefore signal quality of the first type of pins is poor.
To ensure the transmission and quality of the signals of the first type of pins, the smaller and better the resistance provided by the first pull-down circuit 1082, to ensure that more interference can be introduced into ground through the first pull-down circuit 1082. The magnitude of the resistance provided by the first pull-down circuit 1082 is not particularly limited, as long as it is ensured that the voltage value at the end of the first pull-up circuit 1081 connected to the first switch circuit 103 after the voltage division by the first pull-down circuit 1082 is greater than the control signal high-low level threshold specified in the specification of the optical module.
Different types of optical modules have different high and low level thresholds of the control signal, for example, the high and low level threshold of the control signal of the CSFP optical module is 2V. The specific control signal high-low level threshold can be determined according to the maximum control signal high-low level threshold in the optical module compatible with the network equipment.
In this embodiment, the first switch circuit 103 includes a plurality of connection circuits, and each pin belonging to the first type of pins is connected to the first control circuit 105 through one connection circuit. In order to obtain better reliability of signal quality, one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with each connecting circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with each connecting circuit. As shown in fig. 2 and 3, the first switch circuit 103 includes connection circuits between pin 2, pin 3, pin 8, pin 14, and pin 17, respectively, and the CPLD, and these connection circuits are connected to one voltage dividing circuit, respectively.
In order to reduce the cost, the voltage dividing circuit may be connected to only a part of the connection circuit included in the first switch circuit 103. For example, the first type of pins includes a second designated pin, pins adjacent to the second designated pin include pins defined to transmit high-speed signals, and the first switching circuit includes a second connection circuit connected between the second designated pin and the first control circuit; one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the second connecting circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the second connecting circuit.
The second designated pin may be referred to as pin 8, pin 14 and pin 17 in fig. 2, the adjacent ones of which may be defined as transmitting high speed signals, i.e., where there is a large disturbance; while at other pins of the first type than the second designated pin, such as pin 2, pin 3, there is less interference and is negligible. In the embodiment of the application, the voltage dividing circuit is only arranged on the second connecting circuit, so that the reliability of signals is ensured, and meanwhile, the equipment cost is reduced.
In this embodiment of the present application, in order to further improve signal reliability, the first pull-up circuit and the second connection circuit are connected at a first connection point, and a distance between the first connection point and the second designated pin is smaller than a second preset distance. The second preset distance may be set according to actual requirements, for example, the second preset distance may be 1mm, 2mm, or the like.
In an embodiment of the application, the first pull-up circuit may be disposed on a PCB (Printed Circuit Board ). To reduce the impact of the first pull-up circuit, the first pull-up circuit may also be integrated into an optical module that requires a pull-up signal at the second designated pin. For example, the CSFP optical module needs pull-up signals at pins 14 and 17, and R4 and R6 in the first pull-up circuit at pins 14 and 17 can be integrated into the CSFP optical module, so that when the SFP/SFP+ optical module is connected to optical port 101, the influence of R4 and R6 in the first pull-up circuit can be avoided.
In some embodiments, to further improve signal reliability, the first control circuit may operate the first switching circuit based on the bit detection circuit and the discrimination circuit to further exclude interference. For example, the first control circuit 105 may specifically be configured to:
when the in-place detection circuit detects that the optical module is connected with the optical port, and the discrimination circuit determines a first type optical module of the optical module, the second connection circuit is connected with one end of the first control circuit to be grounded, and the first type optical module defines a second designated pin to be grounded or transmits a low-speed signal;
when the in-place detection circuit detects that the optical module is connected with the optical port, and the discrimination circuit determines a second type optical module of the optical module, a path between one end of the second connection circuit connected with the first control circuit and the ground is cut off, and the second type optical module defines a second designated pin to transmit a low-speed signal.
In this embodiment of the present application, the first type optical module may be a single-channel optical module, such as an SFP optical module, an sfp+ optical module, etc., and the second type optical module may be a dual-channel optical module, such as a CSFP optical module, a csfp+ optical module, etc. The second designated pin may be one or more. For the second designated pin defined as ground by the first type optical module, such as the pin 14 and the pin 17, when the first control circuit determines that the first type optical module is connected to the optical port by the in-place detection circuit and the discrimination circuit, the second connection circuit is connected to the ground of one end of the first control circuit 105, that is, the pin 14 and the pin 17 are grounded, which further improves the reliability of signal transmission; for the second designated pin defined by the first type optical module to transmit the low-speed signal, such as the pin 14 and the pin 17 described above, when the first control circuit determines that the second type optical module is connected to the optical port by the in-place detection circuit and the discrimination circuit, the path of the second connection circuit between one end of the first control circuit 105 and the ground is cut off, that is, the pin 14 and the pin 17 are communicated with the first control circuit 105 so that it can normally transmit the low-speed signal.
In the technical scheme provided by the embodiment of the application, the access of the optical module and the judgment of the type of the optical module are finished through the in-situ detection circuit and the judgment circuit, so that the accurate processing of signals of different types of optical modules is finished. The network equipment is compatible with different types of optical modules, and meanwhile, the reliability of signal transmission is improved.
In some embodiments, as shown in fig. 6a and 6b, the second connection circuit may include a first connection sub-circuit 601, a second connection sub-circuit 602, a third connection sub-circuit 603, and a switch 604, the first connection sub-circuit 601 being connected between the second designated pin and the switch 604, the second connection sub-circuit 602 and the third connection sub-circuit 603 being connected between the switch 604 and the first control circuit 105, respectively;
the first control circuit 105 is specifically configured to:
when the in-situ detection circuit detects that an optical module is connected to the optical port 101 and the discrimination circuit 107 determines that a first type optical module of the optical module is connected to the optical port, a first signal is transmitted to the switch 604 through a third connection sub-circuit, and the first type optical module defines a second designated pin to be grounded; when the in-place detection circuit detects that an optical module is connected to the optical port 101 and the second type optical module of the optical module is determined by the discrimination circuit 107, a second signal is transmitted to the change-over switch through the third connection sub-circuit 603, and the second type optical module defines a second designated pin to transmit a low-speed signal;
A switch 604 for cutting off a path between the first connection sub-circuit 601 and the second connection sub-circuit 602 according to the first signal and grounding the first connection sub-circuit 601; the path between the first connection sub-circuit 601 and the second connection sub-circuit 602 is communicated according to the second signal.
In this embodiment, a switch that can be controlled by the first control circuit 105 is disposed on the second connection circuit, and the switch can control whether the second designated pin is grounded. The first control circuit can detect that an optical module is connected to the optical port 101 through the in-situ detection circuit, and detect the type of the optical module through the discrimination circuit. If the accessed optical module is determined to be the first type optical module, a first signal can be transmitted to the change-over switch through a third connection sub-circuit, so that a second designated pin connected with the second connection circuit is grounded; if the accessed optical module is determined to be the second type optical module, the second signal can be transmitted to the change-over switch through the third connection sub-circuit, so that the second connection circuit can transmit the low-speed signal to the first control circuit 105.
In this embodiment, the distance between the switch and the optical port 101 may be set to be smaller than the first preset distance. For example, the distance between the switch and the optical port may be set to be smaller than 1mm, so that when the first type optical module (such as SFP/sfp+optical module) is inserted, the adverse effect of the voltage dividing circuit on the signal sent by the optical module may be reduced. In addition, if the switch can be deployed inside the CSFP optical module, adverse effects of the switch on signals sent by the optical module can be avoided to the greatest extent.
In this embodiment of the present application, for pins that do not belong to the first type of pins, the second type of pins, the third type of pins, the first specified pins, the second specified pins, such as pin 11, pin 15, pin 16, and pin 20, the deployment of the pins of the optical module in the related art may be adopted, as shown in fig. 2, where pin 11 and pin 20 are grounded, and pin 15 and pin 16 are connected to a constant power supply.
Based on the same inventive concept, the embodiment of the present application provides a method for controlling optical module access, which is applied to any network device as described above, referring to fig. 7, and the method includes:
step S701, detecting whether an optical module is accessed or not through an in-place detection circuit;
step S702, if the optical module is detected to be accessed, determining the type of the accessed optical module through a judging circuit;
step S703, according to the type of the optical module, processes the signal sent by the optical module.
In the technical scheme provided by the embodiment of the application, the in-place detection circuit and the discrimination circuit are deployed in the network equipment so as to finish the access of the optical module and the judgment of the type of the optical module through different pins, and further finish the accurate processing of the signals of the optical modules of different types. The method realizes that the network equipment is compatible with different types of optical modules at the same time, improves the application flexibility of the network equipment, reduces the cost of the network equipment and expands the application range of the network equipment. In addition, a voltage dividing circuit is also arranged in the network equipment, and based on a first pull-up circuit and a first pull-down circuit which are included in the voltage dividing circuit, the current of the first switching circuit can be limited, the voltage provided by a constant power supply is divided, the voltage of one end of the first pull-up circuit connected with the first switching circuit is ensured, and the reliability of signal transmission is improved; in addition, through the first pull-down circuit, partial interference can be transmitted into the ground, so that the adverse effect of the interference on the signal transmitted by the optical module is reduced, and the reliability of signal transmission is further improved. Therefore, in the embodiment of the application, the network equipment is compatible with different types of optical modules, and meanwhile, the reliability of signal transmission is improved.
In some embodiments, the first type of pins may include a second designated pin, adjacent pins to the second designated pin including pins defined to transmit high speed signals; the first switching circuit may include a second connection circuit connected between the second designated pin and the first control circuit; one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the second connecting circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the second connecting circuit;
the above method for controlling the access of the optical module may further include:
when the first type optical module of the optical module is connected with one end of the first control circuit to be grounded, the first type optical module defines a second designated pin to be grounded;
when the second type optical module of the optical module is used, the path between one end of the second connection circuit connected with the first control circuit and the ground is cut off, and the second type optical module defines a second designated pin to transmit a low-speed signal.
In some embodiments, the first type of pins may include a second designated pin, adjacent pins to the second designated pin including pins defined to transmit high speed signals; the first switching circuit may include a second connection circuit connected between the second designated pin and the first control circuit; one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the second connecting circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the second connecting circuit;
The second connection circuit may include a first connection sub-circuit, a second connection sub-circuit, a third connection sub-circuit, and a switch, the first connection sub-circuit being connected between the second designated pin and the switch, the second connection sub-circuit and the third connection sub-circuit being connected between the switch and the first control circuit, respectively;
the above method for controlling the access of the optical module may further include:
when the first type optical module of the optical module is used, the switching switch is controlled to cut off a passage between the first connection sub-circuit and the second connection sub-circuit through the third connection sub-circuit, the first connection sub-circuit is grounded, and the first type optical module defines a second designated pin to be grounded;
when the second type optical module of the optical module is used, the switching switch is controlled to be communicated with a passage between the first connection sub-circuit and the second connection sub-circuit through the third connection sub-circuit, and the second type optical module defines a second designated pin to transmit a low-speed signal.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the method embodiments, since they are substantially similar to the network device embodiments, the description is relatively simple, and reference is made to the partial description of the network device embodiments for relevant points.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modifications, equivalent substitutions, improvements, etc. that are within the spirit and principles of the present application are intended to be included within the scope of the present application.
Claims (11)
1. The network equipment is characterized by comprising an optical port, an in-place detection circuit, a first switching circuit, a second switching circuit, a first control circuit, a second control circuit, a judging circuit and a voltage dividing circuit;
the first switching circuit is connected between a first type of pin of the optical port and the first control circuit, the second switching circuit is connected between a second type of pin of the optical port and the second control circuit, the first type of pin is defined as a pin which is grounded or transmits low-speed signals, and the second type of pin is defined as a pin which is grounded or transmits high-speed signals or transmits low-speed signals; the first control circuit and the second control circuit are used for processing received signals;
the in-place detection circuit is connected between a first designated pin of the optical port and the first control circuit and is used for detecting whether an optical module is connected to the optical port or not, and the first designated pin is defined as a grounded pin;
The judging circuit is connected between a third type of pins of the optical port and the first control circuit and is used for detecting the type of an optical module connected to the optical port, and the third type of pins are defined as pins for transmitting IIC signals;
the voltage dividing circuit comprises a first pull-up circuit and a first pull-down circuit; one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the first switching circuit and used for limiting the current of the first switching circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the first switching circuit and is used for dividing the voltage provided by the constant power supply.
2. The network device of claim 1, wherein the bit detection circuit comprises a first connection circuit, a second pull-up circuit, and a second pull-down circuit;
the first connection circuit is connected between a first designated pin of the optical port and the first control circuit;
the second pull-up circuit is connected between the constant voltage power supply and the first connecting circuit and used for limiting the current of the first connecting circuit;
the second pull-down circuit is connected between the first connection circuit of the optical port and the ground and is used for dividing the voltage provided by the constant power supply.
3. The network device of claim 1 or 2, wherein the pin adjacent to the first designated pin is a pin defined to transmit a low speed signal or ground.
4. The network device of claim 1, wherein the first type of pins comprises a second designated pin, and wherein pins adjacent to the second designated pin comprise pins defined to transmit high speed signals;
the first switching circuit comprises a second connection circuit connected between the second designated pin and the first control circuit;
one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the second connecting circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the second connection circuit.
5. The network device of claim 4, wherein the first control circuit is specifically configured to:
when the in-place detection circuit detects that an optical module is connected to the optical port, and the discrimination circuit determines a first type optical module of the optical module, the second connection circuit is connected with one end of the first control circuit to be grounded, and the first type optical module defines the second designated pin to be grounded;
When the in-place detection circuit detects that an optical module is connected to the optical port, and the discrimination circuit determines a second type optical module of the optical module, a path between one end of the second connection circuit connected with the first control circuit and the ground is cut off, and the second type optical module defines the second designated pin to transmit a low-speed signal.
6. The network device of claim 4, wherein the second connection circuit comprises a first connection sub-circuit, a second connection sub-circuit, a third connection sub-circuit, and a switch, the first connection sub-circuit being connected between the second designated pin and the switch, the second connection sub-circuit and the third connection sub-circuit being connected between the switch and the first control circuit, respectively;
the first control circuit is specifically configured to:
when the in-place detection circuit detects that an optical module is connected to the optical port, and the discrimination circuit determines a first type optical module of the optical module, a first signal is transmitted to the change-over switch through the third connection sub-circuit, and the first type optical module defines that the second designated pin is grounded; when the in-place detection circuit detects that an optical module is connected to the optical port and the discrimination circuit determines a second type optical module of the optical module, a second signal is transmitted to the change-over switch through the third connection sub-circuit, and the second type optical module defines the second designated pin to transmit a low-speed signal;
The switch is used for cutting off a passage between the first connection sub-circuit and the second connection sub-circuit according to the first signal and grounding the first connection sub-circuit; and communicating a path between the first connection sub-circuit and the second connection sub-circuit according to the second signal.
7. The network device of claim 6, wherein a distance between the switch and the optical port is less than a first preset distance.
8. The network device of any of claims 4-7, wherein the first pull-up circuit and the second connection circuit are connected at a first connection point, a distance between the first connection point and the second designated pin being less than a second preset distance;
the distance between the first control circuit and the light port is smaller than a third preset distance.
9. A method for controlling access to an optical module, applied to the network device of any one of claims 1-8, the method comprising:
detecting whether an optical module is accessed or not through an in-place detection circuit;
if the optical module is detected to be accessed, determining the type of accessing the optical module through the judging circuit;
And processing signals sent by the optical module according to the type of the optical module.
10. The method of claim 9, wherein the first type of pins comprises a second designated pin, and wherein pins adjacent to the second designated pin comprise pins defined to transmit high speed signals; the first switching circuit comprises a second connection circuit connected between the second designated pin and the first control circuit; one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the second connecting circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the second connecting circuit;
the method further comprises the steps of:
when a first type optical module of the optical module is used, the second connecting circuit is connected with one end of the first control circuit to be grounded, and the first type optical module defines the second designated pin to be grounded;
and when the second type optical module of the optical module is used, a path between one end of the second connection circuit connected with the first control circuit and the ground is cut off, and the second type optical module defines the second designated pin to transmit a low-speed signal.
11. The method of claim 9, wherein the first type of pins comprises a second designated pin, and wherein pins adjacent to the second designated pin comprise pins defined to transmit high speed signals; the first switching circuit comprises a second connection circuit connected between the second designated pin and the first control circuit; one end of the first pull-up circuit is connected with a constant power supply, and the other end of the first pull-up circuit is connected with the second connecting circuit; one end of the first pull-down circuit is grounded, and the other end of the first pull-down circuit is connected with the second connecting circuit;
the second connection circuit comprises a first connection sub-circuit, a second connection sub-circuit, a third connection sub-circuit and a change-over switch, wherein the first connection sub-circuit is connected between the second designated pin and the change-over switch, and the second connection sub-circuit and the third connection sub-circuit are respectively connected between the change-over switch and the first control circuit;
the method further comprises the steps of:
when a first type optical module of the optical module is used, the third connection sub-circuit is used for controlling the change-over switch to cut off a passage between the first connection sub-circuit and the second connection sub-circuit and grounding the first connection sub-circuit, and the first type optical module defines that the second designated pin is grounded;
And when the second type optical module of the optical module is used, the third connection sub-circuit is used for controlling the switch to be communicated with a passage between the first connection sub-circuit and the second connection sub-circuit, and the second type optical module defines the second designated pin to transmit a low-speed signal.
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