CN109814212B - QSFP28 to SFP28 port and downward compatible QSFP+ to SFP+ port switching device and circuit - Google Patents
QSFP28 to SFP28 port and downward compatible QSFP+ to SFP+ port switching device and circuit Download PDFInfo
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- CN109814212B CN109814212B CN201910100248.8A CN201910100248A CN109814212B CN 109814212 B CN109814212 B CN 109814212B CN 201910100248 A CN201910100248 A CN 201910100248A CN 109814212 B CN109814212 B CN 109814212B
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Abstract
The invention relates to a QSFP 28-SFP 28 port switching device and a circuit which are downwards compatible with QSFP+ to SFP+ port switching device, comprising an unlocking device and a shell consisting of a bottom shell and an upper cover, wherein electronic equipment is fixed between the bottom shell and the upper cover and is used for being electrically connected with an SFP28 module inserted into a hollow inner cavity of the switching device from the tail end, and a locking sheet metal part is clamped on the tail part of the upper cover; the outer wall of the shell is provided with a chute for accommodating the unlocking device, the unlocking device is in sliding fit and limited in the chute arranged on the outer wall of the shell, the side wall of the unlocking device is provided with an unlocking part for enabling the corresponding QSFP28 cage elastic sheet to separate from the port switching equipment to bounce, and the bottom shell is provided with a spring for providing resetting force for the unlocking device. The port switching equipment leads out one path of signal for the SFP28 module to communicate on the QSFP28 switch, and the other three paths of signal shielding, so that the single channel signal of the QSFP28 and the SFP28 are switched, and meanwhile, the conversion from the QSFP28 to the SFP28 and the conversion from the downward compatible QSFP+ to the SFP+ can be realized.
Description
Technical Field
The invention relates to the field of optical modules in optical communication, in particular to a QSFP 28-SFP 28 port and downward compatible QSFP+ -SFP+ port switching device and circuit.
Background
At present, four-way communication is often performed for high-speed QSFP28 or QSFP+ traffic, but single-way communication is also performed, and the high-speed QSFP28 or QSFP+ traffic is conventionally split by an optical splitter or DEMUX, so that the operation is very complex and high in cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a port for QSFP28 to SFP28, a QSFP+ to SFP+ port switching device and a circuit on a switch, wherein the switch can directly realize the conversion of a communication single-way signal between the QSFP28 and the SFP28 through the port switching device, and simultaneously realize the downward compatible communication conversion between QSFP+ and SFP+.
The invention is realized in the following way: the invention provides a QSFP 28-SFP 28 port switching device which is downwards compatible with QSFP+ to SFP+ port switching equipment, comprising an unlocking device and a shell body composed of a bottom shell and an upper cover, wherein the bottom shell is fixedly connected with the upper cover; the outer wall of casing is equipped with the spout that is used for holding unlocking device, unlocking device sliding fit and spacing in the spout that the casing outer wall was equipped with, unlocking device's lateral wall is equipped with the unblock portion that is used for making corresponding QSFP28/QSFP+ cage shell fragment break away from port switching equipment and bounce, install the spring on the drain pan for provide the power that resets for unlocking device. The unlocking device is provided with a bottom shell and an upper cover which are blocked up and down, and limit grooves are respectively arranged on the left side and the right side of the bottom shell and the upper cover.
The unlocking device comprises a front end part and a rear end part which are connected with each other, wherein the front end part is provided with two parallel side plates and a bottom plate fixed between the two parallel side plates, the left side plate and the right side plate of the front end part of the unlocking device are provided with an upper bulge which extends upwards and a lower bulge which extends downwards, the bottom plate is provided with a limit groove corresponding to the lower bulge of the left side plate and the right side plate of the unlocking device, the upper cover is provided with a limit groove corresponding to the upper bulge of the left side plate and the right side plate of the unlocking device, the lower bulge of the left side plate and the right side plate of the unlocking device extends into the limit groove corresponding to the bottom plate, and the upper bulge of the left side plate and the right side plate of the front end part of the unlocking device extends into the limit groove corresponding to the upper cover, so that the unlocking device has a certain degree of freedom in the direction of inserting and separating the SFP28 module from the switching equipment; the left side plate end and the right side plate end of the front end of the unlocking device are provided with outward bending parts to form unlocking parts for enabling corresponding QSFP28 cage spring plates to separate from port switching equipment to spring; the bottom plate of unlocking device front end is equipped with the spring separation blade that upwards extends, the spring separation blade on the bottom plate of unlocking device front end stretches into in the spring mounting groove of bottom plate under the bottom plate, contacts with spring one end in the spring mounting groove, makes the spring provide the power that resets for unlocking device.
The left side plate and the right side plate of the front end part of the unlocking device are respectively contacted with the left outer wall and the right outer wall of the bottom shell correspondingly and are limited in the sliding grooves of the outer walls at the two sides of the shell.
The rear end part of the unlocking device is provided with a U-shaped handle, and the handle is fixedly connected with the left side plate and the right side plate of the front end part of the unlocking device; the two ends of the U-shaped handle are respectively provided with a connecting plate, the end faces of the two connecting plates are provided with slots, and the left side plate and the right side plate of the front end part of the unlocking device are respectively inserted into the slots of the two connecting plates of the two ends of the U-shaped handle to be fixed.
The length of the bottom plate at the front end part of the unlocking device is smaller than that of the side plate. The front ends of two parallel side plates at the front end part of the unlocking device are provided with outward bending parts for unlocking. The front end part of the unlocking device can be made of stainless steel materials, and the rear end part of the unlocking device can be made of nylon materials. The rear end of the unlocking device is formed on the front end of the unlocking device.
The bottom shell and the upper cover can be made of zinc alloy materials. The latch sheet metal part can be made of stainless steel materials.
The cross section of hasp sheet metal component is U type, the outer wall is equipped with the joint boss about the upper cover afterbody, the lateral wall is equipped with the bayonet socket about the hasp sheet metal component for with the joint boss joint cooperation that the upper cover afterbody was equipped with.
The bottom shell is clamped with the tail end of the upper cover, and the bottom shell is fixedly connected with the head end of the upper cover through bolts; the heads of the bottom shell and the upper cover are respectively provided with corresponding bolt mounting holes.
The electronic equipment comprises a PCB and a special mini connector, wherein the PCB comprises a golden finger part, a report signal conversion circuit and a communication signal conversion circuit; mini connectors are designed with heights below a typical value. The PCB and the SFP28 module inserted into the switching equipment are respectively inserted into two ends of the connector to form electric connection.
The QSFP28 switching equipment designed by the invention can enable the conventional SFP28 module to normally carry out single-way switching communication on the QSFP28 switch, and can enable the SFP+ module to be used on the QSFP+ switch.
The invention provides a port switching circuit for switching QSFP28 to SFP28 and enabling QSFP+ to be downwards compatible with the SFP+ port switching circuit, which comprises an SFP28 interface and a four-channel QSFP28 interface, wherein receiving ports Rxp and Rxn of one channel in the four-channel QSFP28 interface are connected with receiving ports RD+, RD-of the SFP28 interface, transmitting ports TD+ and TD-of the SFP28 interface are connected with transmitting ports Txp and Txn of a corresponding one channel in the four-channel QSFP28 interface, so that one channel in the four-channel QSFP28 interface and the SFP28 interface perform signal transmission, the switching of QSFP28 function to SFP28 function and the switching of the four-channel QSFP28 interface are simultaneously downwards compatible with the QSFP+ are achieved, and receiving ports of the other three channels in the four-channel QSFP28 interface do not perform signal transmission, and transmitting ports of the other three channels in the four-channel QSFP28 interface do not perform signal transmission.
The port switching equipment for the QSFP28 to the SFP28 is used on a 100G switch through circuit design, three paths in four paths are shielded (the shielded three paths cannot transmit signals), and one path and the SFP28 module transmit signals, so that the switching function is achieved. Through each PIN PIN of the chip, the transfer from the QSFP28 function to the SFP28 function is realized, and the transfer from QSFP+ to SFP+ is compatible downwards.
The reporting signal conversion circuit is arranged between the SFP28 interface and the four-way QSFP28 interface and is used for converting related DOM reporting signals, and the conversion circuit adopts a logic gate chip and an MOS tube with shorter response time, so that the signal conversion is more timely. The Tx_FAult pin and the Rx_LOS pin of the SFP28 interface are connected with the INTL pin of the four-channel QSFP28 interface through an OR gate chip, and when any one of the Tx_FAULT signal and the Rx_LOS signal is at a high level, the INTL signal is set high to realize the conversion of interrupt signals; the RESETL pin of the four-channel QSFP28 interface is connected with the TX_DISABLE pin of the SFP28 interface through a first NOT chip to realize level conversion; the LPMODE pin of the four-channel QSFP28 interface is connected with the RS0 pin of the SFP28 interface through a second NOT gate chip to realize level conversion; the LPMODE pin of four-channel QSFP28 interface is connected with the RS1 pin of SFP28 interface through the MOS pipe, the grid of MOS pipe is connected with the LPMODE pin of four-channel QSFP28 interface, the source ground of MOS pipe, the drain electrode of MOS pipe is connected with the RS1 pin of SFP28 interface, one end of resistance R18 respectively, and 3.3V voltage is connected to the other end of resistance R18.
A communication signal conversion circuit is arranged between the SFP28 interface and the four-way QSFP28 interface, the communication signal conversion circuit comprises an I2C module, an SCL pin and an SDA pin of the four-way QSFP28 interface and the SCL pin and the SDA pin of the SFP28 interface are respectively connected with pins corresponding to the I2C module, so that I2C communication conversion is realized; the ModSelL pin of the four-channel QSFP28 interface is connected with the enabling signal end of the I2C module, so that the ModSelL signal is used as an enabling signal, and when the ModSelL signal is set to be 1, the I2C signal can only pass through.
The conversion device provided by the invention can be compatible with port conversion from QSFP+ to SFP+ at a low speed. The chips U1 and U2 of the conversion equipment can read EEPROM information of A0H table byte 12 defined by SFF-8472 protocol in the SFP28/SFP+ module from I2C communication to obtain the transmission rate of the module, thereby automatically identifying whether the inserted module model is SFP28 or SFP+, and converting in SFP28 mode if the signal is in a high-rate mode of 25 GB/s; if the signal is in a low rate mode of 10GB/s, the signal is converted in SFP+ mode.
The resistors are connected between the positive and negative receiving ports of the remaining three channels of the four-channel QSFP28 interface, so that the receiving ports of the remaining three channels in the four-channel QSFP28 interface do not transmit signals, and the resistors are connected between the positive and negative transmitting ports of the remaining three channels of the four-channel QSFP28 interface, so that the transmitting ports of the remaining three channels in the four-channel QSFP28 interface do not transmit signals.
Compared with the prior art, the invention has the following beneficial effects:
by adopting the port switching equipment, the port part meets the requirements of QSFP+ and QSFP28 protocols and can be connected with a switch; the internal port connection can be used as SFP28 and SFP+; the locking sheet metal part is easy to assemble; in the switching device, when the SFP28/SFP+ needs to be unlocked, enough space is reserved at the corresponding SFP28/SFP+ pull ring, so that the collision between a finger and the pull ring 81 of the SFP28/SFP+ inserted into the switching device during unlocking is avoided, and therefore, the unlocking device needs to reserve enough space at the unlocking operation position, and the finger has the least pressing sense when the SFP28 and the SFP+ are unlocked.
The port switching equipment enables the SFP28 to be switched normally on the 100G switch interface; meanwhile, the converted module information can be read through I2C, so that the transmission rate is automatically adapted, the optical module switched from QSFP+ to SFP+ can be downward compatible and used normally, and the annual cost is saved in 200 ten thousand Yuan people's bank notes.
Through the circuit design of this patent, make QSFP28 switch draw one way above QSFP28 switch and supply SFP28 module to communicate, three way in addition carry out signal shielding to reach QSFP28 single channel signal and SFP28 switching, this design has good compatibility, can realize QSFP28 to SFP 28's conversion and QSFP+ to SFP+ conversion simultaneously, make conventional SFP28 module can normally carry out the single-way switching on QSFP28 switch and communicate the use, simultaneously downward compatible QSFP+ to SFP+ switching.
Drawings
Fig. 1 is a schematic diagram of the external appearance of a port switching device for QSFP28 to SFP28 according to the present invention;
fig. 2 is a schematic diagram illustrating the internal structure of the port switching device for QSFP28 to SFP28 according to the present invention;
fig. 3 is a schematic structural diagram of a bottom case of the port switching device for QSFP28 to SFP28 according to the present invention;
FIG. 4 is a schematic view of the structure of the upper cover, latch plate of the port adapter apparatus for QSFP28 to SFP28 of the present invention;
FIG. 5 is a schematic diagram of the installation of the upper cover, latch plate of the port adapter apparatus for QSFP28 to SFP28 of the present invention;
fig. 6 is a schematic structural diagram of an unlocking apparatus for a port switching device from a QSFP28 to an SFP28 according to the present invention;
fig. 7 is a schematic diagram of the configuration of the electronic device of the port switching device for QSFP28 to SFP28 according to the present invention;
FIG. 8 is a schematic diagram of the bottom surface structure of a port adapter device equipped with an SFP28 module in accordance with the present invention;
FIG. 9 is a schematic diagram of the upper structure of a port adapter device equipped with an SFP28 module in accordance with the present invention;
FIG. 10 is a schematic diagram of the structure of the SFP28 module of the present invention;
FIG. 11 is a schematic rear view of the SFP28 module of FIG. 10;
FIG. 12 is a schematic diagram of a golden finger portion of a QSFP 28-to-SFP 28 and downward compatible QSFP+to SFP+switch device;
FIG. 13 is a circuit diagram of a report signal conversion circuit according to the present invention;
fig. 14 is a circuit diagram of a communication signal conversion circuit according to the present invention.
In the drawing, 1 is a bottom shell, 1-1 is a spring mounting groove, 2 is an upper cover, 2-1 is a clamping boss, 2-2 is a limiting groove of the upper cover, 3 is a locking sheet metal part, 3-1 is a bayonet, 3-2 is an elastic sheet, 4 is an unlocking device, 4-1 is an upper bulge, 4-2 is a lower bulge, 4-3 is an unlocking part, 4-4 is a spring blocking piece, 4-5 is a U-shaped rod, 5 is a spring, 6 is a PCB (printed circuit board), 7 is a connector, 8 is an SFP28 module, and 81 is a pull ring.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 11, the invention provides a port switching device for QSFP28 to SFP28 and downward compatibility qsfp+ to sfp+ port switching device, comprising an unlocking device and a shell composed of a bottom shell and an upper cover, wherein the bottom shell is fixedly connected with the upper cover, a hollow cavity for installing electronic equipment and an external SFP28 module is formed between the bottom shell and the upper cover, the electronic equipment is fixed between the bottom shell and the upper cover and is used for being electrically connected with the SFP28/sfp+ module inserted into the hollow cavity of the switching device from the tail end, and a locking sheet metal part is clamped on the tail part of the upper cover and is used for locking the SFP28/sfp+ module inserted into the switching device; the outer wall of casing is equipped with the spout that is used for holding unlocking device, unlocking device sliding fit and spacing in the spout that the casing outer wall was equipped with, unlocking device's lateral wall is equipped with the unblock portion that is used for making corresponding QSFP28/QSFP+ cage shell fragment break away from port switching equipment and bounce, install the spring on the drain pan for provide the power that resets for unlocking device.
The unlocking device comprises a front end part and a rear end part which are connected with each other, wherein the front end part is provided with two parallel side plates and a bottom plate fixed between the two parallel side plates, the left side plate and the right side plate of the front end part of the unlocking device are provided with an upper bulge which extends upwards and a lower bulge which extends downwards, the bottom plate is provided with a limit groove corresponding to the lower bulge of the left side plate and the right side plate of the unlocking device, the upper cover is provided with a limit groove corresponding to the upper bulge of the left side plate and the right side plate of the unlocking device, the lower bulge of the left side plate and the right side plate of the unlocking device extends into the limit groove corresponding to the bottom plate, and the upper bulge of the left side plate and the right side plate of the front end part of the unlocking device extends into the limit groove corresponding to the upper cover, so that the unlocking device has a certain degree of freedom in the direction of inserting and separating the SFP28 module from the switching equipment; the left side plate end and the right side plate end of the front end of the unlocking device are provided with outward bending parts to form unlocking parts for enabling corresponding QSFP28 cage spring plates to separate from port switching equipment to spring; the bottom plate of unlocking device front end is equipped with the spring separation blade that upwards extends, the spring separation blade on the bottom plate of unlocking device front end stretches into in the spring mounting groove of bottom plate under the bottom plate, contacts with spring one end in the spring mounting groove, makes the spring provide the power that resets for unlocking device.
The left side plate and the right side plate of the front end part of the unlocking device are respectively contacted with the left outer wall and the right outer wall of the bottom shell correspondingly and are limited in the sliding grooves of the outer walls at the two sides of the shell.
The rear end part of the unlocking device is provided with a U-shaped handle, and the handle is fixedly connected with the left side plate and the right side plate of the front end part of the unlocking device; the two ends of the U-shaped handle are respectively provided with a connecting plate, the end faces of the two connecting plates are provided with slots, and the left side plate and the right side plate of the front end part of the unlocking device are respectively inserted into the slots of the two connecting plates of the two ends of the U-shaped handle to be fixed.
The length of the bottom plate at the front end part of the unlocking device is smaller than that of the side plate. The front ends of two parallel side plates at the front end part of the unlocking device are provided with outward bending parts for unlocking. The front end part of the unlocking device can be made of stainless steel materials, and the rear end part of the unlocking device can be made of nylon materials. The rear end of the unlocking device is formed on the front end of the unlocking device.
In the switching device, when the SFP28/SFP+ needs to be unlocked, enough space is reserved at the corresponding SFP28/SFP+ pull ring, so that the collision between a finger and the pull ring 81 of the SFP28/SFP+ inserted into the switching device during unlocking is avoided, and therefore, the unlocking device needs to reserve enough space at the unlocking operation position, namely, a U-shaped middle space, and the finger has the least pressing sense during unlocking of the SFP28 and the SFP+.
The bottom shell and the upper cover can be made of zinc alloy materials. The latch sheet metal part can be made of stainless steel materials.
The cross section of hasp sheet metal component is U type, the outer wall is equipped with the joint boss about the upper cover afterbody, the lateral wall is equipped with the bayonet socket about the hasp sheet metal component for with the joint boss joint cooperation that the upper cover afterbody was equipped with. The latch sheet metal part is provided with an elastic sheet, and the elastic sheet is provided with a bayonet for being matched with a protrusion of the SFP28 module inserted into the switching equipment to lock the SFP28 module inserted into the switching equipment.
The bottom shell is clamped with the tail end of the upper cover, and the bottom shell is fixedly connected with the head end of the upper cover through bolts; the heads of the bottom shell and the upper cover are respectively provided with corresponding bolt mounting holes.
The electronic equipment comprises a PCB and a connector, wherein the PCB and the SFP28 module inserted into the switching equipment are respectively inserted into two ends of the connector to form electric connection.
In a specific implementation process, when the port switching device is connected with the external SFP28/SFP+ module, after the external SFP28/SFP+ module is inserted into the port switching device, the external SFP28/SFP+ module is automatically locked by the elastic sheet of the locking sheet metal part at the tail part of the port switching device through the unlocking piece. When unlocking, the SFP28/SFP+ module pull ring is pulled to rotate by 90 degrees, the unlocking key (with a spring to prop up) is pushed to have an oblique angle, the sheet metal lock catch on the converter is slowly jacked up, and the elastic sheet metal part of the lock catch is automatically tripped, so that the unlocking function is realized.
When the port switching device is connected with an external QSFP28 switch interface, and the port switching device is inserted into the switch (corresponding QSFP28 cage), the cage spring plate is buckled into the port switching device structure and is blocked. When the unlocking device of the port switching equipment is pulled during unlocking, the cage elastic sheet is separated from the adapter to bounce, and the unlocking function is realized.
The QSFP28 switching equipment designed by the invention can enable the conventional SFP28 module to normally carry out single-way switching communication use on the QSFP28 switch, and simultaneously, the QSFP+ to SFP+ switching equipment is downwards compatible.
Referring to fig. 12 to 14, the present invention provides a port switching circuit for switching from a QSFP28 to an SFP28 and for downward compatibility of qsfp+ to an sfp+ port, which includes an SFP28 interface (SFP 28 gold finger) and a four-channel QSFP28 interface (QSFP 28 gold finger), wherein the receiving ports Rx1p and Rx1n of a first channel in the four-channel QSFP28 interface are connected with the receiving ports rd+, RD-of the SFP28 interface, and the transmitting ports td+ and TD-of the SFP28 interface are connected with the transmitting ports Tx1p and Tx1n of the first channel in the four-channel QSFP28 interface, so that the first channel in the four-channel QSFP28 interface performs signal transmission with the SFP28 interface, the function of switching from the QSFP28 to the SFP28 interface is realized, and simultaneously downward compatibility of qsfp+ to the sfp+ is not performed, and the transmitting ports of the remaining three channels in the four-channel QSFP28 interface are not subjected to signal transmission. In the QSFP28 golden finger part, only one channel is selected, and the rest channels are connected by using a 100ohm resistor, which is equivalent to not being used. The rest control and indication signals are normally connected.
The positive and negative receiving ports of the other three channels of the four-channel QSFP28 interface are connected with resistors, so that the receiving ports of the other three channels of the four-channel QSFP28 interface do not transmit signals, and the positive and negative transmitting ports of the other three channels of the four-channel QSFP28 interface are connected with resistors, so that the transmitting ports of the other three channels of the four-channel QSFP28 interface do not transmit signals. The resistor of this embodiment may be a 100ohm resistor.
Since the high-speed signal is required to meet the transmission requirements of both the 4 x 25g and the 4 x 10g signals, there is a high design requirement. For those two high speed differential lines TD+/TD-leading out of QSFP 28; RD+/RD-, and in the design of the PCB, the two pairs of signal wires are far away from other devices as much as possible, so that the integrity of high-speed signals is better ensured, and the impedance matching precision is higher. The connector port is gold-plated, and the electrical performance of the port is more excellent.
According to the invention, through circuit design and the design of the switch and the driving circuit of the NMOS tube, the related reporting of the SFP28 and the DOM of the SFP+ can be compatible on the same circuit board, and the LOS, TX_FUALT and other information of the SFP28 can be read normally, and the LOS, TX_FUALT and other information of the SFP+ module of 10G can be read simultaneously.
The port switching equipment for the QSFP2828 to the SFP28 is used on the 100G switch through circuit design, three paths in four paths are shielded (the shielded three paths cannot transmit signals), and one path and the SFP28 module transmit signals, so that the switching function is achieved. Through each PIN PIN of the chip, the transfer from the QSFP28 function to the SFP28 function is realized, and the transfer from QSFP+ to SFP+ is compatible downwards.
The Tx_FAult pin and the Rx_LOS pin of the SFP28 interface are connected with the INTL pin of the four-channel QSFP28 interface through an OR gate chip, and when any one of the Tx_FAULT signal and the Rx_LOS signal is at a high level, the INTL signal is set high to realize the conversion of interrupt signals. The OR gate chip adopts 7432 chip, when any one of TX_FAULT and RX_LOS is high level, INTL signal is set high to realize the conversion of interrupt signal.
The RESETL pin of the four-channel QSFP28 interface is connected with the TX_DISABLE pin of the SFP28 interface through a first NOT chip to realize level conversion; the LPMODE pin of the four-channel QSFP28 interface is connected with the RS0 pin of the SFP28 interface through a second NOT gate chip to realize level conversion; the LPMODE pin of four-channel QSFP28 interface is connected with the RS1 pin of SFP28 interface through the MOS pipe, the grid of MOS pipe is connected with the LPMODE pin of four-channel QSFP28 interface, the source ground of MOS pipe, the drain electrode of MOS pipe is connected with the RS1 pin of SFP28 interface, one end of resistance R18 respectively, and 3.3V voltage is connected to the other end of resistance R18. The RESETL signal is converted to a TX DISABLE signal via an not gate. The LPMODE signal is converted into the RS0 signal through a NOT gate, and level transition is not needed when the LPMODE signal is converted into the RS1 signal, but in order to keep the time delay consistent, a MOS tube is adopted. This completes the conversion of the rate selection signal.
A communication signal conversion circuit is arranged between the SFP28 interface and the four-channel QSFP28 interface, the communication signal conversion circuit comprises an I2C module U1 and an I2C module U2, the used chips are ST24C02, a A, B pin of the I2C module U1 is correspondingly connected with an SCL pin of the four-channel QSFP28 interface and an SCL pin of the SFP28 interface respectively, and a A, B pin of the I2C module U2 is correspondingly connected with an SDA pin of the four-channel QSFP28 interface and an SDA pin of the SFP28 interface respectively to realize conversion of I2C communication; the ModSelL pin of the four-channel QSFP28 interface is connected with the enabling signal ends of the I2C module U1 and the I2C module U2, the ModSelL signal is used as an enabling signal, and when the ModSelL signal is set to be 1, the I2C signal can only pass through, and if not, the ModSelL signal can not pass through.
Since SFP28 and sfp+ follow the same protocol, it is possible for the Adapter to implement downward compatible functionality. As shown in fig. 14, the chips U1, U2 of the conversion device can read the EEPROM information of the A0H table byte 12 defined by the SFF-8472 protocol in the SFP28/sfp+ module from the I2C communication to obtain a specific value of the transmission rate of the module, thereby automatically identifying whether the inserted module model is SFP28 or sfp+. If the signal is in a high-speed mode of 25GB/s, converting in an SFP28 mode; if the signal is in a low rate mode of 10GB/s, the signal is converted in SFP+ mode.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. The QSFP 28-SFP 28 port switching device is characterized by comprising an unlocking device and a shell body composed of a bottom shell and an upper cover, wherein the bottom shell is fixedly connected with the upper cover, the electronic device is fixed between the bottom shell and the upper cover and is used for being electrically connected with an SFP28 module/SFP+ module inserted into a hollow inner cavity of the switching device from the tail end, and a locking sheet metal part is clamped on the tail part of the upper cover and is used for locking the SFP28 module/SFP+ module inserted into the switching device; the outer wall of the shell is provided with a chute for accommodating an unlocking device, the unlocking device is in sliding fit and limited in the chute arranged on the outer wall of the shell, the side wall of the unlocking device is provided with an unlocking part for enabling a corresponding QSFP28/QSFP+ cage elastic sheet to separate from port switching equipment to bounce, and the bottom shell is provided with a spring for providing resetting force for the unlocking device;
the PCB board and the SFP28 module/SFP+ inserted into the switching equipment are respectively inserted into two ends of the connector to form electric connection, a port switching circuit for switching QSFP28 to SFP28 and enabling the QSFP+ to be downwards compatible is arranged on the PCB board, the circuit comprises an SFP28 interface and a four-channel QSFP28 interface, receiving ports Rxp and Rxn of one channel in the four-channel QSFP28 interface are connected with receiving ports RD+ and RD of the SFP28 interface, transmitting ports TD+ and TD-of the SFP28 interface are connected with transmitting ports Txp and Txn of the corresponding one channel in the four-channel QSFP28 interface, so that one channel in the four-channel QSFP28 interface and the SFP28 interface perform signal transmission, the switching of the QSFP28 function to the SFP28 function is achieved, the switching of the QSFP+ to the SFP+ is downwards compatible, the receiving ports of the other three channels in the four-channel QSFP28 interface do not perform signal transmission, and the transmitting ports of the other three channels in the four-channel QSFP28 interface do not perform signal transmission;
a communication signal conversion circuit is arranged between the SFP28 interface and the four-way QSFP28 interface; the communication signal conversion circuit comprises an I2C module, wherein an SCL pin and an SDA pin of a four-way QSFP28 interface and an SCL pin and an SDA pin of an SFP28 interface are respectively connected with pins corresponding to the I2C module, so that I2C communication conversion is realized;
the I2C module can read EEPROM information in the SFP28/SFP+ module from I2C communication to obtain the transmission rate of the module, so that whether the inserted module model is SFP28 or SFP+ is automatically identified, and if the signal is in a high-rate mode of 25GB/s, the SFP28 mode is converted; if the signal is in a low rate mode of 10GB/s, the signal is converted in SFP+ mode.
2. The port switching device of claim 1, wherein: the unlocking device comprises a front end part and a rear end part which are connected with each other, wherein the front end part is provided with two parallel side plates and a bottom plate fixed between the two parallel side plates, the left side plate and the right side plate of the front end part of the unlocking device are provided with an upper bulge which extends upwards and a lower bulge which extends downwards, the bottom plate is provided with a limit groove corresponding to the lower bulge of the left side plate and the right side plate of the unlocking device, the upper cover is provided with a limit groove corresponding to the upper bulge of the left side plate and the right side plate of the unlocking device, the lower bulge of the left side plate and the right side plate of the unlocking device extends into the limit groove corresponding to the bottom plate, and the upper bulge of the left side plate and the right side plate of the front end part of the unlocking device extends into the limit groove corresponding to the upper cover, so that the unlocking device has a certain degree of freedom in the direction of inserting and separating the SFP28 module from the switching equipment; the left side plate end and the right side plate end of the front end of the unlocking device are provided with outward bending parts to form unlocking parts for enabling corresponding QSFP28 cage spring plates to separate from port switching equipment to spring; the bottom plate of unlocking device front end is equipped with the spring separation blade that upwards extends, the spring separation blade on the bottom plate of unlocking device front end stretches into in the spring mounting groove of bottom plate under the bottom plate, contacts with spring one end in the spring mounting groove, makes the spring provide the power that resets for unlocking device.
3. The port switching device of claim 2, wherein: the rear end part of the unlocking device is provided with a U-shaped handle, and the handle is fixedly connected with the left side plate and the right side plate of the front end part of the unlocking device; the two ends of the U-shaped handle are respectively provided with a connecting plate, the end faces of the two connecting plates are provided with slots, and the left side plate and the right side plate of the front end part of the unlocking device are respectively inserted into the slots of the two connecting plates of the two ends of the U-shaped handle to be fixed.
4. The port switching device of claim 1, wherein: the cross section of hasp sheet metal component is U type, the outer wall is equipped with the joint boss about the upper cover afterbody, the lateral wall is equipped with the bayonet socket about the hasp sheet metal component for with the joint boss joint cooperation that the upper cover afterbody was equipped with.
5. The port switching device of claim 1, wherein: the bottom shell is clamped with the tail end of the upper cover, and the bottom shell is fixedly connected with the head end of the upper cover through bolts; the heads of the bottom shell and the upper cover are respectively provided with corresponding bolt mounting holes.
6. The port switching circuit for switching the QSFP28 to the SFP28 and enabling the QSFP28 to be downwards compatible with the SFP+ is characterized by comprising an SFP28 interface and a four-channel QSFP28 interface, wherein receiving ports Rxp and Rxn of one channel in the four-channel QSFP28 interface are connected with receiving ports RD+, RD-of the SFP28 interface, transmitting ports TD+ and TD-of the SFP28 interface are connected with transmitting ports Txp and Txn of a corresponding channel in the four-channel QSFP28 interface, so that one channel in the four-channel QSFP28 interface and the SFP28 interface perform signal transmission, the switching from the QSFP28 function to the SFP28 function is achieved, meanwhile, the receiving ports of the other three channels in the four-channel QSFP28 interface are not subjected to signal transmission, and the transmitting ports of the other three channels in the four-channel QSFP28 interface are not subjected to signal transmission;
a communication signal conversion circuit is arranged between the SFP28 interface and the four-way QSFP28 interface; the communication signal conversion circuit comprises an I2C module, wherein an SCL pin and an SDA pin of a four-way QSFP28 interface and an SCL pin and an SDA pin of an SFP28 interface are respectively connected with pins corresponding to the I2C module, so that I2C communication conversion is realized;
the I2C module chip can read EEPROM information in the SFP28/SFP+ module from I2C communication to obtain the transmission rate of the module, thereby automatically identifying whether the inserted module model is SFP28 or SFP+, and converting in the SFP28 mode if the signal is in the high-rate mode of 25 GB/s; if the signal is in a low rate mode of 10GB/s, the signal is converted in SFP+ mode.
7. The circuit of claim 6, wherein: the Tx_FAult pin and the Rx_LOS pin of the SFP28 interface are connected with the INTL pin of the four-channel QSFP28 interface through an OR gate chip, and when any one of the Tx_FAULT signal and the Rx_LOS signal is at a high level, the INTL signal is set high to realize the conversion of interrupt signals; the RESETL pin of the four-channel QSFP28 interface is connected with the TX_DISABLE pin of the SFP28 interface through a first NOT chip to realize level conversion; the LPMODE pin of the four-channel QSFP28 interface is connected with the RS0 pin of the SFP28 interface through a second NOT gate chip to realize level conversion; the LPMODE pin of four-channel QSFP28 interface is connected with the RS1 pin of SFP28 interface through the MOS pipe, the grid of MOS pipe is connected with the LPMODE pin of four-channel QSFP28 interface, the source ground of MOS pipe, the drain electrode of MOS pipe is connected with the RS1 pin of SFP28 interface, one end of resistance R18 respectively, and 3.3V voltage is connected to the other end of resistance R18.
8. The circuit of claim 6, wherein: the ModSelL pin of the four-channel QSFP28 interface is connected with the enabling signal end of the I2C module, so that the ModSelL signal is used as an enabling signal, and when the ModSelL signal is set to be 1, the I2C signal can only pass through.
9. The circuit of claim 6, wherein: the resistors are connected between the positive and negative receiving ports of the remaining three channels of the four-channel QSFP28 interface, so that the receiving ports of the remaining three channels in the four-channel QSFP28 interface do not transmit signals, and the resistors are connected between the positive and negative transmitting ports of the remaining three channels of the four-channel QSFP28 interface, so that the transmitting ports of the remaining three channels in the four-channel QSFP28 interface do not transmit signals.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910100248.8A CN109814212B (en) | 2019-01-31 | 2019-01-31 | QSFP28 to SFP28 port and downward compatible QSFP+ to SFP+ port switching device and circuit |
| US16/547,205 US10986429B2 (en) | 2019-01-31 | 2019-08-21 | All-in-one converter using a low-speed optical module on a high-speed switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910100248.8A CN109814212B (en) | 2019-01-31 | 2019-01-31 | QSFP28 to SFP28 port and downward compatible QSFP+ to SFP+ port switching device and circuit |
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| CN109814212A CN109814212A (en) | 2019-05-28 |
| CN109814212B true CN109814212B (en) | 2024-03-05 |
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| CN201910100248.8A Active CN109814212B (en) | 2019-01-31 | 2019-01-31 | QSFP28 to SFP28 port and downward compatible QSFP+ to SFP+ port switching device and circuit |
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| CN112817097A (en) * | 2019-11-15 | 2021-05-18 | 海思光电子有限公司 | Converter module shell structure |
| EP4080257A4 (en) * | 2019-12-31 | 2022-12-21 | Huawei Technologies Co., Ltd. | Optical module unlocking apparatus, optical module and optical communication device |
| CN111541957A (en) * | 2020-04-21 | 2020-08-14 | 武汉英飞光创科技有限公司 | Method for modifying default value of signal integrity register and optical module |
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