CN112187606A

CN112187606A - FC-AE-1553 network system

Info

Publication number: CN112187606A
Application number: CN202011078206.8A
Authority: CN
Inventors: 房亮; 熊志新; 葛鹏; 谢京州; 乔旷怡; 王雪倩; 刘新龙; 薛晓波
Original assignee: Beijing Tasson Science and Technology Co Ltd
Current assignee: Beijing Tasson Science and Technology Co Ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2021-01-05
Anticipated expiration: 2040-10-10
Also published as: CN112187606B

Abstract

The invention relates to an FC-AE-1553 network system which comprises a plurality of network nodes and a switch. The switch is connected to a plurality of network nodes. Each network node includes a first transmit link connector and a first receive link connector. The switch includes a second receive link connector and a second transmit link connector. The first transmitting link connector and the second receiving link connector are connected through a shielded twisted pair. The second transmitting link connector is connected with the second receiving link connector through a shielded twisted pair. The network node is connected to the switch through two pairs of shielding twisted-pair cables, and the problems that the optical fiber cable cannot bear high temperature and is high in cost are solved. Therefore, the FC-AE-1553 network system adopts the shielded twisted pair for transmission, is more resistant to high temperature, cheaper in cost, stronger in anti-interference capability and easy to wire. And the transmission rate of the FC-AE-1553 network system can reach 1.0625 Gbps.

Description

FC-AE-1553 network system

Technical Field

The invention relates to the technical field of communication, in particular to an FC-AE-1553 network system.

Background

The FC-AE (fibre channel avionics) standard is a set of upper Level protocols (Up Level protocols) defined for avionics system features. These upper layer protocols select a portion of the underlying applications of the FC base protocol suite, dedicated to several aspects of avionics commands, control, instrumentation, simulation, signal processing and sensors, video data distribution, and the like. FC-AE-1553 is short for Fiber Channel-Avionics Environment-Upper Layer Protocol MIL-STD-1553B, and is used for realizing mapping of a traditional MIL-STD-1553B Notice 2 bus Protocol on an FC-4 Layer of a Fiber Channel so as to realize communication with certainty in a command/response mode in real-time aviation application.

However, the conventional FC-AE-1553 network system mainly uses an optical fiber medium for transmission, and thus cannot reliably operate for a long time in environments such as a high-temperature scene, and the cost is high.

Disclosure of Invention

In view of the above, it is necessary to provide an FC-AE-1553 network system.

The invention provides an FC-AE-1553 network system. The FC-AE-1553 network system comprises a plurality of network nodes and a switch. The switch is connected to a plurality of the network nodes. Each of the network nodes includes a first transmit link connector and a first receive link connector. The switch includes a second receive link connector and a second transmit link connector. The first transmitting link connector and the second receiving link connector are connected through a shielded twisted pair. The second transmission link connector and the second receiving link connector are connected through a shielded twisted pair.

In the FC-AE-1553 network system, the FC data transmission path includes the network node, the shielded twisted pair, and the switch. The network node is connected to the switch by two pairs of shielded twisted pair cables. The shielding twisted pair is twisted together through two insulated copper conductors, so that differential signals can be better transmitted, and the common-mode anti-interference capability is improved. Meanwhile, the shielded twisted pair is wrapped by metal copper foil. And the shielding twisted-pair wires are wrapped by metal braiding to form a two-layer shielding effect. Furthermore, the return loss of the shielded twisted pair is not more than-20 dB at 0 GHZ-2 GHZ, and the characteristic impedance Z0 is 100 omega +/-10%. When a length of 70 meters is transmitted, the cable loss is not more than 0.15dB/m at 531 MHz. When transmitting 50 meters in length, the cable loss is no more than 0.20dB/m at 531 MHz. When transmitting 30 meters in length, the cable loss is no more than 0.22dB/m at 531 MHz. When in the interval of 500MHZ to 1GHZ, the crosstalk attenuation quantity between the shielding twisted pairs is not less than 40 dB.

Therefore, the first sending link connector and the second receiving link connector are connected through the sending shielding twisted pair, and the first receiving link connector and the second sending link connector are connected through the receiving shielding twisted pair, so that the FC-AE-1553 network system transmits an FC-AE-1553 protocol by using a shielding twisted pair cable, and the problems that an optical fiber cable cannot bear high temperature and is high in cost can be solved. Therefore, compared with FC-AE-1553 optical fiber transmission, the FC-AE-1553 network system is more resistant to high temperature by adopting shielded twisted pair transmission and can resist the high temperature of 125-250 ℃. Meanwhile, compared with FC-AE-1553 optical fiber coaxial transmission, the FC-AE-1553 network system has the advantages of lower cost, higher anti-interference capability and easiness in wiring due to the adoption of a shielding twisted pair. And the transmission rate of the FC-AE-1553 network system can reach 1.0625 Gbps.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a star networking topology provided by the present invention.

FIG. 2 is a schematic diagram of the schematic structure of the FC-AE-1553 network system provided by the invention.

Fig. 3 is a schematic structural diagram of a schematic structure of a transmitting-end circuit provided in the present invention.

Fig. 4 is a schematic diagram of a schematic structure of a receiving end circuit according to the present invention.

Fig. 5 is a table of transmitter electrical performance constraints provided by the present invention.

Fig. 6 is a transmitter test circuit provided by the present invention.

Fig. 7 is a table of receiver electrical performance constraints provided by the present invention.

Fig. 8 is a circuit for testing a receiver according to the present invention.

Fig. 9 is a table of the electrical performance constraints for a drive provided by the present invention.

Fig. 10 is a table of equalizer electrical performance constraints provided by the present invention.

Fig. 11 is a table of equalizer design indicators provided by the present invention.

Fig. 12 is a transmitted signal eye diagram template provided by the present invention.

Fig. 13 is a constraint parameter table of an eye diagram template of a transmitted signal according to the present invention.

Fig. 14 is a received signal eye diagram template provided by the present invention.

Fig. 15 is a table of eye diagram parameters of received signals according to the present invention.

Fig. 16 is a transformer characteristic requirement constraint parameter table provided by the present invention.

Description of reference numerals:

FC-AE-1553 network system 100, a plurality of network nodes 10, a transmitting-side circuit 110, a first transmitting link connector 111, a first transmitting transformer 112, a first transmitting driver 113, a first transmitter 114, a first auxiliary circuit 115, a second auxiliary circuit 116, a receiving-side circuit 120, a first receiving link connector 121, a first receiving transformer 122, a first receiving equalizer 123, a first receiver 124, a third auxiliary circuit 125, a fourth auxiliary circuit 126, a switch 20, a switch receiving-side circuit 210, a second receiving link connector 211, a second receiving transformer 212, a second receiving equalizer 213, a second receiver 214, a switch transmitting-side circuit 220, a second transmitting link connector 221, a second transmitting transformer 222, a second transmitting driver 223, a second transmitter 224.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Referring to fig. 1 and 2, the present invention provides an FC-AE-1553 network system 100. The FC-AE-1553 network system 100 includes a plurality of network nodes 10 and a switch 20. The switch 20 is connected to a plurality of the network nodes 10. Each of the network nodes 10 comprises a first transmit link connector 111 and a first receive link connector 121. The switch 20 includes a second receive link connector 211 and a second transmit link connector 221. The first transmission link connector 111 and the second reception link connector 211 are connected by shielded twisted pair. The second transmit link connector 121 is connected to the second receive link connector 221 by shielded twisted pair.

In this embodiment, in the FC-AE-1553 network system 100, one switch 20 is connected to a plurality of network nodes 10 to form a star networking topology (as shown in fig. 1). The switch 20 is an FC switch and has a plurality of FC ports. Each FC port is connected to one of the network nodes 10. The network node 10 may be an NC or NT. At this time, the FC data transmission path includes the network node 10, shielded twisted pair (including transmission shielded twisted pair and reception shielded twisted pair), and the switch 20. The network node 10 is connected to the switch 20 by transmit shielded twisted pair and receive shielded twisted pair (i.e., two pairs of shielded twisted pair cables).

The shielding twisted pair is twisted together through two insulated copper wires, so that differential signals can be better transmitted, and the common-mode anti-interference capability is improved. Meanwhile, the shielded twisted pair is wrapped by metal copper foil. And the shielding twisted-pair wires are wrapped by metal braiding to form a two-layer shielding effect. Furthermore, the return loss of the shielded twisted pair is not more than-20 dB at 0 GHZ-2 GHZ, and the characteristic impedance Z0 is 100 omega +/-10%. When a length of 70 meters is transmitted, the cable loss is not more than 0.15dB/m at 531 MHz. When transmitting 50 meters in length, the cable loss is no more than 0.20dB/m at 531 MHz. When transmitting 30 meters in length, the cable loss is no more than 0.22dB/m at 531 MHz. When in the range of 500MHz to 1GHz, the crosstalk attenuation amount between the shielded twisted pairs (including the transmitting shielded twisted pair and the receiving shielded twisted pair) is not less than 40 dB.

Therefore, the first transmit link connector 111 is connected with the second receive link connector 211 through a transmit shielding twisted pair, and the first receive link connector 121 is connected with the second transmit link connector 221 through a receive shielding twisted pair, so that the FC-AE-1553 network system 100 uses a shielded twisted pair cable to transmit an FC-AE-1553 protocol, and the problems that an optical fiber cable cannot withstand high temperature and is high in cost can be solved. Therefore, compared with the FC-AE-1553 optical fiber transmission, the FC-AE-1553 network system 100 is more resistant to high temperature by adopting a shielded twisted pair transmission and can resist the high temperature of 125-250 ℃. Meanwhile, compared with the FC-AE-1553 optical fiber coaxial transmission, the FC-AE-1553 network system 100 has the advantages of lower cost, higher anti-interference capability and easiness in wiring due to the adoption of a shielding twisted pair. And the transmission rate of the FC-AE-1553 network system 100 can reach 1.0625 Gbps.

In one embodiment, when the first transmit link connector 111 and the second receive link connector 211 are connected by shielded twisted pairs, the shielded twisted pairs and the first transmit link connector 111 and the second receive link connector 211 respectively provide 360 ° integral shielding therebetween. The shielded twisted pair lines and the second transmission link connector 121 and the second reception link connector 221 are respectively provided with 360-degree integral shielding.

Referring to fig. 2 and 3, in one embodiment, each of network nodes 10 includes a transmitting-end circuit 110. The transmission-side circuit 110 includes the first transmission link connector 111, a first transmission transformer 112, a first transmission driver 113, a first transmitter 114, a first auxiliary circuit 115, and a second auxiliary circuit 116. A first transmitting terminal of the first transmitter 114 is connected to a first terminal of the first auxiliary circuit 115. A second terminal of the first auxiliary circuit 115 is connected to a first input terminal of the first transmit driver 113. A second transmitting terminal of the first transmitter 114 is connected to a third terminal of the first auxiliary circuit 115. The fourth terminal of the first auxiliary circuit 115 is connected to the second input terminal of the first transmit driver 113. The first auxiliary circuit 115 is used to realize ac coupling between the first transmitter 114 and the first transmission driver 113, and to realize input interface level matching of the first transmission driver 113.

A first output terminal of the first transmit driver 113 is connected to a first terminal of the second auxiliary circuit 116. A second terminal of the second auxiliary circuit 116 is connected to a first input terminal of the first transmitting transformer 112. A second output terminal of the first transmission driver 113 is connected to a third terminal of the second auxiliary circuit 116. The fourth terminal of the second auxiliary circuit 116 is connected to the second input terminal of the first transmitting transformer 112. The second auxiliary circuit 116 is used to implement ac coupling between the first transmission transformer 112 and the first transmission driver 113, and implement output interface level matching of the first transmission driver 113. A first output terminal of the first transmission transformer 112 is connected to a first input terminal of the first transmission link connector 111. A second output terminal of the first transmission transformer 112 is connected to a second input terminal of the first transmission link connector 111.

In this embodiment, the first auxiliary circuit 115 is disposed between the first transmitter 114 and the first transmission driver 113, so that the output end of the first transmitter 114 and the first transmission driver 113 are connected by ac coupling. Meanwhile, the first auxiliary circuit 115 can match the input interface level of the first transmission driver 113 according to the actual application scenario, which is more beneficial to the data transmission between the first transmitter 114 and the first transmission driver 113.

The second auxiliary circuit 116 is disposed between the first transmission transformer 112 and the first transmission driver 113, so that the output end of the first transmission driver 113 is connected to the first transmission transformer 112 in an ac coupling manner. Meanwhile, the second auxiliary circuit 116 can match the interface level of the output terminal of the first transmission driver 113 according to the actual application scenario, which is more favorable for data transmission between the first transmission transformer 112 and the first transmission driver 113.

Referring to fig. 3, in an embodiment, the first auxiliary circuit 115 includes a first transmitting capacitor C1, a second transmitting capacitor C2, a first transmitting resistor R1, a second transmitting resistor R2, a third transmitting resistor R3 and a fourth transmitting resistor R4. One end of the first transmitting capacitor C1 is connected to the first transmitting end of the first transmitter 114. The other end of the first transmitting capacitor C1 is connected to a first input terminal of the first transmitting driver 113. One end of the second transmitting capacitor C2 is connected to the second transmitting terminal of the first transmitter 114. The other end of the second transmitting capacitor C2 is connected to the second input terminal of the first transmitting driver 113. One end of the first sending resistor R1 is connected to a power supply VCC. The other end of the first transmitting resistor R1 is connected to a first input terminal of the first transmitting driver 113. One end of the second sending resistor R2 is connected to a power supply VCC. The other end of the second transmitting resistor R2 is connected to a second input terminal of the first transmitting driver 113. One end of the third transmission resistor R3 is connected to the first input terminal of the first transmission driver 113. The other end of the third transmitting resistor R3 is grounded. One end of the fourth transmission resistor R4 is connected to the second input terminal of the first transmission driver 113. The other end of the fourth sending resistor R4 is grounded.

In this embodiment, the first transmitting capacitor C1, the first transmitting resistor R1, and the third transmitting resistor R3 are connected to one side of the first input terminal of the first transmitting driver 113. The first transmitting terminal of the first transmitter 114 is ac-coupled to the first input terminal of the first transmitting driver 113 via the first transmitting capacitor C1. Interface level matching of the first input terminal of the first transmit driver 113 is achieved through the first transmit resistor R1 and the third transmit resistor R3.

The second transmitting capacitor C2, the second transmitting resistor R2, and the fourth transmitting resistor R4 are connected to one side of the second input terminal of the first transmitting driver 113. The second transmitting terminal of the first transmitter 114 is ac-coupled to the second input terminal of the first transmit driver 113 via the second transmit capacitor C2. Interface level matching of the second input terminal of the first transmit driver 113 is achieved through the second transmit resistor R2 and the fourth transmit resistor R4.

Referring to fig. 3, in one embodiment, the second auxiliary circuit 116 includes a third transmitting capacitor C3, a fourth transmitting capacitor C4, a fifth transmitting resistor R5 and a sixth transmitting resistor R6. One end of the third transmitting capacitor C3 is connected to the first output terminal of the first transmitting driver 113. The other end of the third transmitting capacitor C3 is connected to the first input terminal of the first transmitting transformer 112. One end of the fourth transmitting capacitor C4 is connected to the second output terminal of the first transmitting driver 113. The other end of the fourth transmitting capacitor C4 is connected to the second input terminal of the first transmitting transformer 112. One end of the fifth transmission resistor R5 is connected to the first output terminal of the first transmission driver 113. The other end of the fifth sending resistor R5 is grounded. One end of the sixth transmitting resistor R6 is connected to the second output terminal of the first transmitting driver 113. The other end of the sixth sending resistor R6 is grounded.

In this embodiment, the fifth transmitting resistor R5 and the third transmitting capacitor C3 are connected to one side of the first output terminal of the first transmitting driver 113. The ac coupling between the first output of the first transmit driver 113 and the first input of the first transmit transformer 112 is realized by the third transmit capacitor C3. Interface level matching of the first output terminal of the first transmit driver 113 is achieved by the fifth transmit resistor R5.

The fourth transmitting capacitor C4 and the sixth transmitting resistor R6 are connected to one side of the second output terminal of the first transmitting driver 113. The second output of the first transmit driver 113 is ac-coupled to the second input of the first transmit transformer 112 via the fourth transmit capacitor C4. Interface level matching of the second output terminal of the first transmit driver 113 is achieved by the sixth transmit resistor R6.

In one embodiment, the capacitance values of the first transmitting capacitor C1, the second transmitting capacitor C2, the third transmitting capacitor C3 and the fourth transmitting capacitor C4 are 0.1 μ F. The resistance values of the first sending resistor R1, the second sending resistor R2, the third sending resistor R3, the fourth sending resistor R4, the fifth sending resistor R5 and the sixth sending resistor R6 may be determined according to interface level matching of the first sending driver 113.

Referring to fig. 4, in one embodiment, each of the network nodes 10 includes a sink circuit 120. The receiving end circuit 120 includes the first receiving link connector 121, a first receiving transformer 122, a first receiving equalizer 123, a first receiver 124, a third auxiliary circuit 125, and a fourth auxiliary circuit 126. A first output terminal of the first receiving link connector 121 is connected to a first input terminal of the first receiving transformer 122. A second output terminal of the first receiving link connector 121 is connected to a second input terminal of the first receiving transformer 122. A first output terminal of the first receiving transformer 122 is connected to a first terminal of the fourth auxiliary circuit 126. A second terminal of the fourth auxiliary circuit 126 is connected to a first input terminal of the first receiving equalizer 123. A second output terminal of the first receiving transformer 122 is connected to a third terminal of the fourth auxiliary circuit 126. The fourth terminal of the fourth auxiliary circuit 126 is connected to the second input terminal of the first receiving equalizer 123. The fourth auxiliary circuit 126 is used for ac coupling between the first receiving transformer 122 and the first receiving equalizer 123. A first output terminal of the first receiving equalizer 123 is connected to a first terminal of the third auxiliary circuit 125. A second terminal of the third auxiliary circuit 125 is connected to a first receiving terminal of the first receiver 124. A second output terminal of the first receiving equalizer 123 is connected to a third terminal of the third auxiliary circuit 125. The fourth terminal of the third auxiliary circuit 125 is connected to the second receiving terminal of the first receiver 124. The third auxiliary circuit 125 is used for ac coupling between the first receiving equalizer 123 and the first receiver 124 and output interface level matching of the first receiving equalizer 123.

In this embodiment, the third auxiliary circuit 125 is disposed between the first receiver 124 and the first receiving equalizer 123, so that the receiving end of the first receiver 124 is connected to the first receiving equalizer 123 by an ac coupling method. Meanwhile, the third auxiliary circuit 125 may match the level of the output port of the first receiving equalizer 123 according to an actual application scenario, which is more favorable for data transmission between the first receiving equalizer 123 and the first receiver 124.

The fourth auxiliary circuit 126 is disposed between the first receiving transformer 122 and the first receiving equalizer 123, so that the first receiving equalizer 123 and the first receiving transformer 122 are connected by ac coupling.

Referring to fig. 4, in an embodiment, the third auxiliary circuit 125 includes a first receiving capacitor C1, a second receiving capacitor C2, a first receiving resistor R1 and a second receiving resistor R2. One end of the first receiving capacitor C1 is connected to the first receiving end of the first receiver 124. The other end of the first receiving capacitor C1 is connected to the first output terminal of the first receiving equalizer 123. One end of the second receiving capacitor C2 is connected to the second receiving end of the first receiver 124. The other end of the second receiving capacitor C2 is connected to the second output terminal of the first receiving equalizer 123. One end of the first receiving resistor R1 is connected to the first output terminal of the first receiving equalizer 123. The other end of the first receiving resistor R1 is grounded. One end of the second receiving resistor R2 is connected to the second output terminal of the first receiving equalizer 123. The other end of the second receiving resistor R2 is grounded.

In this embodiment, the first receiving capacitor C1 and the first receiving resistor R1 are connected to one side of the first output terminal of the first receiving equalizer 123. The first receiving end of the first receiver 124 is ac-coupled to the first output end of the first receiving equalizer 123 via the first receiving capacitor C1. The interface level matching of the first output terminal of the first receiving equalizer 123 is realized by the first receiving resistor R1.

The second receiving capacitor C2 and the second receiving resistor R2 are connected to one side of the second output terminal of the first receiving equalizer 123. The second receiving end of the first receiver 124 is ac-coupled to the second output end of the first receiving equalizer 123 via the second receiving capacitor C2. Interface level matching of the second output terminal of the first receiving equalizer 123 is achieved by the second receiving resistor R2.

In one embodiment, the fourth auxiliary circuit 126 includes a third receiving capacitor C3 and a third receiving capacitor C4. One end of the third receiving capacitor C3 is connected to the first input terminal of the first receiving equalizer 123. The other end of the third receiving capacitor C3 is connected to the first output terminal of the first receiving transformer 122. One end of the third receiving capacitor C4 is connected to the second input terminal of the first receiving equalizer 123. The other end of the third receiving capacitor C4 is connected to the second output terminal of the first receiving transformer 122.

In this embodiment, the third receiving capacitor C3 is connected to one side of the first input end of the first receiving equalizer 123, so that ac coupling between the first input end of the first receiving equalizer 123 and the first output end of the first receiving transformer 122 is realized.

The third receiving capacitor C4 is connected to one side of the second input terminal of the first receiving equalizer 123, so that ac coupling between the second input terminal of the first receiving equalizer 123 and the second output terminal of the first receiving transformer 122 is realized.

In one embodiment, the capacitance values of the first transmitting capacitor C1, the second transmitting capacitor C2, the third transmitting capacitor C3 and the fourth transmitting capacitor C4 are 0.1 μ F. The resistance values of the first receiving resistor R1 and the second receiving resistor R2 may be determined according to the interface level matching of the first receiving equalizer 123.

In one embodiment, the switch receiving end circuit 210 in the switch 20 includes a second receiving link connector 211, a second receiving transformer 212, a second receiving equalizer 213, and a second receiver 214. The switch receiving side circuit 210 is the same as the receiving side circuit 120. The second receive link connector 211 is identical to the first receive link connector 121. The second receiving transformer 212 is identical to the first receiving transformer 122. The second receive equalizer 213 is the same as the first receive equalizer 123. The second receiver 214 is identical to the first receiver 124.

The switch initiator circuit 220 in the switch 20 includes a second transmit link connector 221, a second transmit transformer 222, a second transmit driver 223, and a second transmitter 224. Switch sending-end circuit 220 is the same as sending-end circuit 110. The second transmission link connector 221 is identical to the first transmission link connector 111. The second transmission transformer 222 is identical to the first transmission transformer 112. The second transmission driver 223 is the same as the first transmission driver 113. The second transmitter 224 is the same as the first transmitter 114.

In one embodiment, the characteristic impedance Z0 of the first transmit link connector 111, the first receive link connector 121, the second receive link connector 211, and the second transmit link connector 221 is 100 Ω ± 10%. Meanwhile, the insertion loss of the first transmission link connector 111, the first reception link connector 121, the second reception link connector 211, and the second transmission link connector 221 is not more than 0.01dB at 531 MHZ.

In one embodiment, the pin remnant height of the first transmit link connector 111, the first receive link connector 121, the second receive link connector 211, and the second transmit link connector 221 is less than 1 mm.

In this embodiment, after the first transmit link connector 111, the first receive link connector 121, the second receive link connector 211, and the second transmit link connector 221 are electrically connected, extra pins need to be cut. Set up the remaining height of pin for being less than 1mm, can avoid the signal reflection that the stub leads to, realize good signal quality. Therefore, the residual height of the pin is set to be less than 1mm, so that the error rate of less than 10 under the high-speed condition of 1.0625Gbps of the FC-AE-1553 protocol can be realized^-12。

Referring to fig. 5 and 6, in one embodiment, the output swing of the first transmitter 114 ranges from 800mV to 1200 mV. The output common mode level of the first transmitter 114 ranges from 900mV to 1000 mV.

In this embodiment, the first transmitter 114 is a protocol chip transmitter similar to the second transmitter 224, and outputs a Serdes signal converted from 8B/10B through a physical layer of a protocol, and the output level is a CML level. The internal resistance of the first transmitter 114 is 100 Ω. When terminated as per fig. 6, 50 ohm resistors are connected at the differential level and to ground, respectively. A test is performed at the port of the first transmitter 114 (e.g., point T in fig. 6) with the output signal level characteristics shown in fig. 5. Wherein the output swing ranges from 800mV to 1200 mV. The common mode level VCM of the output is between 900mV and 1000 mV.

Referring to fig. 7 and 8, in one embodiment, the input swing of the first receiver 124 ranges from 150mV to 1200 mV. The input common mode level of the first receiver 124 ranges from 750mV to 850 mV.

In this embodiment, the first receiver 124 is the same as the second receiver 214, and is a protocol chip receiver. The signal input by the protocol chip receiver is a serial Serdes signal, and the input level is CML level. The internal resistance of the first receiver 124 is 100 Ω. When the termination is performed according to fig. 8, an equivalent resistance of 50 ohms is connected to the front-end differential signal of the first receiver 124 and grounded, respectively, when the termination is performed according to fig. 6. A test is performed at the port of the first receiver 124 (e.g., point R in fig. 8) with the output signal level characteristics shown in fig. 7. Wherein the swing of the level characteristic input of the first receiver 124 is between 150mV and 1200mV, and the common mode level VCM of the input is between 750mV and 850 mV.

Referring to fig. 9, in one embodiment, the output level of the first transmission driver 113 ranges from 1100mV to 2000mV, and the time for the output level to rise and fall ranges from 100ps to 510 ps. The deterministic level jitter of the first transmission driver 113 is 0.1UI and the level of the first transmission driver 113 is always jittered by 0.15 UI.

In this embodiment, the first transmission driver 113 is the same as the second transmission driver 223, and is mainly used for enhancing the transmission signal and making the signal transmission distance longer. The input/output signal level of the first transmission driver 113 may be a high-speed signal level such as CML, LVDS, LVPECL, etc. The pull-up and pull-down resistor completion signal level matching is realized by the first transmitting resistor R1, the second transmitting resistor R2, the third transmitting resistor R3, the fourth transmitting resistor R4 in the first auxiliary circuit 115, the fifth transmitting resistor R5 in the second auxiliary circuit 116, and the sixth transmitting resistor R6. Wherein the output signal level characteristics of the first transmission driver 113 are: maximum output level 2000mV, minimum output level 1100mV, deterministic level jitter 0.1UI, total jitter 0.15UI, maximum value of level rise time 510ps, minimum value 100 ps. The maximum value of the level-down time is 510ps and the minimum value is 100 ps.

Referring to fig. 10, in one embodiment, the minimum sensitivity of the first receive equalizer 123 is 150 mV. The maximum input voltage of the first receiving equalizer 123 is 2400 mV. The first receiving equalizer 123 has a receiving jitter tolerance of 0.5 UI. The return loss S11 of the first receive equalizer 123 is-15 dB.

In this embodiment, the first receiving equalizer 123 is the same as the second receiving equalizer 213, and is used to correct timing loss and attenuation of a transmission signal caused by a difference in propagation delay between high frequency components during cable transmission. The input/output signal level of the first receiving equalizer 123 may be a high-speed signal level such as CML, LVDS, LVPECL, etc. The pull-up and pull-down resistor matching is achieved through the first receiving resistor R1 and the second receiving resistor R2 in the third auxiliary circuit 125. The input signal level characteristic of the first receiving equalizer 123 is shown in fig. 10.

Meanwhile, the first receiving equalizer 123 has low attenuation at low frequency and high attenuation at high frequency, and the overall frequency response is smoother. Also, the first receiving equalizer 123 has a linear phase characteristic, and a constant phase delay or a high frequency phase delay is less than a low frequency phase delay. The phase delay of the shielded twisted pair cable is compensated for when the high frequency delay is less than the phase delay of the low frequency.

In one embodiment, when the FC shielded twisted pair network system is at 1.0625Gbps rate, the first receive equalizer 123 has the index characteristic shown in fig. 11.

Referring to fig. 12 and 13, in an embodiment, the transmission channel signal in the shielded twisted pair performs signal transmission according to a transmission signal eye pattern template.

In this embodiment, the transmission signal is a signal entering the twisted pair transmission channel through the connector, fig. 12 is an eye diagram template of the transmission signal, and fig. 13 is an eye diagram template constraint parameter.

Referring to fig. 14 and 15, in one embodiment, the receiving channel signals in the shielded twisted pair are received according to a receiving signal eye pattern template.

In this embodiment, the received signal is a signal entering the twisted pair receiving channel through the connector, fig. 14 is a received signal eye diagram template, and fig. 15 is a received eye diagram template constraint parameter.

In one embodiment, the insertion loss of a link in the FC-AE-1553 network system 100 is not greater than 0.05dB at 1 GHZ. No more than 0.15dB at 2 GHZ.

In one embodiment, the layout of the devices in the FC-AE-1553 network system 100 arranges FC protocol chips, drivers and equalizers, transformers and connectors in sequence according to signal orientation. Meanwhile, no interference device with high power and large heat productivity is arranged at the periphery of the device.

In one embodiment, the high speed differential signals received and transmitted in the FC-AE-1553 network system 100 run on inner striplines with full plane references above and below. The vias of the printed board differential traces between the receiver and the transmitter to the connector correspond to no more than 6 pairs. The insertion loss of each pair of via holes is not more than 0.06dB at 1GHZ and not more than 0.1dB at 2 GHZ. And differential impedance control is carried out on the via holes of the differential signal paths, and the differential impedance of the via holes is 100 omega +/-10%. The insertion loss of the printed circuit board wiring is not more than 0.024dB/inch at 1 GHZ. The differential pair wires are equal in length, and the difference value is not more than 10 mil. The total length of FC high speed differential traces on the network node 10 is less than 10 inch. The impedance of the differential routing is controlled to be 100 omega +/-10%.

In one embodiment, an isolation strip is disposed between the primary and secondary windings of the first transmitting transformer 112. Wherein the primary coil of the first transmission transformer 112 and the first transmission link connector 111 form a chassis ground plane. The secondary winding of the first transmission transformer 112 forms a digital ground plane with the first transmitter 114 and the first transmission driver 113. And the plurality of high-voltage capacitors are arranged between the primary coil and the secondary coil and used for connecting the shell ground plane and the digital ground plane through the plurality of high-voltage capacitors.

In this embodiment, the first transmitting transformer 112, the first receiving transformer 122, the second receiving transformer 212 and the second transmitting transformer 222 are the same. The transformer primary and secondary are electrically isolated from each other. At this time, the primary and secondary of the transformer are separated into two planes by an isolation strip of at least 80mil on the PCB. The board edge area of the primary side of the transformer, the connector and the like is a shell ground plane (GND _ EARTH). The transformer secondary, the FC protocol chip receiver or the FC protocol chip transmitter, the driver and the equalizer are positioned on a digital ground plane (GND). The GND and GND _ ear signals of different layers cannot overlap each other in the projection direction and form coupling. The chassis ground plane (GND _ ear) is a complete plane that serves as a reference plane for the connectors and output signals. The chassis ground plane needs to be connected with the PCB metalized hole and the metal shell of the connector, and finally forms a shielding whole with the chassis.

The chassis ground plane (GND _ EARTH) and the digital ground plane (GND) need to be connected through at least two 1000pF/2KV high-voltage capacitors, and the high-voltage capacitors need to be placed between the primary and secondary of the transformer and near the positions of screw holes.

Referring to fig. 16, in one embodiment, the baud rate of the first transmitting transformer 112 is 1062.5 MBd. The first transmitting transformer 112 has a wide band ranging from 40MHz to 1000 MHz. The first transmitting transformer 112 has a LuHy (minimum) of 3.75 uH. The maximum rise time and the maximum fall time of the first transmission transformer 112 are 0.3 ns. The dc resistance of the first transmission transformer 112 is 0.2 Ω. The minimum isolation of the first transmitting transformer 112 is 1500 Vrms. The first transmitting transformer 112 has a ratio of 1: 1. The maximum insertion loss of the first transmission transformer 112 is-2.0 @100 and 531 MHz.

In this embodiment, the first transmitting transformer 112, the first receiving transformer 122, the second receiving transformer 212 and the second transmitting transformer 222 are the same. The transformer operates at 1.0625Gbps and is capable of adapting to a differential 100 omega impedance shielded twisted pair. Specifically, the characteristics of the transformer are as shown in fig. 16.

Therefore, the FC-AE-1553 network system 100 can transmit a distance of 0m to 70 m at 1.0625Gbps rate by the driver electrical characteristic constraint setting, the equalizer electrical characteristic and index parameter constraint setting, the transmit signal and receive signal eye diagram constraint setting, the transformer electrical characteristic constraint setting of the transformer, the transformer electrical isolation setting in the PCB layout wiring, the high voltage capacitance placement of the chassis ground plane (GND _ EARTH) and the ground plane (GND), the chassis ground and PCB fixing screw holes, the connector metal shell, the structural chassis forming the complete plane shielding setting, and the shielding twisted pair setting in the above embodiments. Meanwhile, the FC-AE-1553 network system 100 adopts shielded twisted pair transmission, and the speed is up to 1.0625Gbps and is greater than the speed of MIL-STD-1553B.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An FC-AE-1553 network system, wherein the FC-AE-1553 network system comprises:

a plurality of network nodes, each of the network nodes comprising a first transmit link connector and a first receive link connector;

a switch connected to a plurality of the network nodes, the switch including a second receive link connector and a second transmit link connector;

the first transmitting link connector and the second receiving link connector are connected through a shielded twisted pair;

the first receiving link connector and the second sending link connector are connected through a shielded twisted pair.

2. The FC-AE-1553 network system of claim 1, wherein each said network node comprises a transmit side circuit comprising said first transmit link connector, a first transmit transformer, a first transmit driver, a first transmitter, a first auxiliary circuit, and a second auxiliary circuit;

a first transmitting end of the first transmitter is connected with a first end of the first auxiliary circuit, and a second end of the first auxiliary circuit is connected with a first input end of the first transmitting driver;

a second transmitting end of the first transmitter is connected with a third end of the first auxiliary circuit, and a fourth end of the first auxiliary circuit is connected with a second input end of the first transmitting driver;

the first auxiliary circuit is used for realizing alternating current coupling between the first transmitter and the first transmission driver and realizing input interface level matching of the first transmission driver;

a first output end of the first transmission driver is connected with a first end of the second auxiliary circuit, and a second end of the second auxiliary circuit is connected with a first input end of the first transmission transformer;

a second output end of the first transmitting driver is connected with a third end of the second auxiliary circuit, and a fourth end of the second auxiliary circuit is connected with a second input end of the first transmitting transformer;

the second auxiliary circuit is used for realizing alternating current coupling between the first transmission transformer and the first transmission driver and realizing level matching of an output interface of the first transmission driver;

a first output terminal of the first transmission transformer is connected to a first input terminal of the first transmission link connector, and a second output terminal of the first transmission transformer is connected to a second input terminal of the first transmission link connector.

3. The FC-AE-1553 network system of claim 2, wherein said first auxiliary circuit comprises:

one end of the first transmitting capacitor is connected with the first transmitting end of the first transmitter, and the other end of the first transmitting capacitor is connected with the first input end of the first transmitting driver;

one end of the second transmitting capacitor is connected with the second transmitting end of the first transmitter, and the other end of the second transmitting capacitor is connected with the second input end of the first transmitting driver;

one end of the first sending resistor is connected with a power supply, and the other end of the first sending resistor is connected with a first input end of the first sending driver;

one end of the second sending resistor is connected with a power supply (VCC), and the other end of the second sending resistor is connected with the second input end of the first sending driver;

one end of the third sending resistor is connected with the first input end of the first sending driver, and the other end of the third sending resistor is grounded;

and one end of the fourth sending resistor is connected with the second input end of the first sending driver, and the other end of the fourth sending resistor is grounded.

4. The FC-AE-1553 network system of claim 2, wherein said second auxiliary circuit comprises:

one end of the third transmitting capacitor is connected with the first output end of the first transmitting driver, and the other end of the third transmitting capacitor is connected with the first input end of the first transmitting transformer;

one end of the fourth transmitting capacitor is connected with the second output end of the first transmitting driver, and the other end of the fourth transmitting capacitor is connected with the second input end of the first transmitting transformer;

one end of the fifth sending resistor is connected with the first output end of the first sending driver, and the other end of the fifth sending resistor is grounded;

and one end of the sixth sending resistor is connected with the second output end of the first sending driver, and the other end of the sixth sending resistor is grounded.

5. The FC-AE-1553 network system of claim 2, wherein each said network node comprises a receive side circuit comprising said first receive link connector, a first receive transformer, a first receive equalizer, a first receiver, a third auxiliary circuit, and a fourth auxiliary circuit;

a first output end of the first receiving link connector is connected with a first input end of the first receiving transformer, and a second output end of the first receiving link connector is connected with a second input end of the first receiving transformer;

a first output end of the first receiving transformer is connected with a first end of the fourth auxiliary circuit, and a second end of the fourth auxiliary circuit is connected with a first input end of the first receiving equalizer;

a second output end of the first receiving transformer is connected with a third end of the fourth auxiliary circuit, and a fourth end of the fourth auxiliary circuit is connected with a second input end of the first receiving equalizer;

the fourth auxiliary circuit is used for alternating current coupling between the first receiving transformer and the first receiving equalizer;

a first output end of the first receiving equalizer is connected with a first end of the third auxiliary circuit, and a second end of the third auxiliary circuit is connected with a first receiving end of the first receiver;

a second output end of the first receiving equalizer is connected with a third end of the third auxiliary circuit, and a fourth end of the third auxiliary circuit is connected with a second receiving end of the first receiver;

the third auxiliary circuit is used for matching the alternating current coupling between the first receiving equalizer and the first receiver with the output interface level of the first receiving equalizer.

6. The FC-AE-1553 network system of claim 5, wherein the third auxiliary circuit comprises:

one end of the first receiving capacitor is connected with a first receiving end of the first receiver, and the other end of the first receiving capacitor is connected with a first output end of the first receiving equalizer;

one end of the second receiving capacitor is connected with a second receiving end of the first receiver, and the other end of the second receiving capacitor is connected with a second output end of the first receiving equalizer;

one end of the first receiving resistor is connected with the first output end of the first receiving equalizer, and the other end of the first receiving resistor is grounded;

one end of the second receiving resistor is connected with the second output end of the first receiving equalizer, and the other end of the second receiving resistor is grounded;

the fourth auxiliary circuit includes:

one end of the third receiving capacitor is connected with the first input end of the first receiving equalizer, and the other end of the third receiving capacitor is connected with the first output end of the first receiving transformer;

and one end of the third receiving capacitor is connected with the second input end of the first receiving equalizer, and the other end of the third receiving capacitor is connected with the second output end of the first receiving transformer.

7. The FC-AE-1553 network system of claim 5, wherein an output swing of the first transmitter ranges from 800mV to 1200mV, and an output common mode level of the first transmitter ranges from 900mV to 1000 mV;

the input swing of the first receiver ranges from 150mV to 1200mV, and the input common mode level of the first receiver ranges from 750mV to 850 mV;

the output level of the first transmission driver ranges from 1100mV to 2000mV, and the time range of the output level rising and the level falling ranges from 100ps to 510 ps.

8. The FC-AE-1553 network system of claim 1, wherein the transmit channel signals in the shielded twisted pair are transmitted according to a transmit signal eye pattern template, and the receive channel signals in the shielded twisted pair are received according to a receive signal eye pattern template.

9. The FC-AE-1553 network system of claim 2, wherein an isolation strip is disposed between the primary and secondary windings of the first transmitting transformer;

wherein a primary coil of the first transmit transformer forms a chassis ground plane with the first transmit link connector, a secondary coil of the first transmit transformer, the first transmitter, and the first transmit driver form a digital ground plane;

and the plurality of high-voltage capacitors are arranged between the primary coil and the secondary coil and used for connecting the shell ground plane and the digital ground plane through the plurality of high-voltage capacitors.

10. The FC-AE-1553 network system of claim 1, wherein pin remnant heights of the first transmit link connector, the first receive link connector, the second receive link connector, and the second transmit link connector are less than 1 mm.