GB/T 47459-2026Communication specification for the payload network of a space station (English PDF)

1 Scope

This document specifies the space station payload network architecture, network protocol requirements, other communication requirements, and testing requirements.

This document applies to the design and testing of network terminals for space station payload networks (including wired Ethernet and wireless LAN).

4 Load Net Architecture

4.1 The Tianhe core module, Wentian experimental module, and Mengtian experimental module of the space station are all equipped with payload networks. A schematic diagram of the single-module payload network interface is shown in Figure 1. The lotus network architecture meets the following requirements.

a) In the combined configuration, the payload networks of each module are interconnected via 10 Gigabit fiber optic cables to form a unified network, providing on-orbit high-speed connectivity for network terminals.

Services include high-speed data transmission, high-speed data transmission between air and ground, and network management. The SSID of the wireless network inside and outside the cabin is the same.

b) The space station payload network mainly includes backbone switches, access switches, network manager, intravehicular radio transceivers, and extravehicular radio transceivers.

Products such as transceiver equipment. The quantity of access switches, in-cabin wireless transceiver equipment, and external wireless transceiver equipment in each cabin will be determined based on the actual situation in each cabin. The scale of the test load is determined.

4.2 The payload network provides network terminals with the following interface types. wired Ethernet interface and wireless LAN interface.

a) Wired Ethernet interface.

1) 10 Gigabit fiber optic interface;

2) Gigabit fiber optic interface;

3) 100M Ethernet interface.

b) Wireless LAN interface. 5.2GHz and 5.8GHz wireless LAN interfaces.

4.3 The relationship between the interface types provided by the payload network to the network end and the network protocol is shown in Table 1.

5 Network Protocol Requirements

6 Other communication requirements

The following requirements must be met when the space station payload network communicates.

a) The interval between sending ARP request packets should be no less than 1 second, and the ARP aging time setting on network terminals should be less than 270 seconds, preferably [missing information]. 180s;

b) If no response is received after sending 5 consecutive ARP messages, the sending of ARP messages should be stopped, and resending may be done after 180 seconds. ARP request message;

c) It is advisable to design self-protection measures to avoid the impact on oneself when other network terminals malfunction;

d) For network terminals designed for cold backup, the primary and backup products should use the same MAC address, IP address, subnet mask, and gateway. set up;

e) For network terminals designed with hot backup, the primary and backup products should preferably use adjacent IP addresses, the same subnet mask, and gateway settings;

f) When communicating with terrestrial network terminals, the UDP protocol should be used and flow control measures should be implemented to ensure that the communication rate does not exceed the limit. Allocated bandwidth;

g) When communicating with ground network terminals, fixed-length frames should be used to transmit network data. The length of the network data frame should be consistent with the length of the space station's ground-to-space link.

The transmission efficiency is highest when the effective data field length of the transmitted frame matches.

7 Test Requirements

7.1 Before uplinking or upgrading in-orbit, network terminals should complete network communication self-testing, information security access confirmation, and space station entry confirmation.

Only after all information interface tests are passed can the system be uploaded or upgraded in orbit and used within the space station.

7.2 Before the network terminal leaves the factory or is upgraded in orbit, a network communication self-test should be completed on the ground according to the following regulations.

a) Interface performance testing, including.

1) Wired network electrical interface negotiation rate;

2) Average optical power, saturation optical power, and receiver sensitivity of the wired network fiber optic interface;

3) Communication frequency, negotiation rate, etc. of wireless networks.

b) Network protocol testing, including.

1) ARP request message format check, ARP reply message format check, request message sending frequency test, ARP table maintenance. Time-of-use testing;

2) ICMP protocol testing;

3) UDP/TCP protocol format check.

c) Business testing, including.

1) Normal communication mode test;

2) Boundary value traversal test with configurable parameters;

3) Hardware and software failure mode testing.

d) Network security testing. Conduct relevant tests using virus scanning and detection tools.

7.3 The information security access confirmation process is divided into three stages. information security design and testing review, information security evaluation, and electrical space station testing.

Specifically, it should be carried out in accordance with the relevant requirements for the information security access confirmation work of the space station.

7.4 The information interface test for space station entry confirmation shall comply with the provisions of GB/T 47455.