Up to date, router testing has been employing the Transverse Test Method (TTM) defined by ISO for testing a pair of ports. Extension of two-port test method to multi-port testing needs methodology extension for lack of synchronization mechanism in TTM. For the very reason, Sichuan Network Communication Technology Key Laboratory introduced a new test method called MPC-TTM (Multi-Port Concurrent Transverse Test Method), which explicitly demands synchronization mechanisms.
迄今为止,ISO规定的路由器测试方法中,“穿越测试法”(TTM-Transverse Test Method)仅限于对一对端口进行测试,而将该法扩展到多端口测试环境时,缺少端口间测试过程的同步协调机制,因此,四川省网络通信技术重点实验室提出了“多端口并发穿越测试法”(MPC-TTM-Multi-Port Concurrent Transverse Test Method)。
Furthermore, paper dissertates the key techniques of input and output ports design, processing of IP packers by analysis of the difficulties in the design.
The optimized results are shown as follows: the inner diameter of bent circular waveguide is 7.0cm, the axial distance between the above two ports is 8.03cm, and the axial length is 15.11cm, The overall power conversion efficiency exceeds 90% in the frequency range from 3.41 to 3.74GHz, with its value up to 95.6% at 3.60GHz, the power capacity exceeds 2.00GW.
With the considering of higher-order modes coupling and the power attenuation of the straight circular copper waveguide, the overall power conversion efficiency is 93.8% at 3.75GHz when the inner diameter is 9.0cm and the axial distance between the above two ports is up to 10.57m.
A principle of designing realizable precision interfaces between sensors and digital ports of microcontrollers and microconverters which enable one not only to measure a physical variable but also to estimate its derivative was proposed.
The sensor is inserted in a vacuum chamber; the rotating mechanism of the sensor and location of the ports in the facility enables measurements along the plasma column.
It is proposed that the compact neutron cameras be placed inside the shielding blocks located in the equatorial (nine collimators) and diverter diagnostic (seven collimators) ITER ports.
The expressions for noise figure F, noise measure M and their minimum values of linear two—ports network are synthesized and computed in this paper. The G_a—contour and M—contour curves in the G_s—B_s planes are drawn. The expression of the F—contour in the G_s—B_s planes is derived and the F—contour curve is drawn. The measurement method for noise parameters is given.
The different topological structures and protocols which may be used in local area integrated services networks have been considered and compared. The special advantagies of BUS structure over the others have been found during the discussion. The amount of control information of unidirectional protocol, the FASNET, has been proved the mininum. The network interface port, including both hardware and software, of FASNET and the communication experiment among three terminals (telephones and microcomputers) usi...
: A circularly polarized (CP) two ports microstrip antenna simultaneously operated at two CP states is designed. The CP bandwidth of the antenna is increased from 0.35% to about 5%, but the antenna directivity due to the loss in the load is reduced by about 3dB. It is believed that such an advantageous trade-off for both will make this type of antenna much more usefulness, for example, in transmitting or receiving two CP waves of opposite senses simultaneously. The "crosstalk" between the two ports...