ข้อมูลสัญลักษณ์จำแนกการออกแบบผลิตภัณฑ์ระหว่างประเทศ


รหัส / code คำอธิบาย / code name Version
H04B0003380000 for signals in two different frequency ranges transmitted in opposite directions over the same transmission path 1
H04B0003400000 Artificial lines; Networks simulating a line of certain length 1
H04B0003420000 Circuits for by-passing of ringing signals 1
H04B0003440000 Arrangements for feeding power to a repeater along the transmission line 1
H04B0003460000 Monitoring; Testing 1
H04B0003462000 Testing group delay or phase shift, e.g. timing jitter 1
H04B0003466000 Testing attenuation in combination with at least one of group delay and phase shift 1
H04B0003480000 Testing attenuation (H04B0003466000 takes precedence);; 1
H04B0003487000 Testing crosstalk effects 1
H04B0003493000 Testing echo effects or singing 1
H04B0003500000 Systems for transmission between fixed stations via two-conductor transmission lines(H04B0003540000 takes precedence);; 1
H04B0003520000 Systems for transmission between fixed stations ; via waveguides 1
H04B0003540000 Systems for transmission via power distribution lines(in alarm signalling systems G08B0025060000) 1
H04B0003560000 Circuits for coupling, blocking, or by-passing of signals 1
H04B0003580000 Repeater circuits 1