什么是SNR Margin？
什么是SNR Margin？
我不会看。。
帮我看看下，如何？
noise margin downstream: 39 db
output power upstream: 18 db
attenuation downstream: 19 db
carrier load: number of bits per symbol(tone)
tone 0- 31: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 32- 63: 00 00 00 00 00 00 00 00 02 22 33 44 44 55 55 55
tone 64- 95: 05 55 55 55 55 55 55 55 55 45 55 44 44 44 44 44
tone 96-127: 33 32 20 00 00 22 23 33 33 44 44 44 44 44 44 44
tone 128-159: 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33
tone 160-191: 32 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22
tone 192-223: 22 22 22 22 00 00 00 00 00 00 00 00 00 00 00 00
tone 224-255: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 256-287: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 288-319: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 320-351: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 352-383: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 384-415: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 416-447: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 448-479: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 480-511: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
