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有的,只是要看產品規格屬性有無定義! I. R. U$ G9 ^) g, v9 J0 U+ B
其中,最主要的乃是eye diagram的定義
3 v0 t3 z- _0 v0 i8 B s: _像SATA, or USB就有明確定義TX的 ...
/ {9 N" M& B/ \* b' c7 o/ Z2 C+ ~finster 發表於 2009-11-26 09:26 PM
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5 X' U. N6 d. Y/ S" ~& t; Y聽版主你這麼說,我是可以藉由欲接受我方TX的RX端之規格,去推算TX端的合理範圍囉?! \ H$ T6 `) J2 o. q. G. x( C
因為規格上沒有定義關於jitter方面的限制。* O) m( I5 y5 M, i8 @
以下是對方rx的定義
" A4 B% p C1 E0 ~2 f' ~總頻寬3MHz,子頻寬300kHz
* m C l- q. }( u. bProgrammer / Controller Unit
1 A0 P% U7 A! ~ c5 HReceiver noise bandwidth 200 kHz * Y- D. R& [* [/ @) z; F1 t
Antenna Gain Tx/Rx 2 dBi 0 d; N/ Y- r x$ a4 w- g1 t1 O
Power Into Antenna -22 dBm
0 W7 Y3 g$ k- Y# Q8 b" {$ cTx Power -20 dBm EIRP - M3 Z1 V" |- ~% R7 D& i0 k
Required SNR 14 dB % P$ k) B/ d& W1 K' D
Noise Floor -101 dBm
$ `2 C7 F* p( Y; t7 QAmbient noise at receiver input 20 dB above kTB
l5 X, t& f* v# J) s! z8 ?Receiver noise figure 4 dB
" X% I3 x4 H% P+ }) o跟傳輸上的耗損
, s5 j1 m8 p! {# K1 G6 p) ETransmission Losses
* V! i! a( s6 W/ q7 N- ]3 ?Free space loss at 2 meters 30.5 dB ) T, L, b9 h& Y; E
Fade margin (with diversity) 10 dB
( ]1 N [& Z* |( n% o* R* RExcess loss (polarisation, etc.) 15 dB : a; X% z- ^ c1 w" l$ S) Z
Building penetration loss 20 dB |
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