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TIA/EIA-568-B
 TIA568A
  TIA/EIA-568-B

 TIA568B
Medium Dependent Interface
1000BASE-T
1000BASE-T

BI_DA+
BI_DA -
BI_DB+
BI_DC+
BI_DC -
BI_DB -
BI_DD+
BI_DD -
1000BASE-T

BI_DA+                 BI_DB+
BI_DA -                BI_DB -
BI_DB+                 BI_DA+
BI_DC+                 BI_DD+
BI_DC -                BI_DD -
BI_DB -                BI_DA -
BI_DD+                 BI_DC+
BI_DD -                BI_DC -
Construction and Use of a
Passive Ethernet Tap
パッシブタップの製作

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パッシブタップの製作

Notas del editor

  1. IEEE802.3 (Ethernet の規格)とはちゃう 割り当てているツイストペアの色違いということ
  2. IEEE802.3 のdefinition ハブのプラグの上に “X” と表示されているのを見たことありませんか?
  3. このクロスは 568A/B と符合している
  4. このクロスは 568A/B と符合している
  5. TIA568A/B
  6. 1000BASE-TX だと 4-8, 5-7, 7-5, 8-4 も交叉する
  7. 1000BASE-TX だと 4-8, 5-7, 7-5, 8-4 も交叉する
  8. 1000BASE-TX だと 4-8, 5-7, 7-5, 8-4 も交叉する
  9. 松下電工 2,898.- PANDUIT 3,643.- 日本国内で購入可能なこと インパクトツールなどの特殊工具が不要なこと
  10. 蓋をずらすだけで筐体を開けられる シャッター付き
  11. ひとまわりコンパクト ケースを開けるには、ドライバが必要 ジャック保護の蓋が 2 枚付属しているのでタップとしては問題無し
  12. どちらもジャックモジュールがローゼット本体にスナップインされています
  13. 松下電工の蓋は簡易工具を兼ねて居る PANDUIT は蓋をスナップインして圧着する 三和電気工業は「参考出品」 MDF に使っている規格の端子なので、本来配線はしやすいはず 今回は4口ローゼットが入手できなかったのと…次のスライド
  14. 松下電工…よじりの一部を戻して溝にはめ込み、蓋の簡易工具で押し込んでケーブルを固定する PANDUIT…よじりを完全に戻し、蓋の溝と穴に通す 競馬のゲートイン的難しさあり
  15. とりあえずケーブルの状態を残して配線してみた スナップインする蓋には溝の控えがあるので、上部に結線を引き出せる
  16. 蓋にワイヤを通し縒りを戻す
  17. なるべく経路長をそろえることと作業の便を考えて、結束バンドで 束ねてから蓋にワイヤを通す 結局最後に両端を結束バンドで結ぶ方がベターじゃないかと
  18. 余ったワイヤは、ニッパで切り落とす スナップインには相当力が必要。『カチン』という音がして、爪が プラグ本体にしっかり引っかかるまで圧力をかけないとだめ…圧着ペンチを手動でやるこころ
  19. PANDUIT のアプローチだとかなり経路が長くなってしまう 使っているピンがプラグ正面右側に集中していることに注目
  20. このように MDF 端子板的な結線が可能 却って専用工具を使わない方が自由度が高い
  21. 結線の様子を見ることができるように、蓋をしていません
  22. 縒りを一部戻して蓋に通してから再度縒りをつければ、蓋をくるくる回して移動することが できます
  23. PC とプリンタの間にタップを入れて、別の PC で監視します
  24. 五回ずつ ping を打っていますが、ちゃんと echo request / echo reply として見えてます
  25. 松下 2,898.- PANDUIT 3,643.- 専用工具不要…失敗してもリトライができます