books ما هو null modem modem cable
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ما هو NULL MODEM – MODEM CABLE (Info)
1- عند توصيل جهازين من نوع DTE يلزم استخدام كيبل معكوس الأطراف وهو يلغى عمل جهاز الاتصال DCE ويسى أيضا MODEM ELIMINATOR .
2-عند توصيل جهاز طرفى رئيسى من نوع DTE مع جهاز رئيسى من نوع DCE نوصل كيبل مباشر بينهما .
