دانلود پاورپوینت ISDN
نوع فایل: power point
فرمت فایل: pptx
قابل ویرایش
تعداد اسلاید : 30 صفحه
قسمتی از پاورپوینت :
ISDN - Integrated Services Digital Network
Telephone services -> Telecommunication services
Used for voice, image and data
E - series for Telephone network and ISDN
I - series for ISDN concepts, aspects and interfaces
Layer 1 - Physical (2B1Q)
Layer 2 - Data Link (Q.920 - Q.923)
Layer 3 - Network (Q.930 - Q.939)
Types of channels
Bearer channel (B-channel=64 kb/s) clear pipe for data
Delta channel (D-channel, 16 kb/s or 64 kb/s) call signaling information:
who is calling
type of call
calling what number

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برچسب ها: download-PowerPoint-ISDN