時(shí)間:2023-03-25 14:58:02 | 來源:營銷百科
時(shí)間:2023-03-25 14:58:02 來源:營銷百科
網(wǎng)絡(luò)工程師考試級(jí)別:ISDN,which stands for Integrated Services Digital Network, is a system of digital phone connections, which has been available for over a decade.This system allows data to be transmitted simultaneously across the world using (1) digital connectivity.With ISDN,voice and data are carried by bearer channels occupying a bandwith of (2) (bits per second).Some switches limit B channels to capacity of 56 Kbps.A data channel (3) handles signaling at 16Kbps or 64Kbps,depending on (4) .Note that,in ISDN terminology,'k' means (5),and not 1024(2^10) as in many computer applications;therefore,a 64Kbps channel carries data at a rate of 64000bps. A new set of standard prefixes has recently been created to handle this. Under this scheme,'K'(Kilo) means 1000(10^3),'M' (Mega) means 1000000(10^6),and soon ,and 'Ki'(Kibi) means 1024 (2^10),'Mi' (Mebi) means 1048576(2^20).and soon。關(guān)鍵詞:級(jí)別,考試,工程師,網(wǎng)絡(luò)
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