четверг, 8 ноября 2012 г.

Вопросы к контрольной, которая состоится 10 ноября в группах ТЕ-4.01 и ТЕ-4.02


1) Which topology is used in PON - P2P or P2MP?
2) Decipher abbreviations FTTH and FTTB. What is difference between FTTH and FTTB?
3) Write list of main fixed broadband access technologies according to Point Topic classification.
4) What is leading broadband access technology (in number of broadband access lines in the world)?
5) What is maximum achieved bit rate for dial-up V.90 protocol?
6) Decipher abbreviation VDSL2. What is maximum achieved bit rate for VDSL2 technology?
7) What is reason of very high bit rate for VDSL2 technology as compared with the bit rate for V.90 protocol?
8) What is channel capacity? Can be maximum achieved bit rate for some telecommunication technology more than channel capacity?
9) Channel capacity calculation based on known channel bandwidth and known signal to noise ratio.
10) Channel bandwidth calculation based on known channel capacity and known signal to noise ratio.
11) Decipher abbreviation SHDSL. What is maximum bit rate achieved on one pair for SHDSL technology?
12) What is maximum number of used pairs for SHDSL technology?
13) What are modulation types used for HDSL technology? What is modulation type used for SHDSL technology?
14) Decipher abbreviations 2B1Q, PAM.
15) What is signal constellation? Draw the signal constellation for 2B1Q and PAM-16 modulations.
16) The sequence of digital symbols is done, for example 00101100.  Draw the graph of corresponding 2B1Q signal.
17) The sequence of digital symbols is done, for example 000111110010. Draw the graph of corresponding PAM-16 signal.
18) What is maximum bit rate achieved for ADSL2, ADSL2+ technologies? What is maximum frequency used for these technologies?
19) What is modulation type used for ADSL, ADSL2, ADSL2+, VDSL, VDSL2 technologies?