# Sudhanshu and group-
- How is attenuation related to wavelength?
- How does optical fiber inhibit tapping?
- What is skin effect in coaxial cable?
# Reza and group-
- What is meant by filtering of packets?
- Whats the use of colorized packets based on filters?
# Members-
- Sourav
- Renuka
- Siddesh
- Masoud
4 comments:
A-3.The skin effect in the coaxial cable is the tendency of an alternating electric current (AC) to distribute itself within a conductor so that the current density near the surface of the conductor is greater than that at its core. That is, the electric current tends to flow at the "skin" of the conductor. The skin effect causes the effective resistance of the conductor to increase with the frequency of the current. Skin effect is due to eddy currents set up by the ac current.BY SHIVAM DUBEY(SUDHANSHU TEAM)CC19.
A2-
Fiber tapping is a method to extract signal from an optical fiber without breaking the connection. Tapping of optical fiber allows diverting some of the signal being transmitted in the core of the fiber into another fiber or a detector. Fiber to the home (FTTH) systems use splitters to allow many users to share one backbone fiber connecting to a central office, cutting the cost of each connection to the home. Test equipment can simply put a bend in the fiber and extract sufficient light to identify a fiber or determine if a signal is present.
Similar techniques can be used to surreptitiously tap fiber for surveillance, although this is rarely done since all electronic equipment used in telecommunications is required to allow access to any phone line for tapping by legal authorization. Tapping the fiber means that all signals from every communications source being routed through the fiber are presented and must be sorted for relevant data, an immense task when thousands of sources of data or voice may be present.BY SHIVAM DUBEY(SUDHANSHU TEAM)CC19.
A1-An optical fibre amplifier having a selected gain spectrum comprising:an optical amplifier having a gain spectrum over a range of wavelengths and a filter with a selected attenuation versus wavelength characteristic over said range of wavelengths in which the filter extends in a generally linear manner,
the filter having a non-uniform physical structure therealong so that the wavelength of radiation which the filter attenuates varies continuously and non-uniformly from a first part of the filter which attenuates a first wavelength to a second part, spaced from the first part, which attenuates a second wavelength, the first and second wavelengths defining the range of wavelengths,the filter being arranged so that the degree of attenuation varies in a selected non-uniform manner from said first part to said second part to provide said attenuation versus wavelength characteristic,said attenuation versus wavelength characteristic being selected with respect to said gain spectrum of said optical amplifier to provide said selected gain spectrum of said optical fibre amplifier.BY SHIVAM DUBEY(SUDHANSHU TEAM)CC19.
filtering of packet means when you want just observe special packet such as udp , tcp , telnet and other type of packet you can use filtering option and just select the special packet type or protocol type or ip address . then in capturing just show the that type of packet .
colorized packet use for emphasize on special packet type for example you chose the tcp packet as red color then all tcp packet which send and receive through the network show as red color and other color use for other type of packet respectively .
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