1. Which of the following is true about a TCP/IP network? a. The network uses only standards defined in TCP/IP RFCs. b.
Use short answers to explain the difference between: 1. Synchronous and asynchronous Synchronous and asynchronous describe how data bits are transmitted and received particularly when discussing modems. Asynchronous communication refers to a communication method that is not dependant on particular timing scheme. The sending modem transmits each data bye into ones and zeros using start and stop bits to differentiate between the data bytes. The receiving modem uses the start and stop bytes to interpret the different data bytes.
Crosstalk - Undesired transfer of signals between communication channels. Waveguides - An electromagnetic feed line used in microwave communications. FTTH - “Fiber to the Home”, means that delivery of communication signal over fiber from the operator’s switch to a home or business. Simplex - A communication mode where only one signal is transmitted and always goes the same direction. Half-Duplex - A communication mode where data can be transmitted both directions on a signal carrier but not at the same time.
Some newer landline phones can use what is called a NCID (Network Caller ID) which uses data sent over a TCP connection. SMS/Text Messaging – The SMS (Short Message Service) can be used in a variety of ways. Some examples include: cellular phones, GPRS systems, and web texting. SMS does not use any kind of voice technology and therefore is sent over data networks. Fax Machines – Fax machines contain analog modems.
3. P2 only has an input without outputs. 9. Answer: 1. P1.4.2 has outputs but no inputs 2.
See signal-to-noise ratio. Fundamental physical limits such as the shot noise in components limits the resolution of analogue signals. In digital electronics additional precision is obtained by using additional digits to represent the signal; the practical limit in the number of digits is determined by the performance of the analogue-to-digital converter (ADC), since digital operations can usually be performed without loss of precision. The ADC takes an analogue signal and changes into a series of binary numbers. The ADC may be used in simple digital display devices e. g. thermometers, light meters but it may also be used in digital sound recording and in data acquisition.
Each manufacturer puts a unique code into the first 3 bytes of the address. C. each manufacturer puts a unique code into the first half of the address. E. the part of the address that holds this manufacturer’s code is called the OUI 11. C. it resides in the Ethernet trailer, not the Ethernet header. Chapter 3 review questions 1.
86. ANS: The wavelength decreases; the amplitude and speed are not affected. 87. ANS: Light undergoes refraction, diffraction, and interference like all waves. Its energy depends on frequency, which is how a particle behaves.
Encoding a signal for transmission permits the switching of an analog signal into a digital signal. A Codec converts an analog signal to a digital one for transmission over a data network (Goleniewski, 2007). There are various types of Codec (coder-decoder) to apply an analog-to-digital conversion. DIGITAL/ANALOG CONVERSION Modems (modulator-demodulator) convert digital signals into analog signals. There are different ways in which a modem converts digital signals into analog signals.
C. What are the ways we communicate? 1. Verbal Communication: a. Spoken words 2. Non Verbal Communication: a.