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Basic components II (06.523)

Basic components II (06.523). Basic components of communication networks II Lecture 2. Network layers. Application layer Network layer Data link layer Physical layer. Application layer. HTTP POP. Network layer. TCP IPX EBUI. Data link layer. 802.3 PPP Z-Modem. Physical layer.

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Basic components II (06.523)

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  1. Basic components II (06.523) Basic components of communication networks II Lecture 2

  2. Network layers • Application layer • Network layer • Data link layer • Physical layer

  3. Application layer • HTTP • POP

  4. Network layer • TCP • IPX • EBUI

  5. Data link layer • 802.3 • PPP • Z-Modem

  6. Physical layer • RS-232C cables (serial) • IEEE 802.3 category 5 • V.34 Modem

  7. bits/sec =bandwidth log 2 (1 +S/N)bits/sec = 2600 Hz * log 2 (1 + 30dB)bits/sec = 26k In Wellington you can get 28.8k, in Hawke’s Bay, 19.2k 33k assumes digital telephone network 56k assumes ISP physically at telephone network -- no modem Higher rates through compression. I have got 120k Shannon’s law

  8. Three ways to encode information + baud rate Amplitude modulation Frequency modulation Phase modulation Modem theory

  9. Modems use v42 for data compression v42 is the same compression standard as used in GIFsworks by sending 5*1, 2*0, etc. Data compression

  10. 802.3, 802.5, 802.11 10baseT, 10base 2 Appletalk, Ethertalk Incompatible protocols LAN networking

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