EE450-Discussion2-Fall10

EE450-Discussion2-Fall10 - EE:450Computer Networks...

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1 EE:450 – Computer  Networks Discussion Session #1 September 1, Fall 2010 
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2 Some Terminology Bit (b) Basic unit of information in computers Binary : 0 or 1 Byte (B) 8 bits in one byte Bit Rate Number of bits transmitted in a time unit Typical unit is  bits-per-second (bps) Used to measure transmission speed in digital  transmissions
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3 Terminology continued… 1K Bytes = 2 10  Bytes = 1024 Bytes =  8192 bits Similarly, 1M Bytes = 2 20  Bytes However , 1 Kbps ≠ 2 10  bps 1 Kbps = 1000 bps Similarly, 1 Mbps = 10 6  bps In this course, the approximation 1KB ~ 1000 Bytes is always  allowed
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4 Terminology Delay/Latency : Time it takes a message to  travel from one end of a link to another It is a very important  performance parameter End to End delay consists of several  components Transmission time  Propagation delay Nodal Processing time Queuing delay
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5 Transmission time How long does it take to transmit a  message (usually in KB) over a link with  bit rate (usually in Mbps)? Steps: 1. Convert message size to bits 1KB = 1024 bytes 1MB = 2 20  bytes 1 Byte = 8 bits Key is the difference between “ B ” and “ b
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6 Examples
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7 Transmission time ctd. 2. To obtain the transmission time, divide  the message size (in bits) by the bit rate  a.k.a. bandwidth (in bps) Transmission time = Message size/Bit rate
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8 Transmission time example  Ex : How long does it take to transmit a 4KB file  over a link with 1Mbps bandwidth? Solution Step 1: Convert the file size to bits 4 KB = 4 x 1024 Bytes = 4096 Bytes       = 32768 bits 1Mbps = 10   6  bps Step 2: Transmission Time = file size / bandwidth t trans  = 32768 bits / 10 6  bps         = 32.8 ms
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Propagation delay Propagation delay : The time it takes for a bit  to traverse from one end of the link to the  other end t prop  = Link length (m) / V prop  (m/s)
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This note was uploaded on 10/01/2010 for the course EE 450 taught by Professor Zahid during the Fall '06 term at USC.

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EE450-Discussion2-Fall10 - EE:450Computer Networks...

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