Name:

Homework #2 - CSIS 625 - Fall 2001 - Oelke
Due Week 5 (Oct 8, 2001) by classtime

Instructions: Email this document with your answers filled in to droelke@stthomas.edu
Put the text as unformatted text in the body of your message, not as an attachment.


Define the following:
1) Serial Transmission: 
2) Parallel Transmission: 
3) DTE: 
4) DCE: 
5) Dispersion: 
6) Statistical TDM: 
7) FDM: 
8) Hamming Distance: 
9) FEC: 


Short Answer:
10) Explain why bit stuffing is used.  Hint - there are at least 2 different reasons and I expect two.

11) Why is twisted pair cabling preferred over non-twisted cabling? 

12) What are the benefits and costs of twisted pair cabling? 

13) How many trunks lines are needed to support 1000 Homes? 
Given - 1.8 phones per home average. Busy hour is 3 CCS for the first line in a home, and 2.3 CCS for the second line. Use Erlang B. Show all work and include reference to which online calculator you use. 

14) Compare the use of CRC's and BIP-8 for error detection. 

15) CD's use a RS(32,28) error correcting code. What is the biggest burst of errors (in bits) that can be corrected? 

16) Explain what dispersion is in a fiber optic system.  Choose one type of dispersion and explain a way to compensate for it.