Name:

Homework #2 - CSIS 625 - Spring 2002 - Oelke
Due Week 6 (March 5, 2002) 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) Statistical TDM: 
2) FDM: 
3) Hamming Distance: 
4) FEC: 
5) Busy Hour:
6) Erlang:
7) Parity Bit:
8) CRC:
9) WDM:
10) T1:


Short Answer:
11) How many trunks lines are needed to support 1000 Homes? 
Given - 1.8 phones per home average. Blocking Factor of 1%.
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. 

12) Compare the use of CRC-8 and BIP-8 for error detection.  
Which gives better detection of bit errors, of large and small burst errors and why?
If the system is transmitting real-time data which can not be retransmitted which is better and why?
If the system can retransmit a block of data which is better and why?


13) Given a tranmission line that is running at 1.544Mbps.  
A BIP-8 check code is inserted every 1000 bytes. 
Over the course of 1 minute, the BIP-8 checker detects 10000 parity errors.
What is the BER of that line?
Show all work and document all assumptions.