Apr 24
aside
rest of term
- presentations next Tues
- final project due one week from Fri
- several of you have many missing homeworks
Any questions and/or discussion of your projects?
last topic(s)
Things we could discuss this week to finish up:
mobile internet & voice
Old-style telephones
- What is their technology?
- What is their bandwidth?
Internet-era phones and phone-like systems
- voice over IP : e.g. skype, google voice
- mobile phones : technology? bandwidth?
- text messages & SMS : what? why? over what medium?
Technologies:
What is your experience?
Frequency tradeoffs: distance vs bandwidth vs legality & power
- wifi: 2.4GHz (wavelength?)
- wimax : longer range; currently uncommon
Mesh networking
css for mobile
Two choices :
// in one .css file :
@media screen {
// put stuff here
}
@media print {
}
@media handheld {
}
Or completely different .css files
<!-- in .html -->
<link rel="stylesheet" media="handlheld" href="mobile.css">
<link rel="stylesheet" media="screen" href="screen.css">
tracing packets
network backbone, e.g. Level(3)
Play around with "ping" and "traceroute" to see
- round trip times over the internet
- where the packets go in between
Also talked about the command line program nmap
from nmap.org and detecting which services are
running on a given computer.
multimedia
images, sound, video : file types, sizes, editing ...
![[paper clip]](/courses/source/wiki_images/paper_clip_tilt.png)
name last modified size