June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
Legacy Endpoints
|
79
Some service providers sell a service that they call wireless T1. Don’t
confuse this with actual T1 service from a phone company. Wireless
T1 doesn’t have anything to do with T1, it’s usually no good for VoIP,
and it doesn’t use T1 signaling. In fact, wireless T1 is usually just a
name ISPs give to a radio Ethernet bridge that provides a subscriber’s
data network access at roughly the same speed as a real T1 circuit.
Free-Space Optics
A relatively new development, free-space optical (FSO) uses light beams transmitted
over the open air, like a television remote control, to connect remote locations. Like
radio, FSO requires a line of sight and is subject to the same terrain challenges. Like
microwave radio antenna, FSO transmitters and receivers must be carefully kept in
alignment.
But unlike radio products, FSO links are capable of much higher data throughput
approaching 3 gbps. FSO’s range is limited to about a mile. Where radio is suscepti-
ble to RF interference, FSO is susceptible to light interference—especially from the
sun.
More information about metro area networking is available in “Metro Ethernet,”
available at O’Reilly’s Safari Bookshelf (http://safari.oreilly.com), and in O’Reilly’s
802.11 Wireless Networks: The Definitive Guide.
Legacy Endpoints
In conventional ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.