The charter of IEEE 802.22, the Working Group on Wireless Regional Area Networks (“WRANs”), under the PAR approved by the IEEE-SA Standards Board is to develop a standard for a cognitive radio-based PHY/MAC/air_interface for use by license-exempt devices on a non-interfering basis in spectrum that is allocated to the TV Broadcast Service.
IEEE 802.22
IEEE 802.22 – Wikipedia, the free encyclopedia.
IEEE 802.22 is a standard for Wireless Regional Area Network (WRAN) using white spaces in the TV frequency spectrum.[1] The development of the IEEE 802.22 WRAN standard is aimed at using cognitive radio (CR) techniques to allow sharing of geographically unused spectrum allocated to the Television Broadcast Service, on a non-interfering basis, to bring broadband access to hard-to-reach, low population density areas, typical of rural environments, and is therefore timely and has the potential for a wide applicability worldwide. It is the first worldwide effort to define a standardized air interface based on CR techniques for the opportunistic use of TV bands on a non-interfering basis.
IEEE 802.22 WRANs are designed to operate in the TV broadcast bands while assuring that no harmful interference is caused to the incumbent operation, i.e., digital TV and analog TV broadcasting, and low power licensed devices such as wireless microphones.[2][3][4] The standard was expected to be finalized in Q1 2010, but was finally published in July 2011.[5]
‘Super Wi-Fi’: Super, But Not Wi-Fi
That’s in part because for now, at least, you can’t move a white-space device around. You can’t put a white-space radio into a phone or laptop because each white-space device must check its location against a database to determine which TV channels and wireless microphones are being used in the device’s area, so they can avoid those channels.
via ‘Super Wi-Fi’: Super, But Not Wi-Fi | News & Opinion | PCMag.com.
That may change a few years down the road, when “personal/portable” white space devices appear. Based on the 802.22 standard, these will be chips able to fit into laptops and tablets, with software that can “sense” clear frequencies as they move around.
Two LVM VolGroup’s, same name, one is system disk – what to do?
It’s a lot easier to rename the “old” volume group if the old drive is the only one connected to the system.
Using your first FC4 installation CD and with only the old drive installed, boot into rescue mode (boot: linux rescue), but don’t search for or mount the FC installation. At the command prompt, you will probably need to active the lvm like this:
lvm vgscan
lvm lvscan
lvm vgchange -a y
lvm pvscan
lvm lvscan
The last two commands should list your volume group(s) and logical volume(s). Now use vgrename to fix the problem:
lvm vgrename VolGroup00 whatever_you_want_to_call_it
Note that all lvm commands need to be preceded with “lvm” in rescue mode.
via Two LVM VolGroup’s, same name, one is system disk – what to do?.
Writing udev rules
Red Hat / CentOS: Swap / Change Ethernet Aliases
Red Hat / CentOS: Swap / Change Ethernet Aliases.
This didn’t work the first time I tried it and now it does. For some reason eth0 and eth1 get switched on the 64bit CentOS 5.7 build which causes routing problems. This can also be solved by fixing the static routes in /etc/rc.local. It bothered me to have these interfaces have different names depending on what OS is running. I think there’s also a way to force this in /etc/udev/ directory by adding a persistent-net rule file. It all works now.
BTW: I also changed /etc/sysconfig/hwconf but don’t think that had any effect.
Linux Network Configuration
This Linux tutorial covers TCP/IP networking, network administration and system configuration basics. Linux can support multiple network devices. The device names are numbered and begin at zero and count upwards. For example, a computer running two ethernet cards will have two devices labeled /dev/eth0 and /dev/eth1. Linux network configuration, management, monitoring and system tools are covered in this tutorial.
LivingSocial Now At 5,000 Employees, Half The Size Of Groupon
A few days ago, at the DLD conference, Groupon CEO Andrew Mason revealed that his three-year-old daily deal company now has 10,000 employees, with about 70 percent overseas. What about LivingSocial, the No. 2 daily deal company? Tim O’Shaughnessy told me yesterday the company is now at 5,000 employees worldwide, with “just under half” in the U.S.
via LivingSocial Now At 5,000 Employees, Half The Size Of Groupon | TechCrunch.
Bringing A Startup Together: FounderDating Launches Matching Site, Expands To NY, Boston, LA
So far, FounderDating has been going well. ”The more we talk to people, the more demand we see” Alter says. “Incubators are sending applicants to it who need cofounders, saying things like ‘come back when you have one.’” A couple examples of successful matches include the team behind Y Combinator-backed referral platform Curebit, and inventory matchmaking site Sorced (whose cofounder, Elizabeth Knopf, has a longer post about the experience over on Women 2.0)
WordPress Plugin Unblocks Censored Sites, Including The Pirate Bay
WordPress Plugin Unblocks Censored Sites, Including The Pirate Bay | TorrentFreak.
The plugin is developed by the hosting company Greenhost and allows everyone with a WordPress blog to start a proxy for sites that are censored elsewhere in the world. As an example, Greenhost have setup a Pirate Bay and Wikileaks proxy.