- published: 23 Mar 2010
- views: 56623
Digital subscriber line (DSL, originally digital subscriber loop) is a family of technologies that provide internet access by transmitting digital data over the wires of a local telephone network. In telecommunications marketing, the term DSL is widely understood to mean Asymmetric Digital Subscriber Line (ADSL), the most commonly installed DSL technology. DSL service is delivered simultaneously with wired telephone service on the same telephone line. This is possible because DSL uses higher frequency bands for data separated by filtering. On the customer premises, a DSL filter on each outlet removes the high frequency interference, to enable simultaneous use of the telephone and data.
The data bit rate of consumer DSL services typically ranges from 256 kbit/s to 40 Mbit/s in the direction to the customer (downstream), depending on DSL technology, line conditions, and service-level implementation. In ADSL, the data throughput in the upstream direction, (the direction to the service provider) is lower, hence the designation of asymmetric service. In Symmetric Digital Subscriber Line (SDSL) services, the downstream and upstream data rates are equal.
What would you do if the world all turned grey?
All the pretty colours packed their bags and went away.
Well now let me tell you,
I know lots that we can do,
To keep the grass nice and green,
And the oceans deep deep blue.
How would you feel if the birds left the sky?
Tigers turned tail and the fish all waved goodbye.
I'm sure I'm just like you,
And if everyday we leave the world a much cleaner place,
We'll have sweeter air to breathe.
What? Try and save some rain water
Why? You can use the water again
How? Water the flowers and plants with the rain water
When? Everyday
Look for the thing you and do everyday.
Some things seem small but they're big in their own way.
Use a little less of some things,
And some things again if that's OK.
And cycle through a land that's filled.
Recycle through a land that's filled,