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10 Tips To Select The Best VoIP Provider
Once you have decided to use VoIP services, the next step is to select the VoIP provider who suits your needs the best and offers you hassle-free service at a good price. If you look around in the market, you’ll find various providers who offer...
Five Reasons To Buy VoIP
Believe it or not, there are still a few people out there who just don't get it when it comes to VoIP. With services like Skype, or Google Talk, it is easy to confuse what a true VoIP plan really is. Skype, Google Talk, and the like would be...
Gotta Know Now Software Watches Web Pages For You
Too many days I found myself constantly checking the same financial news web pages for any news about the companies I was currently invested in. Between clicking on these web pages and constantly clicking on other financial web ...
Unlimited Bandwidth in Web Hosting
Bandwidth explained: Bandwidth is the amount of data transfer that you are allowed to have for a hosting package i.e. Let’s say you have a web page that is 48KB in size, now each time a user opens your site and goes to that page S/he downloads 48...
What is broadband?
Defining broadband can get complicated There are many different takes on how to actually define the word: broadband. The first and most obvious way to define it is a transmission medium that allows for multiple pathways and types of data, far...
 
Some DSL Broadband definitions

Some DSL Broadband definitions,

Often too many people get confused with all the definitions, here we have explained in easy to understand terms.

ADSL:
Asymmetric Digital Subscriber Line - asymmetric meaning it's faster downstream than upstream.

ASAM:
Advanced Services Access Manager -Whether you have a DSLAM or ASAM in your exchange doesn't really matter. They do the same thing. See DSLAM's as well.

ATM:
Asynchronous Transfer Mode - a method of encapsulation which is capable of many virtual circuits. With these, providers (ISP's) can split an ATM connection (155Mbit or 622Mbit) up into many connections. ATM isn't just used for DSL but in the case of DSL it's used to provision each customer.

Contention Ratios
A contention ratio is the number of users to xMbit of bandwidth. For example some providers offer 2Mbit DSL, with a ratio of 50:1, meaning 50 users to 1Mbit of bandwidth.

CPE
Customer Premises Equipment, the term that describes the equipment used on the customer end of a connection, for example your DSL modem/router, cable modem, black box on Wired Country etc.

DSL
Digital Subscriber Line.

DSLAM
Digital Subscriber Line Access Multiplexer - They are placed in DSL enabled Telecomm exchanges, when your modem syncs up and the DSL light comes on, it means you are connected. When data travels down your connection, it goes from the CPE -> DSLAM -> RAN -> ISP

ERX
Edge Routing Exchange. See RAN.

IPNet
Telecommunications backhaul networks for carrying traffic from the customer to the ISP,


i.e. carrying traffic from RAN's to ISP's.

Ping or Latency
A ping measures the time in milliseconds that it takes for a packet to travel from your computer to a remote computer and back to you again. Just because you can't ping a given host, quite a lot of providers are beginning to filter ICMP (pings come under this protocol) traffic because it is commonly used to attack hosts and wastes a lot of bandwidth.
Many providers also give low priority to ping (ICMP) traffic which may mean your ping at a command line isn't very good, but in say a game, things may be fine.

RAN
Regional Access Node These aggregates many DSLAM's connections and then feed the data to an ISP

RTT
Round Trip Time - the time it takes in milliseconds for a packet to go from A to B and back again. See ping.

SDSL
Symmetrical Digital Subscriber Line - symmetrical meaning the same speed up and down.

Units

There is a major difference between UPPER and lowercase

MB = MegaBytes
Mb = Megabits
kB = KiloBytes
kb = Kilobits

MB/s = MegaBytes per second
Mb/s = Megabits per second
kB/s = KiloBytes per second
kb/s = Kilobits per second

There is 8bits to a Byte, 8kb = 1kB

1Meg connections only transfer at 128kB/sec.
or an 8Mb connection only transfers at 1024kB/sec or 1MB/s
About the author:

Steve owner and operator
© Private Mail Services
http://www.private-services.com 2005 - helping to keep you anonymous

 

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