Does Blackberry poll the server every fifteen minutes to update the information for the user?
Some say the Blackberry goes to the server every 15 minutes to check for any data in the email, this process is called ‘Polling’ and others reveal that the BlackBerry does not poll the server to look for updates. It simply waits for the bring up to date to arrive and notifies the user when it does. What is the right answer?
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The Blackberry, like every cell type of device polls. But it does not mean what you describe. The polling that takes place is a “keep-alive” type of data packet. The purpose is to let the network know where the buzz is located physically on the network at any given time. As a user moves from place to place the cell towers keep a record of those movements so that when you want to make a call or send data of any type you will by now be connected and ready go. This is how you get an “always on” connection.
The polling intervals vary by providers but they are commonly constant IE every so many seconds or nanoseconds.
If the network receives a piece of data destine for your device, the network sends the data immediately after it arrives. The network does not wait for any length of time beyond the time it takes to forward the thought. There can be delays caused by no or poor signal in which case the information is stored until the connection is restored and is then downloaded.
The ‘polling’ you are most liable referring to is the checking of email on a pop3 or imap email account. This is the type of email you would typically get with your ISP. These types of email accounts need to be “polled” by an application, in this case the Blackberry network does that for you, roughly every 15 minutes (more if you’re a heavy emailer). This type of setup is the Blackberry Internet Service.
The other Blackberry setup is a “push” email system where companies use a dedicated Blackberry server to “push” corporate email to the Blackberry, and synchronise other data. Polling doesn’t happen with this setup, the emails arrive as soon as they hit the users inbox.
So both answers are right but for different types of email accounts and Blackberry setups.