Exchange ActiveSync Upload/Download Bandwidth Required?

I am reviewing several client setups for ActiveSync as far as bandwidth required to service mobile devices syncing mail/calendar/contacts.
They are small businesses with a max of 15 remote devices connecting to Exchange, so I was trying to baseline a download/upload speed to ensure this service works correctly.
Any suggestions?
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Alan HardistyCo-OwnerCommented:
I have about 100 devices with Exchange accounts running happily from our Exchange 2010 server and our Upload / Download speed is 1.3Mb / 8mb
Jessie Gill, CISSPTechnical ArchitectCommented:
It will be different for every user with an active sync account.  If you have users that receive lots of mail and attachments they will consume more bandwidth then a user that gets a few emails.   If your bandwidth is enough to send and receive emails with no issue from the office then you are fine with active sync, remember active sync will check exchange for new messages all the time, but that check is very miniumum for bandwidth usage the only time it will consume bandwidth is  when it gets an email witch can be 12k to 20 meg or what ever you have set on the exchange server.  

With your scenario of 15 devices with today's Internet speeds, I highly doubt you will suffer any badwidth issues.  Most places have at least 5mbit down and 1mbit up. And even that is more then enough.
FlippAuthor Commented:
I have a number of SMB clients who are only able to get ADSL with no more than 1mb Down and 256kb Up, so as you can imagine when an Exchange Server is using the Up on these connections it could get congested.

Based upon these scenarios I would like to provide all clients a baseline/recommendation to upgrade Internet plans/connections where possible.

So perhaps something like per 10 Email Accounts being used for Active Sync, 512kb is required.

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Alan HardistyCo-OwnerCommented:
I can't comment as I don't have any customers with an equivalent speed unfortunately.

The way Activesync works is to maintain an open connection with the server with no data being transmitted.  When a new email arrives on the server, the server sends a message to the device and tells it to sync.  The device then syncs and pulls down the new message.

If the message is big - then the outbound speed will be an issue, but if not, then I don't see it being a problem - you are talking about a few kb, which won't take long to download, but it depends on what else is using the connection.
FlippAuthor Commented:
Thanks Alan.

Any ideas or hints on how I can start to baseline? Assuming that there could be other services like VPN/RWW/OWA etc.?
Alan HardistyCo-OwnerCommented:
It isn't something I have ever had to do I'm afraid.

The busier the server is in terms of emails, then the busier Activesync will be, so it will depend on how much email traffic is sent / received as to how much data Activesync has to transmit to the phones.

You could look at a days emails and see how much data is being transmitted / received a day perhaps.

I used to have a 2Mb down and 256kb up and Exchange 2003 worked pretty well with numerous devices.  When the speed was increased, the speed for everything else improved too, noticeably, so you should be able to work on a 256kb upload / 1Mb download quite happily, just couldn't suggest how many devices max to recommend.

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FlippAuthor Commented:
Thank you for your advice!
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