This handy little calculator is designed to help you understand your bandwidth needs. Enter in the appropriate information below, press "Calculate Bandwidth" and the site will calculate your basic system need. VOIP Today does not make any warranty or claim that this information is correct or accurate. For estimating purposes only.
Number of Simultaneous Users
This is your estimate as to how many users will
be on the local network using their workstations
at any given time. This figure calculates users
based on 12Kbps per user (4K up and 8K down) per
Number of VOIP Lines (Voice-Over-Internet
Protocol) Internet Telephony
These are the number of lines you hope to
maintain. VoIP lines are budgeted in the link at
22Kbps (11K up and 11K down). VOIP should be used
through an encrypted tunnel. However MOST sites
do not do this. JPI has "split the difference" so
to speak. Also the level of CODEC used will
change this figure. Better CODEC's will require
Number of VPNs
This is your estimate as to how many simultaneous
VPN users there will be on your system. VPN's
very greatly in how much bandwidth they require
as do secure websites, and other security
protocols. JPI chooses a "middle of the road"
approach when calculating the link budget for
VPNs and sets the estimate at 20K per session
(10K up 10K down). Contact your OEM for the VPN
to determine the actual amount of bandwidth
required on a per user basis for your VPN.
Percentage Large Files
Every site will email, FTP, or transfer securely
some type of large file. JPI defaults the amount
to 10%. If you transfer large JPGs, GIFs, TIFFs,
Media files like audio or video, GIS information,
do database replications, or work with tool like
Lotus or Groove, increase this amount
The data outbound from your site - to the
internet or home offices or other locations.
Should be about half of what your downstream
bandwidth should be.
The data coming from the internet or "down"
from the satellite. Inbound date is usually
called "downstream" and should be about double
your "upstream" capabilities for "normal"