The type of connection determines the maximum bandwidth available between the two locations, for example, a T3 line provides 45 megabits/second. However, the important factor to consider is whether the available connection is to be used by any other applications or is exclusively reserved for replicating to a single Secondary. If other applications are using the same line, it is important to be aware of the bandwidth requirements of these applications and subtract them from the total network bandwidth. If any applications sharing the line have variations in their usage pattern, it is also necessary to consider whether their times of peak usage are likely to coincide with peak network usage by VVR. Additionally, overhead added by VVR and the various underlying network protocols reduces effective bandwidth by a small amount, typically 3% to 5%.