Save Bandwidth on Internet Link
As an ISP you whish to make your customers happy and provide them with a smooth web browsing. In the same time you need to control your bandwidth cost. An efficient transparent cache is the mandatory first step to save bandwidth and improve customers QoE.
An Island ISP
What are the Issues
Obviously buying additional bandwidth will improve performances. But some performance issues are not caused by the bandwidth limitation.
When the round trip time is too long, the bandwidth delay product issue limits the the actual bandwidth of a TCP session regardless the bandwidth of the network link layer. Deploying more bandwidth will have no effect on the download speed of each individual user.
Whatever the subscribed long haul bandwidth, the contention ratio is so big that the long-haul will remain saturated for ever. The definitive solution is no longer a forever increasing bandwidth.
Step 1: Deploy a PETAcache
80% of the web page objects and 100% of the downloaded files are cacheable. Deploying the cache makes it possible to serve these data from the cache instead of repeatedly redownload them. This frees available bandwidth for the non cacheable objects, mostly dynamic private web content.
Moreover the cache shorten the end-to-end TCP connection which workarounds the bandwidth delay product and thus increase the available bandwidth per TCP session.
Step 2: Enable Optimization over the Last Mile
Enabling PETAcache Lossless compression and various advanced content aware optimizations reduces the traffic over the access network and the last mile and speed up the time to download.