I am looking for a 99.9% uptime internet solution . I cannot bear downtime of even 2 seconds.
You can't bear 2 seconds of downtime? That equates to 0.00007716% [2/(60*60*24*30)*100] of downtime per month. I dont think you get that with any ISP in the world, not on a written down SLA anyways.
I am considering leased line / ISDN and dedicated ethernet service ( enterprise ). Please comment what will be better for me quality and cost wise.
ISDN is pretty much old technology - it's restrictive in terms of the bandwidth. You might want to look at a leased line circuit. Even there the SLAs don't go beyond 97% if I remember right.
Does any one knows about dedicated ethernet connectivity ( enterprise) with SLA where the ISP guarntees 100% uptime? Please let me know what will be the cost for the same.
We're talking 2 different things here: type of internet connection(ie say, home broadband vs leased line ) AND media(telephone line, cable, fibre, copper pair etc)
I'm not sure if any enterprise level internet connection uses ethernet as a medium. What you must probably be looking for is something that comes by fibre. As I said even there you're not assured 100% uptime. If you really want that sort of uptime you must be making provisions for redundancy - ie get 2 service providers and configure one as a backup/failover.
I am also considering ISDN , but some one said me that even in ISDN there will be call drops and internet will be not 100% uptime. Please comment how will be ISDN for me.
As far as I know ISDN these days is used only for PBX phone systems(ie supporting multiple numbers on 1 phone line kind of stuff). It might be used as a backup internet connection but perhaps not the main connection.
Further can any one tell me whether the
Business broadband plans of airtel are 99% reliable ? Is airtels busines broadband internet 100% uptime?
No they are not but do check their business plans. Most issues with reliability are to do with the last mile. If your last mile provision has problems you might have disconnections. My airtel home broadband has given better uptimes than my office's leased line precisely for this reason. Try going with a provider on fibre if you can help it.
