On 12-08-10 12:20 PM, John Lange wrote:
Arguing about which is more reliable misses the point.
...
And back to reliability, PSTN service (both analog and PRI) has zero
redundancy. It's a single wire connecting to a single piece of equipment
(at both ends) that does not support any of the routing and switching
redundancy and fail-over that an IP network enjoys. All of my clients with
PRI connections (including myself) have had some kind of failure resulting
in downtime.
Actually the "last mile" lack of redundancy typically affects both ends
of both types of connection. Almost everyone with an internet connection
has had "some kind of failure resulting in downtime"
Whether analog or IP, at least outside of major built-up areas, the cost
of a second connection from a different supplier over 100%
non-overlapping cable paths is (last I looked into it) sufficiently
non-trivial that only major players will spring for it. Even in built-up
areas, two suppliers may be using the same cable path so the redundancy
may (sometimes!) be illusory.
The routing redundancy and failover advantages you mention are, of
course, why most PSTN calls are actually routed over IP by the major
telcos... at least beyond the "last mile".
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
