What does PSTN mean?
PSTN refers to the Public Switched Telephone Network, the legacy
standard that made telephone service nearly universal over the
last hundred years. The PSTN is based on analog telephone sets
with copper wire circuits that are switched to connect phones
together. TDM trunk lines are also considered part of the PSTN.
What is a Service Level
An SLA or Service Level Agreement is often part of the contract
between a business and telecom carrier for line services such
as T1, or T3.The SLA spells out the expected availability of the
line service and what penalties the carrier is liable for if the
line doesn't perform as stated.
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