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  1. Glossary

    ... fixed-line copper cable phone service. See PSTN and PTO. PPP  Public-Private Partnership - A partnership between ... system; however, may also refer to mobile networks. PTO  Public Telecom Operator - Usually the circuit switched ...

  2. Glossary of Terms

    ... fixed line copper cable phone service. See PSTN. and PTO. Private Peering   See Peer/peering. ... networks. Public Telecom Operator PTO Usually the circuit switched fixed line telecom operator, ...