Appendix C: ADSL Acronyms
| POTS | Plain Old Telephone Service |
| PPP | |
| PPPoA | PPP over ATM Adaptation Layer 5 |
| PPTP | |
| PPPoE | PPP over Ethernet |
| PSTN | Public Switched Telephone Network |
| Telco | Telephone Company |
| VCI | Virtual Circuit Identifier |
| VPI | Virtual Path Identifier |
| |
VPN | Virtual Private Network |
|
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