What is VCI & VPI in modem?
Virtual Path Identifier (VPI) is an 8-bit or 12-bit field within the header of Asynchronous Transfer Mode packet. Virtual Channel Identifier (VCI) along with VPI is used to identify the next destination of a cell as it passes through a series of ATM switches on its way to its destination. These numbers are essential for every DSL Modem to communicate with each other.
Like any other modems in other countries, our ISP in the Philippines are also using VPI, VCI and Encapsulation to communicate. Along with other configuration setting values, these VPI VCI and Encapsulations are needed to have a correct value to avoid internet problems.
Virtual Path Identifier, Virtual Channel Identifier and Encapsulation mode values in PLDT, Globe and Converge
Bayantel Modem Settings (Bridge Mode)
VPI: 0
VCI: 33
Encapsulation: LLC
Globe Broadband DSL Modem Settings (Bridge Mode)
VPI: 0
VCI: 35
Encapsulation: LLC
Digitel Modem Settings
VPI: 8
VCI: 35
Encapsulation: PPPoE LLC
PLDT myDSL Metro Manila (Bridge Mode)
VCI: 100
VPI: 0
Encapsulation: RFC2516 PPPoE (aal5-0)
Header: LLC
PLDT myDSL Provincial (Bridge Mode)
VCI: 35
VPI: 0
Encapsulation: RFC2516 PPPoE (aal5-0)
Header: LLC
PLDT myDSL Metro Manila (Routing Mode)
VCI: 100
VPI: 0
Encapsulation: RFC1483
Header: LLC
PLDT myDSL Provincial (Routing Mode)
VCI: 35
VPI: 0
Encapsulation: RFC1483
Header: LLC