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Xdot25

it is a protocol of ITU-T (國際電信聯盟 電信標準化部門). it helps to keep operation effectively even bitsrate-errors occuring.

Tele Carrier

They use X.25 protocol to make Packets-SW in Network. This protocol enables carrier to detect error and offer covery.

   Tele Carrier     --------------------------------------  PSN
        |
        |
        ---- DTE, data terminat equipment (workstations & hosts)
        |
        ---- PSE, packet sw exchange
        |
        ---- PAD, packet assembler/diassembler (end device to DCE)
        |
        ---- DCE, data circuit-terminate equipment

Stream Line using X.25

see Frame Relay. (bneficial to save bandwidth)

Support Both SVC & PVC

SVC: sw virtual circuit

PVC: permanent virtual circuit