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Wireline
Diagnostic tools...
    LineScope
    LineCoupler
Tone generators...
    CPT-Master
Telephony...
    World DAA
    database
    World PSTN
    tone database
    Telephone line
    signalling
Modems...
    Overview
    V.22 handshake
    V.22bis handshake
    V.32 handshake
    V.34 handshake
    Wireline DAA
OEM/VAR...
    OEM Centre

Telephone line signalling

  • DC conditions
  • On-hook - Nominally 48 Vdc, can vary between 24 to 60 Vdc.
  • Off-hook - see V/I characteristic plots for FCC (US) & CTR (Europe) networks.
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