3am Systems Subscribe | Sign in
Subscribe free to access locked resources. 		Skype chatSkype chat
Home Products Services Resources About us Contact us Jobs
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

  • Ringing signal
  • The ringing signal has the same cadence as the ringing tone.
  • Nominally 90 Vac, at 20 Hz (US) or 25 Hz (Europe)
    •  ©2010  3am Systems Ltd.  All rights reserved. Site map | Terms of use | What's new