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  2. Circuit ID - Wikipedia

    en.wikipedia.org/wiki/Circuit_ID

    A circuit ID is a company-specific identifier assigned to a data or voice network connection between two locations. This connection, often called a circuit, may then be leased to a customer referring to that ID. In this way, the circuit ID is similar to a serial number on any product sold from a retailer to a customer.

  3. Circuit identification code - Wikipedia

    en.wikipedia.org/wiki/Circuit_identification_code

    The ISDN Services User Part Circuit Identification Code (CIC) is part of the Signaling System #7 which is used to set up telephone calls in Public Switched Telephone Networks [1] as part of the Initial Address Message (IAM).

  4. T-carrier - Wikipedia

    en.wikipedia.org/wiki/T-carrier

    The T-carrier is a hardware specification for carrying multiple time-division multiplexed (TDM) telecommunications channels over a single four-wire transmission circuit. It was developed by AT&T at Bell Laboratories ca. 1957 and first employed by 1962 for long-haul pulse-code modulation (PCM) digital voice transmission with the D1 channel bank.

  5. Non-Facility Associated Signalling - Wikipedia

    en.wikipedia.org/wiki/Non-Facility_Associated...

    A single Primary Rate ISDN circuit is thus sometimes described as 23B + D. There are 23 bearer channels carrying voice or data, and one D channel carrying the Common Channel Signaling. In an NFAS configuration, multiple T1 circuits share a single D channel, with an upper limit of 20 T1 circuits in a single NFAS configuration.

  6. Robbed-bit signaling - Wikipedia

    en.wikipedia.org/wiki/Robbed-bit_signaling

    T1 is a protocol for digital transmission over telephone networks. A T1 circuit combines 24 DS0 channels through time-division multiplexing. Data is transmitted in frames, where each frame contains an 8-bit sample of each of the 24 channels, plus one extra framing bit for a total of 193 bits. Each channel carries 8,000 samples per second.

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  8. Comparison of T-carrier and E-carrier systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_T-carrier...

    Strictly speaking, a DS1 is the data carried on a T1 circuit, and likewise for a DS3 and a T3, but in practice the terms are used interchangeably. There are other data rates in use, e.g., military systems that operate at six and eight times the DS1 rate.

  9. Illinois Supreme Court: Firearm Owners Identification records ...

    www.aol.com/news/illinois-supreme-court-firearm...

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