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  2. Grade of service - Wikipedia

    en.wikipedia.org/wiki/Grade_of_service

    To help telecommunications service providers to market their different services, each service is placed into a specific class. Each Class of Service determines the level of service required. [4] To identify the Class of Service for a specific service, the network's switches and routers examine the call based on several factors.

  3. Railroad classes - Wikipedia

    en.wikipedia.org/wiki/Railroad_classes

    Class II: A carrier earning revenue between $40,387,772 and $504,803,294; Class III: A carrier earning revenue less than $40,387,772; In Canada, a Class I rail carrier is defined (as of 2004) as a company that has earned gross revenues exceeding $250 million (CAD) for each of the previous two years. [5]

  4. Network planning and design - Wikipedia

    en.wikipedia.org/wiki/Network_planning_and_design

    the technical details of the network’s capabilities. [1] [2] Planning a new network/service involves implementing the new system across the first four layers of the OSI Reference Model. [1] Choices must be made for the protocols and transmission technologies. [1] [2] The network planning process involves three main steps:

  5. Industry classification - Wikipedia

    en.wikipedia.org/wiki/Industry_classification

    Industry classification or industry taxonomy is a type of economic taxonomy that classifies companies, organizations and traders into industrial groupings based on similar production processes, similar products, or similar behavior in financial markets.

  6. Class of service - Wikipedia

    en.wikipedia.org/wiki/Class_of_service

    As related to network technology, COS is a 3-bit field that is present in an Ethernet frame header when 802.1Q VLAN tagging is present.The field specifies a priority value between 0 and 7, more commonly known as CS0 through CS7, that can be used by quality of service (QoS) disciplines to differentiate and shape/police network traffic.

  7. PSTN network topology - Wikipedia

    en.wikipedia.org/wiki/PSTN_network_topology

    PSTN network topology is the switching network topology of a telephone network connected to the public switched telephone network (PSTN).. In the United States and Canada, the Bell System network topology was the switching system hierarchy implemented and operated from c. 1930 to the 1980s for the purpose of integrating the diverse array of local telephone companies and telephone numbering ...

  8. Class-4 telephone switch - Wikipedia

    en.wikipedia.org/wiki/Class-4_telephone_switch

    A class-4, or tandem, telephone switch is a U.S. telephone company central office telephone exchange used to interconnect local exchange carrier offices for long distance communications in the public switched telephone network. A class-4 switch does not connect directly to telephones; instead, it connects to other class-4 switches and to class ...

  9. Classful network - Wikipedia

    en.wikipedia.org/wiki/Classful_network

    A Class B network was a network in which all addresses had the two most-significant bits set to 1 and 0 respectively. For these networks, the network address was given by the next 14 bits of the address, thus leaving 16 bits for numbering host on the network for a total of 65 536 addresses per network.