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61. ISDN is considered a circuit-switched connection . The B channel is the elemental circuit-switching unit.
62. Definition of: ISDN (Integrated Services Digital Network) An international standard for switched, digital dial-up telephone service for voice and data.
63. Asynchronous Transfer Mode is defined as transfer mode for B - ISDN by ITU - T .
64. ATM switching technique is one of main techniques in B - ISDN.
65. Primary Rate Interface (PRI) is an ISDN interface for primary rate access, which consists of a single 64-kbps D channel plus 23 (T1) or 30 (E1) B channels for voice or data.
66. Because SS7 has more intelligent capabilities than User-Network Interface protocols such as ISDN Primary Rate Interface, SS7 can help ease congestion across the Internet.
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