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The MSP-BRI PCM interface is a general-purpose\u00a0ISDN Basic Rate<\/a>\u00a0interface for host-based telephony media processing. It allows the BladeWare<\/a>\u00a0OEM to address markets where BRI is prevalent in office environments.<\/p>\n One ISDN Basic Rate Interface (BRI) supports two independent telephone channels. Using digital encoding, BRI is carried over a single twisted pair between the telephone end office to the customer premises, where the two-wire signal (the U interface) is converted to a four-wire signal (the S\/T interface) by a network-termination device called an NT-1. The MSP-BRI interfaces with the four-wire S\/T interface, deriving the two telephone channels, called bearer channels, and one 16-Kbit signaling channel, called a D-channel, and implements the ISDN protocols to give fast detailed call control .<\/p>\n The MSP-BRI is a half-height PCI or PCI Express board with 2, 4, 6\u2026 to 24 BRI lines\/ports using one expansion-card slot. Each individual card has up to three dual BRI daughtercards to provide six basic-rate interfaces or 12 telephhone lines. Up to four boards can be interconnected on a \u201cmicro backplane\u201d to expand the assembly to 24 basic-rate interfaces.
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