ISDN-BRIIntegrated Services Digital Network-Basic Rate Interface
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in table 1, the isdn-bri column gives the quantities and distribution by object of subscribers (pbxs) requiring isdn connection, namely 12 subscribers.
The 1586T allows all the tests needed to properly qualify two-wire and four-wire, leased or dial-up circuits for use with POTS, pair-gain, ISDN-BRI, xDSL or DDS equipment.