AT B-300
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AT B-300 Pocket Size NT1

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Part Numbers:
555-300BA
Part Numbers:
555-132OU

Installation Guide

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PDF File
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A Low Cost, High Quality Solution for Connecting ISDN Terminal Equipment to ISDN BRI Services.

Product Features:

  • Compatible with North American 2B1Q basic rate services and standard ISDN terminals
  • Provides 2B+D ISDN Basic Rate S/T & U-Interfaces
  • Hot Swappable NT1
  • DIP Switch selectable termination settings
  • Automatic lightning and surge protection
  • Supports point-to-point and point-to-multipoint 
  • LED status indicators
  • Ease of configuration and installation
  • Standalone or Rack Mount capabilities, compatible with the following rack mounts:
  • - Lucent NT1 B-310
    - SEI PR300 Series
  • The AT B-300 terminates and converts the two-wire U-Interface that comes from the telephone company to a four-wire S/T-Interface to provide ISDN Telephones, Video Conferencing Systems, or other ISDN CPE devices access to BRI ISDN services.

    The AT B-300 is offered as a single unit with no powering or as a kit with an 8W external power supply with cables.  The 8W Power Supply (110Vac, 60Hz), provides power to the AT B-300 and provides ITU Standard Power Source 2 (PS2) power through the S/T-Interface to the ISDN CPE.  The AT B-300 with 8W Power Supply is ideal for ISDN telephone or Video Conferencing Systems applications.  The TA B-300 single unit is compatible with the SEI PR300 Series and Lucent NT1 B-310 rack mount and is ideal for these rack mount applications.
  • The AT B-300 conforms to industry standard 2B1Q line code for the U-Interface; ANSI T1.601-1992. The S/T-Interface conforms to T1.605-1991; ITU/CCITT I.430 standards; and is a FCC, DOC, CUL, and CE approved device. Its reliable design protects against lightning and power surges.

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