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ISDN to T1 ConversionExecutive OverviewADTRAN provides a small, economical, and highly intelligent Integrated Access Device that transparently ties together a T1-based PBX system to an ISDN network without upgrading the PBX. For significantly less than the price of upgrading the PBX, the ADTRAN ATLAS 800 will provide seamless ISDN access for companies that find it difficult or too expensive to add ISDN hardware to their PBX. IntroductionThousands of PBX and phone systems were installed prior to the deployment of ISDN services and were designed to connect to the wide area public telephone network using T1 tie lines. With the growth of ISDN in the public networks, PBX phone systems are now increasingly required to connect to a central office ISDN switch, but some PBX systems are ill equipped to directly connect to ISDN public networks. With the new ADTRAN ATLAS 800 integrated access device, PBX systems can now front-end their PBX with ATLAS and achieve ISDN connectivity. The best part is that the PBX does not need to change or be upgraded - the ATLAS device brings together the PBX T1 and the public ISDN switch. ATLAS SolutionThe ATLAS 800 integrated access device provides a robust platform for integrating customer premises equipment into a wide range of network services. To do this, ATLAS delivers multiple technologies in the same platform, making it easy to mix together a diverse set of network technologies. The following diagram shows ATLAS integrating a non-ISDN PBX system into an ISDN network using the PBX T1 port. 
In this application solution, ATLAS provides a T1 port to connect to the PBX and an ISDN port to connect to the public ISDN network. With the ATLAS technology, all of the translations are handled inside ATLAS and offloaded from the PBX. ATLAS converts the out-of-band D-channel signaling of ISDN into the in-band robbed bit signaling of T1. ATLAS also provides CALLING and CALLED numbers from the ISDN network to the PBX T1 through DTMF on the T1 line. So the PBX can now make use of standard ISDN signaling involving CALLING/CALLED or ANI/DNIS phone numbers. The Automatic Number Identification (ANI) is a series of digits that correspond to the phone number that is calling. In the ISDN network, these digits are represented in a separate channel called the D-channel and are not compatible with the T1 channel. The same holds true for Dialed Number Identification (DNIS) which is the destination or called telephone number. ATLAS converts the ANI and DNIS signaling from standard ISDN signaling formats and converts those formats into standard T1 formats for the PBX. The PBX can now use the ANI and DNIS information as it is encoded in the standard T1 robbed bit signaling protocol. ATLAS passes ANI and DNIS information according to the industry standard formats including ANI/DNIS, ANI, or DNIS. ATLAS provides two T1/PRI/DSX-1 ports on the base unit. One port can be configured for T1, and the second for ISDN. This results in a very economical solution. SummaryPBX systems which have little or no ISDN capability can now easily and economically connect to ISDN networking. ATLAS 800 from ADTRAN is easy to install, fully manageable and so economical that it should pay for itself in a matter of months. For more technical details please see the Data Sheets, or call our Applications Engineering group at 800-9ADTRAN for expert help in designing a customized ATLAS solution.
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