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T-1 and ISDN CONNECTIVITY DAC Systems has been implementing T-1 systems since 1990 and is adept at working with ISDN. Our systems can be connected to your PBX and/or directly to the telephone company. We supply systems to telephone companies that perform protocol conversion, trunk to trunk routing, take back and transfer capability, divert on busy, and more. We do so much work with T-1 and ISDN, we even manufacture our own cables. Turnkey systems include all needed components, Channel Service Units, cables, power supplies, etc. For installing systems, we help get the job done by using in-house built test equipment and industry standard test sets. This gives us both visibility and controllability which is invaluable when working with telephone company and PBX installers. Our systems can be connected using either trunk side or station side protocols. We have a great deal of experience in this area having implemented systems for telephone companies, PBX manufacturers, and voice over IP equipment manufacturers.