ADTRAN ISU 2X64 Interoperability, ISU 2X64 Single Port Operation, ISU 2x64 Front Panel

Chapter 1.Understanding ISDN and the ISU 2x64

ISU 2X64

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Figure 1-2

ISU 2x64 Front Panel

ISU 2X64 INTEROPERABILITY

Telephone networks are evolving from analog technologies to digital technologies such as ISDN. This transition is time-consum- ing and costly for the telephone companies and upgrading all lo- cations and facilities is a lengthy process.

The ISU 2x64 bridges this transition by supporting communica- tions with existing and future network services and equipment. The ISU 2x64 supports communications with Switched 56 Service and Switched 56 DSUs (2-wire and 4-wire) as well as various ISDN terminal adapters, ISDN terminal equipment, and BOND- ING-compatible Inverse Multiplexers.

Figure 1-3 illustrates the ISU 2x64 operation in various switched network services and customer premises products.

ISU 2X64 SINGLE PORT OPERATION

The ADTRAN ISU 2x64 is designed to operate over multipoint ISDN lines in North America that will require two Service Profile Identification (SPID) numbers from the telephone company when the ISDN lines are installed. These SPID numbers tell the ADT- RAN ISU 2x64 which port or DTE# to route incoming and outgo- ing calls. See Ordering ISDN Without IOCs on page 125 for further details on ordering multipoint ISDN service.

4 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D