Chapter 3.Installation14 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1DIf using ISU 2x64, part number 1200051L2, 1200051L4, 1200051L5,or 1200051L6, connect an ISDN Basic Rate S/T interface to the RJ-45 connector marked ISDN IFC. The S/T interface can be pro-vided from an S/T line card of an ISDN switch or PBX, or from anNT1 network termination unit.If using a leased service, connect the network interface to the RJ-45 connector marked ISDN IFC.See Connector Pinouts on page 119 for network connection pinassignments.DTE DATA CONNECTIONData terminal equipment (DTE) is connected to the ISU 2x64 byusing the RS-530/EIA-232 interfaces or by using the external RS-530-to-V.35 adapters (part number 1200072L1). A maximumcable length of 50 feet is recommended for the RS-530/EIA-232interfaces. If using the RS-530-to-V.35 adapter and connected to afull specification V.35 interface, the maximum recommendedcable length is 15 feet. The pin assignments for the DTE inter-faces are shown in Connector Pinouts on page 119. Be sure to con-figure the menu option for the connector type used in yourapplication. See DTE Options for Asynchronous and SynchronousOperation on page 50.The RS-530/EIA-232 interface and the RS-530-to-V.35 interfacesupports data rates up to 128 kbps. The DTE rate is configuredfrom the front panel of the ISU 2x64 or by using AT commands.See Configuration to configure the ISU 2x64 with the appropriatedata rates for your application.To prevent possible radio frequency interference emissions, a shieldedV.35 cable is required.
