Chapter 6. Configuration61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual 47Select 100 ohm On to turn on the 100 ohm termination resistanceacross the S/T transmit and receive pairs. Select 100 ohm Off toturn off the 100 ohm termination resistance across the S/T trans-mit and receive pairs.The SBus Termination resistors are not present on ISU 2x64 unitsequipped with the integrated NT1 (part numbers 1200051L1 and1200051L3). Setting the SBus Termination resistance to on or offon these units has no effect on their operation and can be ignored.LEASED LINE SERVICEThis section explains how to configure the ISU 2x64 when using a2B1Q leased digital service or a service providing a permanent con-nection between end points. The distance can be up to 18000 feet.Figure 6-13Leased Line Menu TreeSelecting Leased Line configures the unit for leased line serviceor service providing a permanent connection between end pointssuch as limited distance modem or LDM service.Follow this step-by-step procedure to configure the ISU 2x64 forLeased Line, Clock mode, Channel rate, and S Bus Termination.Clock mode: Slave/MasterBy configuring the ISU 2x64 for Master timing, the ISU 2x64 canprovide clocking for both ends of the phone line. This Masteroption is intended to be used at one end of a limited distance3=CONFIG1=Netw. options2=DTE options3=Protocol4=Quick setup5=Security6=Remote Config1=Dial Line2=Leased Line1=Clock mode 1=Slave2=Master2=Channel rate 1=64k2=128k3=SBus Terminati 1=100 ohm On2=100 ohm Off
