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More than likely, the Call ID number will be a ten-digit number. 5. Reenter the number in SN0 as it is displayed in the Call ID message and test Call Screening again. SBus Termination Use the SBus Termination option (see Figure 6-12) to select 100 ohm termination resistors for the S/T interface on ISU 2x64 units that are equipped for the ISDN S/T interface. These units (part numbers 1200051L2, 1200051L4, 1200051L5, and 1200051L6) connect to the S/T interface of an NT1 device or the S/T line card. 3=CONFIG 1=Netw. options 2=DTE options 3=Protocol 4=Quick setup 5=Security 6=Remote Config 1=Dial Line 2=Leased Line 1=Switch protocl 2=Call type 3=Terminal ID 4=Busy Out 5=Dial options 6=Auto answer 7=Answer tone 8=Connect Timout 9=Call Screening 0=SBus Terminati 1=100 ohm On 2=100 ohm Off Figure 6-12 SBus Termination Menu Tree ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D Chapter 6. Configuration Select 100 ohm On to turn on the 100 ohm termination resistance across the S/T transmit and receive pairs. Select 100 ohm Off to turn off the 100 ohm termination resistance across the S/T transmit and receive pairs. The SBus Termination resistors are not present on ISU 2x64 units equipped with the integrated NT1 (part numbers 1200051L1 and 1200051L3). Setting the SBus Termination resistance to on or off on these units has no effect on their operation and can be ignored. LEASED LINE SERVICE This section explains how to configure the ISU 2x64 when using a 2B1Q leased digital service or a service providing a permanent connection between end points. The distance can be up to 18000 feet. 3=CONFIG 1=Netw. options 2=DTE options 3=Protocol 4=Quick setup 5=Security 6=Remote Config 1=Dial Line 2=Leased Line 1=Clock mode 1=Slave 2=Master 2=Channel rate 1=64k 2=128k 3=SBus Terminati 1=100 ohm On 2=100 ohm Off Figure 6-13 Leased Line Menu Tree Selecting Leased Line configures the unit for leased line service or service providing a permanent connection between end points such as limited distance modem or LDM service. Follow this step-by-step procedure to configure the ISU 2x64 for Leased Line, Clock mode, Channel rate, and S Bus Termination. Clock mode: Slave/Master By configuring the ISU 2x64 for Master timing, the ISU 2x64 can provide clocking for both ends of the phone line. This Master option is intended to be used at one end of a limited distance 61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual Chapter 6. Configuration 48 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D modem application, where two ISU 2x64 units are directly connected without the use of channel banks (see Figure 6-14). The far-end unit should be configured for Slave and derives its clocking from the ISU 2x64 configured as Master. Figure 6-14 Limited Distance Modem Applications If two ISU 2x64 units are connected through channel banks, both units should be configured for Slave mode (see Figure 6-15). Figure 6-15 Leased Application with Channel Banks Channel Rate In Leased Line operation, the channel rate for the ISU 2x64 can be configured for 64 kbps or 128 kbps. When the channel rate is set to 64 kbps, each DTE port is assigned one of the bearer channels. For example, if two ISU 2x64 units are configured for leased line service and the channel rate is set to 64 kbps in both units, then DTE#1 of the master unit and DTE#1 of the slave unit would be ENTER 1 2 3 4 5 6 7 8 9 # 0 * RS CS TD RD LD TR SR ISU 128 CANCEL ENTER 1 2 3 4 5 6 7 8 9 # 0 * RS CS TD RD LD TR SR ISU 128 Mixed Gauge Wire CANCEL DTE DTE 64K 64K 64K 18 kFt 64K ISU 2x64 (U-interface) LDM 64 Master Channel Rate = 64K ISU 2x64 (U-interface) Leased 64K Channel Rate = 64K XXXXX XXXXX XXXXXXXXX XXXXX XXXXX XXXXXXXXX ENTER 1 2 3 4 5 6 7 8 9 # 0 * RS CS TD RD LD TR SR ISU 128 CANCEL ENTER 1 2 3 4 5 6 7 8 9 # 0 * RS CS TD RD LD TR SR ISU 128 CANCEL DTE DTE 64K 64K 64K 64K T1 ISU 2x64 Channel Rate = 64K ISU 2x64 Channel Rate = 64K BIMUX DP or Equivalent BIMUX DP or Equivalent Chapter 6. Configuration connected through one of the bearer channels and could utilize up to 64 kbps of bandwidth. Likewise, DTE#2 of the master and DTE#2 of the slave would be connected through the other bearer channel and could also utilize up to 64 kbps of bandwidth (see Figure 6-15). When the channel rate is set for 128 kbps in both units, both bearer channels are assigned to one DTE port. This assignment is user-configured. Select a DTE rate higher than 64 kbps for the DTE port that will run the application requiring greater than 64 kbps bandwidth. Select the same DTE port for both Master and Slave 2x64 units. Set the unused DTE port's DTE rate to a rate less than 64 kbps to facilitate correct operation between the two ISU 2x64 units. For example, if an application requiring 128 kbps was run through DTE#1, first configure the channel rate of the leased line to 128 kbps and set the DTE rate for DTE#1 to 128 kbps synchronous. The DTE rate for DTE#2 should be set at 56 kbps or lower. Enter ...

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