Chapter 6. Configuration48 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1Dmodem application, where two ISU 2x64 units are directly con-nected without the use of channel banks (see Figure 6-14). Thefar-end unit should be configured for Slave and derives its clock-ing from the ISU 2x64 configured as Master.Figure 6-14Limited Distance Modem ApplicationsIf two ISU 2x64 units are connected through channel banks, bothunits should be configured for Slave mode (see Figure 6-15).Figure 6-15Leased Application with Channel BanksChannel RateIn Leased Line operation, the channel rate for the ISU 2x64 can beconfigured for 64 kbps or 128 kbps. When the channel rate is setto 64 kbps, each DTE port is assigned one of the bearer channels.For example, if two ISU 2x64 units are configured for leased lineservice and the channel rate is set to 64 kbps in both units, thenDTE#1 of the master unit and DTE#1 of the slave unit would beENTER 1 2 34 5 67 8 9# 0 *RS CS TD RD LD TR SRISU 128CANCELENTER 1 2 34 5 67 8 9# 0 *RS CS TD RD LD TR SRISU 128CANCELMixed Gauge WireDTE DTE64K64K 64K64K18 kFtISU 2x64 (U-interface)LDM 64 MasterChannel Rate = 64KISU 2x64 (U-interface)Leased 64KChannel Rate = 64KXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXENTER 1 2 34 5 67 8 9# 0 *RS CS TD RD LD TR SRISU 128CANCELENTER 1 2 34 5 67 8 9# 0 *RS CS TD RD LD TR SRISU 128CANCELDTE DTE64K64K 64K64KT1ISU 2x64Channel Rate = 64KISU 2x64Channel Rate = 64KBIMUX DPor Equivalent BIMUX DPor Equivalent
