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Chapter 6. Configuration
40 ISU 128 User Manual 61202.029L2-1
LEASED LINE SERVICE
This section explains how to configure the ISU 128 when using a 2B1Q leased
digital service or a service that provides a permanent connection between end
points. Figure 6-12 illustrates the menu tree for setting leased line.
Figure 6-12
Leased Line Menu Tree
Selecting leased line configures the unit for leased line service or service that
provides a permanent connection between end points such as limited distance
modem.
Follow this step-by-step procedure to configure the ISU 128 for Leased Line
Clock mode and Channel rate.
Clock Mode:Slave/Master
By configuring the ISU 128 for Master timing, the ISU 128 can provide clock-
ing for both ends of the phone line. This Master option is used at one end of a
limited distance modem application, where two ISU 128 units are directly con-
nected without the use of channel banks (see Figure 6-13). The far-end unit
should be configured for Slave and it derives its clocking from the ISU 128
configured as Master.
Figure 6-13
Limited Distance Modem Application
3=CONFIG
1=Netw. options
2=DTE options
3=Protocol
4=Quick setup
5=Remote config
1=Dial Line
2=Leased Line
1=Clock mode
2=Channel rate
1=Slave
2=Master
1=64k
2=128k
ENTER
123
456
789
#0
*
RS CS TD RD LD TR SR
ISU 128
CANCEL
ENTER
123
456
789
#0
*
RS CS TD RD LD TR SR
ISU 128
CANCEL
Mixed Gauge Wire
DTE DTE
18,000 Ft
ISU 128
Master
ISU 128
Leased 128K