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Chapter 6. Configuration
48
ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D
modem application, where two ISU 2x64 units are directly con-
nected without the use of channel banks (see Figure 6-14). The
far-end unit should be configured for Slave and derives its clock-
ing 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
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
64K
64K 64K
64K18 kFt
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
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
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