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Chapter 6. Configuration
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.
64K
ISU 2x64 (U-interface)
DTE
LDM 64 Master
Channel Rate = 64K
If two ISU 2x64 units are connected through channel banks, both
units should be configured for Slave mode (see Figure 6-15).
64K
64K
ISU 128
ENTER
1
4
7
R S C S
T D
R D L D
T R
S R
CANCEL
#
ISU 2x64
DTE
Channel Rate = 64K
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
48
64K
18 kFt
ISU 128
ENTER
1
2
3
4
5
6
7
8
9
Mixed Gauge Wire
R S C S
T D
R D L D
T R
S R
CANCEL
#
0
*
BIMUX DP
or Equivalent
T1
XXX XX
XXXXX
XXXXXX XXX
2
3
5
6
8
9
0
*
ISU 2x64 Dual Port ISDN Service Unit User Manual
64K
64K
ISU 128
ENTER
1
2
3
4
5
6
7
8
9
R S C S
T D
R D L D
T R
S R
CANCEL
#
0
*
ISU 2x64 (U-interface)
Leased 64K
Channel Rate = 64K
Limited Distance Modem Applications
BIMUX DP
or Equivalent
64K
X
X X
X X
X
X X
X X
X
X X
X X
X X
X X
ISU 128
ENTER
1
2
3
4
5
6
7
8
9
R S C S
T D
R D L D
T R
S R
CANCEL
#
0
*
ISU 2x64
Channel Rate = 64K
Leased Application with Channel Banks
DTE
Figure 6-14
64K
DTE
Figure 6-15
61200051L1-1D
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