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Applications LTPH-UM-1234-01
6 April 30, 2003 HDU-409 Lists 1, 2, and 3
APPLICATIONS
HiGain doublers operate with any number of other T1, Plain Old Telephone
System (POTS), Digital Data Service (DDS), or other HiGain systems
sharing the same cable binder group.
The HDU-409 can be used in two- to five-span circuits, depending on the
models of the HLU and HRU being used with the doubler units and the power
option chosen for the HRU. The number of doublers is equal to one less than
the number of spans as shown in Figure 6 on page 24.
Table 3 lists the maximum number of HDU-409 doubler units that can be
deployed according to which HLU and HRUs are used.
Each span can take up to 30 seconds to acquire HDSL
synchronization. The total time to acquire end-to-end
synchronization increases with the number of spans.
Table 3. HDU-409 Circuit Ranges
HLU Model
Maximum Number of HDU-409 Doublers Per Circuit
(a)
(a) HRU-411 applications with Current-Customer Premises Equipment (I-CPE) ON are
limited to single HDU-409 doubler circuits. The HRU-412 is limited to applications with
one and two doublers only.
Line-Powered Remote Locally-Powered Remote
I-CPE ON I-CPE OFF I-CPE ON I-CPE OFF
HLU-388 List 2x,
HLU-319 List 2x,
HLU-231 List 3D,
HLU-231 List 6D,
HLU-232 List 1D
HLU-231 List 7x,
HLU-431 List 1D
1 2 2 2
HLU-231 List 8D,
HLU-319 List 5D,
HLU-388 List 5D
HLU-231 List 8/List 8E,
HLU-319 List 5/List 5E,
HLU-388 List 5/List 5E
2
3
(b)
(b) Requires HRU-402 or HRU-411.
2
4
(c)
(c) Requires HRU-402 List 1 or List 3.