Appendix B - Technical Reference
150-454-111-06
32
February 25, 2000
HRE-454
Figure 14.
HRE-454 Vertical And Horizontal Mounting Orientation
Deployment considerations determine the physical location of the HRE-454 doubler enclosures, which are:
1
The first and most important rule is to place each enclosure span to the electrical limits of 35 dB. This will
place the first doubler at the 35 dB location and the second at 70 dB. Such electrical setting allows the
maximum range of 105 dB if the third span to the remote unit is also 35 dB.
2
If the first rule is not applicable, then make all the spans the same electrical length (same 196 kHz loss). This
minimizes span loss and maximizes operating margin which will result in optimum transmission
performances. If specific application constraints preclude using Rule 2, or two different circuit layout choices
have the same maximum span loss, then use Rule 3.
3
The third rule minimizes the power consumption and dissipation of the line unit that powers the doubler or
remote units. Rule 3 requires Span 1 to be a minimum and Span 3 to be a maximum. This choice minimizes
the I
2
R loss in the cable pairs and reduces the thermal stress on the line unit.
