Radwin 2000+ SERIES, Руководство пользователя

Страница: 186 / 276

RADWIN 2000+ Series User Manual Release 4.2.40 12 ‐ 9
Transmission Phase Shift
12.4.2 Transmission Phase Shift
In the case shown in Figure 12 ‐ 5 above, RT ‐ A(HBS) A1 transmits and receives opposite RT ‐
B(HSU) B1. So, when RT ‐ A(HBS) A1 transmits, RT ‐ B(HSU) B1 must receive, and vice ‐ versa. The
above Radio Frame Pattern will then appear as follows:
However, RT ‐ A(HBS) B1 is co ‐ located with RT ‐ B(HSU) B1. As can be seen, this will cause
interference between these co ‐ located units.
To prevent this, RT ‐ A(HBS) B1
1
must have its transmission phase shifted. That is, the
transmission and receive times of RT ‐ A(HBS) B1 must be reversed, as shown:
As a result, the radio frame pattern of RT ‐ A(HBS) B1 is synchronized with that of RT ‐ B(HSU) B1,
and there is no interference between these two units. Configuring GHSS with an Internal GPS
Unit below describes how to configure the RT ‐ A(HBS) for this.
1. Another option is to shift the transmission phase of HBS A1 instead of HBS B1, but that requires shifting the
phases of *all* HBS units at Site A1, which is more time ‐ consuming.