User's Manual

Fiber Optics Powerwave
4 - 12 Rev. P1A9-Draft 2004-11 VM100 56/EN – User’s Manual
Simplex Transmission
This section contains two examples of simplex transmission over fiber.
Figure 4-10. Simplex transmission between an RMU and a FOR unit
The first example, shown in Figure 4-10, illustrates a simple configuration. This
configuration is described in the previous sections in this chapter, but in this case an
RMU is used for radio transmission with the BTS.
The downlink and uplink wavelength is 1310nm.
Figure 4-11. Simplex transmission between a BMU and four FOR units
The second example, shown in Figure 4-11, illustrates a BMU and four FOR units
connected via optical splitters in a star configuration. Downlink and uplink wavelength
is 1310nm.
The optical power loss for an optical 50/50 splitter is 3dB. Additional connectors add a
loss of 0.5dB each. Due to the power sharing, up to approximately four slave nodes
(FOR) can be connected to a master FON unit (BMU). For additional slave nodes,
another FON unit has to be inserted in the BMU.
The optical splitters are usually included in the FOU located in the BMU. Figure 4-11
shows, schematically, these parts outside the BMU cabinet.
1
1
RMU FOR
DL UL
BTS
DL = 1310nm
UL = 1310nm
1
1
BMU
FOR
DL
UL
BTS
FOR
UL
FOR
UL
50
50
FOR
50
50
50
50
50
50
50
50
50
50
DL = 1310nm
UL = 1310nm
UL