User's Manual

Fiber Optics Powerwave
5 - 4 Rev. P1A9-Draft 2004-11 VM100 56/EN – User’s Manual
F-Net Characteristics
The IP communication signal in an F-net is modulated on a sub carrier below the RF
modulated signal.
The communication transfer rate is 66Kb per second.
F-net can be built up with separate downlink and uplink fibers, multi-drop link
communication, and a dedicated master node and slave nodes (M and S respectively in
the left figure).
F-net can also be built up with single fiber and full-duplex transmission, see Figure 5-3.
Figure 5-3. Single fiber network with five nodes
The network shown in Figure 5-3 has optical WDMs (DX O) in each node, which makes
it possible to use one downlink wavelength and four different uplink wavelengths in the
same fiber.
An F-net contains one master node (the left FON unit in Figure 5-3) and it can contain
up to approximately four slave nodes (the right FON units) due to the signal power
sharing in the optical splitters. In Figure 5-3 there are three 50/50 percent splitters that
reduce the signal power to each of the four slave nodes to 25% of the initial signal power.
In Figure 5-3, the master node is a gateway by means of an RCC. It can communicate
with an O&M software via modem.
The left FON node (CS) only shall be configured with Control Station Capability and
thus be the master unit. None of the other FON nodes are allowed to have the Control
Station Capability because it is a master/slave network. Only one node is allowed to
speak at the same time.
Control Station Capability is described in the VM100 01/EN, OM-Online, User’s
Manual.
FO
M S S
FON FON FON
FON FON
RCC
50
50
PSTN
BTS
1
DX
O
DX
O
FON
DX
O
DX
O
DX
O
FON
CS
50
50
50
50
FON