User's Manual

Fiber Optics Powerwave

5 - 6 Rev. P1A9-Draft 2004-11 VM100 56/EN – User’s Manual

The FON Unit Net Interfaces

This section describes the FON unit in networks, one of the most important subunits in

repeater networks. The FON unit is here described as a block with network interfaces.

The FON board contains all software and protocols required for both W-net and F-net

communication, routing included. A sole FON board can be a complete node in an F-net

or W-net.

Figure 5-5 shows the FON board with the communication interfaces pointed out. The

figure shows also some of the most important function blocks on the FON board. The

small figure is a simplified block symbol of the FON board.

Figure 5-5. FON with communication interfaces

The CPU unit with loaded software (SW) controls the FON unit including the network

communication. The RF block in Figure 5-5 converts electrical signals to optical signals

and vice versa.

The local port is used for cable connection between the FON unit and an O&M

workstation. PPP is used for communication via this port.

The remote port is used for remote connection between the FON unit and an O&M

workstation via modem. PPP is used for communication via this port.

WLI is the communication port for W-net.

FLI is the communication port for F-net. In Figure 5-5, this part of the FON board is

marked to indicate an optical part.

The W-net and F-net are interconnected in the FON board, which makes it possible to

interconnect several F-nets via a W-net, see the small figure.

FON

FLI

WLI RF

CPU

FON

Local Remote

W-net F-net

FON