The available hardware version of the FIU: TNF1 , TNF2.

Version

Table 1 describes the version mapping of the FIU board.

Table 1 Version description of the FIU

Application

The FIU is mainly used to multiplex and demultiplex the main path and the optical supervisory channel (OSC).

For the application of the board in WDM systems, see Figure 1.

Figure 1 FIU board application in a WDM system

NOTE:

An OTU is a transceiver that can transmit and receive signals over the same wavelength at the same time.

Functions and Features

The main functions and features supported by the FIU are multiplexing or demultiplexing.

For detailed functions and features, see Table 1.

Table 1 Functions and features of the FIU board

Working Principle and Signal Flow

The FIU unit consists of the following parts: optical module, optical power detection module, and communication module.

Figure 1 is the functional block diagram of the TNF1FIU board. Figure 2 is the functional block diagram of the TNF2FIU board.

Figure 1 Functional block diagram of the TNF1FIU board

Figure 2 Functional block diagram of the TNF2FIU board

Signal Flow

The multiplexing module multiplexes the main path optical signals received through the RX optical port and the supervisory optical signals received through the SI optical port into one channel of optical signals. The one channel of signals is output through the OUT optical port.

The IN optical port receives line optical signals, which are then sent to the demultiplexing module. The module demultiplexes the line optical signals into the main path optical signals and supervisory channel signals, and outputs them through the TX and SO optical ports respectively.

Module Function

Optical module

Performs the multiplexing and demultiplexing of main path signals and supervisory channel signals.

Optical power detection module

Detects input optical power of service signals in a timely manner.

NOTE:

Only the TNF2FIU board supports the detection of input optical power.

Communication module

Communicates with the system control, switching, and timing board, to control and operate on each module of the unit.

Front Panel

There are ports on the front panel of the board.

Appearance of the Front Panel

Figure 1 shows the front panel of the FIU board.

Figure 1 Front panel of the FIU board

Indicators

The FIU board does not have indicators.

Ports

Table 1 lists the type and function of each port.

Table 1 Ports on the front panel of the FIU

Laser Hazard Level

The laser hazard level of the board is HAZARD LEVEL 1M, indicating that the maximum power launched by the board ranges from 10 dBm (10 mW) to 21.3 dBm (136 mW).

Valid Slots

The FIU occupies one slot.

Table 1 Valid slots for the FIU board

Display of Slots

On the U2000, the board occupies one logical slot.

When the board is installed in the 1800 I chassis, 1800 II chassis, the slot number displayed on the U2000, Web LCT, or in the command line represents the slot housing the board.

When the board is installed in the 1800 OADM frame:

If the 1800 OADM frame works with the 1800 I chassis, the slot number displayed on the U2000, Web LCT, or in the command line is a digit ranging from 7 to 10.

If the 1800 OADM frame works with the 1800 II Compact chassis, the slot number displayed on the U2000, Web LCT, or in the command line is a digit ranging from 12 to 15.

When the board is installed in the 1800 V chassis, the slot number displayed on the U2000, Web LCT, or in the command line represents the slot housing the board.

Optical Ports

This topic describes the display of optical ports on the board.

Display of Optical Ports

Table 1 lists the sequence number displayed in an NMS system of the optical ports on the FIU board front panel.

Table 1 Display of the FIU optical ports

NOTE:

An optical port number displayed on the U2000 indicates a pair of actual optical ports, one for transmitting signals, and the other for receiving signals.

FIU Parameters on the NMS

This section lists the board parameters that can be set or queried by using the NMS.

For parameters of the FIU, refer to Table 1.

Table 1 FIU parameters

FIU Specifications

Specifications include optical specifications, mechanical specifications and power consumption.

Optical Specifications

Table 1 TNF1FIU board specifications in DWDM system