Version Description

The available hardware version of the SCS is TNF1.

Version

Table 1 describes the version mapping of the SCS board.

Table 1 Version mapping of the SCS board

Type

Table 2 describes the available variants of the SCS board.

Table 2 Available variants of the SCS board

Application

The SCS board provides client 1+1 protection.

Figure 1 shows the SCS board application in the WDM system.

Figure 1 SCS board application in the WDM system 

 NOTE:

An OTU is a transceiver that can process transmitting signals and receiving signals over the same wavelength at the same time.

Functions and Features

The SCS board provides client 1+1 protection.

For detailed functions and features, see Table 1.

Table 1 Functions and features of the SCS

Working Principle and Signal Flow

The SCS board consists of three parts: the optical module and the communication module.

Figure 1 is the functional block diagram of the SCS board.

Figure 1 Functional block diagram of the SCS board 

Signal Flow

One SCS board supports the dual-fed and dual receiving of two channels of optical signals. The SCS board processes the two channels of optical signals in the same way. This topic describes the service flow of only one channel of optical signals.

Transmit direction

The TI1 optical port receives one channel of optical signals. After passing through the splitter, the signals are output to the working and the protection channels through the TO11 and TO12 optical ports.

Receive direction

The signals in the working and the protection channels are input through the RI1 and RI2 optical ports, and enter the coupler. The system activates one of the two channels of optical signals based on the service quality. In this way, the selection of path optical signals is achieved. The selected optical signals are output through the RO1 optical port.

Normally, the working OTU at the receive end is active, and the protection OTU is standby. Once a fault occurs in the services, an alarm triggers a protection switching. The system shuts down the working OTU, and activates the protection OTU.

Module Function

Optical module

The optical module consists of splitters and couplers.

The splitter divides the one channel of optical signals into two channels of the same power, and outputs them to the working and protection channels.

The coupler receives the signals in the working and the protection channels. The system selects one channel of optical signals based on the service quality.

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 and Figure 2 show the front panel of the SCS.

Figure 1 Front panel of the SCS01 

Figure 2 Front panel of the SCS02 

Indicators

The SCS board does not have indicators.

Ports

There are 12 optical ports on the front panel of the SCS board. Table 1 lists the type and function of each port.

Table 1 Types and functions of the SCS ports

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 SCS occupies one slot.

Table 1 shows the slots for housing the SCS board.

Table 1 Mapping between the slots for housing the SCS board and the logical slots on the NMS

Optical Ports

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

Display of Optical Ports

Table 1 lists the serial numbers displayed in the NMS system for the optical ports on the SCS board front panel.

Table 1 Display of the SCS 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.

SCS Parameters

SCS Specifications

Specifications include optical specifications, mechanical specifications and power consumption.

Optical Specifications

Table 1 list the optical specifications of the SCS.

Table 1 Optical interface parameter specifications of the SCS board specifications

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