Huawei OptiX OSN 9800 OTM Node Configuration

Huawei OptiX OSN 9800 OTM Nodes apply to terminal sites.

An OTM node can be either an 80-wavelength or a 40-wavelength system.

• 80-wavelength system:
  When serving as an 80-wavelength system, an OTM node optical multiplexer, demultiplexer, and ITL boards. The OTM node can be expanded to provision 80 wavelengths without interrupting services.
• 40-wavelength system:
  When serving as a 40-wavelength system, an OTM node optical multiplexer and demultiplexer boards. The OTM node can be expanded to provision 40 wavelengths without interrupting services.

Signal Flow

In the receive direction:

• The line signal received from west is separated into an optical supervisory signal and a main-path optical signal. The optical supervisory signal is sent to the optical supervisory channel (OSC) board for processing, and the main-path optical signal is sent to an amplifier board for amplification.
• The ITL board splits the amplified main-path optical signal into a C_EVEN multiplexed wavelength signal and a C_ODD multiplexed wavelength signal. The C_EVEN and C_ODD multiplexed wavelength signals each are sent to a demultiplexer board and are further separated into individual wavelengths. The wavelengths are sent to the corresponding line boards and then to local client equipment.

The signal flow in the transmit direction is the reverse of this process.

Figure 1 Signal flow of an 80-wavelength OTM node 

Subrack Layout

Table 1 Configuration principles for the optical layer of an OTM node

Board Type	Configuration Principle
Optical multiplexer  and demultiplexer  boards	For an 80-wavelength OTM node, configure ITL boards. In an integrated system, configure the M40V if the APE function is required. In an open system or a mixed system, if more than 16  wavelengths are provisioned, configure the M40V. If 16 or  fewer wavelengths are provisioned, configure the M40 and VA1s or VA4s. If the system does not require the APE function, configure the M40.
Optical amplifier  (OA) board	Principles for configuring OA boards: Low power amplifiers are preferred. Common power amplifiers are preferred to high power amplifiers with the maximum output optical power of 23 dBm or higher. High power amplifiers are preferred to Raman amplifiers. Raman amplifiers are preferred to HBA amplifiers. For a coherent system, Raman amplifiers are preferred. The OA board with maximum output optical power of 20 dBm must be configured at the receive end. OA boards must be configured on both sides of a subrack. Specifically, the OA boards at the receive and transmit ends in the same direction must be configured on the same side of a subrack.
Cross-connect board and system control board	When OptiX OSN 9800 universal platform subracks are cascaded in master-slave mode, configure redundancy protection for the SCC in the master subrack. Install the SCC in slot IU1. If there is a standby SCC, install the standby SCC in slot IU2. When the OptiX OSN 9800 universal platform subracks is used as a slave subrack, the SCC board cannot be configured.
Optical supervisory  channel (OSC) board	An OSC board is required in each direction of an OTM node.  For an 80-wavelength OTM node, two SC1s or one SC2 can be configured. When the orderwire is used, the OSC board where the orderwire is provisioned must be installed in the master subrack.
Spectrum analyzer  board	For an 80-wavelength system, a WMU board must be configured if OTU boards in the system use fixed-wavelength optical modules. If optical signal-to-noise ratio (OSNR) detection for signals at 10 Gbit/s is required, the MCA board must be configured. When WMU and MCA/OPM boards are required for an OTM node, configure WMU boards prior to MCA/OPM boards. If an OA board exists at the transmit end, the WMU board must connect to  the MON port on the FIU board and the MCA or OPM board must connect to the MON port on the OA board. If no OA board exists at the transmit end, the WMU board must connect to  the MON port on the ITL board and the MCA or OPM board must connect to the MON port on the FIU board. When only MCA/OPM boards are required for an OTM node, the MCA4 boards are most preferred. It is preferred to connect an MCA/OPM board to the MON port on an optical amplifier board or an FIU board. Automatic deployment commissioning: An MCA4/MCA8/OPM8 board must be configured and must be connected  to the MON port on an OA board with direct connections to an FIU board. If OSNR detection for signals at 10 Gbit/s is not required, the OPM8 board  is preferred. When there are five or more fiber spans between two power equalization sites, an MCA4/MCA8/OPM8 board must be configured at a site in the middle of the spans (site number = number of spans/2±0.5), both for the transmit and receive OAs. When there are four or fewer fiber spans between two power equalization sites, an MCA4/MCA8/OPM8 board must be configured at the transmit end and can be configured at the receive end as required.

Typical Configuration

The typical configurations for the optical layer of an 80-wavelength OTM node are shown in Figure 1. Two OptiX OSN 9800 universal platform subracks are required.

Figure 1 Typical configurations for the optical layer of an 80-wavelength OTM node 

Subrack Connections

This topic provides fiber connections between optical subracks of an 80-wavelength OTM node.

Figure 1 shows the fiber connections between west optical subracks of an example 80-wavelength OTM node.

Figure 1 Fiber connections between west optical subracks of an 80-wavelength OTM node 

Below are some boards related to the Huawei OptiX OSN9800 OTM Node:

TN97ITL04	ITL: interleaver board(Extended C-band)
TN11ITL06	ITL06: Interleaver board(Extended C-band) , TN11ITL04: interleaver board(C Band)
TN12M40	M40: 40-port multiplexer board
TN12M40V	M40V: 40-port multiplexer board with VOAs
TN13FIU	FIU: fiber interface unit
TN16FIU	FIU: fiber interface unit
TN13OAU1	OAU1: optical amplifier unit
TN97ITL04	ITL: interleaver board(Extended C-band)
TN11ITL06	ITL06: Interleaver board(Extended C-band) , TN11ITL04: interleaver board(C Band)
TN12D40	D40: 40-port demultiplexer board

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