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OptiX OSN 9800 M24 Fan and Power description


An OptiX OSN 9800 M24 subrack contains two fan tray assemblies, each of which has four dual-fan conjoined modules. There is an air filter at the bottom of the OptiX OSN 9800 M24 subrack. The air filter can be directly removed for cleaning.


The fan tray assembly has only one functional version: TNG1.

Functions and Features

Table 1 describes the functions of fan tray assemblies.

Function Description
Basic function Dissipates heat generated by subracks so that they can function within the designated temperature range.
Fan speed control
  • Auto Speed mode: When fans work in this mode, the fan tray assemblies automatically regulate fan speeds, depending on the subrack temperature.
  • Adjustable Speed mode: When fans work in this mode, the user can manually adjust the fan speeds.
Heat dissipation by section A subrack is divided into two sections for better heat dissipation. The speed of the fans in each section can be independently adjusted based on the board temperature of the subrack.
Hot swapping Fan tray assemblies are hot swappable.
Alarming Detects and reports fan alarms and online/offline information about fans.
Status detection Checks and reports fan status.
Power management Adjusts the maximum power of the fan tray assembly.


Fan Speed Mode

Two fan speed modes are supported: auto speed mode and adjustable speed mode, as described in Table 2. The auto speed mode is recommended.

Table 2 Fan speed mode

Fan Speed Mode Description
Auto speed The fans automatically adjust their speeds.

When the board temperature is within the specified range, the fans intelligently adjust their speeds to ensure stable heat dissipation for boards while ensuring low noise and energy consumption.

Adjustable speed Six fan speed levels are supported in this mode: Low SpeedMedium-Low SpeedMedium SpeedMedium-High Speed, and High Speed. The user adjusts the fans in each fan tray assembly to rotate at the same speed. The user cannot adjust the speed for individual fans.


Each fan tray assembly can be divided into the left and right areas. Fans in the same area have the same power consumption and speed, and different areas are independent of each other.


Functional Block Diagram

Each fan tray assembly contains eight fans (collectively referred to as FAN) and one fan control unit. Figure 1 shows the functional block diagram of the fan tray assembly.

Figure 1 Functional block diagram of the fan tray assembly 
Figure 1 Functional block diagram of the fan tray assembly 
  • FAN: dissipates heat generated by the subrack during normal operations. It is the core component of the fan tray assembly.
  • Fan control unit:
    • Controls fan speeds based on the fan speed regulating signals.
    • Detects faults. When detecting that a fan in the fan tray assembly is faulty, the fan control unit reports an appropriate alarm message.
    • Monitors the speed regulating signal, the fan status, and the online/offline information of the fan tray assembly.


Figure 2 shows the appearance of a fan tray assembly in the subrack.

Figure 2 Fan tray assembly 
Figure 2 Fan tray assembly 
1. FAN hardware status indicator 2. Dual-fan conjoined module (four modules in total)


A FAN hardware status indicator is present on the front panel of the FAN: STAT: red, green, or yellow depending on the FAN hardware status when power is present on the fan tray assembly.

An air filter is installed on the fan tray assembly to prevent dust from entering the subrack.

Valid Slots

The fan tray assembly occupies one slot in the subrack. In the OptiX OSN 9800 M24 subrack, the valid slots for the fan tray assembly are IU90 and IU91.


  • Mechanical specificationsDimensions (H x W x D): 47.0 mm (1.9 in.) x 452.8 mm (17.8 in.) x 273.2 mm (10.8 in.)Weight: 3 kg (6.6 lb)
  • Life span of the fan tray assembly

Table 3 Life span of the fan tray assembly

Board Parameter Specification
TNG1FAN Life span The average life span of a fan tray assembly varies depending on the actual environment. Environments can be classified as follows:

  • Class A environment: refers to the indoor environment where the ambient temperature and humidity are controlled (including inhabited rooms).
  • Class B environment: refers to the indoor environment where the ambient temperature and humidity are not controlled or the common outdoor environment where only simple shelter (such as awning) is available and the humidity occasionally reaches 100%.

The average life spans of fan tray assemblies in different environments are as follows:

  • Class A environment: 6.5 years
  • Class B environment: 5 years


The previous life spans are the average values concluded based on the test data in a lab and the theoretical model, rather than the actual values. They are for reference only. The actual life span must be determined based on the environment conditions of a specific area. In addition, the previous life spans do not indicate that a fan tray assembly becomes unavailable immediately at the end of its life span. They are used to prompt users to replace the fan tray assembly in time.


Operating specifications of the fan tray assembly

Table 4 Operating specifications of the fan tray assembly (maximum average power consumption of 280 W)

Board Parameter Specification
TNG1FAN Power consumption and heat consumptiona Rotation speed Power consumption Heat consumption
Low speed 20 W 4 W
Medium-low speed 38 W 7.6 W
Medium speed 75 W 15 W
Medium-high speed 125 W 25 W
High speed 280 W 56 W


Power Consumption

This topic provides the subrack power consumption specifications.

Table 5 Power consumption of the 9800 M24 with typical configurations

9800 M24Power Distribution Type Typical Configuration Remarks Power Consumptiona(W)
  • 1+1 63 A
  • 2+2 63 A


Typical Power Consumption: 951 W

Maximum Power Consumption: 1354 W

2 2×FAN+4×PIU+EFI+2×CXP+2×TNG1T212


Typical Power Consumption: 1717 W

Maximum Power Consumption: 2150 W



Typical Power Consumption: 1195 W

Maximum Power Consumption: 1610 W

4 2×FAN+4×PIU+EFI+2×CXP+2×TNG1T212


Typical Power Consumption: 1424 W

Maximum Power Consumption: 1843 W

5 2×FAN+4×PIU+EFI+2×CXP+2×TNG1T212


Typical Power Consumption: 1925 W

Maximum Power Consumption: 2368 W

  • 2+2 63 A
6 2×FAN+4×PIU+EFI+2×CXP+14×TNG1A212


Typical Power Consumption: 2789 W

Maximum Power Consumption: 3298 W

a: The power consumption of the subrack is for a typical configuration. This value is for reference only. The actual power consumed by the subrack is calculated based on the power consumption of each module. The maximum power consumption is the power consumed by the board when it works normally under the highest ambient temperature.


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