What is the UPM for OptiX OSN series equipment

The UPM can directly convert 110 V/220 V AC power into –48 V DC power that the transmission equipment requires and is suitable for the telecom carriers who cannot provide –48 V DC power for the equipment or telecom carriers who require storage batteries.

Application of the UPM on the OptiX OSN equipment series.


The UPM consists of the rectifier module, monitoring module, and DC/AC power distribution frame. The rectifier module and monitoring module are hot-swappable so that faulty modules can be replaced without the system being shut down.

The storage batteries of the UPM work with one ETP4890 power system or one EPS75-4815AF power system. When the external AC power system supplies power normally, the batteries store power. When the 110 V/220 V AC power supply is interrupted, the batteries can supply power for 4 hours. To supply power to the OptiX OSN equipment, only one power system is required to be connected to the batteries.


Functions and features of the ETP4890.

Table 1 Functions and features of the ETP4890 power system

Function and Feature


Basic function

Converts 220 V AC power input to -48 V DC power output.

Power system configuration

AC power distribution

Supports 85 V to 300 V AC input voltages

Rectifier module

·         Supports a maximum of three rectifier modules.

·         Supports the 90 A rectifier module type.

DC power distribution

Provides 47.0 V DC to 56.5 V DC power outputs, with 53.5 V DC by default.

Power monitoring unit (PMU)

·         Regulates rectifier module voltages and currents.

·         Powers on or off the rectifier module.

·         Manages batteries.

·         Monitors battery status when being configured with a temperature sensor.

Storage battery

Provides a valve regulated lead-acid battery (48 V/65 Ah/12 V-cell batteries).

Installation and maintenance

·         Allows users to perform operations and maintenance using the front panel.

·         Supports simple operations on the LCD.

·         Provides the hot-swappable rectifier module and monitoring module.


Functions and features of the EPS75-4815AF.

Table 2 Functions and features of the EPS75-4815AF power system

Function and Feature


Hot-swappable function

The AC/DC rectifier module of the UPM is hot-swappable. When you replace a faulty rectifier module, the other rectifier module can still work normally. Therefore, the maintainability of the system is improved.

Storage battery protection function

The UPM provides the storage battery protection function. When the mains supply is interrupted, the power system of the equipment automatically switches to the storage battery, which ensures that the equipment operates normally. The battery module provides a capacity of 40 to 500 Ah. The default capacity is 65 Ah.

Lightning-proof function

The rectifier module is embedded with the lightning-proof protector. The rectifier module can bear ±5 lightning-simulated surges with an 8/20 μs current waveform at the amplitude of 5 kA. When the lightning current enters the rectifier module along with the power cable, install category-C and category-B light arresters before you connect the AC mains supply to the power system to prevent the overvoltage caused by the direct lightning strike from damaging the rectifier module.


The storage batteries do not belong to the ETP4890 or EPS75-4815AF power system. They need to be configured separately. If the batteries are required, a battery cabinet is provided generally or a dedicated space in the equipment cabinet is reserved for the batteries.

When the UPM works normally, the monitoring module controls the rectifier module, storage battery loop, and load loop, which work according to the preset parameters or user settings. The monitoring module also monitors the status and data of the rectifier module, storage battery loop, and load loop.

In the case of a mains supply failure, the equipment is fed by the storage battery group that is connected to the UPM. The battery group must be connected to the UPM before the mains supply fails. When the batteries start to discharge due to a mains supply failure, the monitoring module reports the no-mains-supply alarm. With the discharge of the batteries, the battery voltage starts to drop. When the battery voltage is lower than 45 V, the monitoring module reports the DC undervoltage alarm. When the battery voltage reaches 43 V, the battery group enables the power-off protection function to interrupt the connection between the battery group and the equipment. As a result, the batteries are automatically protected.

When the mains supply is restored, the UPM resumes normal operations.

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