H801MPWC Board
The H801MPWC board is a power board with dual DC power inputs. The
H801MPWC board leads in the -48 V DC power to the device.
Feature and Specifications
The H801MPWC board supports the following functions:
Two -48 V DC inputs
Filtering and current-limiting for the power input port
Detection of input undervoltage, power supply availability, and
power supply faults
Reporting of the protection alarm together with board ready status
Indication of power status
Parameters
Power Consumption and Maximum Frame Size of Boards
You can query power consumption, maximum frame size, and normal
operating temperature of all boards.
lists the power consumption and maximum frame size of boards. "-"
indicates N/A.
The operating temperature of all the boards is -40°C to +65°C. The
lowest board startup temperature is -25°C.
NOTE:
The power consumption of the board is tested in the following
conditions:
Working voltage: -53.5 V DC.
Ambient temperature: 25 °C.
Static power consumption: All ports do not carry any loads.
Specifically, users under POTS ports hang up phones, xDSL ports are
deactivated, and optical modules are not installed on optical ports
Maximum power consumption: All ports fully carry loads. However,
only 25% users under POTS ports concurrently pick up phones and the
feeding current is 20 mA.
The board power consumption slightly varies with the power module
configured for the board and discreteness of components.
Table 1 Power consumption and maximum frame size of boards
Board | Power Consumption | Maximum Frame Size |
Power interface board (MPW) |
H801MPWC | Static: 2.5 W Maximum: 2.5 W | - |
Working Principle
Figure 1 Working principle of the H801MPWC board
The basic working principle of the H801MPWC board is as follows:
The H801MPWC board leads in the -48 V power input through the 3V3
power connector, and transfers the power to the current limit
protection circuit, then to the filter circuit, and finally to the
backplane, supplying power to the subrack and other boards.
The detection and reporting circuit checks the protection fuse for
any faults, and reports the detection signals together with the
board ready status signal to the control board. The control board
indicates these detection signals through indicators.
The detection and reporting circuit checks for input undervoltage
and availability of power supply.
The E2PROM circuit stores the board manufacture information.
The H801MPWC board leads in the 3.3 V power from the backplane to
power certain internal chips of the board.
Front Panel Port
Indicator
Indicator | Name | Status | Meaning |
PWR0/PWR1 | The power board indicator | Green: on | The power board works properly |
Green: off | The power board is faulty |
