Huawei H805VDSA 24-Port VDSL2 Over POTS Service Board

The H805VDSA is a 24-Port VDSL2 over POTS service board. It works with the VDSL
transceiver unit-remote end (VTU-R) through the VDSL port to support the VDSL2 service.

Working principle of the H805VDSA board:

The basic working principle of the H805VDSA board is as follows:
* The control module loads the board software, controls the running of the board, and manages the entire board.
* The protection module protects and isolates the board from lightning strikes. The DC block isolates the direct current. The protector protects the high voltage.
* The forwarding module converts between ATM/PTM services and IP services, and also
supports flow control and scheduling.
* The interface module provides the ports for information exchange.
* The power module supplies power to each functional module of the board.
* The clock module provides clock signals for each functional module of the board.

The service process is as follows:
* In the upstream direction, the interface module converts the VDSL2 signals into a cell flow, aggregates the flow to the forwarding module, and then reorganizes the cell flow into ATM/PTM packets. The forwarding module encapsulates the reorganized ATM/PTM packets into IP packets and performs CAR on the IP packets. The IP packets are transmitted to the backplane bus through the backplane port and then to the control board. After being processed by the control board, the IP packets are transmitted upstream to the upper level device through the optical or electrical port.
* In the downstream direction, the forwarding logical decapsulates the IP packets from the
Ethernet, performs CAR on the IP packets, reorganizes the IP packets into ATM/PTM
packets, and transmits the ATM/PTM packets to the interface module. The interface
module converts the ATM packets into analog signals and transmits the signals to
subscriber lines.

Indicator of H805VDSA

VDSL2 service boards provide VDSL2 access services using their broadband ports.