H838ASPB and H839ASPB Board Description

H838ASPB and H839ASPB are 64-channel POTS service boards that provide the POTS access service.

Functions and Specifications

For details, see Voice Service Boards Specifications.

 NOTE:

Compared with H838ASPB, H839ASPB supports direct current-isolated (DC-I) grounding.

Power Consumption

For details, see Board Power Consumption.

Working Principles

Figure 1 shows working principles of the H838ASPB and H839ASPB boards.

Figure 1 Working principles of the H838ASPB and H839ASPB boards

Basic working principles of the H838ASPB and H839ASPB boards are as follows:

• The codec module encodes and decodes voice signals and converts analog signals to digital signals.

• The subscriber-line interface module provides access to 64 channels of POTS services.

• The protection module protects and isolates these boards from lightning strikes.

• The MCU module processes the upper-layer protocol messages between these boards and the control board and manages user ports on these boards.

• The power module supplies power to other function modules of these boards.

Front Panel Port

Indicator

Pin Assignments

Table 1 describes pin assignments of the PSTN0 port on the front panel of the H838ASPB or H839ASPB board.

Table 2 describes pin assignments of the PSTN1 port on the front panel of the H838ASPB or H839ASPB board.