HUAWEI AUX SL91 Auxiliary Interface Board System Auxiliary Interface Board

The functional version of the AUX is SL91.

Functions and Features:

The AUX provides the system with one orderwire phone port, one synchronous data port, one asynchronous data port, and one four-input/two-output external alarm port.

Table 1 lists the functions and features that the AUX supports.

Table 1 Functions and features

Working Principle:

The AUX consists of the orderwire unit, logic control unit, and clock unit.

Functional Block Diagram

Figure 1 Functional block diagram of the AUX

Power Supply Unit

Receives the +3.3 V power supply from the backplane and supplies it to the other units on the AUX.

Receives and shuts down control signals.

Orderwire Unit

Supports the input of four channels of alarms.

Supports the output of two channels of alarms.

Provides one orderwire port.

Provides one 64 kbit/s synchronous transparent data port.

Provides one 19.2 kbit/s asynchronous transparent data port.

NOTE:

The 64 kbit/s synchronous data port can transparently transmit orderwire byte. One port, however, can implement only one of the two functions: 64 kbit/s synchronous data port and transparent transmission of orderwire byte.

Logic Control Unit

Provides an interface with the CPU unit and works with the CPU unit to implement the board control function.

Processes orderwire bytes and overhead bytes.

Processes clock signals.

Provides board status information.

Checks the status of the system control, switching, and timing board.

Checks the status of the clock.

Supports the switching of system clock reference sources automatically and by running specific commands.

Supports the detection and reporting of the key clock status of each board in the system.

Board Status Detection Unit

Detects board performance data such as board voltage.

Stores board manufacturing information.

Clock Unit

Provides clock signals to the logic control unit.

Front Panel:

There are indicators, management ports, and auxiliary ports on the front panel.

Front Panel Diagram

Figure 1 shows the appearance of the front panel of the AUX.

Figure 1 Front panel of the AUX

Indicators

Table 1 Status explanation for indicators on the AUX

Auxiliary Ports and Management Ports

Table 2 Description of the auxiliary ports and management ports

The auxiliary ports and management ports use RJ45 connectors. The pin assignments for the ports, however, are different. Figure 2 shows the front view of an RJ45 connector.

Figure 2 Front view of an RJ45 connector

Table 3 provides the pin assignments for the F1/S1 port.

Table 3 Pin assignments for the F1/S1 port

For the pin assignments for the ALMI and ALMO ports, see Table 4 and see Table 5.

Table 4 Pin assignments for the ALMI port

Table 5 Pin assignments for the ALMO port

External alarms are also called housekeeping alarms or relay alarms. OptiX RTN 910A provides external alarms.

Figure 3 shows an interface circuit for external alarm input. When the relay of the external system is switched off, the IDU interface circuit detects a high-level signal. When the relay of the external system is switched on, the IDU interface circuit detects a low-level signal. The board generates corresponding alarms based on the level signals detected by the IDU interface circuit. External alarm input mainly achieves access of the relay alarms generated by the environmental alarm generator.

Figure 3 Interface circuit for external alarm input

Figure 4 shows an interface circuit for external alarm output. When the external alarm output conditions are met, the equipment switches on or off the relay depending on the conditions that result in the alarm. External alarm output helps to provide equipment alarms to the centralized alarming device.

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