BOARD SET-UP

LBI-39101

Digital Pots Settings

To provide computer-controlled level settings, the Enhanced Audio Enclosure's audio input and audio output circuits incorporate 256-position digitally-controlled potentiometers. These digital pots, located on the Audio System Board, allow adjustment of the Enhanced Audio Enclosure's audio levels via the PC. Adjustments include dispatcher-adjustable audio levels such as headset sidetone volumes and system-level adjustments such as line input and output levels to and from the CEC/IMC Digital Audio Switch.

With the exception of the dispatcher's headset sidetone volume adjustments, none of the digital pots provide volume adjustments for the speaker or headset earphone audio levels during normal dispatch operations. Speaker and headset volume adjustments are accomplished at the respective speaker or headset via mechanical pots. Also see the following note.

NOTE

Communication module volume changes at the C3 Maestro effect CEC/IMC CIM line output levels, not the digital pots within the Enhanced Audio Enclosure.

Fifteen (15) dual digital potentiometer chips (integrated circuits) are located on the Audio System Board for a total of thirty (30) individual pots; there are no mechanical potentiometers. All audio level adjustments are accomplished via software. See Table 3. A dispatcher may adjust the operator's sidetone digital pot using dedicated keyboard keystrokes <Alt> <Vol − > and <Alt> <Vol ↓ > at the Dispatch Keyboard.

All of the digital pots initially power-up with the wiper in a 50% or centered position. The microcontroller on the Audio System Board then immediately loads each pot in accordance with its respective setting stored in a "working" area of a serial EEPROM chip on the board. The EEPROM also contains an unchangeable "default" digital pot storage area. When shipped from the factory, the working area matches the default area.

Digital pots may be adjusted using the C3 Maestro application program via one of its note cards. This function changes the settings stored in the EEPROM's working area. Normally, this note card function should only be accessed by the installation and/or service personnel. To change a digital pot's setting, the following procedure may be performed after the console's installation is complete and it has been powered-up:

1.From the Dispatch Keyboard, simultaneously press the <Alt> (common control function) and the # (on

numeric keypad) keys. "Digital Pot Number: ?" is displayed in the lower left-hand side of the C3 Maestro's display.

2.From the numeric keypad, enter the number of the digital pot to be changed. See Table 3. The digital pot's existing setting is displayed.

3.Press the − (increase) or ↓ (decrease) key to change the current setting. Changes are saved in the EEPROM's working area as they are made.

4.Press <Esc> to exit.

SPEAKER ASSEMBLY

Normally, a Speaker Assembly used with the Enhanced Audio Enclosure is configured at the factory with its minimum volume feature enabled and its maximum volume output power set to 2 watts. This configuration is accomplished by setting two positions on a 4-position DIP switch located on the Speaker Amp Board within the Speaker Assembly.

NOTE

The following information lists the normal factory settings and the optional settings which are available.

Speaker Amp Board

At each Speaker Assembly, a 4-position DIP switch identified as SW1 is located on the Speaker Amp Board. One position is used to enable or disable the minimum volume level feature. A second position allows setting of the maximum volume level to either 2 or 5 watts of output power. Factory settings are shown in Figure 3. These switches have no effect on headset earphone output levels. Currently, the other two DIP switch positions on SW1 are not used.

NOTE

NOTE

SW1 may have a tape seal placed over the switches to prevent changes.

Minimum Volume Level DIP Switch (SW1 Position 1)

When SW1 position 1 is "OFF" or "OPEN", the minimum volume level feature is enabled. This is the factory setting. With this setting, audio from the speaker cannot be completely turned off by rotating the volume control on the Speaker Assembly's front panel fully counterclockwise.

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Ericsson LBI-39101A manual Speaker Assembly, Speaker Amp Board, Digital Pots Settings
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LBI-39101A specifications

The Ericsson LBI-39101A is a robust and versatile base station designed to facilitate efficient communication networks. Known for its reliable performance, the LBI-39101A plays a crucial role in enhancing the connectivity landscape for mobile operators. This equipment supports a range of technologies, making it an ideal choice for operators aiming to deliver high-quality services in both urban and rural environments.

One of the key features of the LBI-39101A is its support for multiple frequency bands, allowing it to operate across various spectrum allocations. This flexibility enables mobile operators to effectively manage their frequency resources and optimize network performance. Additionally, the base station is designed to support both 2G and 3G technologies, making it a valuable asset for operators transitioning to newer standards while still catering to older devices in their network.

The LBI-39101A also incorporates advanced receiver and transmitter technology, which enhances its ability to handle high traffic loads and support a larger number of simultaneous users. This capability is crucial in densely populated areas where network demand is high. The base station's design also emphasizes energy efficiency, reducing both operational costs and environmental impact, which is becoming increasingly important in today's eco-conscious world.

Another notable characteristic of the LBI-39101A is its modular architecture. This design allows for easy upgrades and scalability, enabling operators to expand their network capabilities without the need for extensive infrastructure overhauls. The base station can accommodate future enhancements seamlessly, ensuring that it remains competitive as technology evolves.

Moreover, the LBI-39101A includes built-in support for advanced features such as MIMO (Multiple Input Multiple Output) technology, which improves data throughput and reliability. This is particularly significant as mobile data consumption continues to rise, placing immense pressure on existing networks. The MIMO capability allows for enhanced spectral efficiency, which is crucial for maximizing the available bandwidth.

In summary, the Ericsson LBI-39101A stands out as a powerful base station with a host of features designed for modern mobile communication. Its support for multiple technologies, energy efficiency, modular design, and advanced MIMO capabilities make it an excellent choice for operators looking to enhance their networks and provide superior connectivity for users. As the mobile landscape evolves, the LBI-39101A is poised to remain a key player in facilitating seamless communication.
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