LBI-39101

BOARD SET-UP

 

 

 

Table 3 – Digital Pots

(Continued)

 

 

 

 

 

AUDIO

ENHANCED AUDIO ENCLOSURE AUDIO CIRCUIT LOCATED IN /

TYPICAL

SYSTEM BD.

SETTING

ADJUSTS *

 

POT NO.

 

 

**

 

 

 

 

 

 

 

 

 

23

Unselect Speaker 2 Output

 

128

 

Adjusts level of audio applied to the second unselect speaker (unselect speaker 2). This

 

 

pot is not used as a volume control.

 

 

 

 

 

 

24

Unselect Speaker 3 Output

 

128

 

Adjusts level of audio applied to the third unselect speaker (unselect speaker 3). This

 

 

pot is not used as a volume control.

 

 

 

 

 

 

22

Unselect/Telephone Recorder Output

 

175

 

Adjusts level of audio applied to the unselect recorder. This audio may be from an

 

 

unselect source or from the Call Director's telephone line.

 

 

 

 

 

2

Call Director Output

 

130

 

Adjusts level of audio to Call Director's telephone line (from radio). Also see pot 18.

 

 

 

 

 

25

Supervisor Headset Earphone Output

 

20

 

Adjusts level of audio applied to the supervisor headset earphones. This pot is not used

 

 

as a volume control.

 

 

 

 

 

 

26

Operator Headset Earphone Output

 

20

 

Adjusts level of audio applied to the operator headset earphones. This pot is not used as

 

 

a volume control.

 

 

 

 

 

 

 

 

 

 

*See Audio System Board maintenance manual for specific test points and additional alignment information.

**Numbers represent typical digital pot settings only. Factory settings are subject to change without notice as circuit improvements occur. DO NOT ADJUST any digital pot from factory setting unless a full understanding of the consequences is known.

Specifically, with the volume control fully counterclockwise and a nomimal audio level of 436 millivolts rms at a frequency of 1kHz from the Enhanced Audio Enclosure, the audio output level from the speaker will not drop below approximately 0.38 milliwatts or 55 millivolts rms across the 8-ohm speaker. This wattage figure assumes SW1 position 2 is also "OFF" or "OPEN", selecting the 2-watt maximum volume level. With SW1 position 2 selecting 5-watts, the minimum volume level is approximately 1.25 milliwatts or 100 millivolts across the 8- ohm speaker.

When SW1 position 1 is "ON" or "CLOSED", the minimum volume level feature is disabled and audio from the speaker may be completely turned off by rotating the volume control fully counterclockwise. This setting should be used with caution since calls, especially calls on unselect audio channels, are more likely to be missed.

Maximum Volume Level DIP Switch (SW1 Position 2)

SW1 position 2 allows setting of the speaker's maximum volume level to either 2 or 5 watts of output power. Normally, the factory setting is 2 watts. This level is

recommended, as it should be adequate in nearly all dispatch environments. The 2-watt setting is selected by setting the switch "OPEN" or "OFF". When the switch is "CLOSED" or "ON", the maximum output power is increased to approximately 5 watts.

Both wattage figures assume the volume control on the Speaker Assembly's front panel is set at maximum (fully clockwise) and a nominal audio signal input level of 436 millivolts rms at a frequency of 1 kHz is applied to the Speaker Assembly.

ON

1 2 3 4

FigureG￿3 − Speaker Amp Board SW1 Factory Setting

At this time, configure SW1 as required. If the Speaker Assembly is a desktop (with case) style, disassemble it by removing the four (4) screws from the back of the case and then separate the case's front and rear sections.

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Ericsson LBI-39101A manual Maximum Volume Level DIP Switch SW1 Position, FigureG3 − Speaker Amp Board SW1 Factory Setting
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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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