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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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L3000N Folha de dados(PDF) 11 Page - STMicroelectronics |
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L3000N Folha de dados(HTML) 11 Page - STMicroelectronics |
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11 / 32 page  If, for example, the loop resistance is 400 Ω the GDK output will be 0 only when the limiting current value is 40 or 25mA. The card controller can program consecutive Test Mode and Conversation Mode with different limiting current in order to individuate the range of loop re- sistance as shown in the flow chart of fig. 6. The information of the Loop Resistance Range can be very useful to optimize the transmission characteristics of the Line Card to each line. For example, if a second generation COMBO like TS5070 is used the Card Controller can use this information to change the Tx, RX Gains and echo cancellation characteristics into the programma- ble COMBO improving the quality of the system. Limiting Current GDK = 0 GDK = 1 60mA 40mA 25mA (0 – 300) ohm (0 – 650) ohm (0 – 1300) ohm >300 ohm >650 ohm >1300 ohm Figure 6: Procedure for Loop Resistance Evaluation. L3000N - L3092 11/32 |
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