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Post by richa11verma on May 2, 2013 4:55:22 GMT
Can Inter Frame Space be set as a variable?
Why it is considered 150 micro Sec?
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Post by anamikas on May 2, 2013 8:35:20 GMT
Can Inter Frame Space be set as a variable? Why it is considered 150 micro Sec? Are you talking about DCF interframe space??? |
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Post by Akhil Kumar on May 2, 2013 9:47:58 GMT
Can Inter Frame Space be set as a variable? Why it is considered 150 micro Sec? Are you talking about DCF interframe space??? No Anamika, Richa is talking about Inter Frame Space which means time gap between last bit of first packet and start bit of adjacent packet. Richa, T_IFS can't be set as a variable, it is constant as 150us. This is what TI says about usage of T_IFS - "This would make it impossible to make the hardware work [without T_IFS], as the Tx chain being powered down would interfere with the Rx chain being powered up. It would have been possible to reduce T_IFS, but this would have put harder requirements on the hardware manufacturers. A system with modified T_IFS would not be able to communicate with Bluetooth compliant systems having T_IFS of 150 us." |
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Post by richa11verma on May 2, 2013 9:48:47 GMT
Can Inter Frame Space be set as a variable? Why it is considered 150 micro Sec? Are you talking about DCF interframe space??? I am asking for Air Interface Protocol's Inter Frame Space. |
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Post by richa11verma on May 2, 2013 10:38:12 GMT
Are you talking about DCF interframe space??? No Anamika, Richa is talking about Inter Frame Space which means time gap between last bit of first packet and start bit of adjacent packet. Richa, T_IFS can't be set as a variable, it is constant as 150us. This is what TI says about usage of T_IFS - "This would make it impossible to make the hardware work [without T_IFS], as the Tx chain being powered down would interfere with the Rx chain being powered up. It would have been possible to reduce T_IFS, but this would have put harder requirements on the hardware manufacturers. A system with modified T_IFS would not be able to communicate with Bluetooth compliant systems having T_IFS of 150 us." What do you mean by "powered up" and "powered down"? |
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Post by Akhil Kumar on May 3, 2013 3:11:18 GMT
No Anamika, Richa is talking about Inter Frame Space which means time gap between last bit of first packet and start bit of adjacent packet. Richa, T_IFS can't be set as a variable, it is constant as 150us. This is what TI says about usage of T_IFS - "This would make it impossible to make the hardware work [without T_IFS], as the Tx chain being powered down would interfere with the Rx chain being powered up. It would have been possible to reduce T_IFS, but this would have put harder requirements on the hardware manufacturers. A system with modified T_IFS would not be able to communicate with Bluetooth compliant systems having T_IFS of 150 us." What do you mean by "powered up" and "powered down"?
while receiving, others are only used while transmitting, and some are
used in both cases. For instance, there is a power amplifier (PA) to
amplify the transmitted signal before it goes on the air, and another
amplifier, the LNA (low-noise amplifier) used to amplify the weak signal
coming from the antenna before further processing. These modules must
be powered on and off, and that can take some microseconds. If the PA is
still on while the receiver is running, for instance, this would cause
excessive noise on the LNA input, blocking the receiver from seeing the
signal from the antenna.
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Post by richa11verma on May 3, 2013 7:06:32 GMT
What do you mean by "powered up" and "powered down"?
while receiving, others are only used while transmitting, and some are
used in both cases. For instance, there is a power amplifier (PA) to
amplify the transmitted signal before it goes on the air, and another
amplifier, the LNA (low-noise amplifier) used to amplify the weak signal
coming from the antenna before further processing. These modules must
be powered on and off, and that can take some microseconds. If the PA is
still on while the receiver is running, for instance, this would cause
excessive noise on the LNA input, blocking the receiver from seeing the
signal from the antenna.
Ok, I got your point! |
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