### Network

N

#### nick

Jan 1, 1970
0
if i have a transmitter(T) ,receiver(B,C,D) in Room (X)
(T) transmit a signal to (B,C,D) at the same frequency, but at
different channel, so that (T) can control (B,C,D) individually.
Room(Y) is nearby Room(B), i use the same set of above in Room(Y),
then Room(X)and Room(Y) ,use that system at same time , the signal of
(T) in Room(X) will transmit throught the wall and enter Room(Y).so
how to solve this problem?

like the radiotelephones ,in a flat every families can use the same
model radiotelephones , but the phone signals will not against each
others?

Sorry, my english is not good,so if the above explanation is not
clearly, i very welcome you ask me to explain again

thank you very much!

R

#### Rich Webb

Jan 1, 1970
0
if i have a transmitter(T) ,receiver(B,C,D) in Room (X)
(T) transmit a signal to (B,C,D) at the same frequency, but at
different channel, so that (T) can control (B,C,D) individually.
Room(Y) is nearby Room(B), i use the same set of above in Room(Y),
then Room(X)and Room(Y) ,use that system at same time , the signal of
(T) in Room(X) will transmit throught the wall and enter Room(Y).so
how to solve this problem?

like the radiotelephones ,in a flat every families can use the same
model radiotelephones , but the phone signals will not against each
others?

Because magic happens. Either there is a central controller that has
an off-band control channel which allocates resources as required to
eliminate interference or the users cooperate and agree to use
non-interfering channels.

In the case where there are never more than N systems within range of
each other, the systems could negotiate among themselves with discovery
and collision detection. As N gets large, a significant amount of
bandwidth is consumed on negotiation.

In your example above, the two transmitters would each need to be able
accordingly.

R

#### Rich Grise

Jan 1, 1970
0
nick said:
if i have a transmitter(T) ,receiver(B,C,D) in Room (X)
(T) transmit a signal to (B,C,D) at the same frequency, but at
different channel, so that (T) can control (B,C,D) individually.
Room(Y) is nearby Room(B), i use the same set of above in Room(Y),
then Room(X)and Room(Y) ,use that system at same time , the signal of
(T) in Room(X) will transmit throught the wall and enter Room(Y).so
how to solve this problem?

like the radiotelephones ,in a flat every families can use the same
model radiotelephones , but the phone signals will not against each
others?

Sorry, my english is not good,so if the above explanation is not
clearly, i very welcome you ask me to explain again

to English dictionary, and did very well.

About your concern - it sounds like you have room X with transmitter
T, and receivers B, C, and D. T can control B. In room Y, you have a
transmitter (same set of above, right?) T, and receivers B, C, and D.
You're asking how, when guy X uses T to control B in X, he doesn't
want to control B in Y.

Is this pretty close?

What kind of choices are available for frequencies and channels on
the same frequency?

Would it be feasible to enclose one of the rooms in a Faraday cage?

Thanks,
Rich

N

#### nick

Jan 1, 1970
0
can i use a IC to detect the free channel automatically like the
radiotelephone? any IC or circuit can do that?

thanks

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