pin #25
pin#AcronymFull nameDirectionMean3
2
TxD
Transmit Data-»
Transmits bytes out of PC2
3
RxD
Receive Data«-
Receives bytes into PC7
4
RTS
Request To Send-»
RTS/CTS flow control8
5
CTS
Clear To Send«-
RTS/CTS flow control6
6
DSR
Data Set Ready«-
I'm ready to communicate4
20
DTR
Data Terminal Ready-»
I'm ready to communicate1
8
DCD
Data Carrier Detect«-
Modem connected to another9
22
RI
Ring Indicator«-
Telephone line ringing5
7
SG
Signal Ground
In order for two devices to communicate the transmit signal wire must be connected to the receive wire. A crossover cable accomplishes this. With a straight through cable you would have a transmit signal connected to a transmit signal, which is similar to two people talking at once (and no one listening). In a network scenario a straight through cable would cause constant collisions.
A crossover cable is necessary for two similar devices to talk to each other without the use of an intervening network connectivity device because the transmit and receive signals must be crossed between the two devices. This is what a hub or switch would normally do. If a normal, straight through cable were to be used it would connect the transmit signal to the transmit signal on the other device, which is equivalent to two people talking to each other at the same time with no way to listen to what they are saying. With a crossover cable the transmit signal on one end is connected to the receive signal on the other end so the two devices can talk and listen to each other.
When connecting two computers, use cross-over. Cross-over is required to connect the transmit and receive terminals of the two endpoints. When connecting through a router, switch or hub, use straight-through. The router, switch or hub provides the crossover.
1. This means that transmit and receive pairs are internally swapped to maintain proper signal alignment of the TX and RX wire pairs
In the nervous system, electrical signals travel throughout the brain and into the body via nerves and nerve fibers. Electrical signals are how the brain tells the body what it should do.
In general, no, you would not use a cross-over cable to connect a hub/switch/router to a PC. This is because the device itself has cross-over circuitry built into it, and if you used a cross-over cable you would be reversing that process. The net effect is that the transmit signal would connect to another transmit signal, when it should be connected to a receive signal.
A synaspe.. something like that lol
both, but usually biochemical since the synaptic gap is normally too wide for bioelectrical signals to cross.
Yes, neurotransmitters diffuse across the synaptic cleft to transmit a neural signal; the actual neural impulse(spike) occurs when the neuron fires in response to a sufficiency of signals received.
In a normal patch cable the wires are the same on both ends. In a cross over cable the transmit and receive pairs are reversed so that the wire in position 1 goes to 3, and 2 goes to 6.
Straight lines that never cross are called parallel lines.
They cross nerve signals in the insects.