If there is an exact match between the color coding sequence on the back of the jack to the contact sequence on the front, then all of the pairs are backwards, except the orange pair in the first sequence and the green pair in the second sequence.

However, you can't tell if they are in fact correct or not unless you use an ohmmeter to check the back of the jack with the front, or the jack also shows the contact sequence on the back of the jack.

In any event, getting a pair of wires backwards at both ends would still not change the electrical connection characteristics--the electrons couldn't care less.

They do care if two pins that are supposed be connected by a single pair (note pins 3 and 6) are connected by two wires each from separate pairs. Now, I guess, you are really confused.So, I suggest that you just blindly match the wires to the color code of your choosing on the back of the jack and use the same code for both ends or the cable.

Answered by Raksha , an ibibo Master, at 9:11 AM on June 27, 2008

there is an exact match between the color coding sequence on the back of the jack to the contact sequence on the front, then all of the pairs are backwards, except the orange pair in the first sequence and the green pair in the second sequence.

However, you can't tell if they are in fact correct or not unless you use an ohmmeter to check the back of the jack with the front, or the jack also shows the contact sequence on the back of the jack.

In any event, getting a pair of wires backwards at both ends would still not change the electrical connection characteristics--the electrons couldn't care less.

They do care if two pins that are supposed be connected by a single pair (note pins 3 and 6) are connected by two wires each from separate pairs. Now, I guess, you are really confused.So, I suggest that you just blindly match the wires to the color code of your choosing on the back of the jack and use the same code for both ends or the cable.

Answered by Sharad Singh , an ibibo Master, at 6:46 PM on June 05, 2008

RJ-45 or Welcome to a Can of Worms. RJ-45s are the most common jacks installed in new homes…especially in new homes built with structured wiring. Moreover, Ethernet LANS all interface through RJ-45s. That may be why everyone thinks they know what an RJ-45 is. The result is that too often the customer orders one thing and the installer puts in another.

If there is an exact match between the color coding sequence on the back of the jack to the contact sequence on the front, then all of the pairs are backwards, except the orange pair in the first sequence and the green pair in the second sequence. However, you can't tell if they are in fact correct or not unless you use an ohmmeter to check the back of the jack with the front, or the jack also shows the contact sequence on the back of the jack. I would assume that what comes out at the front will be correct if you match the color of the wires to the color code on the back of the jack. That is, I would not connect the white-blue wire to the jack contact labeled blue. Many jacks have an extra twist, etc

Answered by Om Prakash , an ibibo Master, at 6:30 PM on June 05, 2008

Hi radhe,

If there is an exact match between the color coding sequence on the back of the jack to the contact sequence on the front, then all of the pairs are backwards, except the orange pair in the first sequence and the green pair in the second sequence.

However, you can't tell if they are in fact correct or not unless you use an ohmmeter to check the back of the jack with the front, or the jack also shows the contact sequence on the back of the jack.

In any event, getting a pair of wires backwards at both ends would still not change the electrical connection characteristics--the electrons couldn't care less.

They do care if two pins that are supposed be connected by a single pair (note pins 3 and 6) are connected by two wires each from separate pairs. Now, I guess, you are really confused.So, I suggest that you just blindly match the wires to the color code of your choosing on the back of the jack and use the same code for both ends or the cable.

Answered by manu pal , an ibibo Citizen, at 3:42 PM on June 04, 2008

Hi,

If there is an exact match between the color coding sequence on the back of the jack to the contact sequence on the front, then all of the pairs are backwards, except the orange pair in the first sequence and the green pair in the second sequence.

However, you can't tell if they are in fact correct or not unless you use an ohmmeter to check the back of the jack with the front, or the jack also shows the contact sequence on the back of the jack.

In any event, getting a pair of wires backwards at both ends would still not change the electrical connection characteristics--the electrons couldn't care less.

They do care if two pins that are supposed be connected by a single pair (note pins 3 and 6) are connected by two wires each from separate pairs. Now, I guess, you are really confused.

So, I suggest that you just blindly match the wires to the color code of your choosing on the back of the jack and use the same code for both ends or the cable.

Answered by Ajay Pal , an ibibo Master, at 3:05 PM on June 02, 2008

well Radhe, RJ-45 or Welcome to a Can of Worms. RJ-45s are the most common jacks installed in new homes…especially in new homes built with structured wiring. Moreover, Ethernet LANS all interface through RJ-45s. That may be why everyone thinks they know what an RJ-45 is. The result is that too often the customer orders one thing and the installer puts in another.
Progressing from RJ-11 to RJ-14 to RJ-25 was nice and orderly. There was physical compatibility in that plugging an RJ-11 into an RJ-14 or an RJ-14 into an RJ-25 had ensured that you would connect to complete pairs. As shown earlier, pair one (line one) always appears on the centermost set of pins). The next two out are the second pair, and so on. However, the actual cables are not physically that simple. In the diagrams, the orange pair of wires are not adjacent. The blue pair is upside-down. The right ends match RJ-45 jacks and the left ends do not. If, for example, we invert the left side of the 568A "straight"-thru cable to match a 568A jack--put one 180° twist in the entire cable from end-to-end--and twist together and rearrange the appropriate pairs.

for details,please visit:
http://www.duxcw.com/d igest/Howto/network/cable/cabl e5.htm
http://www.duxcw.com/f aq/network/jackcode.htm

Answered by satyaiitk , an ibibo Master, at 11:46 AM on June 02, 2008

well, If there is an exact match between the color coding sequence on the back of the jack to the contact sequence on the front, then all of the pairs are backwards, except the orange pair in the first sequence and the green pair in the second sequence. However, you can't tell if they are in fact correct or not unless you use an ohmmeter to check the back of the jack with the front, or the jack also shows the contact sequence on the back of the jack. I would assume that what comes out at the front will be correct if you match the color of the wires to the color code on the back of the jack. That is, I would not connect the white-blue wire to the jack contact labeled blue. Many jacks have an extra twist, etc. in some of or all of the pairs inside of the jack.

In any event, getting a pair of wires backwards at both ends would still not change the electrical connection characteristics--the electrons couldn't care less. They do care if two pins that are supposed be connected by a single pair (note pins 3 and 6) are connected by two wires each from separate pairs. Now, I guess, you are really confused. So, I suggest that you just blindly match the wires to the color code of your choosing on the back of the jack and use the same code for both ends or the cable.

For more information , please do visit source site:
http://www.duxcw.com/fa q/ netwo rk/jackcode.htm

Answered by Saurabh , an ibibo Master, at 9:06 AM on June 02, 2008

If there is an exact match between the color coding sequence on the back of the jack to the contact sequence on the front, then all of the pairs are backwards, except the orange pair in the first sequence and the green pair in the second sequence. However, you can't tell if they are in fact correct or not unless you use an ohmmeter to check the back of the jack with the front, or the jack also shows the contact sequence on the back of the jack. I would assume that what comes out at the front will be correct if you match the color of the wires to the color code on the back of the jack. That is, I would not connect the white-blue wire to the jack contact labeled blue. Many jacks have an extra twist, etc. in some of or all of the pairs inside of the jack.

In any event, getting a pair of wires backwards at both ends would still not change the electrical connection characteristics--the electrons couldn't care less. They do care if two pins that are supposed be connected by a single pair (note pins 3 and 6) are connected by two wires each from separate pairs. Now, I guess, you are really confused. So, I suggest that you just blindly match the wires to the color code of your choosing on the back of the jack and use the same code for both ends or the cable.

Answered by Nagendra , an ibibo Master, at 7:37 AM on June 02, 2008

RJ-45 or Welcome to a Can of Worms. RJ-45s are the most common jacks installed in new homes…especially in new homes built with structured wiring. Moreover, Ethernet LANS all interface through RJ-45s. That may be why everyone thinks they know what an RJ-45 is. The result is that too often the customer orders one thing and the installer puts in another.
Progressing from RJ-11 to RJ-14 to RJ-25 was nice and orderly. There was physical compatibility in that plugging an RJ-11 into an RJ-14 or an RJ-14 into an RJ-25 had ensured that you would connect to complete pairs. As shown earlier, pair one (line one) always appears on the centermost set of pins). The next two out are the second pair, and so on.
If there is an exact match between the color coding sequence on the back of the jack to the contact sequence on the front, then all of the pairs are backwards, except the orange pair in the first sequence and the green pair in the second sequence. However, you can't tell if they are in fact correct or not unless you use an ohmmeter to check the back of the jack with the front, or the jack also shows the contact sequence on the back of the jack. I would assume that what comes out at the front will be correct if you match the color of the wires to the color code on the back of the jack. That is, I would not connect the white-blue wire to the jack contact labeled blue. Many jacks have an extra twist, etc. in some of or all of the pairs inside of the jack.
In any event, getting a pair of wires backwards at both ends would still not change the electrical connection characteristics--the electrons couldn't care less. They do care if two pins that are supposed be connected by a single pair (note pins 3 and 6) are connected by two wires each from separate pairs. Now, I guess, you are really confused. So, I suggest that you just blindly match the wires to the color code of your choosing on the back of the jack and use the same code for both ends or the cable

Answered by Ram Singh , an ibibo Master, at 7:04 AM on June 02, 2008

RJ-45 or Welcome to a Can of Worms. RJ-45s are the most common jacks installed in new homes…especially in new homes built with structured wiring. Moreover, Ethernet LANS all interface through RJ-45s. That may be why everyone thinks they know what an RJ-45 is. The result is that too often the customer orders one thing and the installer puts in another.
Progressing from RJ-11 to RJ-14 to RJ-25 was nice and orderly. There was physical compatibility in that plugging an RJ-11 into an RJ-14 or an RJ-14 into an RJ-25 had ensured that you would connect to complete pairs. As shown earlier, pair one (line one) always appears on the centermost set of pins). The next two out are the second pair, and so on.
If there is an exact match between the color coding sequence on the back of the jack to the contact sequence on the front, then all of the pairs are backwards, except the orange pair in the first sequence and the green pair in the second sequence. However, you can't tell if they are in fact correct or not unless you use an ohmmeter to check the back of the jack with the front, or the jack also shows the contact sequence on the back of the jack. I would assume that what comes out at the front will be correct if you match the color of the wires to the color code on the back of the jack. That is, I would not connect the white-blue wire to the jack contact labeled blue. Many jacks have an extra twist, etc. in some of or all of the pairs inside of the jack.
In any event, getting a pair of wires backwards at both ends would still not change the electrical connection characteristics--the electrons couldn't care less. They do care if two pins that are supposed be connected by a single pair (note pins 3 and 6) are connected by two wires each from separate pairs. Now, I guess, you are really confused. So, I suggest that you just blindly match the wires to the color code of your choosing on the back of the jack and use the same code for both ends or the cable

Answered by Anju Singh , an ibibo Master, at 6:17 AM on June 02, 2008