Telecommunications jack with adjustable crosstalk compensation
Methods and systems for compensating for crosstalk in a telecommunications jack are disclosed. One method includes manufacturing a circuit board having a zone of crosstalk compensation between a first wire pair and a second wire pair, the zone of crosstalk compensation including a capacitive coupling connected between the first wire pair and the second wire pair and a second capacitive coupling selectively connectable in parallel with the capacitive coupling. The method further includes determining a crosstalk value generated by the jack including the manufactured circuit board. The method also includes, upon determining that the crosstalk value is outside of a crosstalk pass band, adjusting the zone of crosstalk compensation by altering an electrical connection between the second capacitive coupling and the capacitive coupling after the circuit board has been manufactured.
1. A method for compensating for crosstalk generated by one or more of a plurality of wire pairs in a telecommunications jack, the method comprising:
manufacturing a circuit board having a zone of crosstalk compensation between a first wire pair and a second wire pair, the zone of crosstalk compensation including a capacitive coupling connected between the first wire pair and the second wire pair and a second capacitive coupling selectively connectable in parallel with the capacitive coupling;
determining a crosstalk value generated by the jack including the manufactured circuit board;
upon determining that the crosstalk value is outside of a crosstalk pass band, adjusting the zone of crosstalk compensation by altering an electrical connection between the second capacitive coupling and the capacitive coupling after the circuit board has been manufactured, thereby either adding or removing the second capacitive coupling to the zone of crosstalk compensation.
2. The method of claim 1 , wherein altering the electrical connection includes forming an electrical connection between a via electrically connected to the capacitive coupling and a via electrically connected to the second capacitive coupling.
3. The method of claim 1 , wherein altering the electrical connection includes disconnecting the electrical connection by electrically disconnecting a via electrically connected to the capacitive coupling from a via electrically connected to the second capacitive coupling.
4. The method of claim 3 , wherein the crosstalk pass band is about 1 dB.
5. The method of claim 1 , wherein determining the crosstalk value includes testing the jack to determine whether the crosstalk generated by the jack falls within the crosstalk pass band.
6. The method of claim 1 , further comprising, after adjusting the zone of crosstalk compensation, redetermining a crosstalk value generated by the jack.
7. A crosstalk compensation arrangement for a telecommunications jack comprising:
a circuit board;
a plurality of contact springs mounted on the circuit board;
a plurality of wire termination contacts mounted on the circuit board;
a plurality of tracks on the circuit board that respectively electrically connect the contact springs to the wire termination contacts; and
a crosstalk compensation arrangement including a zone of crosstalk compensation between a first wire pair and a second wire pair, the zone of crosstalk compensation including a capacitive coupling connected between the first wire pair and the second wire pair and a second capacitive coupling selectively connectable in parallel with the capacitive coupling by altering a connection between a via electrically connected to the capacitive coupling and a via electrically connected to the second capacitive coupling after the circuit board is manufactured, thereby either adding or removing the second capacitive coupling to the zone of crosstalk compensation.
8. The crosstalk compensation arrangement of claim 7 , wherein the crosstalk compensation arrangement further includes a third capacitive coupling connected between the first wire pair and the second wire pair and a fourth capacitive coupling selectively connectable in parallel with the third capacitive coupling by altering a connection between a via electrically connected to the third capacitive coupling and a via electrically connected to the fourth capacitive coupling.
9. The crosstalk compensation arrangement of claim 8 , further comprising a sixth capacitive coupling selectively connectable in parallel with the third capacitive coupling and the fourth capacitive coupling.
10. The crosstalk compensation arrangement of claim 7 , wherein the contact springs include first, second, third, fourth, fifth, sixth, seventh and eighth consecutively arranged contact springs.
11. The crosstalk compensation arrangement of claim 10 , wherein the wire termination contacts include first, second, third, fourth, fifth, sixth, seventh and eighth wire termination contacts for terminating wires to the jack.
12. The crosstalk compensation arrangement of claim 11 , wherein the plurality of tracks includes first, second, third, fourth, fifth, sixth, seventh and eighth tracks that respectively electrically connect the first, second, third, fourth, fifth, sixth, seventh and eighth contact springs to the first, second, third, fourth, fifth, sixth, seventh and eighth wire termination contacts.
13. The crosstalk compensation arrangement of claim 12 , wherein the capacitive coupling and the second capacitive coupling are connected between the third and fourth tracks.
14. The crosstalk compensation arrangement of claim 13 , wherein the capacitive coupling and the second capacitive coupling are connected between the fifth and sixth tracks.
15. The crosstalk compensation arrangement of claim 7 , wherein the capacitive coupling and the second capacitive coupling comprise a plurality of interdigitated fingers.
16. The crosstalk compensation arrangement of claim 7 , further comprising a fifth capacitive coupling selectively connectable in parallel with the capacitive coupling and the second capacitive coupling.
17. The crosstalk compensation arrangement of claim 7 , wherein an acceptable level of crosstalk generated by a telecommunications jack including the circuit board is about 25 dB to about 26 dB.
18. The crosstalk compensation arrangement of claim 17 , wherein the second capacitive coupling provides alteration of the crosstalk by about 0.8 dB.
19. A telecommunications jack for use in a twisted pair system, the jack comprising:
a housing defining a port for receiving a plug;
a plurality of contact springs adapted to make electrical contact with the plug when the plug is inserted into the port of the housing;
a plurality of wire termination contacts for terminating wires to the jack;
a circuit board including conductive tracks that electrically connect the contact springs to the wire termination contacts; and
a crosstalk compensation arrangement including a zone of crosstalk compensation between a first wire pair and a second wire pair, the zone of crosstalk compensation including a capacitive coupling connected between the first wire pair and the second wire pair and a second capacitive coupling selectively connectable in parallel with the capacitive coupling by altering a connection between a via electrically connected to the capacitive coupling and a via electrically connected to the second capacitive coupling after the circuit board is manufactured, thereby either adding or removing the second capacitive coupling to the zone of crosstalk compensation.
20. The telecommunications jack of claim 19 , wherein the zone of crosstalk compensation corresponds to a second zone of crosstalk compensation between the first wire pair and the second wire pair.