AU676752B2 - Printed circuit board for connectors - Google Patents
Printed circuit board for connectors Download PDFInfo
- Publication number
- AU676752B2 AU676752B2 AU71674/94A AU7167494A AU676752B2 AU 676752 B2 AU676752 B2 AU 676752B2 AU 71674/94 A AU71674/94 A AU 71674/94A AU 7167494 A AU7167494 A AU 7167494A AU 676752 B2 AU676752 B2 AU 676752B2
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- AU
- Australia
- Prior art keywords
- circuit board
- tracks
- pair
- printed circuit
- pairs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Description
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION NAME OF APPLICANT(S): Krone Aktiengesellschaft ADDRESS FOR SERVICE: 0e.6 .6 .0 C C DAVIES COLLISON CAVE Patent Attorneys I Little Collins Street, Melbourne, 3000.
INVENTION TITLE: Printed circuit board for connectors The following statement is a full description of this invention, including the best method of performing it known to me/us:la- The present invention relates to a printed circuit board for connectors in communications and data systems engineering distribution systems.
The operating frequencies of up to 100 MHz occurring in current distribution systems require careful configuration of all components of the distribution system, especially also of the connectors in the patch fields. Three main demands are made on the transmission performance of the components, namely with respect to the insertion loss, terminal return loss and the cross-talk performance. Apart from cable attenuation the, cross-talk performance in particular is the factor which determines maximum transmission performance. For this reason additional compensation measures, apart from an originally cross-talk-deficient design, are normally necessary in individual i components. The requirements to be fulfilled by the components of commercial 15 distribution systems are set out in the US standard ANSI/EIA/TIA-568 ('Commercial Building Telecommunications Wiring Standard') and the associated 'Supplement Technical Systems Bulletin' TIA/EIA TSB 40. Of special interest is category 5 of this standard, which requires of connectors a cross-talk attenuation (NEXT) of at least -40 dB between the individual board pairs at an operating frequency of 100 MHz. This requirement can barely be fulfilled any longer by standard connectors having even contact clearance and necessitates complicated board geometries or balancing circuits.
The specification of US 5 295 869 discloses a connector in which a capacitive balancing of cross-talk occurs on an additional plate by means of closely adjoining through-hole platings. This same document also itemises the other known possibilities for balancing the cross-talk, namely; use of discrete balancing capacitors, design of capacitive surfaces on associated printed circuit boards, inductive coupling by means of parallel conductivity on associated printed circuit boards, as well as additional balancing conductor sections.
The drawbacks to these known balancing processes for connectors are deicfent compatibility of discrete balancing capacitors or additional balancing conductor sections, 9409p'opcjcmkront4jpcJ i PA.OIUMNIN71674-94,311- 29111/0lA as well as increased manufacturing costs because of additionally required processes.
The specification of DE 43 25 952.9 discloses a contact board for distribution systems which enables cross-talk attenuation of better than -60 dB in a configuration as circuit board or terminal board by contraction of the contact clearance between both conductors of the twisted pairs with constant contact clearance between the different double wies. The disadvantage is that with this particular configuration of the contact board as disconnecting board, the cross-talk attenuation between opposite double wires rises to -40 dB during use of conventional connectors, accordingly requiring further balancing measures on the go• 10 connector.
In accordance with the present invention, there is provided a printed circuit board for 090 use in terminating first and second twisted pair cables to first and second pairs of contacts of a *..:connector, in a symmetrical communications and data system, the circuit board having a first pair 15 of contact surfaces on a front face thereof, for making connection to respective ones of the first pair of contact of the connector and a second pair of contact surfaces on a rear surface thereof for making connection to respective ones of the second pair of contacts of the connector, the front face of the circuit board having a first pair of substantially parallel circuit board tracks arranged substantially congruently with a second pair of circuit board tracks on the rear face of the circuit board, said contact surfaces being disposed at one end of the circuit board, and the first pair of circuit board tracks extending from the first pair of contact surfaces to respective ones of a first pair of contact pads on the front face of the circuit board at the end of the circuit board opposite said one end, and the second pair of circuit board tracks extending from the second pair of contact surfaces to respective ones of a second pair of contact pads on the rear face of the circuit board at said opposite end, said first and second pairs of contact pads being arranged to enable connection thereto of respective conductors of the respective first and second twisted pair cables, wherein one of said tracks of said second pair crosses over the other of the tracks of that pair by means of two through holes in the circuit board, which are electrically interconnected on the front face through an interconnecting circuit board track, so that when conductors of the first and second twisted pair cables are connected to respective pairs of the T. R9q4 PE KAN767-9.31 2/1I 'P\OPIR "RAT1674 -94.3I11 29/11 -2Acontact pads, and the pairs of contact surfaces are connected to the contacts of the respective pairs of contacts of the connector, the circuit board tracks provide a connection from the twisted pair cables to the contacts which is in use effective to reduce cross talk.
In embodiments of the invention, partly magnetic self-balance is achieved between the connector and the contact board, as is minimal cross-talk inside the connector on the basis of the configuration of the circuit board tracks. The magnetic self-balance occurs through circuit board track sections which run essentially parallel and closely adjacent to the contact springs of the contact board and are connected to the contact surfaces, whereas the cross-talk attenuation in the connector is minimised predominantly by the substantially congruent circuit board track design on the front and back of the printed circuit board.
Further advantageous developments of the present invention can be ascertained from the dependent claims appended hereto. In particular, contraction of the parallel circuit board 15 track design leads to adjustment of the resistance impedance to in the 9* S S go* *oo*
I
-3vicinity of 100 ohm, effectively avoiding reflections. Connection of the circuit board tracks with capacitive surfaces brings about an improved resistance impedance. Un addition, these serve to balance the cross-talk between front and back of the printed circuit board and mainly balance out the influences of the contact surfaces. In order to balance undetected cross-talk of the contact board by magnetic ,elf-balance the capacitive surfaces are designed preferably somewhat larger than the associated contact surfaces.
The invention is described in greater detail hereinbelow, by way of example only, with reference to the accompanying drawings, in which: Figure 1 shows a side view of a twisted pair connector block with inserted printed circuit board; Figure 2 shows a sectional view of the connector block with inserted printed circuit 15 board; Figure 3 is a plan view of a front face of the printed circuit board; and Figure 4 is a plan view of a back face of the printed circuit board.
A comlector block 1 for di;tribution systems for use in communications and data systems engineering normally comprises a synthetic housing with matching recesses for terminal contacts 3, 4, as in Figure 1. Each pair of terminal contacts 3, 4 serves to connect a twisted pair 2. In the symmetrically structured connector block 1 a pair of terminal contacts 3, 4 corresponds to an associated pair on the opposite side of the connector block. One side of the connector block 1 constitutes the cable side to which are connected double wire 2 coming from, for example, a telephone exchange, whereas on the opposite jumper side double wires 2 are connected for the callers. A connector can be inserted in a central aperture 14 for shunting of signals between the associated contacts or for measuring and testing purposes. Such a connector comprises a printed circuit board 7 and twisted pairs 8 of an interconnection cable soldered thereto. As shown in Figure 2, contact springs 9 from two opposing terminal contacts 3 extend into the central aperture 14. In this embodiment the contact springs 9 form a break contact, that is, without an inserted connector therebetween the opposing terminal contacts 3 are 0906 p:\opaicmJrvncG04.pc,3 -4electrically interconnected. When printed circuit board 7 of the connector is plugged into the break contact, the connection is interrupted. Twisted pairs 8 of the interconnec'ion cable soldered to printed circuit board 7 are then tapped.
In its lower section, which is plugged into central aperture 14, printed circuit board 7 is designed with a slot 41, as shown in Figures 3 and 4. On each branch, contact surfaces 21, 22, 23, 24 are disposed on the front 20 and back 40 of printed circuit board 7. Attached thereto are associated circuit board tracks 25, 26, 27, 28 which run generally parallel to the longitudinal edge of the circuit board 7. After running approximately one third of the length of printed circuit board 7 circuit board tracks 25, 26, 27, 28 deviate towards the outer edge of printed circuit board 7, at which point circuit board tracks 26 of front 20 run substantially congruently with circuit board tracks 27, 28 of the back.
After this deviation circuit board tracks 25, 26 of front 20 and circuit board tracks 27, 28 of the back again run parallel to each other, though at a smaller distance apart.
15 Positioned near circuit board track 26 is a capacitive surface 32 which is connected to circuit board track 26. Similarly, a capacitive surface 33 is positioned near circuit board track 27 on back 40 of printed circuit board 7, substantially congruently with capacitive surface 32.
By means of two through-hole platings 29, 30, which are electrically interconnected on front 20 through a circuit board track 31, circuit board track 28 on back 40 of printed circuit board 7 crosses circuit board track 27 and is connected to capacitive surface 33. Thereafter, circuit board tracks 27, 28 again continue parallel to each other and are finally connected to associated solder pads 37, 39. Arranged beneath solder pad 36 on back 40 of printed circuit board 7 is another capacitive surface 35 and attached to circuit board track 27. Positioned substantially congruently with capacitive surface on back 40 of printed circuit board is a capacitive surface 34 on front 20 and attached to circuit board track After running approximately two thirds of the length of printed circuit board 7 circuit board tracks 25, 26 deviate to opposite longitudinal edge (42) of printed circuit board 7 and again run parallel to each other to eventually connect with associated solder 94906p:\opcejcm.kwne04jpC,4 pads 36, 38. Soldered to solder pads 36, 38 or 37, 39 are associated twisted pairs 8, on which the tapped signal can be forwarded. Contact surfaces 21, 22, 23, 24 create the electrical contact to contact springs 9 of terminal contacts 3, 4 in central aperture 14.
The parallel configuration of the circuit board tracks above contact surfaces 21, 22, 23, 24 has a partly magnetic self-balancing effect with contact springs 9 of connector block 1. The connecting parallel but closer together configuration of circuit board tracks minimises cross-talk to neighbouring connectors and enables resistance impedance for preventing reflections. The distance between circuit board tracks 25, 26 or 27, 28 in the closer area is designed preferably such that the thus formed double wire exhibits a resistance impedance close to 100 ohm. Because of the substantially congruent configuration of circuit board tracks and capacitive surfaces an exactly defined magnetic and electrical coupling is achieved between front 20 and back 40. And with the crossing of circuit board track 28 on back 40 of printed circuit board 7 after traversing "15 approximately half of the length, where the circuit board tracks closely adjoin, of printed circuit board 7 there is consequently almost complete balancing of the cross-talk between front 20 and back 40. The respective flat designed capacitors 32, 33 or 34, 35 also contribute to balancing the cross-'ilk between front 20 and back 40 and mainly balance the influence of contact surfaces 21, 22 or 23, 24. Capacitive surfaces 32, 33 and 34, are preferably somewhat larger than contact surfaces 21, 22, 23, 24 for the cross-talk of contact board 1 not detected by the magnetic self-balancing to be balanced.
Dividing up of the balancing into an inductive portion (parallel circuit board tracks closely adjoining and crossed over after half the length of the board) and a capacitive portion (capacitive surfaces 32, 33 and 34, 35) in the aforementioned ratio results eventually in good resistance impedance alignment and thus leads to smaller reflections, as would be the case for purely inductive or purely capacitive balancing.
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Claims (9)
1. A printed circuit board for use in terminating first and second twisted pair cables to first and second pairs of contacts of a connector, in a symmetrical communications and data system, the circuit board having a first pair of contact surfaces on a front face thereof, for making connection to respective ones of the first pair of contacts of the connector and a second pair of contact surfaces on a rear surface thereof for making connection to respective ones of the second pair of contacts of the connector, the front face of the circuit board having a first pair of substantially parallel circuit board tracks arranged substantially congruently with a second pair of circuit board tracks on the rear face of the circuit board, said contact surfaces being disposed at one end of the circuit board, and the first pair of circuit board tracks extending from the first pair of contact surfaces to respective ones of a first pair of contact pads on the front face of the circuit board at the end of the circuit board opposite said one end, and the second pair of circuit board tracks extending from the second pair of contact surfaces to respective ones of a second 0 pair of contact pads on the rear face of the circuit board at said opposite end, said first and second pairs of contact pads being arranged to to enable connection thereto of respective conductors of the respective first and second twisted pair cables, wherein one of said tracks of i said second pair crosses over the other of the tracks of that pair by means of two through holes in the circuit board, which are electrically interconnected on the front face through an interconnecting circuit board track, so that when conductors of the first and second twisted pair cables are connected to respective pairs of the contact pads, and the pairs of contact surfaces are connected to the contacts of the respective pairs of contacts of the connector, the circuit board tracks provide a connection from the twisted pair cables to the contacts which is in use effective to reduce cross talk.
2. A prin.,-) circuit board as claimed in Claim 1, wherein the contact surfaces of the circuit board tracks are provided on an end of the circuit board and are separated by a slot.
3. A printed circuit board as claimed in Claim 1, wherein the circuit board tracks, starting j, -from the respective contact surfaces, after running approximately one third of the length of the S z printed circuit board, deviate sidewardly and then continue parallel to each other, but more n-o 9S ^-0 ';\OPMU'RCAT71674-94.354 19/1I26 -7- closely adjoining.
4. A printed circuit board as claimed in any one of Claims 1 to 3, including respective capacitive surfaces connected to the circuit board tracks.
A printed circuit board as claimed in Claim 4, wherein the capacitive surfaces are designed somewhat larger than the associated contact surfaces.
6. A printed circuit board as claimed in Claim 4 or 5, wherein the capaci,l e surfaces for first ones of the respective tracks of the pairs of circuit board tracks are arranged approximately in the centre of the printed circuit board and the capacitive surfaces for second ones of the respective tracks of the pairs of circuit board tracks are arranged adjacent solder pads provided on the opposite end of the circuit board from the contact surfaces,
7. A printed circuit board as claimed in Claim 5, wherein the circuit board tracks, starting from the contact surfaces and after running approximately one third of the length of the printed circuit board deviate towards a longitudinal edge, in order to then again run parallel to the longitudinal edge, through more closely adjoining, whereby the circuit board tracks of the front face, after running approximately two thirds of the length of the printed circuit board, deviate towards a first angle of deviation, then run normally to the longitudinal edge, deviate again to the contact pads to become connected with first one of the solder pads, and one circuit board track on the rear face, after running approximately half the length of the printed circuit board, deviates towards the first angle of deviation and then crosses the other circuit board track on the rear face by means of through-hole platings, in order to continue with the circuit board 25 tracks on the rear face parallel to the longitudinal edge and finally to be connected with second S. ones of the solder pads.
8. In combination, an electrical connector with first and second pairs of spring contacts arranged at opposed sides of aperture, and a printed circuit board as claimed in any one of P:\OP'L\KAT171674-94.3'4 -23/1296 -8- claims 1 to 7, the printed circuit board having said one end thereof inserted into said aperture so as to be interposed between the first and second pairs of spring contacts such that the first and second pairs of spring contacts bear against and make electrical contact to the first and second pairs of contact surfaces of the printed circuit board, and the printed circuit board extending away from said electrical connector to said opposite end of the printed circuit board, and first and second twisted pair cables being electrically connected to the first and second pairs of contact pads.
9. A printed circuit board substantially as hereinbefore described with reference to the drawings. DATED this 19th day of December, 1996 KRONE AKTIENGSELLSCHAFT By its Patent Attorneys Davies Collison Cave S I~ I ABSTRACT Printed circuit boards for connectors in symmetrical communications and data systems engineering distribution systems, comprising a pair of substantially parallel circuit board tracks on a front face thereof arranged substantially congruently with a pair of substantially parallel circuit board tracks of a back face of the printed circuit board, and wherein one of said pair of tracks on the back face crosses over the other track of the pair by means of two through-hole platings, which are electrically interconnected on the front face through an interconnecting circuit board track. *o I
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU71674/94A AU676752B2 (en) | 1994-09-06 | 1994-09-06 | Printed circuit board for connectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU71674/94A AU676752B2 (en) | 1994-09-06 | 1994-09-06 | Printed circuit board for connectors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU7167494A AU7167494A (en) | 1996-03-21 |
| AU676752B2 true AU676752B2 (en) | 1997-03-20 |
Family
ID=3754508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU71674/94A Ceased AU676752B2 (en) | 1994-09-06 | 1994-09-06 | Printed circuit board for connectors |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU676752B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2268336A (en) * | 1992-06-25 | 1994-01-05 | Northern Telecom Ltd | Reduction of parasitic reactive coupling in printed circuit board assemblies |
| GB2269941A (en) * | 1992-08-20 | 1994-02-23 | Hubbell Inc | Connector for communications systems with cancelled crosstalk |
| US5295869A (en) * | 1992-12-18 | 1994-03-22 | The Siemon Company | Electrically balanced connector assembly |
-
1994
- 1994-09-06 AU AU71674/94A patent/AU676752B2/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2268336A (en) * | 1992-06-25 | 1994-01-05 | Northern Telecom Ltd | Reduction of parasitic reactive coupling in printed circuit board assemblies |
| GB2269941A (en) * | 1992-08-20 | 1994-02-23 | Hubbell Inc | Connector for communications systems with cancelled crosstalk |
| US5295869A (en) * | 1992-12-18 | 1994-03-22 | The Siemon Company | Electrically balanced connector assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| AU7167494A (en) | 1996-03-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| HB | Alteration of name in register |
Owner name: KRONE GMBH Free format text: FORMER NAME WAS: KRONE AKTIENGESELLSCHAFT |
|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |