JP2592013Y2 - Voice / data composite multi-pair cable - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention mainly relates to a LAN (Local Area Network) in an intelligent building.
rk), which is used for wiring to integrate data transmission and telephone-based voice transmission, etc., by reducing the installation space by reducing the diameter and by adopting the single-layer installation method instead of the conventional multiple-layer installation method. The present invention relates to a combined voice / data multi-pair cable that reduces the installation cost.

[0002]

2. Description of the Related Art Conventionally, a cable used for data transmission (for data) such as a LAN and a cable used for telephone (for voice) have an adverse effect due to mutual interference (particularly, from voice to data). Since transmission errors must be caused by crosstalk, the cables must be laid on separate cables, so that multiple cables must be laid (Fig. 2).
(See (a) and (b).) In addition, as the information society such as personal computers, telephones, security systems, etc., has rapidly increased in the current information society, the number of cables to be laid has also increased, so that the laying space and the laying cost have been increasingly reduced. Is being requested. In addition, in the case of existing buildings, most of them have only power and telephone pipes, and such telephone cables 7 'and data cables are used for telephone laying pipes.
There was also a technical problem that all 8's had to be stored.

[0003]

The present invention has been intensively studied to solve these technical problems, and as a result, the space saving of laying by reducing the diameter and the conventional multi-laying method have been replaced by a single-laying method. The purpose of the present invention is to provide a voice / data composite multi-pair cable 1 in which installation cost is reduced, and the main point is that a plurality of twisted pairs 3 of insulated core wires are assembled. The problem is the mutual interference (particularly the occurrence of transmission errors due to crosstalk from voice to data) between the paired voice pair unit 2 and the paired twisted pair wires 3 and the paired data pair unit 5. Voice pair unit 2 and data pair unit
Divided 5 unit type or stratification types is voice data complex many-cables 1, characterized in that the shielding by the shielding layer 4 on one or both or either.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a multi-pair audio / data cable 1 according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 (a) shows a voice / data composite multi-pair cable 1 of the present invention.
In the first embodiment, a sectional view of a unit type is shown. As is apparent from the figure, the multi-pair audio / data cable 1 of the present invention has a data pair obtained by assembling a plurality of twisted pairs 3 of insulated core wires in which a central conductor is covered with an insulator such as polyethylene. A unit 5 and a plurality of the twisted pair wires 3 are assembled and twisted, and a PV layer is placed on the audio pair unit 2 on which a shield layer 4 made of a thin metal wire braid or a metal tape is applied.
A unit type voice / data composite multi-pair cable 1 provided with a sheath 6 such as C. Fig. 1 (b)
FIG. 3 is a sectional view of a layered type of a second embodiment of the combined voice / data multi-pair cable 1 according to the present invention. As is apparent from the figure, a shield layer 4 made of a thin metal wire braid or a metal tape is applied on the audio pair unit 2 in which a plurality of the twisted pair wires 3 are assembled and twisted, and the twisted pair wire 3 is further placed thereon. , A data pair unit 5 in which a plurality of are combined and twisted is provided, and a sheath 6 is provided thereon.
This is a data composite multi-pair cable 1 .

Next, a specific description will be given of a unit type, which is a first embodiment of the combined audio / data multi-pair cable 1 of the present invention, as an example. The cable structure is as shown in Table 1.

[0006]

[Table 1]

[0007] Voice / data composite multi-pair cable 1 of the present invention
Are shown in Table 2.

[0008]

[Table 2]

At that time, an automatic crosstalk measuring instrument was measured for a frequency of 4 MHz or less and a network analyzer was measured for a frequency of 20 MHz or less by a comparative method. As is evident from Table 2, the minimum value was 87, which was a level without any problem as the level of interference, and extremely good results were obtained. In addition, as other evaluation test items, the capacitance, the characteristic impedance Z ₀ , and the attenuation α were also measured, but no problem was found, and good results were shown.

Although a typical cable structure has been described so far, a number of cores, a double shield structure, a change in material, or a structure in which the voice pair unit 2 and the data pair unit 5 are interchanged may be employed. It goes without saying that various modifications are included within the scope of the present invention.

[0011]

[Effect of the Invention] As described above, according to the voice / data multi-pair cable 1 of the present invention, the space saving of the installation by reducing the diameter and the conventional multiple installation system are adopted and the single installation system is adopted. This has an excellent effect of reducing the laying cost, so that its industrial value is very large.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a unit type of a first embodiment of a combined audio / data multi-pair cable 1 according to the present invention.
(B) is a sectional view of a layered type of the second embodiment of the combined voice / data multi-pair cable 1 of the present invention.

FIG. 2 (a) is a cross-sectional view of a conventional separately laid audio cable 7 '. (B) is a cross-sectional view of a conventional separately laid data cable 8 '.

[Description of Signs] 1 voice / data composite multi-pair cable 2 voice pair unit 3 twisted wire 4 shield layer 5 data pair unit 6 sheath 7 ′ audio cable 8 ′ data cable 9 ′ twisted wire 10 ′ sheath

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Fumiaki Tsuchiya Examiner, Sanki Kogyo Co., Ltd., 1-4-1, Yurakucho, Chiyoda-ku, Tokyo (56) References JP-A-56-149716 (JP, A) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H01B 11/00-11/20

Claims (1)

(57) [Scope of request for utility model registration] 1. An audio pair unit 2 in which a plurality of twisted pair wires 3 of an insulated core wire in which a central conductor is covered with an insulator are gathered and twisted, and data in which a plurality of the twisted pair wires 3 are gathered and twisted. A combined voice / data multi-pair cable characterized in that the pair unit 5 is divided into a unit type or a stratified type, and both or one of them is shielded by the shield layer 4.