JPH11134947A - Digital interface cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital interface cable conformed to IEEE 1394 standard and having remarkably improved workability of being connected with a plug by a relatively simple method. SOLUTION: This digital interface cable comprises two pairs of twisted pair wires 11-1, 11-2 for signals equipped with shields, an electric power pair wire 12 equipped with a shield, and two plugs formed in both ends and having a plurality of pins connected with respective core wires of the twisted pair wires 11-1, 11-2 for signals and the electric power pair wire 12. The shields 13-1, 13-2 of respective twisted pair wires for signal and the shield 14 of the electric power pair wire are connected with both ends of the cable and connected with plug jackets of the plugs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a digital interface cable, and more particularly to a digital interface cable conforming to IEEE 1394.

[0002]

2. Description of the Related Art IEEE 1394 is a standard for a high-performance serial bus, and includes a peripheral device bus and a parallel bus.
It specifies a high-speed, low-cost serial bus suitable for backing up a backplane bus.

According to this standard: a) Automatic assignment of node addresses is possible and no address switch is required. b) Support variable speed data transfer based on ISDN compatible bit rate, 24.576 Mbits / s for TTL backplane, 49.152 Mbits / s for BTL backplane, and 98.304 Mbits / s for cable media , 196.608 Mbi
ts / s and 383.216 Mbits / s. c) In the case of cable connection, a maximum of 16 physical connections (cable hops) are possible, each having a maximum cable length of 4.5 m and a total cable length of maximum 72 m, and any two devices can be cable-connected. Since the bus management function can recognize a sufficiently small configuration, the performance can be optimized. d) block or single quadlets
Let) read / write and isochronous (isochronou)
s) The bus transmission capability supporting the mode can also provide a guaranteed bandwidth service with low overhead. e) The physical layer supports both cable media and backplane bus. f) It has an equal access mechanism that guarantees equal access to all nodes. In the backplane environment, a priority mechanism is further added. However, even in this case, at least partial access is guaranteed to the node using the equality protocol. g) ISO / IEC 13213: 1994 (IEEE
Std 1212-1991). And so on.

FIG. 3 is a sectional view of a digital interface cable proposed in IEEE 1394, and FIG.
FIG. 3 and 4, reference numeral 1 denotes an outer jacket, 2 denotes an outer shield, 3 denotes a power line, 4 denotes a signal twisted pair line, and 5 denotes an inner shield (signal pair shield). Here, the jacket 1 is an insulating coating having a thickness of 0.70 to 0.90. The standard cable diameter is φ6.1. The outer shield 2 is a 90 to 95% copper wire braid, wound on a metallized polyester tape wound in a spiral shape and having a metal surface on the braid side (outside).

The power line 3 is 22 AWG (7 × 30) and the insulating layer is composed of two single wires of φ1.20. The signal twisted pair wire 4 is 28 AWG (7 × 36) and the insulating layer is φ1.0,
40 twists per meter. Two sets of signal twisted pair wires 4 are incorporated in the cable. The inner shield is a 60-65% copper wire braid, wound on a metallized polyester tape wound spirally with the metal surface facing the braid (outside).

FIG. 5 shows an assembly diagram of this cable shown in IEEE1394. The maximum length of the unit cable is 4.5 m. A 6-pin plug is connected to both ends of the cable. The signal name is determined for each pin of the plug as shown in the table of FIG. This signal name is the same at both ends of the cable. However, pins 3 and 4 at one end are connected to pins 5 and 6 at the other end. The inner shield 5 is connected at both ends of the cable and connected to VG (pin 2) on the ground side of the power line 3, and is insulated from the outer shield 2.
The outer shield 2 is insulated from the inner shield 5 and other wires, and is connected to the plug metal coating (plug jacket).

As shown in FIGS. 3 to 5, the digital interface cable proposed in IEEE 1394 has a structure in which the inner shield 5 and the outer shield 2 are provided and the space between them is insulated by an insulating material. ing. However, with such a structure, there is a problem that the processability of attaching the plug is poor, and thus the production yield is deteriorated. Further, in a bending test or the like, there was a high possibility that the insulating material would be deformed or deteriorated.

For example, the connection work between the cable and the plug is specifically described as follows: 1) coating removal processing 2) preliminary soldering 3) signal wire soldering 4) internal shield soldering 5) insulating material processing, Fixing 6) Solder outer shield 7) Assembling plug jacket 8) Molding and other operations. These operations are not only labor intensive, but also have difficulties in processing, such as the need to insulate the inner shield and the outer shield three-dimensionally in the plug, which makes the workability and workability extremely poor. Was.

[0009]

As described above, the digital interface cable proposed in the conventional IEEE 1394 has a poor workability of connection with a plug, and in particular, the inner shield and the outer shield must be insulated. In addition, there is a problem that three-dimensional processing is required, and if the processing is not performed well, insulation deterioration is caused.

It is an object of the present invention to improve this point and to realize a digital interface cable conforming to the IEEE 1394 standard, which greatly improves the workability of connection with a plug by a relatively simple method.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method for manufacturing a semiconductor device having a speed of 24.576 Mbits / s.
In a digital interface cable used for a high-speed, low-cost 3.216 Mbits / s serial bus, two sets of digital interface cables are provided at both ends of a shielded signal twisted pair wire and shielded power pair wire, and at both ends of the cable. Comprising two plugs each of which is connected to a respective pin of the signal twisted pair wire and the power pair wire, wherein each shield of the signal twisted pair wire and a shield of the power pair wire are provided. Are connected at both ends of the cable, and are connected to the metal coating (plug jacket) of the plug.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a digital interface cable according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of a digital interface cable according to an embodiment of the present invention, and FIG. 2 is an assembly diagram thereof.

In FIG. 1, 11-1 and 11-2 are signal twisted pair wires, 12 is a power pair wire, 13-1 and 13-2 are signal pair shields, 14 is a power pair shield, and 15 is a jacket. As can be seen from FIG. 1, this cable has two sets of signal twisted pair wires 11-1 and 11
-2 and one pair of power pairs 12.

As shown in FIG. 2, one of the cores of the signal twisted pair wire 11 is connected to the third and fourth pins of the plug 20 at one end and to the fifth and sixth pins of the plug 20 at the other end.
It is connected to the number pin. 3rd pin is signal TPB *, 4
The No. pin corresponds to the signal TPB, the No. 5 pin corresponds to the signal TPA *, and the No. 6 pin corresponds to the signal TPA. TPA *, TPA and T
PB * and TPB are low voltage and low current bidirectional differential pair signals, respectively. TPA is a terminal for a reception data signal and a transmission strobe signal, and TPB is a terminal for a reception strobe signal and a transmission data signal. Signals TPA and TPB can take values of “0”, “1” and “z”, respectively. Here, “z” indicates a non-driven or no connection state.

The core wire of the power pair wire 12 is connected to the first and second pins of the plug 20, with the first pin corresponding to VP (voltage side) and the second pin corresponding to VG (ground side). As shown in FIG. 2, the wiring of these lines to the plug 20 has basically the same connection configuration as the conventional example shown in FIG. Accordingly, the pin numbers and signal arrangements are as shown in FIG.

The connection of this embodiment differs from the conventional example shown in FIGS. 3 to 5 in the processing of the shield. In this embodiment, as can be seen from the assembly diagram of FIG. 2, the signal pair shields 13-1 and 13-2 and the power pair shield 14 are connected at both ends of the cable, respectively.
It is connected to the plug jacket. Therefore, in the present invention, in the process of connecting the cable to the plug 20, the respective cores of the signal twisted pair wires 11-1 and 11-2 and the respective cores of the power pair wire 12 are soldered to the respective pins of the plug 20. After, signal pair shield 1
By soldering 3-1 and 13-2 and the power pair shield 14 to the plug jacket, the solder connection process ends,
In the operation, unlike the conventional example shown in FIGS. 3 to 5, there is no need for trouble such as insulating the inner shield and the outer shield. Accordingly, the workability of the operation of attaching the cable to the plug 20 is greatly improved, whereby the production yield can be improved, and the risk of deformation of the insulating material and insulation deterioration is reduced accordingly. In addition, since the cable is configured by combining each pair of wires, the configuration of the cable is simplified, and the manufacturing process of the cable body is also simplified,
The production efficiency is increased, and it can be produced at a lower price.

A comparison between the assembly diagram of this embodiment in FIG. 2 and the assembly diagram of the conventional example in FIG. 5 shows that the signal pair shield is connected to the VG of the second pin of the plug 20 in FIG. 2, the signal pair shields 13-1 and 13-2 are connected to the plug jacket, but are not directly grounded. However, since the plug jacket is grounded via a capacitor in terms of high frequency, it is equivalent to being directly grounded in terms of high frequency, and there is no problem in this respect.

[0018]

As described above, according to the first aspect of the present invention, from 24.576 Mbits / s to 393.21.
In a digital interface cable used for a high-speed, low-cost serial bus of 6 Mbits / s,
Two sets of shielded signal twisted pair wires, shielded power pair wires, and a plurality of pins provided at both ends of the cable, each having a plurality of pins, and each of the signal twisted pair wires and the power pair wire is connected to each pin. It has two plugs to be connected, and each shield of the signal twisted pair wire and the shield of the power pair wire are connected at both ends of the cable, and are connected to the metal jacket (plug jacket) of the plug. And The invention according to claim 2 of the present invention is characterized in that this cable complies with the standard of the IEEE 1394 digital interface cable. By employing such a configuration, the configuration of the cable is simplified, the manufacturing process of the cable body is simplified, the manufacturing efficiency is increased, and the cable can be manufactured at a lower cost. In addition, since the shields are connected to the same point at both ends of the cable, the work of connecting to the plug is simplified, and the workability can be greatly improved. Therefore,
A digital interface cable conforming to IEEE 1394 can be realized at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a digital interface cable according to an embodiment of the present invention.

FIG. 2 is an assembly view of the embodiment of the digital interface cable shown in FIG. 1;

FIG. 3 is a cross-sectional view of a digital interface cable proposed in IEEE1394.

FIG. 4 is a configuration diagram of a digital interface cable proposed in IEEE1394.

FIG. 5 is an assembling diagram of a digital interface cable proposed in IEEE1394.

FIG. 6 is a table of signal names for each pin of a plug.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Jacket, 2 ... Outer shield, 3 ... Power line, 4 ... Signal twisted pair wire, 5 ... Inner shield, 11-1, 11-2
... Signal twisted pair line, 12 ... Power pair line, 13-1,
13-2: signal pair shield, 14: power pair shield, 15: jacket, 20: plug.

Claims (2)

[Claims] 1. From 24.576 Mbits / s to 39
A digital interface cable used for a high-speed, low-cost serial bus of 3.216 Mbits / s, comprising two sets of twisted pair wires for shielded signals, shielded power pair wires, and a plurality of pins provided at both ends of the cable. And two plugs each of which is connected to a respective pin of the signal twisted pair wire and the power pair wire, and wherein each shield of the signal twisted pair wire and the shield of the power pair wire are a cable. Connected at both ends of the
A digital interface cable connected to a metal jacket (plug jacket) of the plug. 2. The digital interface cable according to claim 1, wherein the digital interface cable conforms to an IEEE 1394 digital interface cable standard.