JP2012203987A - Balanced cable for lan extending maximum link length in lan wiring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cable which allows for data transmission over a length exceeding a specified length (total cable length of 100 m).SOLUTION: The balanced cable for LAN having the performance of enhanced category 5 standard, even for the cable length exceeding 100 m, includes four twisted pair cables formed by twisting single wire conductors coated with cross-linked polyethylene foam resin having the vesicularity of 50-60% and crosslinking degree of 65% or higher, at a twist pitch of 14.0-20.0 mm, while separating each twisted pair cable not to contact by longitudinal separator and covering all twisted pair cables collectively with a sheath.

Description

  The present invention relates to a balanced cable for LAN that enables data transmission with a link length exceeding the maximum link length (100 m) in a LAN wiring system.

  When constructing a network such as a LAN, devices are connected with a LAN balanced cable. Currently, there are various types of LAN balanced cables in categories (hereinafter referred to as CAT) 3 to CAT 7. The mainstream of balanced cables for LAN used for high-speed LAN is CAT5E (enhanced category 5).

  However, when the CAT5E, CAT6, CAT6A, and CAT7 LAN cables used in the high-speed LAN as described above are wired exceeding 100 m in total length, the amount of attenuation (loss of signal generated between the transmitting end and the receiving end) is reduced. And near-end crosstalk attenuation (noise leaking from one pair to the other end) and equal level, in addition to the effects of increase in propagation time and propagation delay time (time until the transmitted signal reaches the receiving end) Since the far-end crosstalk attenuation (noise leaking from one pair to the receiving end of another pair) tends to increase, when these LAN balanced cables are used, the single-conductor cable 90m and the stranded conductor cable 5m2 each It is stipulated that wiring must be done within a total length of 100 m.

  In addition, due to the wiring length limitation as described above, an optical fiber cable is used for wiring exceeding 100 m. However, there is a problem that the price is higher than that of a balanced cable for LAN.

  In addition, it is conceivable to extend the LAN balanced cable via a bridge or repeater. However, in these cases, power supply to the bridge or repeater is necessary, and there is a problem that the wiring is restricted.

JP 2001-23454 A

  Therefore, the present invention provides a balanced cable for LAN having a CAT5E performance without using a network device such as a bridge or a repeater even if the total wiring cable length is 100 m or more.

  In order to solve the above problems, the present invention is a LAN balanced cable having enhanced category 5 performance even if the total cable length is 100 m or more, and the foaming degree is 45 to 60%. Twisting single wire conductors coated with cross-linked foamed polyethylene resin with a degree of cross-linking of 65% or more to twist a pair of twisted pairs with a twist pitch of 14.0 to 20.0 mm. The balanced cable for LAN is characterized in that four wires are separately provided and all the twisted wires are collectively covered with a sheath.

  In addition, even if the cable length is 100 m or more, it is a balanced cable for LAN having enhanced category 5 standard performance, which is a crosslinked foamed polyethylene resin having a foaming degree of 50 to 60% and a crosslinking degree of 65% or more. The twisted single wire conductors are twisted together to form a pair of twisted wires with a twist pitch of 14.0 to 40.0 mm. The balanced cable configuration for LAN is characterized by being separated in a non-contact manner.

  Since the present invention is configured as described above, even if the total cable length exceeds 100 m, a network can be constructed with peace of mind without impairing the performance of the mainstream CAT5E.

  In addition, since a LAN balanced cable that is less expensive than an optical fiber cable is used, cable wiring costs can be reduced.

It is sectional drawing of the balanced cable for LAN which is this invention. It is a structure table | surface of the balanced cable for LAN which is this invention. It is the table | surface which showed the electrical property of the balanced cable for LANs which is this invention. It is sectional drawing of the 2nd Example of the balanced cable for LANs which is this invention. It is a structure table | surface of the 2nd Example of the balanced cable for LANs which is this invention. It is the table | surface which showed the electrical property of 2nd Example of the balanced cable for LANs which is this invention. It is a graph which shows the measurement result of the balanced cable for LANs which is this invention. It is a figure showing the result of having measured the relationship between the twist pitch of the twisted pair wire in the balanced cable for LAN which is this invention, and near end crosstalk attenuation. It is a figure showing the result of having measured the relation between the twist pitch of a twisted pair wire, and near end crosstalk attenuation in the 2nd example of the balanced cable for LANs which is the present invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Since the propagation delay time in the CAT5E standard increases in proportion to the cable length, it is necessary to reduce the propagation delay time. Generally, since the propagation speed is increased by reducing the dielectric constant of the insulator, the propagation delay time can be reduced by foaming the coated polyethylene and increasing the degree of foaming (← degree of foaming relative to volume). . Further, since the effective propagation distance is shortened by increasing the twist pitch, the propagation delay time can be reduced. However, if the degree of foaming is increased too much, the coating will be crushed and the CAT5E characteristics including the propagation delay time will be deteriorated. Optimization is required.

  1 is a cross-sectional view of a LAN balanced cable according to the present invention, FIG. 2 is a structural table of the LAN balanced cable, and FIG. 3 is a table showing electrical characteristics of the LAN balanced cable.

  As shown in FIG. 1, a balanced cable for LAN 1 according to the present invention is a balanced cable for LAN having enhanced category 5 standard performance even when the cable length is 100 m or more, and has a foaming degree of 50-60. The twisted 2b single wire conductor 2a covered with a crosslinked foamed polyethylene resin having a degree of crosslinking of 65% or more is twisted together, and a pair of twisted wires 2, 2, 2, 2, each pair of twisted wires 2, 2, 2, 2 is separated in a non-contact manner by a cross interposition 3 and is provided with four wires, and all pairs of twisted wires 2, 2, 2, 2 are collectively covered with a sheath 4. And

  As described above, in order to separate the paired twisted wires 2, 2, 2, 2 in a non-contact manner, the inside of the sheath 4 is divided into four equal parts with a cross interposed 3 in the center, 2 was placed.

The single wire conductor 2a constituting each of the paired twisted wires 2, 2, 2, 2 is covered with a crosslinked foamed polyethylene resin. The crosslinked foamed PE is an insulator having a foaming degree of 50 to 60% and a crosslinking degree of 65% or more, and preventing collapse by crosslinking.

  As shown in FIG. 2, the LAN balanced cable 1 is provided with the four twisted wires 2 and separated in a non-contact manner by a cross 3 and the diameter of the single conductor 2a is 0.65 mm, and the cross-linked foam The diameter after coating 2b with polyethylene resin is 1.2 mm, the twist pitch of each pair of twisted wires 2, 2, 2, 2 is 14.0 to 20.0 mm, and the outer diameter of each pair of twisted wires is 2. When the outer diameter when the twisted pair wire is arranged in each space of the cross is 5.8 mm, and the diameter of the LAN balanced cable 1 after being collectively covered with the sheath 4 is 6.7 mm, The result shown in FIG. 3 was obtained.

  The result of FIG. 3 is a measured value at a cable length of 120 m, and a good result is obtained with respect to the TIA / EIA CAT5E standard value (cable length of 100 m). The propagation delay time is 560 ns at 1 MHz and 529 ns at 100 MHz, which is a result of the standard value or less. Further, in all other CAT5E characteristics, the cable length of 120 m satisfies the standard value.

  4 is a cross-sectional view of a second embodiment of a balanced cable for LAN according to the present invention, FIG. 5 is a structural table of the second embodiment of a balanced cable for LAN, and FIG. 6 is an electrical diagram of the second embodiment of the balanced cable for LAN. It is the table | surface which showed the characteristic.

  As shown in FIG. 4, the balanced cable for LAN 1a according to the present invention is a LAN cable having enhanced category 5 standard performance even when the cable length is 100 m or more, and has a foaming degree of 50 to 60%. There are two pairs of twisted wires 2, 2, 2, 2 having a twist pitch of 14.0 to 40.0 mm by twisting a single wire conductor 2 a covered with a crosslinked foamed polyethylene resin having a crosslinking degree of 65% or more. Each pair of twisted wires 2, 2, 2, 2 is separated in a non-contact manner by a shield 2c covered with a plastic tape and further covered with an aluminum foil-attached plastic tape. .. A LAN balanced cable that is covered with a sheath 4 at once.

  As described above, in order to separate the paired twisted wires 2, 2,... In a non-contact manner, the paired twisted wires 2, 2,.

  The shield 2c is composed of a plastic tape and an aluminum foil-attached plastic tape, and is a shield in which the single wire conductor 2a is first covered with a plastic tape and further covered with an aluminum foil-attached plastic tape.

  The single wire conductors 2a constituting the respective twisted wires 2, 2,... Are covered with a crosslinked foamed polyethylene resin. The crosslinked foamed PE is an insulator having a foaming degree of 50 to 60% and a crosslinking degree of 65% or more, and preventing collapse by crosslinking.

  As shown in FIG. 5, there are four pairs of twisted wires 2, and each pair of twisted wires 2, 2, 2, 2 is covered with a plastic tape and further covered with an aluminum foil-attached plastic tape, and is not contacted The diameter of the single wire conductor 2a is 0.8 mm, the diameter after coating 2b with the irradiation cross-linked foamed PE is 1.9 mm, and the twist pitch of each pair of twisted wires 2, 2, 2, 2 is When the diameter of the balanced cable for LAN 1a after being collectively covered with the sheath 4 was 11.5 mm, the result shown in FIG. 6 was obtained.

  The result of FIG. 6 is a measurement value at a cable length of 128 m, and a good result is obtained with respect to the TIA / EIA CAT5E standard value (cable length of 100 m). The propagation delay time is 560 ns at 1 MHz and 533 ns at 100 MHz, which is a result of the standard value or less. Further, in all other CAT5E characteristics, the cable length of 128 m satisfies the standard value.

  As described above, even if the cable length is 100 m or more, the performance of the CAT5E standard has been cleared. Therefore, even if the total length between devices that could not be connected with the LAN balanced cable is 100 m or longer, the LAN balanced cable You can connect with peace of mind.

  FIG. 7 shows a case where a single wire conductor covered with a cross-linked foamed polyethylene resin is twisted to provide four pairs of twisted wires, and all the twisted wires are collectively covered with a sheath. It is a figure showing the result of having measured the relationship of the foaming degree of polyethylene foam, a crosslinking degree, a twist pitch, and propagation delay time at the frequency of 1 MHz. When the foaming degree was 50 to 60% and the crosslinking degree was 65% or more, the twisting pitch was 14.0 mm or more, the propagation delay time was 560 ns or less, and the results sufficiently satisfying the CAT5E standard were obtained.

  Also, by increasing the twisting pitch, the characteristics of near end crosstalk attenuation and far end crosstalk attenuation between each pair of twisted wires tend to deteriorate. Therefore, it is necessary to suppress the deterioration of the crosstalk attenuation.

  FIG. 8 shows the twisted pitch of the twisted pair wire and the near end in a balanced cable length for LAN of 120 m, in which each twisted wire is separated in a non-contact manner by a cross and is provided with all the twisted wires covered with a sheath. It is a figure showing the result of having measured the relation of crosstalk attenuation. The result is a minimum margin value for the CAT5E standard in the range of 1-100 MHz. A result satisfying the CAT5E standard was obtained at a twist pitch of 20.0 mm or less.

  Therefore, as shown in FIG. 7 and FIG. 8, the single wire conductor covered with a crosslinked foamed polyethylene resin having a foaming degree of 50 to 60% and a crosslinking degree of 65% or more is twisted together as shown in FIG. For LAN with a pair of two twisted wires with a twist pitch of 14.0 to 20.0 mm, each pair twisted wires are separated in a non-contact manner by interposing a cross, and all the twisted wires are collectively covered with a sheath With a balanced cable, it is possible to obtain characteristics of propagation delay time and near-end crosstalk attenuation that satisfy the CAT5E standard even when the cable length is 120 m.

  FIG. 9 shows a balanced cable for LAN in which four pairs of twisted wires are separated in a non-contact manner by a shield shield covered with plastic tape and further covered with a plastic tape with aluminum foil, and all twisted wires are collectively covered with a sheath. It is a figure showing the result of having measured the relationship between the twist pitch of a twisted pair wire, and near end crosstalk attenuation amount in length 120m. The result is a minimum margin value for the CAT5E standard in the range of 1-100 MHz. Results satisfying the CAT5E standard were obtained up to a twist pitch of 40.0 mm.

  Accordingly, as shown in FIG. 7 and FIG. 9, the single wire conductor covered with a crosslinked foamed polyethylene resin having a foaming degree of 50 to 60% and a crosslinking degree of 65% or more is twisted together as shown in FIGS. Two pairs of twisted wires with a twist pitch of 14.0 to 40.0 mm are provided in pairs, with each pair of twisted wires separated in a non-contact manner by a pair of shields covered with an aluminum foil-attached plastic tape. In the LAN balanced cable in which the sheath is covered with the sheath, the propagation delay time and near end crosstalk attenuation characteristics satisfying the CAT5E standard can be obtained even when the cable length is 120 m.

  Since the balanced cable for LAN according to the present invention can be wired exceeding the total cable length of 100 m with the performance of CAT5E, it greatly contributes to various areas for constructing a network.

1 LAN balanced cable 1a LAN balanced cable 2 twisted wire 2a single wire conductor 2b sheath 2c shield 3 cross interstitial 4 sheath 5 collective shield

Claims (2)

Even if the cable length is 100m or more, it is a balanced cable for LAN having enhanced category 5 performance,
A pair of twisted wires having a twist pitch of 14.0 to 20.0 mm by twisting single conductors covered with a crosslinked foamed polyethylene resin having a foaming degree of 50 to 60% and a crosslinking degree of 65% or more, Each cross-twisted wire is separated in a non-contact manner by interposing a cross,
A balanced cable for LAN, in which all twisted wires are collectively covered with a sheath. Even if the cable length is 100m or more, it is a balanced cable for LAN having enhanced category 5 performance,
Twisting a single conductor coated with a crosslinked foamed polyethylene resin having a foaming degree of 50 to 60% and a crosslinking degree of 65% or more, a pair of twisted wires having a twist pitch of 14.0 to 40.0 mm, A balanced cable for LAN, wherein each twisted pair wire is separated in a non-contact manner by a shield shield covered with a plastic tape and further covered with an aluminum foil-attached plastic tape.

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