JPH0646163A - Method and device for supplying power source for private branch modem - Google Patents

Abstract

PURPOSE:To supply a direct current voltage to a private branch MODEM without providing a plug socket for a direct current power source at each private branch MODEM by supplying the direct current voltage from a signal direct current power source by using a multi-conductor communication cable corresponding to each private branch MODEM. CONSTITUTION:The direct current voltage is supplied from a large capacity direct current power source 106 being the single power source of a base station side through a private branch communication patch panel 107, 8-conductor twist cables 105 and 115, 8-electrode modular connectors 104 and 114, and 8-conductor modular cables 103 and 113 to private branch MODEMs 102 and 112. Next, the direct current voltage is supplied from a large capacity direct current power source 136 being the single power source of an opposed station side through a private branch communication patch panel 137, 8-conductor twist cables 125 and 135, 8-electrode modular connects 124 and 134, and 8-conductor modular cables 123 and 133 to private branch MODEMs 122 and 132.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for supplying power to a local modem (modulation / demodulation apparatus).

[0002]

2. Description of the Related Art Generally, a local modem operates by receiving a necessary power source from the outside, and a power outlet for the power source is required near its installation place.

In order to reduce the size of the indoor modem, a method has been adopted in which a direct current power supply device is externally attached as an accessory and is connected to a power outlet to supply power to the main body of the indoor modem.

An example thereof is shown in FIG. In addition, in FIG.
The case of channel (two facing) connection is shown. On the base station side, terminal devices 1 and 11, local modems 2 and 12, and 8
The core modular cables 3 and 13, the 8-pole modular connectors 4 and 14, the 4-core twisted pair cables 5 and 15, and the DC power sources 6 and 16.

On the opposite station side, terminal devices 21 and 31, local modems 22 and 32, and 8-core modular cables 23 and 33 are provided.
, 8-pole modular connectors 24, 34, and DC power supply 2
It is composed of 6,36.

The DC voltage supply on the side of the base station is performed as follows. First, in the local modem 2,
A DC voltage is supplied from the DC power supply 6 through the 8-pole modular connector 4 and the 8-core modular cable 3.

Next, in the local modem 12, a DC voltage is supplied from the DC power supply 16 through the 8-pole modular connector 14 and the 8-core modular cable 13. on the other hand,
The DC voltage supply on the opposite station side is performed as follows.

First, in the local modem 22, a DC voltage is supplied from the DC power supply 26 through the 8-pole modular connector 24 and the 8-core modular cable 23. Next, in the local modem 32, a DC voltage is supplied from the DC power supply 36 through the 8-pole modular connector 34 and the 8-core modular cable 33.

The operation for data transmission is performed as follows. First, the data of the terminal device 1 on the base station side is
It becomes a carrier in the local modem 2, enters the 8-pole modular connector 24 on the opposite station side through the 8-core modular cable 3, 8-pole modular connector 4, 4-core twisted pair cable 5, and then through the 8-core modular cable 23. Two
2, the data is reproduced here, and the data is transmitted to the terminal device 21.

Next, the data of the terminal device 11 on the side of the base station serves as a carrier at the local modem 12, and through the 8-core modular cable 13, the 8-pole modular connector 14 and the 4-core twisted pair cable 15, the data of the opposite station side 8 is transmitted. The data enters the polar modular connector 34 and enters the local modem 32 via the 8-core modular cable 33, where the data is reproduced and the data is transmitted to the terminal device 31.

[0011]

However, in the conventional system shown in FIG. 4, the 8-core modular cables 3, 13, 23, 33 are used.
Since the frequency characteristics are limited by the internal line capacitance,
The limit of the distance L1 of the core modular cables 3, 13, 23, 33 is reduced to, for example, 10 m, so that the terminal devices 1, 11, 2, are located near the DC power sources 6, 16, 26, 36.
1, 31 and local modems 2, 12, 22, 32 must be arranged, and the data transmission device cannot be installed flexibly.

Since a DC power source is required for each channel, the number of AC outlets may be insufficient when the number of channels increases. Further, since the DC power source can be freely installed on the desk or floor, there is a drawback that the aesthetics and safety of the office space are impaired when the number of DC power sources increases.

Further, with the development of information communication, the demand for local modems as a remote communication means is increasing, and accordingly, there is a tendency to be installed everywhere in the office. for that reason,
Although the power outlets, DC power supplies, etc. are installed according to the number of local modems, and the internal modems are becoming smaller and smarter, the inside of the office is becoming more complicated.

[0014] By the way, the wiring system of electric wires and cables used for communication connected to a local modem is generally a star type, which is a conventional star type, which is concentrated and gathered on a terminal board. Recently, using these wiring forms, many pairs of cables are pre-wired and terminated at each connection port.
A wiring method that can be used as wiring for a multipurpose information system (for example, PDS (Premises Distr.
ibution System: Integrated information wiring system)) is commercially available.

FIG. 5 shows the wiring structure of a PDS manufactured by AT & T Co., USA. In FIG. 5, reference numeral 7 is a concentrator or end board of a 110 cross-connect terminal block or 110 wiring block for concentrating and terminating wiring.

Reference numeral 8 denotes cables connected to the concentrator or the end board 7. Reference numeral 9 is an information outlet (hereinafter referred to as IO). The IO9 is an 8-pin modular jack in the EIA / TIA-568 that serves as a connection port for information devices such as telephones, LAN workstations, and information terminals.
It is made of standardized N connection port.

The pin assignments for connecting the cables 8 and IO9 are as shown in the PDS design manual.
A local modem (not shown) is connected to IO9.

However, even in the wiring structure of this PDS,
A DC power adapter was required to supply DC power to each local modem. Therefore, there is a problem similar to the above wiring method.

The present invention has been made in order to solve such a conventional problem, and an object thereof is to supply a DC voltage to a local modem without providing a DC power outlet for each local modem. The present invention provides a method and apparatus for supplying power to a local modem.

[0020]

According to a first aspect of the present invention, there is provided a method for supplying power to a local modem, wherein a plurality of local modems are operated by supplying a DC voltage from the outside, and a single DC power source is provided for each local modem. A direct current voltage is supplied using a core communication cable.

According to a second aspect of the present invention, there is provided a power supply device for a local modem, a single direct current power supply device, a concentrator panel which is connected to the single direct current power supply device through an electric wire, and to which a communication electric wire or cable is attached. A multi-core communication cable that is attached to the central board and connects the single DC power supply to the communication wire or cable, an information outlet provided at the end of this multi-core communication cable, and a single direct cable that is attached to this information outlet. It is composed of a local power supply device and a local modem connected to a communication wire or cable.

[0022]

According to the present invention, the DC voltage can be supplied from the single DC power source to the plurality of local modems by using the multi-core communication cable.

According to the second aspect of the present invention, since the single DC power supply device is connected to the concentrator, the electric wire or cable wired to each connection port of the multi-core communication cable connected to the concentrator is used for communication. It is possible to power multiple premises modems using a number other than the number of cores required.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a power supply method for a local modem according to claim 1. In this embodiment, 2
The case of channel (two facing) connection is shown.

On the base station side, the terminal devices 101 and 111,
Local modems 102 and 112 and 8-core modular cable 1
03,113 and 8-pole modular connectors 104,114
And 8-core twisted pair cable (multi-core communication cable) 1
05, 115, a large-capacity DC power supply 106 that is a single power supply on the base station side, a patch panel (concentrator or end board) 107 for internal communication, and an N-core twisted pair cable (N ≧ 4)
It is composed of 108.

On the opposite station side, terminal devices 121 and 131,
Local modems 122 and 132 and 8-core modular cable 1
23, 133 and 8-pole modular connectors 124, 134
And 8-core twisted pair cable (multi-core communication cable) 1
25 and 135, a large-capacity DC power source 136 which is a single power source on the opposite station side, and a patch panel (concentrator or end panel) 137 for local communication.

First, in this embodiment, the DC voltage supply on the base station side is performed as follows. First, in the local modem 102, the large-capacity DC power source 106, which is a single power source on the base station side, switches to the local communication patch panel 107,
8-core twisted cable 105, 8-pole modular connector 1
DC voltage is supplied through the 04- and 8-core modular cable 103.

Next, in the local modem 112, the large-capacity DC power source 106, which is a single power source on the base station side, is connected to the local communication patch panel 107 and the 8-core twisted cable 11.
DC voltage is supplied through the 5- and 8-pole modular connector 114 and the 8-core modular cable 113.

Next, in this embodiment, the DC voltage supply on the opposite station side is performed as follows. First, in the local modem 122, the large-capacity DC power source 136, which is a single power source on the opposite station side, is connected to the local communication patch panel 137.
8-core twisted cable 125, 8-pole modular connector 1
DC voltage is supplied through the 24 and 8-core modular cables 123.

Next, in the local modem 132, the large capacity DC power source 136, which is a single power source on the opposite station side, the patch panel 137 for local communication, and the 8-core twisted cable 13 are used.
DC voltage is supplied through the 5- and 8-pole modular connector 134 and the 8-core modular cable 133.

In the present embodiment, the data transmission operation is performed as follows. First, the data of the terminal device 101 on the base station side becomes a carrier in the local modem 102, and enters the local communication patch panel 107 via the 8-core modular cable 103, the 8-pole modular connector 104, and the 8-core twisted pair cable 105.

Here, the data is relayed to the pin number corresponding to the necessary address on the opposite station side (for example, the address of the terminal device 121) and enters the patch panel 137 for local communication via the N-core twisted pair cable 108.

Then, the 8-core twisted pair cable 125 is relayed to the pin number corresponding to the required address on the opposite station side (for example, the address of the terminal device 121).
8-pole modular connector 124, 8-core modular cable 1
The data enters the local modem 122 via 23, where the data is reproduced and transmitted to the terminal device 121.

Next, the data of the terminal device 111 on the base station side becomes a carrier in the local modem 112, and the patch panel for local communication is sent via the 8-core modular cable 113, the 8-pole modular connector 114, and the 8-core twisted pair cable 115. Enter 107.

Here, the data is relayed to the pin number corresponding to the required address on the opposite station side (for example, the address of the terminal device 131) and enters the patch panel 137 for local communication via the N-core twisted pair cable 108.

Then, the 8-core twisted pair cable 135 is relayed to the pin number corresponding to the required address on the opposite station side (for example, the address of the terminal device 131).
8-pole modular connector 134, 8-core modular cable 1
It enters the local modem 132 via 33, where the data is reproduced and the data is transmitted to the terminal device 131.

As described above, according to this embodiment, the distance L2 between the 8-core twisted pair cables 105, 115, 125 and 135 is such that, in carrier transmission, the characteristic impedance of the twisted pair cable is equal to the inductance component per unit length and the unit. Since it is determined by the square root of the ratio of the capacitor portion per length, the characteristic impedance does not change even if the cable length is extended, compared to the distance L1 of the 8-core modular cables 3, 13, 23, 33 shown in the conventional method of FIG. The distance can be extended up to about 100 times (for example, 1000 m).

Also, the 8-core twisted pair cable 105, 1
In the DC voltage supply, the distance L2 of 15, 125 and 135 is equal to the DC current flowing from the large capacity DC power sources 106 and 136 and the 8-core twisted pair cables 105, 115 and 12.
Limited by the voltage drop due to the product of the internal resistance of 5,135,
The power supply system can be used over a relatively long distance (for example, 100 m).

Therefore, according to the present embodiment, the 8-core twisted pair cables 105, 115, 1 used for the DC voltage supply.
Since the distance of 25,135 can be extended, data transmission on the premises can be flexibly operated.

Further, according to the present embodiment, the large capacity DC power supplies 106 and 136, which are single DC power supplies, are used to connect the 8-core twisted pair cables 105, 115, 125 and 135.
In addition to supplying DC voltage to one channel, the 8-core twisted pair cable 105, 115, 125, 135 length is adopted as a power supply system for a relatively long distance, and the system system is combined with the patch panels 107, 137 for local communication. By configuring, the data transmission device can be flexibly arranged, the number of DC power outlets can be reduced when the number of channels is increased, and the aesthetics of the office space and the safety can be improved. it can.

FIG. 2 shows an embodiment of a power supply device for a local modem according to the present invention. In the figure, 2
00 is a single DC power supply device, 210 is a concentrator, and 220 is 8
Core twisted pair cable, 230 is an IO (information outlet), and 240 is a local modem.

Output terminal 20 of single DC power supply device 200
Electric wires 203 and 204 are attached to 1, 202. The electric wires 203 and 204 are connected to the 7th pin 217 and the 8th pin 218 of the distribution board 210, respectively.

The concentrator 210 is provided with the first pin 211 to the eighth pin 218. For the first pin 211 to the eighth pin 218, the cable 2 of the first pair A to the fourth pair D of the 8-core twisted pair cable (multicore communication cable) 220.
21 to 228 are attached as follows.

Cables 221 and 222 of the first pair A are attached to the first pin 211 and the second pin 212, and a cable 22 of the second pair B is attached to the third pin 213 and the fourth pin 214.
3 and 224 are attached, 5th pin 215 and 6th pin 21
Cables 225 and 226 of the 3rd pair C are attached to 6 and cables 227 and 228 of the 4th pair D are attached to 7th pin 217 and 8th pin 218.

In addition, 1 of 8-core twisted pair cable 220
The cables 221 to 228 of the number pair A to the fourth pair D are I
It is similarly attached to O (information outlet) 230.

Then, the 7th pin pin 237 of IO230
And the 8th pin 238 are the 7th pin pin 247 and the 8th pin pin 24 of the local modem 240 via the electric wires 243 and 244.
Connected to 8.

The IO 230 is provided with the first pin 231 to the eighth pin 238 so as to be connected to the local modem 240. In the PDS, the local modem 240 is used for communication with pins 3 and 4 (not shown).
No. 6 pin, No. 6 pin, No. 7 pin 247, No. 8 pin 2
No. 48 is unused.

Therefore, the unused 7th pins 247 and 8
If the pin 248 is used as the DC power supply line of the present invention, as shown in FIG. 2, the 1st pair A to 4th pair D of the 8-core twisted pair cable 220 from each IO 230 in the concentrator 210. Unused pins (7
The output terminal 20 of the single DC power supply device 200 is connected to the 7th pin pin 237 and the 8th pin 238 (terminal) connected to the 4th pair D corresponding to the 4th pin and 8th pin).
1, 202, and by connecting the power supply to the local modem 240 from the 7th pin 237 and the 8th pin 238 of the IO 230, the power supply to the local modem 240 is as shown in FIG. An electric wire for communication and an electric wire for power supply can be shared by only the cables 8.

As described above, according to the present embodiment, the power source is prepared on the side of the concentrator so that the number of cores other than the required number of cores used for communication can be selected from the wires and cables wired to the respective connection ports. It is not necessary to prepare a power supply for the local modem in the vicinity by using the power source to simplify the surroundings of the equipment, it is tidy, and the power supply is supplied from the side of the concentrator. It is supplied from the connection port, and it is not necessary to consider a power outlet for each local modem, and it becomes easy to move the local modem as the equipment moves.

FIG. 3 shows an embodiment of a power supply device for a local modem according to claim 2. In the present embodiment, the terminal portion of the fourth pair D connected to the output terminal of the DC power source on the side of the concentrator 210 is provided with a plurality of local modems 24.
Since the terminal of the 4th pair D on the concentrator side of the 8-core twisted pair cable 220 coming from the IO 230 to which 0 is connected is connected by the japer cable 219, a plurality of local modems 24
It is possible to freely supply power to 0.

Although the case where the PDS is applied has been described in the embodiments shown in FIGS. 2 and 3, the present invention is not limited to this.

[0052]

As described above, according to the first aspect of the present invention, it is possible to supply a DC voltage from a single DC power source to a plurality of channels by using a plurality of multi-core communication cables (twisted pair cables). When the number increases, the number of DC power outlets can be reduced, and the aesthetics of the office space and the safety can be improved.

According to the second aspect, it is not necessary to provide the power source of the local modem near the local modem as in the conventional case.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing an embodiment of a power supply method for a local modem according to claim 1;

FIG. 2 is a structural explanatory view showing an embodiment of a power supply device for a local modem according to claim 2;

FIG. 3 is a structural explanatory view showing another embodiment of the power supply device for a local modem according to claim 2;

FIG. 4 is a configuration explanatory view showing a conventional data transmission device.

FIG. 5 is an explanatory diagram of a PDS configuration.

[Explanation of symbols]

102,112,122,132 Local modem 105,115,125,135 8-core twisted cable 106,136 Large capacity DC power supply 200 Single DC power supply device 203,204 Electric wire 210 Concentration board 220 8-core twisted cable 230 IO (Information outlet) ) 240 local modem

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 24, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

Claims (2)

[Claims] 1. A DC voltage is supplied from a single DC power source to a plurality of indoor modems that operate by supplying DC voltage from the outside, using a multicore communication cable compatible with each indoor modem. Power supply method for modem. 2. A single direct current power supply device, a concentrator for connecting to the single direct current power supply device through an electric wire, to which a communication electric wire or cable is attached, and a single direct current power supply device attached to the concentrator. And a communication wire or cable for connection to a communication wire or cable, an information outlet provided at the end of this multicore communication cable, and a single DC power supply unit attached to this information outlet to connect the communication wire or cable A power supply device for a local modem, which comprises a plurality of local modems.