JP3042169U - Digital public line resale device - Google Patents

Abstract

(57) [Abstract] [Problem] To replace a conventional leased line, a large number of digital public lines are bundled so that the peak of the call volume concentrates in a specific short time, and the cost is intended for users who do not lock the line for a long time. Provides highly effective line resale service. SOLUTION: PBXs 1, 1 and TDMs 2, 2 are provided at communication bases.
Are installed facing each other, and one end of TDM2, 2 is connected to PBX1, 1
, And connect the other end to the high-speed digital dedicated line 3,
Connect the user's telephone 4 to the BX1, 1
The telephone service is provided by multiplexing the time slots into 23 time slots.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an apparatus for providing resale service by providing a user with a digital public line that has been bundled by a second-class electricity carrier by TDM.

[0002]

[Problems to be solved by the device]

 From April 1995, it has become possible to make outgoing calls from privately-owned private networks and receive incoming calls to public telephone networks, and vice versa, so-called public-private connections. As a result, it became possible to rent a leased line from a Type 1 electricity carrier as a Type 2 electricity carrier and resell this leased line to an unspecified number of users.

This leased line resale service installs a time division multiplexer (TDM) at both ends of a high-speed digital leased line to make the leased line large in bundle and reduce the leased charge per line, which is common to users. It is sold separately at a price lower than the communication charge.

The leased leased line is generally assigned in accordance with the peak call volume so that congestion is unlikely to occur. However, during times other than peak hours, the line utilization rate decreases and the leased charge becomes expensive. In addition, since a backup line is prepared in case of an accident or failure, the running cost will increase accordingly.

Therefore, the present invention is a cost-effective method for a user who has a large bundle of digital public lines instead of the conventional dedicated line and the peak of the call volume concentrates in a specific short time and does not lock the line for a long time. It was designed to provide resale services for high-quality lines.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention is configured as follows.

That is, a time division multiplexer (TDM) and a private branch exchange (PBX) are connected to opposite ends of a digital public line, and the PBX is connected to a public telephone network to provide a communication service to users. It is a digital public line resale device characterized by:

[0008]

[Embodiment of the invention]

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a digital public line resale device embodying the present invention. The digital public line resale device installs PBX1, 1 and TDM2, 2 facing each other at the communication base, connects one end of TDM2, 2 to PBX1, 1 and the other end to high-speed digital leased line 3, respectively, and connects PBX1, The user's telephone 4 is connected to 1.

The PBXs 1 and 1 are connected to the telephone 4 via an external public communication network interface and convert a 4 KHz voice signal input from the transmitting side telephone 4 through a station line into a 64 Kbps digital signal. Then, the gate switch at the intersection of the incoming route and the outgoing route is opened and closed to exchange with the telephone 4 on the receiving side, and the 64 Kbps digital signal input from the telephone 4 on the receiving side is converted to the original 4 KHz voice signal. Decrypt.

The TDMs 2 and 2 are connected to the PBXs 1 and 1 via a PBX-TDM digital interface (individual line signaling system), and 30 channels of 64Kbps information channels are multiplexed in 32 time slots.

The ISDN line 3 connects the TDMs 2 and 2 via the TDM-TDM interface, and uses the INS Net 1500 service to multiplex an information channel (B channel) of 64 Kbps into 23 time slots. Simultaneous transmission.

The digital public line resale device embodying the present invention is configured as described above, and connects the opposing TDMs 2 and 2 via the ISDN line 3 and connects to the TDMs 2 and 2 using the INS Net 1500 service. PBXs 1 and 1 are multiplexed into 23 time slots to provide communication service.

Currently, the monthly charge for the high-speed digital leased line between Tokyo and Osaka is a flat-rate system. In the case of 5 Mbps, it is 2,700,000 yen. On the other hand, the monthly communication fee for an ISDN line with the same level of communication capacity is pay-as-you-go, and is 4.5 seconds for 60 yen (800 yen for 1 minute) for the INS Net 1500 service at 1.5 Mbps. Therefore, if this is simply compared with the dedicated charge and the communication charge, if the ISDN line is used for 56.25 hours a month, the communication charge will be the same as the exclusive charge for the high-speed digital leased line.

Therefore, when the monthly communication time is less than 56.25 hours, the charge is cheaper when using the ISDN digital public line than when using the high-speed digital leased line. In the case of a digital public line, it is not necessary to prepare a backup line, but it is necessary in the case of a dedicated line. If you prepare a backup line at a ratio of 1: 1, the price will double, large discounts and long-term use. If you simply calculate by ignoring discounts such as discounts, the special charges for high-speed digital leased lines will be ¥ 5,400,000 per month. When compared with this charge, if the ISDN line is used for 112.5 hours a month, the communication charge will be the same as the high-speed digital leased line charge. Below this, the ISDN line will be used rather than the high-speed digital leased line. The fee is cheaper if you use a digital public line.

[0016]

[Effect of the invention]

 As described above, the digital public line resale device of the present invention provides a line resale service by enlarging a bundle of digital public lines instead of the conventional dedicated line. Therefore, according to the present invention, communication and calls are concentrated in a specific short time, the monthly usage time is short, and it is effective in a resale service for users whose communication charges are less than a fixed charge. Since a backup line is not required, the running cost can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 is a block diagram of a digital public line resale device embodying the present invention.

[Explanation of symbols]

 1 PBX 2 TDM 3 ISDN line 4 Telephone

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location H04Q 3/58 101 H04Q 3/58 101 11/04 11/04 R

Claims (1)

[Utility model registration claims] 1. A digital public line is connected to both ends of a time division multiplexer (TDM) and a private branch exchange (PBX), and the PBX is connected to a public telephone network to provide a communication service to users. A digital public line resale device characterized in that