JPH0421251A - Modem pooling device - Google Patents

Abstract

PURPOSE:To attain the data transmission between an analog subscriber and an ISDN subscriber with an ISDN exchange not provided with an analog subscriber circuit by connecting a MODEM pooling device converting a signal from of a data signal of the ISDN subscriber and of a data signal of the analog subscriber directly to a time division switch in the ISDN exchange. CONSTITUTION:A data signal of an ISDN subscriber terminal equipment 1 inputted to a MODEM pooling device 13 via a time division switch 11 is given to a rate adaptor 9-1, the data speed is converted into a data signal speed of the analog subscriber and the resulting data is fed to a MODEM 8-1. Moreover, a data signal of the analog subscriber data terminal equipment 2 is converted into an analog data signal by a MODEM 3, converted into a PCM coding data signal by an exchange being a component of a public telephone exchange network 15 and fed to a time division multiplexer demultiplexer 6 of the MODEM pooling device 13 via a connection trunk 12 and a time division switch 11 of the ISDN exchange 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a modem pooling device for exchanging data between analog subscribers and ISDN subscribers, and in particular to a modem pooling device for exchanging data between analog subscribers and ISDN subscribers. The present invention relates to a modem pooling device directly accommodated in a switch.

[Conventional technology]

Conventionally, this type of modem pooling device 13 is composed of a plurality of network termination devices, terminal adapters, and modems, as shown in FIG.
-n and analog subscriber lines 19-1 to 19-n, and accommodated under ISDN subscriber circuits 10-1...10-n and analog subscriber circuits 17-1...17-n. It had been.

The output data of a data terminal operator who is an I SDN subscriber is
I via terminal adapter 4 and network termination device 5
After being interfaced with the SDN subscriber line, the ISDN
ISDN subscriber circuit 10-1 of exchange 14. Time division switch 11. It is connected to the modem pooling device 13 via an ISDN subscriber line 18-1. In the modem pooling device 13, the data signal from the data terminal 1 is terminated (layer 1) by the network termination device 6, and the data signal speed of the ISDN subscriber is converted to the signal speed of the analog subscriber by the terminal adapter 7. and is converted into an analog signal by modem 8. The data output converted into an analog data signal by the modem 8 is connected to an analog subscriber circuit 10=1 via an analog subscriber line 19-1, and is connected to a time division switch 11. Connection trunk 12. It is connected to the modem 3 via the public switched telephone network 15. The modem 3 converts analog data signals from the public switching network 15 into digital data signals, is connected to the data terminal 2, and data is transmitted between the data terminals 1 and 2.

[Problem to be solved by the invention]

The conventional modem pooling device described above is ISDN
Because it is accommodated under the subscriber circuit and analog subscriber circuit within the exchange, in ISDN exchanges that are not equipped with analog subscriber circuits, the The drawback was that data transmission was impossible. Furthermore, it is necessary to install dedicated ISDN subscriber lines and analog subscriber lines within the ISDN exchange, which has the disadvantage of complicating the interior of the ISDN exchange and hindering economicalization.

An object of the present invention is to provide an analog subscriber circuit by directly connecting a modem pooling device that converts the signal format of an ISDN subscriber data signal and an analog subscriber data signal to a time division switch in an ISDN exchange. Even if an ISDN switch that does not have
An object of the present invention is to provide a modem pooling device capable of data transmission with DN subscribers.

[Means to solve the problem]

The modem pooling device of the present invention can connect analog subscribers accommodated in a public switched telephone network and I/O subscribers accommodated in an ISDN network.
IS to exchange data with SDN subscribers.
In a modem pooling device accommodated in a DN exchange, a plurality of rates convert an I SDN subscriber data signal rate received by the I SDN exchange from an I SDN subscriber accommodated in the I SDN network into an analog subscriber signal rate. an adapter, a plurality of modems that convert the rate adapter output data into analog data signals, a plurality of codecs that encode the analog data signals output by the modems, and time division multiplexing of the encoded data signals output by the codecs. an ISDN/analog subscriber data conversion function comprising a time division multiplex circuit for separating time division multiplexed encoded data signals received by the ISDN switch from analog subscribers accommodated in the public switched telephone network; a time division separation circuit, a plurality of codecs that decode the separated data outputs into analog signals, and a plurality of modems that convert the analog signals output by the codecs into digital signals;
The analog subscriber signal speed output by the modem is I SD
and an analog/ISDN subscriber data conversion function consisting of a plurality of rate adapters to convert to N subscriber data signal rates.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 1 shows an ISDN subscriber data terminal 1, an analog subscriber data terminal 2, a modem 3, a data terminal 1 and an I
A terminal adapter 4 that interfaces with SDN subscriber signals, a network termination device 5 that terminates layer 1 of the ISDN network, and ISDN subscriber circuits 10-1...1
0~n1 time division switch 11. Connection trunk 12. IS
It is composed of an ISDN exchange 14 comprising a modem pooling device 213 that converts data signal formats of DN subscribers and data signal formats of analog subscribers, and a public switched telephone network 15.

Note that the modem pooling device 213 includes a time division multiplexing/demultiplexing device 6 that time division multiplexes and demultiplexes encoded data signals, and a PC.
Codecs 7-1...7-n that convert M-encoded data signals to analog data signals and analog data signals to PCM-encoded signals, respectively, and a modem 8- having A/D and D/A conversion functions. 1...8-n, and rate adapters 9-1...9-n for converting the data signal rate of ISDN subscribers and the data signal rate of analog subscribers.

The I SDN subscriber data terminal 1 is connected to a terminal adapter 4. I of the I SDN exchange 14 via the network termination bag W5
It is connected to the SDN subscriber circuit 10-1. On the other hand, the analog subscriber data terminal 12 is accommodated in the public switched telephone network 15 via the modem 3, and the public switched telephone network 15 is connected to the ISD
It is connected to the connection trunk 12 of the N exchange 14. ISD
The time division switch 11 of the N exchange connects the ISDN subscriber data terminal 1 and the analog subscriber data terminal 2.

A modem pooling device 13 connected to the time division switch 11 performs conversion between ISDN subscriber data signals and analog subscriber data signals.

Modem pooling device 13 via time division switch 11
The data signal of ISDN subscriber terminal 1 input to
Connected to rate adapter 9-1. rate adapter 9
-1, it is converted to an analog subscriber data signal rate and connected to modem 8-1. The data signal of the rate adapter 9-1 is converted into an analog data signal by the modem 8-1, connected to the codec 7-1, and converted into a PCM-encoded data signal by the codec 7-1. PCM encoded signals similarly generated by a plurality of codecs are time-division multiplexed by a time-division multiplexing/demultiplexing device 6, and then sent to a time-division switch 11. It is connected to the public switched telephone network 15 via a connecting trunk 12 . Analog subscriber data terminal 2 on public switched telephone network 15
is selected and connected to modem 3. The modem 3 converts this data into a digital data signal, connects it to the analog subscriber's data terminal 2, and data transmission takes place between the data terminals 1 and 2. Further, the data signal of the analog subscriber data terminal 2 is converted into an analog data signal by the modem 3, and further converted into a PCM encoded data signal by the corresponding exchange forming the public switched telephone network 15. This PCM
The encoded data signal is time-division multiplexed by the public switched telephone network 15 with other PCM encoded data signals and
Connection trunk 124 of N exchange 14 Time division switch 11
It is connected to the time division multiplexing/dividing device 6 of the modem pulling device 13 via. In the time division multiplexing/division bag W6, the time division multiplexed PCM encoded data signal is separated and converted into an analog data signal in the codec 7-1. This analog data signal is converted into a digital data signal by the modem 8-1, and further converted into an IS signal by the rate adapter 9-1.
It is converted to the data signal rate of the DN subscriber and sent to the data terminal l via the time division switch 11 and the ISDN subscriber circuit 10-1. In this way, between the data terminal 1 on the ISDN subscriber side and the data terminal 2 on the analog subscriber side,
It becomes possible to send and receive data.

〔Effect of the invention〕

As explained above, the present invention provides a modem pooling device that converts the signal format of an ISDN subscriber's data signal and an analog subscriber's data signal by directly connecting it to a time division switch in an ISDN exchange. This has the effect that data transmission between analog subscribers and ISDN subscribers is possible even with an ISDN exchange that is not equipped with a subscriber circuit.

Further, since it is not necessary to install ISDN subscriber lines and analog subscriber lines within the ISDN exchange, there is an effect that the complexity inside the ISDN exchange is eliminated and economicalization is achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a block diagram showing a conventional example of a modem pooling device. 1... I SDN subscriber side data terminal, 2... Analog subscriber data terminal, 3 modem, 4... Terminal adapter, 5... Network termination device, 6... Time division multiplexing
Separation device, 7-1 to 7-n... Codec, 8-1 to
8-n...modem, 9-1 to 9-n...rate adapter, 10-1 to l0-n--ISDN subscriber circuit,
11... Time division switch, 12... Connection trunk,
13...Modem pooling device, 14...I SD
N switchboard, 15...Public telephone switched network, 17-~17-
n...Analog subscriber circuit, 18-1 to 18-n. ISDN subscriber line, 19-1 to 19-n-...analog subscriber line.

Claims (1)

[Claims] Analog subscribers and ISDs accommodated in the public switched telephone network
In a modem pooling device accommodated in an ISDN exchange for exchanging data with ISDN subscribers accommodated in the ISDN network,
a plurality of rate adapters for converting ISDN subscriber data signal rates received by the ISDN switch from subscribers to analog subscriber signal rates; a plurality of modems for converting the rate adapter output data to analog data signals; ISDN consisting of a plurality of codecs that encode output analog data signals and a time division multiplexing circuit that time division multiplexes the encoded data signals output by the codecs.
an analog subscriber data conversion function, a time division separation circuit for separating time division multiplexed encoded data signals received by the ISDN exchange from analog subscribers accommodated in the public switched telephone network, and the separated data output; a plurality of codecs that decode the analog signals into analog signals, a plurality of modems that convert the analog signals output by the codecs into digital signals, and an IS
1. A modem pooling device having an analog/ISDN subscriber data conversion function comprising a plurality of rate adapters for converting into a DN subscriber data signal format.