JPH01120931A - Multiple access multiplex exchange system - Google Patents

Abstract

PURPOSE:To utilize a digital line with an opposite station efficiently by accommodating a multiple access multiplex circuit to a time division switch, connecting an output port to a digital line through the time division switch and increasing/decreasing the link number dynamically in response to the traffic. CONSTITUTION:When a call request is given from a terminal equipment DTE 12, a central control circuit CC 5 reads attribute information of the calling terminal equipment DTE 12 to identify its bit rate and selects an idle input port of a multiple access multiplex circuit HDT 4 and an idle slot on a multiplexed output port and the DTE 12 is connected to a DST 13 via a time division switch TDSW 2, an HDT 4 and a TDSW 3 (link). In selecting the idle slot, if an idle input port of the HDT 4 exists and no idle spot is on the output port, the circuit CC 5 sets a new link between the HDT 4 and the DTI to assign a call from the DTE 12 on the time slot. The circuit CC 5 controls the revision of number of links in response to the traffic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiplex multiplexing system, and more particularly to a multiplex multiplexing system in a digital network configured by connecting time division switches via digital transmission lines.

[Conventional technology]

There are various bit rates for calls exchanged by a time division switch. For example, for voice calls, 64kbps, 32kbps
kbps, 16kbps, 9.6kbps, and 2.4kbps for data calls.

Various speeds are used, such as 4.8 kbps, 9.6 kbps, and 19.2 kbps, and it is necessary to efficiently transmit these multiple calls.

Conventionally, as this type of multiple switching system, there are examples realized by a packet switching system and examples using a switch specially designed for multiple switching in a circuit switching system. Conventionally, multiple switching is not possible with the standard 64 kbps unit circuit switching equipment, so in order to improve transmission efficiency even a little, time slots on the transmission path are fixedly allocated in advance for each rate type. It was just a temporary thing.

[Problem that the invention seeks to solve]

However, the conventional method of fixedly allocating time slots described above has the disadvantage that transmission efficiency is not optimized because the predetermined allocation ratio for each bit rate differs from the actual call occurrence situation. be.

[Means for solving problems]

The multiplex multiplexing system of the present invention accommodates the input/output ports of a multiplex circuit provided independently of a time division switch in the time division switch, and connects the input port of the multiplex circuit to a calling terminal through the time division switch. a central control circuit that connects the output port to the digital line interface circuit through the time division switch, and controls the number of connection links between the output port and the digital line interface circuit so as to be changeable according to call occurrence conditions; It is characterized by having the following.

〔Example〕

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

FIG. 1 is a system block diagram showing an embodiment of the multiplex multiplexing system of the present invention.

In FIG. 1, a time division switch (hereinafter referred to as TDSW) 2 accommodates terminal equipment (hereinafter referred to as DTE) 11, 12, and 13. A digital trunk line to the opposite station is connected to the TDSW 2 via a digital trunk line interface circuit (hereinafter referred to as DTI) 3.

The input port of the multiplex circuit (HDT) 4 is TDSW.
2 through arrival/departure DTE], connected to 2.13, HD
The 'T' 4 output port is connected to DTI3 with multiple links through TDSW2. Central control circuit (hereinafter referred to as C
C) 5 is in charge of all sequence control of the time division switch.

In addition, DTI3 has a 64kbpsXj' time slot,
The input side of HDT4 is 64kbpsXm time slot,
It is assumed that the output side of HDT4 is composed of 64kbpsXn time slots.

It is also assumed that DTell is a terminal device with a bit rate of 64 kbps.

Here, the number n of time slots between the output port of HDT4 and the input of DTI3 depends on the CC
Set by 5. DT with various bit rates
El2, 13 are connected to the input port of HDT4,
Multiplexed on 64 kbps at T4.

Next, the operation of this embodiment will be explained.

For example, when a call request is issued from DTEL 2, when this call request is detected, the CC
5 reads the attribute information of the calling terminal DTE 12 and identifies its bit rate. This bit rate is 64kbp
s, the CC5 selects an empty input port of the HDT4 and an empty slot on the multiplexed output port. If both are empty, DTEl 2 selects TDSW2. HDT4. Connected to DTI3 via TDSW12 <link).

At the time of this vacant selection, if there is a vacant slot on the input port of HDT4 and there is no vacant slot on the output port, CC
Step 5 establishes a new link between HDT4 and DTI, and allocates the call from I) TE12 to that time slot. Furthermore, if there is no other time slot in use on the output port of the HDT 4 at the time of restoration, the link is restored.

In other words, in this embodiment, the CC 5 performs control to change the number of links according to traffic.

Note that since DTEII has a bit rate of 64kbps, calls from DTEll are routed to T without going through H[)T4.
It is directly connected to DTI3 via D'SW2.

〔Effect of the invention〕

As explained above, the present invention accommodates a multiple multiplex circuit in a time division switch, connects the output port of the multiple multiplex circuit to a digital line through the time division switch, and dynamically increases or decreases the number of links depending on the traffic. This has the effect of making it possible to efficiently use the digital line between the DTI input port, that is, the opposite station.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the multiplex multiplexing system of the present invention. 2... Time division switch (TDSW), 3... Digital trunk interface circuit (DTI), 4... Multiplex circuit (HDT), 5... Central control circuit (CC)
, 11, 12.13...Terminal equipment (DTE). Agent Patent Attorney Shinkou Uchihara 1 Sen

Claims (1)

[Claims] The input/output ports of a multiple multiplex circuit provided independently of the time division switch are accommodated in the time division switch, the input ports of the multiple multiplex circuit are connected to the calling/receiving terminal through the time division switch, and the output ports are connected to the time division multiplex circuit. A multi-source multiplexing device connected to a digital line interface circuit through a switch, and comprising a central control circuit that controls the number of connection links between the output port and the digital line interface circuit so as to be changeable according to call occurrence conditions. Exchange method.