JPS60261288A - Channel extension method of time division switch - Google Patents

Abstract

PURPOSE:To increase easily the number of channels by providing time division switches whose transmission-side highways and reception-side highways are so connected crosswise that one transmission-side highway is connected to the other reception-side highway. CONSTITUTION:Voice transmitted from a telephone set A is encoded and is subjected to 2 wire-4 wire conversion by a line circuit LCA. This voice passes a transmission-side highway SHWA of a switch element TSW1, a reception-side highway RHW7 of the element TSW1, a link connecting line l2, and a reception- side highway RHWB of a switch element TSW2 successively and is inputted to a line circuit LCB of a telephone set B and reaches the telephone set B. Similarly, voice transmitted from the telephone set B passes the circuit CLC, the highway SHWB, the highway RHW7, the link connecting line l2, the highway SHW7, and the highway RHWA and reaches the telephone set A.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a channel extension method for a time division switch used in a switch network of digital telephone equipment, such as a digital telephone exchange or digital button telephone equipment.

(Technical Background of the Present Invention) A typical time-division switch device integrated into an integrated circuit (IC) is composed of eight highways with a capacity of 32 channels, and therefore a single device can form a switch network of 256 channels. can be configured.

If more channels than the above are required, generally it is possible to provide more highways in the time division switch element or increase the number of channels per highway. The versatility of the device is reduced and it is not practical.

(Objective of the Present Invention) In view of the above, an object of the present invention is to obtain a method by which the number of channels can be expanded extremely easily by using a plurality of general-purpose time division switching elements.

(Summary of the present invention) For the above purpose, the unfired BA is configured to use some highways of a plurality of time division switch elements as links connecting the time division switch elements, Furthermore, the configuration is such that a channel to be used as a link is specified and used from among the channels that are connected (linked) between time-division switch elements.

(Embodiment of the present invention) Fig. 1 shows a block M1 of an embodiment configured to use all channels of a linked highway as a link. Fig. 2 shows a block M1 of an embodiment configured to use all channels of a linked highway as links. FIG. 3 is a diagram illustrating communication paths between telephones housed in different time division switches, and FIG. 4 is a block diagram of another embodiment. It is.

To explain the embodiment shown in FIG. 1, a plurality of time division switches, in this embodiment two time division switches TSWI'
+ TSW2 is a general-purpose one, for example 8 like the previous one.
It is assumed that an element with 932 channels per highway is used for this highway. Each of the eight highways has one way on the transmitting side, 5KNO-8HW, and one way on the receiving side, RHW. -RJIW.

, an eighth transmitter-side switch 5 of the first time-division switch element (hereinafter referred to as a switch element) TSW, an eighth receiver-side switch RHW of the switch element TSW, and is connected, and the first switch element TS
The eighth receiving highway RHW of the WI and the transmitting highway 5HW7 of the second switch element 'rsw= are each coupled in a crosswise manner by a link coupling line tl+Z2, and in this embodiment, the eighth All of the iway's channels, ie 32 channels, are used as links. Therefore, the number of links to which telephones, various trunks, etc. can be connected is seven for each switching element TSW+ and TSW2, and the number of channels that can be used by these is 448 channels.

A call route using the time division switch configured as described above will be explained with reference to FIG.

FIG. 3 shows a communication route between telephone A connected to the highway of the first switching element TSw1 and telephone B connected to the highway of the second switching element TSW. In addition, the housing area for telephone A is RHWA.
(receiving side) and sHwA (sending side).
Indicated by l (sending side).

The voice sent from the telephone A is encoded (converted to a digital signal) and converted from 2-wire to 4-wire in the line circuit LCA, and then transferred to the transmission side highway S) of the first switch element TSW.
A, receiving highway R of the first switch element TSw1
Hw7, link coupling line t2, second switch element TSW
The transmission side highway smv7 of 2, the second switch element TSW, and the reception side highway RHWB of the second switch element are input to the line circuit LCB of telephone B, where it is converted from 4-wire to 2-wire and decoded (converted to an analog signal), and then sent to the telephone. Reach B. Similarly, telephone B sends out voice 7'c "L".
CB-+S) 1wB-+RHw7→t, →SHw7→R
I(wA-+LCA→A) to reach telephone A.

The channels specified on each highway in the above call route are the same for the sending side and the receiving side (for example, RHwA and S), but the same channel is specified for the sending and receiving sides (for example, RHwA and S), but different is optional.

Note that this channel designation is the same in the embodiments shown in FIGS. 2 and 4.

Next, the embodiment shown in FIG. 2 will be explained. In this embodiment, channel goo (CG, , cc2) for specifying a channel to be used as a link is added to the link connection line t1 + t2 of the embodiment shown in FIG. 1. It was established. That is, for example, depending on the channel designation information sent from the central control device of the exchange, the corresponding channel (CG)
I*CG2 becomes conductive, and the switch element TSW is turned on every time the channel designation information arrives.

A communication path between TSW2 is formed.

In the embodiment shown in FIG. 2, channels other than the channels designated by the channel designation information (hereinafter referred to as link channels) can be used as normal communication channels. Therefore, for example, if 10 link channels are used, the other 22 channels can be used as communication channels, which is convenient for saving channels when many link channels are not required due to the traffic volume of an exchange or the like.

In the embodiment shown in FIG. 2, the link channel designation method using the channel designation information is a fixed designation method, and a relay call (in this case, a call spanning between switch elements 'I'SW1*TSW2). ), but if you take the latter method, for example, on a highway where some of the channels are used as the link channel, all channels are designated as communication channels. If relay calls are used, it becomes impossible to connect relay calls, so to prevent this from occurring, set the maximum number of channels that can be used as communication channels (or the maximum number of channels that can be used as link channels) during the It is necessary to set the minimum number of channels that can be used. In addition, in this case, there is a high probability that the equipment connected to the highway will be busy, but the equipment may be used for equipment that generates a small number of calls, such as telephone equipment maintenance or testing equipment. Once selected, there will be no problem in operation.

The call path in the time division switch shown in FIG. 2 can be easily understood from the explanation of FIG. 3, so it will not be explained again here.

The above embodiments are all examples in which the number of switch elements is two, but if a larger number of channels is required, the switch elements can be linked together one after another as shown in FIG. 4, for example. Bye.

(Effects of the present invention) As is clear from the above explanation, according to the present invention, the number of channels can be expanded very easily by using general-purpose switching elements, and the present invention has extremely large effects. .

[Brief explanation of drawings]

The drawings all show embodiments of the present invention; FIG.
2 and 4 are block diagrams of the embodiment, respectively.
The figure is a block diagram illustrating a call route in an embodiment. (King symbol) TSWl r TSW2 + TSW3...Time division switch element, 5HW6 w 5HW7 r 5HWA*
5HWB-Sender Highway, RI]'Wo-RI(
W7. RHWA, R) 1w8...Receiving side 1 way, /-1+Z2...Link connection line, CG, , CG2...Channel gate. Figure 1 ・ Figure 2 Procedural amendment dated 7177, Showa 10, Showa u in hand Relationship with Application No. 1/7772, f'1 Applicant 4, Agent Address: 2-6-2 Marunouchi, Chiyoda-ku, Tokyo Shigesu Building 330 in the number round
--Amendment The following matters in the specification of the application will be amended. Note 1, page 4, line 13, "number of links" is corrected to "number of highways."

Claims (1)

[Claims] 1. A time-division switch in which some highways of each of a plurality of time-division switch elements are cross-connected such that one transmission highway is connected to the other reception highway. How to expand your channel. 2. Some of the highways of each of the plurality of time division switch elements are connected in a cross-like manner such that one transmitting highway is mutually connected to the other receiving highway, and the highways are connected in a cross-connected path. A channel expansion method for a time division switch that provides a no-channel group to specify the channel to be used as a link.