JPS627760B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling subscriber circuits in a time-division concentrator, and particularly to a method for controlling subscriber circuits of two different types: a subscriber circuit for time-division concentrators and a subscriber circuit for space-division concentrators. This relates to subscriber circuit control systems that are controlled using the same control system.

FIG. 1 is a block diagram showing the configuration of a line concentrator to which the present invention is applied, in which SLC-A performs 2-wire/4-wire conversion, digital encoding, supply of communication current, subscriber monitoring, and transmission/reception of high amplitude signals. A time-division concentrator subscriber circuit, SLC-B, which is a first subscriber circuit equipped with a first functional unit having a first function such as A subscriber circuit combined with space division line concentration, HW0, HW1, which is a second subscriber circuit equipped with a second function unit having a second function consisting of a space division line concentration and a subscriber line scanning function in addition to the functional unit; HW2 is a time division transmission line, TSW is a time division concentrator switch, CONT is a common control circuit, and S is a subscriber telephone.

Since existing subscriber telephones have a configuration suitable for conventional analog exchanges, the interface with the subscriber telephones becomes an important issue when digitizing subscriber line exchanges. In other words, in analog exchanges, almost all subscriber interface functions such as supplying communication current, sending out ringing signals, and receiving dial pulses can be used economically by many subscribers at the end of the communication network. We were able to achieve this goal. However, in a digital exchange, the subscriber interface signal as described above cannot pass through a time division switch, so it is necessary to implement it in a subscriber circuit provided for each subscriber. In addition, in order to exchange low-amplitude AC signals such as voice signals sent and received between subscriber telephones and exchanges using time division switches, digital encoding, 2
Line/4-wire switching functionality is required for each subscriber circuit.

As described above, in digital exchanges, the functions of the subscriber circuits become more complex and sophisticated, so they are less economical than analog exchanges, especially when the subscriber call rate is low and the usage rate of the subscriber circuits is small. It will be inferior.

Figure 1 shows that in order to eliminate the drawbacks of the digital switching system described above, subscribers with a low call rate can use a space-division concentrator combined subscriber circuit SLC equipped with a space-division concentrator function.
- It is intended to be accommodated in B to make it more economical. on the other hand,
High call rate subscribers are accommodated in the time-division concentration subscriber circuit SLC-A, which is not provided with a space-division concentration function.

The feature of FIG. 1 is that the subscriber circuit for time-division concentration
SLC-A and space division concentrator combined subscriber circuit SLC
-B, two types of subscriber circuits are housed in the same time division concentrator switch TSW. However, in addition to the first function of the time-division concentrator SLC-A, the space-division concentrator SLC-B has a second function unique to the space-division concentrator, and both subscribers The circuits SLC-A and SLC-B have different functions. Furthermore, in SLC-B that uses space division and line concentration, by selectively driving the fork points of the space division and line concentration switch to change the connection of the first functional section,
It is configured to be shared by many subscribers. That is, the circuit number of the first functional unit and the subscriber number do not correspond one-to-one. In this way, both subscriber circuits SLC-A and SLC-B shown in FIG.
In a digital exchange configured to connect two types of subscriber circuits to the same time division concentrator switch TSW, both subscriber circuits SLC-A and
A drawback was that it was difficult to control SLC-B with the same common control circuit.

In order to solve these drawbacks, the present invention is characterized in that the above-mentioned two different types of subscriber circuits are controlled by the same control method, and the control circuit is shared by the two types of subscriber circuits. The purpose is to provide a subscriber circuit control system that can economically provide services not only to high call rate subscribers but also to low call rate subscribers.

FIG. 2 shows one embodiment of the present invention, which is the same as FIG. 1. In Figure 2, S(i){i
=1~(m+n)} is the subscriber telephone, L(i) {i=
1~(m+n)} are subscriber lines, SLC-A1~
SLC-Am is a subscriber circuit for time division line concentration, SLC-B
11~SLC-B1n, SLC-B21~SLC-B2
k is a space division concentrator combined subscriber circuit, CON-A1
~CON-Am, CON-B11~CON-B1n,
CON-B21 to CON-B2k are subscriber circuit control circuits, LS1 to LS2 are subscriber line scanning circuits, S11
~Snk is a space division concentrator switch, HWO(i) {i=
1 to (m+n)} are time division transmission lines. LS1,
S11 to S1k make SLC-B11, LSk,
SLC-B1k by Sk1~Skk, LSn, Sn1~
Configure SLC-B1n with Snk, CON-A1~
CON-Am corresponds to SLC-A1 to SLC-Am, and CON-B11 to CON-B1n correspond to SLC
- corresponding to B11 to SLC-B1n, and CON-B21 to CON-B2k correspond to SLC-B21
~ Provided correspondingly to SLC-B2k, HW0
(1) ~ HW0 (m) is CON-A1 ~ CON-Am,
HW0(m+1) ~ HW0(m+k) is CON-B
11, CON-B21~CON-B1k and CON
-B2k and HW0(m+k+1)~HW0
(m+n) is CON-B1 (k+1) ~ CON-B1
Connect to n respectively. S11 to Snk are communication path networks having an incoming line n and an outgoing line k, and are configured so that n>k. LSM is subscriber line scan memory, TSM
is the subscriber monitoring memory, and basically the monitoring information of the empty subscriber is stored in the subscriber line scanning memory.
The subscriber monitoring information on the call status is stored in the subscriber monitoring memory TSM. Further, the subscriber line scanning memory LSM and the subscriber monitoring memory TSM constitute a common control circuit CONT.

FIG. 3 is a diagram showing how to allocate channels for time-division transmission lines HW0(i) and HW1, and shows how CH(i)
{i=1~2(m+n)} is the channel number, Sn(i)
{i=1 to (m+n)} is a subscriber number, V is a voice channel, and SN is a monitoring information channel. Each monitoring information channel SN has a time slot Ti.
(i=1 to l).

In Figure 3, CH(1) to CH {2(m+n)}
constitute one frame. CH(1)～CH(2m)
The SN channel accommodates the subscriber monitoring information output from the SLC-Ai corresponding to each of Sn(1) to Sn(m), and the V channel accommodates the respective audio signals. 2(m+k)} SN
The subscriber monitoring information output from the SLC-B1i and the subscriber monitoring information output from the SLC2i corresponding to Sn(m+1) to Sn(m+k) are stored in the channel, and the audio from the SLC-B2i is stored in the V channel. Accommodates the signal, CH{2(m+k)+1}~
The SN channel of CH{2(m+n)} has Sn(m+
corresponding to each of k+1) to Sn(m+n)
The subscriber monitoring information output from SLC-B1i is accommodated, and the V channel is left empty.

Next, the operation of this will be explained. In Figure 2,
The subscriber monitoring information output from the subscriber monitoring circuit (not shown) in the SLC-Ai is sent to the corresponding SN channel in Fig. 3 within the CON-Ai.
Sent as bits. That is, for example, the third
The same information is sent to T1 and T2 in the figure.

Note that SLC-Ai is publicly known (for example, in the Showa era
Proceedings of the 1954 National Conference of the Institute of Electronics and Communication Engineers, paper number 1726, Akiyama et al., "Functional Deployment of Digital LS Subscriber Circuits"), so a detailed explanation will be omitted, but SLC-
Generally, the same subscriber monitoring circuit in Ai is used both when the subscriber is idle and when the subscriber is on the phone.

Next, SLC-B1i will be explained. SLC―
The subscriber monitoring results output from the LSis (i=1 to n) in B1i are sent to the corresponding SN channels in FIG. 3 within CON-B1i. That is, it is sent to time slot T2 in FIG. Here, CON-B1i is configured to always send "0" to the T1 time slot of its corresponding SN channel, and "0" corresponds to the subscriber's on-hook state.

Next, SLC-B2i will be explained. SLC―
A subscriber monitoring circuit (not shown) in B2i is used to monitor subscribers during calls, and the subscriber monitoring results output from this circuit are sent to the corresponding SN channels in FIG. 3 within CON-B2i. be done.
That is, it is sent to time slot T1 in FIG.

Here, CON-B2i corresponds to each
The T2 time slot of the SN channel is configured to always send "0". Because of this configuration, as shown in Figure 2,
By ORing the respective outputs of CON-Ai, CON-B1i, and CON-B2i, the SN in Fig. 3 is obtained.
The T1 time slot of a channel can be configured to accommodate monitoring results for active subscribers, and the T2 time slot can be configured to accommodate monitoring results for idle subscribers.

In FIG. 2, the common control circuit CONT is connected to the subscriber monitoring memory TSM which is the first memory.
The time slot is configured to be stored after being focused by a time division concentration switch TSW, and the subscriber line scanning memory LSM, which is a second memory, stores the time slots.
It is configured to accumulate information for two time slots.

As explained above, according to the present invention, two-wire
4-wire conversion, digital encoding, communication current supply,
A time-division concentrating subscriber circuit that has functions such as subscriber monitoring and transmitting and receiving high-amplitude signals, and a space-division concentrating circuit that has space-division concentration and subscriber line scanning functions in addition to the functions of the time-division concentrator subscriber circuit. The concentrator subscriber circuit and the subscriber circuit can be controlled by a control circuit configured in the same manner, and services can be provided economically not only to high call rate subscribers but also to low call rate subscribers.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a line concentrator to which the present invention is applied, FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a diagram showing channel allocation of time-division transmission lines in the present invention. It is. S, S(i)...Subscriber telephone, SLC-A, SLC-
Ai...Subscriber circuit for time division line concentration, SLC-B, SLC
-B1i, SLC-B2i...Subscriber circuit with space division concentrator, HW0, HW1, HW2, HW0(i)...Time division transmission line, TSW...Time division concentration switch, CONT
...Common control circuit, L(i)...Subscriber line, CON-
Ai, CON-B1i, CON-B2i...Subscriber circuit control circuit, LSi...Subscriber line scanning circuit, S11~
Snk...Space division line concentration switch, LSM...Subscriber line scanning memory, TSM...Subscriber monitoring memory.

Claims (1)

[Claims] 1. A first subscriber circuit equipped with a first functional unit having first functions such as 2-wire/4-wire conversion, digital encoding, supply of communication current, subscriber monitoring, and transmission/reception of high amplitude signals; A second subscriber circuit equipped with a second functional unit having a second function consisting of space division concentrating and subscriber line scanning in addition to the first functional unit is connected to the same time division concentrating switch. In a line concentrator for concentrating low traffic calls, a common control circuit commonly controls the first subscriber circuit and the second subscriber circuit, and the first subscriber circuit and the second subscriber circuit A time-division transmission line is provided to connect the channels, and the channels of the time-division transmission line are allocated in correspondence with subscriber numbers, and the first subscriber monitoring information output from the first subscriber circuit contains the same information. The two bits in the first bit position and the second bit position are accommodated in the channel of the corresponding subscriber number together with the voice signal, and the first bit in the second subscriber circuit is
The second subscriber monitoring information output from the functional section of
A voice signal is accommodated in the channel of a predetermined subscriber number at the same bit position as the first bit position, and the second subscriber circuit of the second subscriber circuit is accommodated.
The third subscriber monitoring information outputted from the functional unit is stored in the channel of the corresponding subscriber number with the same bit position as the second bit position, and the subscriber monitoring information is transmitted. a first memory and a second memory for accumulating subscriber monitoring information on the time-division transmission path, and the subscriber monitoring information at the first bit position on the time-division transmission path is converged by the time-division concentrator switch; A subscriber circuit control system characterized in that subscriber monitoring information stored in the first memory and located in the second bit position is stored in the second memory.