JPH0697760B2 - PCM terminal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A PCM system having a channel section to which data is to be transmitted by a pulse synchronized with a channel section selection signal when a switch for cross-connecting the channel section of each PCM system is provided between the systems. An alarm processing unit that sends an alarm signal to the alarm bus and an alarm detection unit that detects the alarm signal by the channel selection signal are provided in each channel unit, and the alarm signal is output to the desired channel unit even when cross connection is made. It is designed to be transmitted.

[Industrial application field]

The present invention is a PCM terminal in the case where a switch for cross-connecting the channel part of each system (DS0 switch for cross-connecting at a 64 Kbps level) is provided in a PCM terminal device that accommodates a plurality of PCM systems (24CH). Regarding improvement of station equipment.

Recently, in a PCM terminal equipment that accommodates multiple PCM systems (24CH), a DS0 switch is provided between the channel and the multiplexing section to cross-connect the channel (hereinafter referred to as CH) section. There is a desire to have a cross-connect to.

When this demand is satisfied, it is necessary that the alarm signal from the multiplexing unit can also be transmitted to the desired channel unit.

[Conventional technology]

 FIG. 4 is a block diagram of a conventional PCM terminal station device.

In the figure, 1 and 4 are the CH1 parts of groups 1 and 2, respectively, and 2 and 5 are the groups.
CH2 section of 1 and 2; CH6 section of groups 1 and 2 respectively; 3 and 6, 7 and 8 multiplexing section, 9 alarm processing section, 10 own CH signal detection section, 11
Is a DS0 switch, 20 and 21 are data buses, 22 and 23 are alarm buses, and CHP1, CHP2, CHP24, CHP1 ', CHP2', and CHP24 'are channel selection signals.

FIG. 4 shows an example of a PCM terminal device in the case of accommodating 24 channels and 2 systems. Since each CH section has the same configuration as that of CH section 1 of CH1, the inside is not shown.

Taking the side of the multiplexing unit 7 as an example, the data from the multiplexing unit 7 receives data from the CH1 unit 1 and CH2 of the group via the data bus 20.
CH2, CH24 CH3, CH2 CH3, CH2 CH3 CH2, CH24 CH3 CH2 CH3 CH2
When 2, CHP24 is detected by the own CH signal detection unit 10, data for own CH is fetched.

The alarm signal from the multiplexing unit 7 is sent to each CH unit via the alarm bus 22 and processed by the alarm processing unit 9 of each CH unit.

The above operation is the same on the multiplexing unit 8 side.

Here, the DS0 switch 11 is provided, and the CH section of a different system,
For example, when trying to cross-connect the CH2 unit 2 of the group 1 and the CH2 unit 5 of the group 2, the data is once stored, the data for the CH2 unit 2 of the group 1 is sent to the data bus 21, and the CH unit of the group 2 is sent. Data for 5 is sent to the data bus 20.

[Problems to be solved by the invention]

However, since the alarm signal is, for example, one level continuous and is not divided for each CH, the alarm signal from the multiplexing unit 7 is sent out via the alarm bus 22 and should be sent to the CH2 unit 5 of the group 2 in the group 1. Will be sent to CH2 section 2 of.

That is, when cross-connected, there is a problem that the alarm signal may not be sent to the CH part which should be sent, but may be sent to the CH part which should not be sent.

[Means for solving problems]

The above-mentioned problem is to accommodate a plurality of PCM systems that demultiplex and transmit PCM signals of a plurality of channels by a multiplexer, and channel data from the multiplexer of each PCM system is cross-connected between the PCM systems. Switch and each PCM
A channel section selection signal for selecting each channel data from the multiplexing section of each PCM system is transmitted to the channel section of each PCM system via the system data bus. PC with own channel signal detection unit that captures the input data when input, and a channel alarm processing unit that outputs the alarm signal when the alarm signal is sent via the alarm bus
In the M terminal equipment, the alarm signal and the channel selection signal from the multiplexing unit of each PCM system should be input to the switch, and the alarm signal should be cross-connected to the channel data.
The alarm bus of the PCM system is provided with an alarm processing unit for sending in a pulse synchronized with the channel selection signal corresponding to the data to be sent to the PCM system, and each channel of each PCM system has an alarm signal from the alarm bus. This is solved by the PCM terminal device of the present invention, which is provided with an alarm detection unit which inputs the channel selection signal, detects the alarm signal by the channel selection signal, and outputs an alarm signal from the channel alarm processing unit. .

[Action]

According to the present invention, an alarm signal is sent from the alarm processing unit to the alarm bus of a PCM system having a channel unit to which data should be sent, in a pulse synchronized with the channel selection signal, and the alarm detection unit in each CH unit Since the alarm signal is detected by the channel section selection signal, the alarm signal is transmitted to the CH section which should be sent and not transmitted to the CH section which should not be sent even if cross-connected.

〔Example〕

FIG. 1 is a block diagram of a PCM terminal station device of an embodiment of the present invention,
FIG. 2 is a time chart of waveforms of respective parts when cross connection is not performed in FIG. 1, and FIG. 3 is a time chart of waveforms of respective parts when cross connection is performed in FIG.
(A ') (B) (B') correspond to points a, a ', b, b' in FIG. 1, and (CHP1) (CHP2) (CHP24) are channel portion selection signals CHP1, Corresponding to CHP2, CHP24, (C1) (C2)
(C24) (C1 ') (C2') (C24 ') are CH11', C shown in Fig. 1.
It corresponds to the output of H22 ', CH243'CH14', CH25 ', CH246'.

In the figure, 1'and 4'are CH1 parts of groups 1 and 2 respectively, 2'and 5'are CH2 parts of groups 1 and 2 respectively, 3'and 3'are C of groups 1 and 2 respectively.
H24, 11 'is a DS0 switch, 12 is an alarm detector, 14 is a latch circuit, and 15 is an alarm processor, and the same reference numerals denote the same functions throughout the drawings.

1 differs from the case of FIG. 4 in that each CH section is provided with an alarm detection section 12 including a latch circuit 14 for latching an alarm signal and a channel section selection signal, and the DS0 switch 1
1'includes all the channel section selection signals, and the alarm signals by this and the alarm signals are sent to the alarm buses 22 and 23 of the group having the CH section to which the data should be sent by the pulse synchronized with the channel section selection signal. The point is that an alarm processing unit 15 for transmitting is provided.

When cross connection is not used, the second side will be taken by taking the multiplexing unit 7 side as an example.
The alarm signal transmission will be described with reference to the drawings. In a normal case, the 0 level signal shown in (A) is input to the alarm processing unit 15, and the alarm processing unit 15
A 0 level pulse synchronized with the channel section selection signal as shown in (B) is sent to the alarm bus 22 from the output with the 1 level channel section selection signal shown in (CHP1) (CHP2) (CHP24).

When an abnormality occurs, the alarm signal becomes 1 level as shown in (A), so it is set to 1 level as shown in (B).

In the CH section, the CH section 1'of CH1 will be described as an example. In the normal case, the signal from the alarm bus 22 is at 0 level when the channel section selection signal is transmitted as shown in (B), so the output is at 0 level. Then, this is latched by the latch circuit 14,
It is processed by the alarm processing unit 9, and the output becomes 0 level as shown in (C1).

When an abnormality occurs, the signal input from the alarm bus 22 becomes a 1-level signal as shown in (B), so (CHP1)
It is latched by the latch circuit 14 by the channel selection signal shown in, processed by the alarm signal 9, and the output is (C1).
It becomes 1 level as shown in.

Next, the CH2 unit 2'of the group 1 in the system of the multiplexing unit 7 and the CH2 unit 5'of the group 2 in the system of the multiplexing unit 8 are cross-connected, and an alarm signal is sent from the multiplexing unit 7. The case will be described as an example with reference to FIG.

If the alarm processing unit 15 is normal, similar to the above,
As shown in (B) and (B ') on the alarm buses 22 and 23,
Channel selection signal CHP1, CHP2, CHP24, CHP1'CHP2 ', C
Outputs 0 level pulse synchronized with HP24 '.

When an abnormality occurs, the portion corresponding to the CH2 portion 2'of the group 1 cross-connected to the alarm bus 22 by the 1 level signal shown in (A) is synchronized with the channel portion selection signal CHP2 as shown in (B). On the other hand, as shown in (B '), the portion corresponding to the CH2 portion 5'of the cross-connected group 2 outputs a 0 level pulse on the alarm bus 23 in synchronization with the channel portion selection signal CHP2'. Turn off output.

Therefore, since the CH2 unit 2'of the group 1 does not detect the alarm signal, the output is below the level as shown in (C2), and the CH2 unit 5'of the group 2 detects the alarm signal, so the output is (C2 ' ), The level becomes one.

That is, even if there is a cross connection, the alarm signal is transmitted to the CH section which should be sent and is not transmitted to the CH section which should not be sent.

〔The invention's effect〕

As described above in detail, according to the present invention, even if a DS0 switch is used and a cross connection is made, an alarm signal is transmitted to a CH section that should be sent and is not transmitted to a CH section that should not be sent. is there.

[Brief description of drawings]

FIG. 1 is a block diagram of a PCM terminal station device of an embodiment of the present invention, FIG. 2 is a time chart of waveforms of respective parts when cross connection is not performed in FIG. 1, and FIG. FIG. 4 is a block diagram of a conventional PCM terminal device, when the waveforms of the respective parts are connected. In the figure, 1,1 'is the CH1 part of group 1, 2,2' is the CH2 part of group 1, 3,3 'is the CH24 part of group 1, 4,4' is the CH1 part of group 2, 5,5 'Is CH2 part of group 2, 6,6' is CH2 part of group 2, 7,8 is multiplexing part, 9,15 is alarm processing part, 10 is own CH signal detection part, 11,11 'is DS0 switch , 12 is an alarm detector, 14 is a latch circuit, 20, 21 is a data bus, 22, 23 is an alarm bus, and CHP1, CHP2, CHP24, CHP1 ', CHP2', CHP24 'are channel selection signals.

Claims (1)

[Claims] 1. A plurality of PCM systems for demultiplexing and transmitting a plurality of PCM signals of a plurality of channels by a multiplexer, and
Channel data from the multiplexer of the CM system is sent to each PC
It is sent to the channel section of each PCM system via a switch cross-connecting between M systems and the data bus of each PCM system, and each channel section of each PCM system is supplied from the multiplexing section of each PCM system. Channel section that selects each channel data of the channel channel own signal detection section that captures the data to be input when the channel selection signal is input, and the channel alarm processing that outputs the alarm signal when the alarm signal is sent via the alarm bus PC with parts
In the M terminal equipment, the alarm signal and the channel selection signal from the multiplexing unit of each PCM system should be input to the switch, and the alarm signal should be cross-connected to the channel data.
The alarm bus of the PCM system is provided with an alarm processing unit for sending in a pulse synchronized with the channel selection signal corresponding to the data to be sent to the PCM system, and each channel of each PCM system has an alarm signal from the alarm bus. A PC provided with an alarm detection section for inputting the channel section selection signal, detecting the alarm signal by the channel section selection signal, and outputting an alarm signal from the channel alarm processing section
M terminal equipment.