JPH07107054A - Preassigned information input system for dcme device - Google Patents

Abstract

PURPOSE:To efficiently perform the input processing of preassigned information with less errors by inserting the preassigned information in an idle bit of the transmission bearer signals of a central station, extracting it in respective slave stations and automatically performing the input processing. CONSTITUTION:In the central station 1, the preassigned information 104 is inputted to a signal conversion circuit 12, synchronizing signals are added there and preassigned signals are obtained. The preassigned signals are inserted to the idle bit of the data word of the final column DCME frame of DCME multiple frames constituting the bearer signals by an insertion circuit 11 and transmitted to the respective slave stations. In the slave station 2, the preassigned signals are extracted by an extraction circuit 21 and the preassigned information is decoded by a signal decoding circuit 22 and automatically inputted to an OMC.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a DSI (digital voice insertion) technique and a variable bit type ADPCM (adaptive differential P).
DCM for improving line utilization efficiency by using CM technology
Regarding the E equipment (digital signal multiplexing equipment), in particular, the satellite channel addressed to the local station in the slave station of the DCME equipment in the multi-destination mode, which is formed by connecting the central station and up to four slave stations by satellite lines or submarine cables. Input method of pre-assignment information required for selection of

[0002]

2. Description of the Related Art A DCME device of this type is a PCM1 in which 30 channels are time-division-multiplexed with a channel in which amplitude information is encoded in 8 bits from a switch side (trunk interface).
Input up to 10 next-group signals (2,048 Mbit / s), first select only channels to be actually used and rearrange them, and then extract only the voiced time zone of each channel to the transmitting side. The DSI function for inserting and the variable bit type ADPCM function for converting the 8-bit PCM code into 5, 4 or 3-bit PCM code depending on the type of traffic (voice or data, etc.), the input signal transmission band is 4
It is compressed to ⅕ and transmitted as one bearer signal to the transmission path side (bearer interface). In addition, the bearer signal received from the transmission line side is reversed in the reverse process of the transmission side.
It is decoded into a PCM primary group signal of the book.

DCM in multi-destination mode
The E unit has a maximum of four slave stations arranged radially around the central office, and a radial line centered around the central office is constructed. Therefore, the central station has one transmission bearer, but the maximum number of reception bearers is four for each slave station.

The 8-bit coded channel input from the exchange side is called a telescopic channel (TC). First, the channel actually used is selected and the number of channels is compressed. This selected channel is called an international channel (IC). Then DSI
Thus, an IC carrying traffic is selected from among the ICs, and discrimination is made as to whether the traffic is voice or data. Based on this result, the ADPCM CODER having the optimum number of coding bits is assigned and coded. Then, the satellite channel (SC) is connected to the satellite channel (SC) arranged in the transmission bearer.

ADPCM CODER is based on CCITT Recommendation G.264. 723-compliant 3 to 5 bit variable length ADPC
In M CODER, normally 4 bits are allocated to a voice signal or a calling signal and 5 bits are allocated to data, but the voice is dropped to 3 bits when the traffic is busy. The relationship between the IC number and the SC number is sent to the slave stations by assignment channels (AC) arranged in the transmission bearer signals one by one.
The SC addressed to itself is selected by the C message and the preassign information.

The pre-assignment information indicates information such as bit length for each of all satellite channels transmitted from the central station, and is pre-arranged and set between the opposing stations. It is input via the operator from the operating maintenance center (OMC) that performs maintenance.

FIG. 1 is a system configuration diagram of a general multi-destination mode DCME device, which is an example of a configuration of a central station 1 and two slave stations 2 and 3. From the central station 1, Trunk 1 (IC1 to 30) addressed to slave station 1 and T addressed to slave station 2
rank2 (IC31-60) is simultaneously transmitted to the slave stations 2 and 3 by one bearer signal 101. Since the slave stations 2 and 3 receive the bearer signal 101 and the IC has been converted into the SC, the SC addressed to the self station is selected and I is selected.
C1-30 and IC31-60 are decoded and output. The transmissions from the slave stations 2 and 3 are carried out by the bearers 102 and 103, respectively, and the transmission SCs from the slave stations are put on the bearers 102 and 103, respectively. The central office receives the signals by individual receiving circuits.

FIG. 2 is a block diagram showing the frame structure of the bearer signal 101 of FIG. 2A shows the basic frame “Frame”, and FIG. 2B shows the basic frame 16
"DCME Frame", which is a multi-frame
FIG. 2C shows “DCME Multi Frame” in which 64 pieces of “DCME Frame” are multi-framed.
Are shown respectively.

"Frame" in FIG. 2A has a period of 12
Convenient 25 for 32 8-bit time slots in 5 μs
PCM primary group signal (2,048bi) in which 6 bits are arranged
t / s). The first 8 bits transmit a multi-frame sync bit pattern in a TSO slot, the next 4 bits are an AC slot, the MSB 1 bit is for synchronization, and the remaining 3 bits are information indicating the relationship between the IC number and the SC number. Etc. The AC message necessary for decoding the original channel on the receiving station side is transmitted. From the next slot onward, 61 SCs of SC1 to 61 are transmitted in 4-bit divided slots. However, in the case of audio 3-bit coding, the maximum is SC1 to SC81 and the maximum is 81 SC. Figure 2 shows the TSO and AC slots
It is used in the multi-frame configuration shown in (b) and (c).

FIG. 3 is a block diagram showing an actual operation example of the SC slot in FIG. 2 (a). In FIG. 3A, the slot SC1 is a bit bank (BB), SC2 is a 5-bit IC1, SC3 is a 5-bit IC2, SC4.
Is 5-bit IC31, D5 is DSI CH after SC5
An IC, which is determined by any of 8, 5, 4, and 3 bits, is connected depending on the identification result of the SI input signal.
Is automatically determined in the DCME device.

Since the SC slot has 4 bits, a 1-bit surplus is left when a 5-bit IC is arranged, and the 1-bit is sequentially accommodated in the slot BB. FIG. 3B shows the structure of this slot BB.

The bit arrangement of each SC slot, that is, in which slot BB, 5-bit pre-assignment, 4-bit pre-assignment or the like is placed, is preset by the pre-assignment information as described above.
When decoding the 5-bit pre-assignment from the SC in each slave station, the extra 1 bit contained in the slot BB must be extracted and added. In this extraction, it is necessary to know at which position in the BB the extra 1 bit to be extracted is accommodated, and therefore pre-assign information of all slave stations including other slave stations is required.

[0013]

As described above, in the conventional pre-assignment information input method, all pre-assignment information including the information of other slave stations is input from the OMC through the operator for each slave station. The pre-sign information is set in advance with the central station as the center according to the channel plan. Therefore, it is troublesome for each slave station to obtain the data for other slave stations and input manually, and there is a problem that an error is likely to occur. Especially, since the pre-assignment information is changed along with the change of the channel plan, the degree of setting change is large and this problem becomes important.

[0014]

According to the pre-assignment information input method of the present invention, the slave station of the multi-destination mode DCME device is constructed by connecting a central station and a maximum of four slave stations by satellite lines or submarine cables. In the input method of the pre-assignment information necessary for receiving the bearer signal from the central station and selecting the satellite channel addressed to the own station from the satellite channels arranged in the bearer signal, the pre-assignment information is the The central station inserts into the empty bit of the bearer signal and transmits it, and the slave station receives the bearer signal, extracts the pre-assignment information, and automatically inputs it to the receiving unit of its own station.

The empty bits of the bearer signal use the spare 4 bits of the data word of the DCME frame in the last column of the DCME multiframe forming the bearer signal.

[0016]

Embodiments of the present invention will now be described with reference to the drawings.

In the frame structure of the DCME device described above with reference to FIGS. 1 to 3, the AC slot transmits an AC message in a multiframe. The structure of this AC multiframe is as shown in FIG. FIG. 4A shows DCME.
FIG. 4B is a block diagram showing the arrangement of the entire Frame AC multi-frame, and FIG. 4B is a block diagram showing the arrangement of the INFO BITS portion in this.

The INFO BITS is the correspondence information between the IC number and the SC number necessary for selecting the SC addressed to itself from the received bearer signal in the slave station and decoding the IC, the background noise level information on the transmitting side, and the alarm information. Signal is transmitted. DATA WO at the end of this INFO BITS
4 bits of RD ASYNC are multi-frame DCM
E Multi Frame's DCME Frame
At 63, it is an empty bit.

In this embodiment, the empty bit is used to transmit the pre-assign information, and the bit arrangement is as shown in FIG. FIG. 5 is a block diagram showing the bit arrangement of the pre-assign signal. The first 1 bit of the 4 bits is a sync signal, and the remaining 3 bits are preassign information.
In the 3-bit pre-assignment information, for example, 000 is B
B, 010 is 5-bit SC, 111 is DSI CH
(8, 5, 4, 3 bits SC). This pre-assign signal is DCME Multi Frame0
SC1's, DCME Multi Frame1
Then, the data of SC2 and that of SC2 are sequentially transmitted in the order of SC numbers by multiframe.

FIG. 6 is a block diagram showing a transmission / reception circuit for pre-assign information. The pre-assignment information about all slave stations set between the central station 1 and each slave station is transmitted to the signal converting circuit 1 as the transmission pre-assign information 104 in the central station 1.
2 and the sync signal is added here to form the pre-assign signal shown in FIG. This pre-assign signal is input to the inserting circuit 11, is inserted into the empty bit of the AC multi-frame described here with reference to FIG. 4, and is transmitted to each slave station by the bearer signal 101.

In the slave station 2, the pre-assigned signal is extracted from the bearer signal 101 received by the extraction circuit 21 and input to the signal decoding circuit 22. Signal decoding circuit 2
In No. 2, the pre-assign information is decoded by the synchronization signal on the transmitting side, but at this time, it is decoded while being matched with the input signal format on the OMC side. The pre-sign information is stored in the memory of the OMC, and the bearer signal 101 is stored in the SC receiver.
Used to select the SC addressed to itself. The pre-sign information only needs to be input initially, but if there is a change in the channel plan between the central station and the slave stations, it will be changed accordingly, so it is often updated. The slave station 3 has the same configuration as described above.

[0022]

As described above, according to the present invention, the pre-assignment information of all slave stations generated in the central station is inserted into the empty bit of the transmission bearer signal of the central station and transmitted to each slave station. Is extracted and processed automatically, so
There is an effect that the initial input process of the pre-sign information and the update input process that occurs when the channel plan is changed are efficient and the number of errors is reduced.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a DCME device.

2A and 2B show a bearer frame structure in FIG. 1A is a basic frame, and FIG. 2B is a DCME frame.
(C) is a block diagram which shows DCME Multi Frame.

3A and 3B show an actual arrangement example of FIG. 2A, FIG. 3A is an overall frame, and FIG. 3B is a configuration diagram showing an arrangement of a slot BB portion.

4A shows a multi-frame of the AC slot of FIG. 2A, FIG. 4A shows an entire frame, and FIG. 4B shows INFO BI.
It is a block diagram which shows arrangement | positioning of a TS part.

FIG. 5 is a configuration diagram showing a bit arrangement of a pre-assign signal of the present embodiment.

FIG. 6 is a block diagram showing a transmission / reception circuit for preassigned information according to the present embodiment.

[Explanation of symbols]

 1 Central Station 2, 3 Slave Station 11 Insertion Circuit 12 Signal Conversion Circuit 21 Extraction Circuit 22 Signal Decoding Circuit 101, 102, 103 Bearer Signal

Claims (2)

[Claims] 1. A slave station of a multi-destination mode DCME device comprising a central station and a maximum of four slave stations connected by a satellite line or a submarine cable, receives the bearer signal from the central station, and receives the bearer signal. In the input method of the pre-assignment information required to select the satellite channel addressed to the own station from among the satellite channels arranged in, the pre-assignment information is inserted into the empty bit of the bearer signal at the central station and transmitted. The slave station receives the bearer signal, extracts the pre-assignment information from the bearer signal, and automatically inputs the pre-assignment information to the receiving unit of the local station. 2. The empty bit of the bearer signal is the last column D of the DCME multiframe that constitutes the bearer signal.
The pre-assign information input method of the DCME device according to claim 1, wherein 4 spare bits of a data word of the CME frame are used.