JP3047564B2 - Digital subscriber line carrier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a digital subscriber line carrier apparatus of the 方式 gain system. In particular, the present invention relates to a method for setting a PCM signal clock signal and a DDS channel data clock signal of a digital subscriber line carrier having a digital data service (DDS) channel.

[0002]

2. Description of the Related Art FIG. 2 is a detailed block diagram of a conventional digital subscriber line carrier. FIG. 3 is an overall view of a digital subscriber line carrier.

Conventionally, as shown in FIGS. 2 and 3, a digital subscriber line carrier has a COT installed in a central office.
(Central Office Terminal) 1, connected to COT1, RT (remote terminal) 2 installed on the subscriber side, PCM (pulse code modulation) signal and DDS (Digital Data Service) channel of COT1 and RT2 A command input terminal 3 for performing clock setting for the PCT, a data link transmission unit 17 for the COT 1 for transmitting a PCM signal and clock setting information for the DDS channel to the RT 2 via the COT 1, and a PCM signal and the DDS channel from the COT 1. The data link receiving unit 21 of RT2 that receives the clock setting information of the COT1 and the clock setting information of the DDS channel from the command input terminal 3
The clock selection control unit 14 of the COT 1 that transfers the clock setting circuit 15 and the DDS channel clock setting circuit 16, and the PCM signal of the RT 2 and the clock setting information of the DDS channel from the data link receiving unit 21 of the RT 2 are respectively set to the PCM clock of the RT 2. Circuit 23
And a clock selection control unit 22 of RT2 to be transferred to the DDS channel clock setting circuit 24;
The PCM clock setting circuit 15 of the COT1 for setting the clock of the PCM signal of the COT1, the DDS channel clock setting circuit 16 of the COT1 for setting the clock of the DDS channel of the COT1, and the PCM clock setting of the RT2 for setting the clock of the PCM signal of the RT2 The circuit 23 and the D of RT2
And a DDS channel clock setting circuit 24 of RT2 for setting the clock of the DS channel.

[0004]

However, in such a conventional digital subscriber line carrier, when the clock selection control unit 14 of the COT1 and the clock selection control unit 22 of the RT2 are viewed from the command input terminal 3, PCs of COT1 and RT2
It is necessary to separately set clocks for the M signal and the DDS channel, and the operation of the command input terminal 3 is troublesome.
In addition, since the relationship between the PCM signal of the COT1 and the clock setting of the DDS channel and the relationship between the PCM signal of the RT2 and the clock setting of the DDS channel are not monitored, incorrect clock setting is performed and a data error occurs. There was a potential problem.

The present invention solves the above problems,
The clock setting of the PCM signal and the clock setting of the digital data service channel of the central office terminal and the remote terminal can be performed at the same time, and the possibility of executing an incorrect clock setting that causes a data error can be eliminated. It is an object to provide a digital subscriber line carrier.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a central office terminal at a central office, a remote terminal connected to the central office terminal, and a subscriber.
A command input terminal connected to the central office terminal for setting clocks of PCM signals and digital data service channels of the two terminals; the central office terminal transmits clock setting information of the remote terminal to be input to the remote terminal. In a digital subscriber line carrier including a transmitting unit for transmitting, and setting means for setting the two clocks based on the clock setting information of the central office terminal to be input, the central office terminal comprises two of the two terminals. A storage unit for storing clock setting information; a table indicating a relationship between the two clock setting information of the two terminals without causing a failure in the two terminals; Control means for determining whether or not to execute the clock setting information based on the contents of the storage means and the table, and providing the clock setting information of the two terminals based on the determination result. I do.

[0007]

The central office terminal stores two clock setting information of the two terminals in the storage means,
A table is provided that indicates the relationship between two pieces of clock setting information of two terminals that do not cause a failure in the two terminals. The control means determines whether the clock setting information should be executed based on the contents of the table and the clock setting information from the command input terminal, and gives the clock setting information of the two terminals to the two terminals based on the determination result. .

As described above, the clock setting of the PCM signal and the clock setting of the digital data service channel for the central office terminal and the remote terminal can be performed simultaneously, and there is a possibility that an erroneous clock setting that causes a data error is executed. Can be eliminated.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a detailed block diagram of a digital subscriber line carrier according to an embodiment of the present invention.

In FIG. 1, a digital subscriber line carrier is a central office terminal on the office side which is a CO.
T1; RT2 connected to COT1 as a remote terminal on the subscriber side; and a command input terminal 3 connected to COT1 for setting PCM signals of these two terminals and clock setting of a digital data service channel. A data link transmission unit 17 as a transmission unit for transmitting clock setting information of a remote terminal to be transmitted to RT2; a clock selection control unit 14 as setting means for performing the above two clock settings based on the input clock setting information of COT1; Circuit 15 and DDS channel clock setting circuit 16
Here, the feature of the present invention is that COT1
Is a system clock setting information storage unit 12 as storage means for storing the two clock setting information of the two terminals, and the two clock setting information of the two terminals in which no failure occurs in the two terminals. A clock setting table from the command input terminal 3 and whether to execute the clock setting information based on the contents of the system clock setting information storage unit 12 and the system clock setting table 13. And a system clock control unit 11 as control means for providing the clock setting information of the two terminals based on the determination result.

The operation of the digital subscriber line carrier having such a configuration will be described.

In FIG. 1, the command input terminal 3 sends C
When a clock setting change command of the PCM signals of the OT1 and RT2 or a clock setting change command of the DDS channel is input, the command information is sent to the system clock control unit 11, and the system clock control unit 11 stores the system clock setting information storage. Current COT1 from part 12
The clock setting information of the PCM signal and the DDS channel clock setting information of RT2 and RT2 are called. The system clock control unit 11 predicts the clock setting state of the newly set COT1 and RT2 based on the command information from the command input terminal 3, and determines whether a data error occurs in this clock setting state. Is determined by referring to the system clock setting table 13. As a result, when it is determined that the data error does not occur, the system clock control unit 11 generates a clock setting command of the PCM signal of the COT1 and the RT2 and a DDS channel clock setting command based on the command information from the command input terminal 3, The command information is simultaneously transmitted to the clock selection control unit 14 of the COT1.
Is transmitted to the clock selection control unit 22 of RT2 via the data link transmission unit 17 of COT1 and the data link reception unit 21 of RT2. When the system clock control unit 11 determines that the clock setting state of COT1 and RT2 newly set by the command information from the command input terminal 3 causes a data error, the system clock control unit 11 The fact that a data error occurs due to the command information from the terminal 3 is returned to the command input terminal 3 as response information.

[0013]

As described above, the present invention provides a PC for a central office terminal and a remote terminal.
There is an excellent effect that the clock setting of the M signal and the clock setting of the digital data service channel can be performed at the same time, and the possibility of executing an incorrect clock setting that causes a data error can be eliminated.

[Brief description of the drawings]

FIG. 1 is a detailed block diagram of a digital subscriber line carrier according to an embodiment of the present invention.

FIG. 2 is a detailed block diagram of a conventional digital subscriber line carrier.

FIG. 3 is an overall view of a digital subscriber line carrier.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 COT (Central Office Terminal) 2 RT (Remote Terminal) 3 Command input terminal 11 System clock control unit 12 System clock setting information storage unit 13 System clock setting table 14 Clock selection control unit 15 PCM clock setting circuit 16 DDS channel clock setting circuit 17 Data Link Transmitter 21 Data Link Receiver 22 Clock Selection Controller 23 PCM Clock Setting Circuit 24 DDS Channel Clock Setting Circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04J 3/00-3/26 H04L 7/00 H04Q 11/00-11/04 305

Claims (1)

(57) [Claims] 1. Central office terminal on the office side, remote terminal on the subscriber side connected to the central office terminal, and clock setting of PCM signal and digital data service channel of the two terminals connected to the central office terminal. The central office terminal transmits a clock setting information of the remote terminal to be input to the remote terminal, and the two clock settings based on the input clock setting information of the central office terminal. The central office terminal comprises: storage means for storing two clock setting information of the two terminals; and A table indicating the relationship between the two clock setting information sets of the two terminals that do not cause a failure in the terminal, and the clock setting information from the command input terminal based on the contents of the storage means and the table. Control means for judging whether or not to execute the information, and providing the clock setting information of the two terminals according to the judgment result.