JPS63316532A - Drop inserting repeater system - Google Patents

Abstract

PURPOSE:To efficiently branch or insert only a special signal out of multiple signals by being equipped with a device to make clock information toothless, an (n) frequency divider and a device to directly branch and insert a special channel only from a transmitting signal. CONSTITUTION:A receiver 101 outputs a light signal, etc., inputted from a transmission line as a data signal 11 and a clock signal 12. The signal 12 drives an (n) frequency divider 103 through a gate 102, an (n) frequency divided clock operates a D-type FF104, branches any one channel out of (n) channels and sends it to a synchronizing circuit 105. The circuit 105 investigates whether or not this is a desired channel, and when it is wrong, issues the channel shifting request. A mono-multi vibrator 106 generates the pulse for one bit of a transmitting signal and makes the clock of the output of the gate 102 toothless. On the other hand, the insertion of the data is executed by a selector 107 and a mono-multi vibrator 108. The output signal of a selector 107 is sent to a transmission line by a transmitter 110.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for adding/dropping transmission signals at a repeater in a transmission line such as an optical fiber cable. This relates to a method of accessing only channels.

BACKGROUND OF THE INVENTION Conventionally, an example of this type of drop-insert repeater system, as shown in FIG. 2, includes a receiver 201 that separates an input signal from a transmission line into data and clock signals, and a demultiplexing circuit 202 that returns n original signals;
Switch 20 for switching the separated signal to a predetermined position
3, a synchronization circuit 204 that synchronizes a specific channel, a selector 205 that selects data, a multiplexing circuit 206 that synchronously multiplexes n signals, and a transmission path for transmitting the multiplexed data signal and clock signal. Transmitter 2 outputs to
It consisted of 07.

Therefore, in the conventional drop insert method described above, the receiver 201 and the transmitter 207 are connected by n original signal lines, which inevitably increases the size of the hardware configuration. A repeater in which the receiver 201 and the transmitter 207 are not integrated has the disadvantage that there is a limit to the number of n. Furthermore, when the number of multiplexed transmission signals changes, almost all the hardware has to be changed.

Problems to be Solved by the Invention The purpose of the present invention is to solve the above-mentioned drawbacks, namely, that the receiver and the transmitter must be connected by n original signal lines used for multiplexing. It is an object of the present invention to provide a drop-insert relay system which solves the problem that most of the equipment must be changed when the system is enlarged and the number of multiplexes n changes.

Means for Solving the Problems: A receiver, a transmitter, and a synchronization circuit in the circuit, a means for making the synchronization signal from the synchronization circuit sharp, and an n frequency divider whose phase is controlled by the output and the clock. The system employs a configuration that includes means for branching data of a specific channel or inserting new data using the synchronized clock of the channel.

Operation Since the present invention is constructed as described above, the receiver separates the input signal from the transmission line into a data signal and a clock signal, and the clock signal is divided into the n frequency divider by the signal cut out from the synchronization circuit. By controlling the phase, data of a specific channel can be branched using the synchronous clock of the n frequency divider, or new data can be inserted.

Example Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, which shows a block circuit diagram of an embodiment of the present invention, the drop-insert relay circuit of the present invention includes a conventional receiver 101, a transmitter 110, a synchronization circuit 105, and a new one. A mono multi 106 that makes the synchronization signal from the synchronization circuit 105 sharp, and this mono multi 10
6 and the clock signal 12 separated by the receiver 101
11 frequency divider 103 whose phase is controlled by this output, and D which branches a specific channel from the data signal separated by the receiver 101 using the output of this n frequency divider 103 as a clock. type flip-flop 104 and selector 1 for inserting new data
07, a monomulti 108, and an insertion means consisting of a gate 109.

Next, the operation of this embodiment will be explained using FIG.

First, the receiver 101 receives optical signals inputted through the transmission path as a data (DATA) signal 11 and a clock (CLK).
Output as signal 12. Clock signal 12 is gate 1
02 to drive the n frequency divider 103. The n-divided clock operates the D-type flip-flop 104, branches one of the n channels, and sends it to the synchronization circuit 105. The synchronization circuit 105 checks whether this is the desired channel or not, and if not, issues a channel shift request. The monomulti 106 generates a pulse equivalent to one bit of the transmission signal to make the clock output from the gate 102 toothless. This loop continues until the synchronization circuit 105 can achieve synchronization.

On the other hand, data insertion is done by selector 107 and monomulti 108
This is done by The gate 109 prevents new data from being inserted at an incorrect position in an unsynchronized state, and the output signal of the selector 107 is sent to the transmission line by the transmitter 110. When simply monitoring the input signal, selector 107. mono multi 10
8 and gate 109 can be omitted.

Therefore, without separating into n multiplexed high-speed signals ftn, it is possible to directly read from the time slot to which a specific data channel is assigned using the n-divided synchronous clock, which avoids increasing the size and makes the device more efficient. It has the advantage of being

This n-divided synchronous clock is also used to insert a new signal into a specific data channel. Generally, branching and insertion are performed in the same channel, but by shifting the insertion clock, insertion into any channel is possible. Furthermore, even if the multiplexing number n changes, there is an advantage that only the n frequency divider needs to be replaced, and most of the other hardware can be used as is.

Effects of the Invention As explained above, according to the present invention, a means for eliminating black and white information, an n frequency divider, and a means for directly branching and inserting only a specific channel from a transmission signal are provided. By having such a configuration, it is possible to efficiently drop or insert only a specific signal from a multiplexed signal.

Particularly in optical fiber cable transmission in which basic signals are synchronously multiplexed and transmitted at high speed, it is possible to realize a drop insert repeater with low cost and high flexibility.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a diagram of a conventional general drop-insert repeater. 11... Data signal (DATA), 12...
...-Clock signal (CLK), 101...Receiver, 102...-Gate, lO3...
n frequency divider, 104...D flip-flop, 1
05... Synchronous circuit, 106... Mono multi, 107... Selector, 108...
・Mono multi, 109...Gate, 110...
...Transmitter.

Claims (1)

[Claims] It has a receiver, a demultiplexing circuit, a switching switch, a multiplexing circuit, a synchronization circuit, a transmitter, etc., and transmits n multiplexed transmission signals using a bit interleaving method that sequentially arranges synchronized transmission data. In the drop-insert repeater method that separates the original signal and adds/drops data of a specific channel, the demultiplexing circuit, exchange switch, and multiplexing circuit are eliminated, and some of the clock information of the transmission signal is omitted. means to directly branch only a specific channel from the transmission signal using the n frequency divider whose phase is controlled by this means and the output clock of the n frequency divider, or to branch only a specific channel as necessary. A drop insert relay method characterized by providing a means for directly inserting new data only into a channel.