JPH04258043A - Common use system for demultiplex and generative relay sections for terminal station equipment - Google Patents

Abstract

PURPOSE:To obtain general-purpose property such as correspondence at an output fault of a reception section of a multiplex/demultiplex section by providing a connector to the outside of a multiplex/demultiplex unit and connecting directly signal data from a reception section to a transmission section. CONSTITUTION:A connector 1 is provided to an outside of a multiplex/ demultiplex unit to connect a signal data from a reception section R to a transmission section S in a way that the transmission/reception of the data of the reception section R to/from the transmission section S of the multiplex/ demultiplex unit MLDM. Moreover, a clock from reception section R to the transmission section S is sent/received at the outside of the unit and a selector 2 to select other clock from an external oscillator 10 is provided. Thus, when a fault such as signal interrupt takes place in an output data of the reception section R, the selector 2 is used to select an output clock of the external oscillator from a clock outputted from the reception section R, then the control signal is passed by the clock even when a main signal is not passed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an optical transmission system.
In particular, the demultiplexer M of the time-division terminal equipment LTE of the optical line.
LDM (MUX/DMUX section) and playback relay section REG
This invention relates to a configuration method of a circuit that is shared by both.

0002

2. Description of the Related Art A common use of a demultiplexing section and a regenerative repeating section of a conventional terminal station equipment is as shown in the block diagram of FIG. The multiplexed signal is time-division multiplexed using the output clock and sent to the electrical/optical converter OS (E/
It receives the multiplexed signal from the transmitting section S which transmits to the O section) and the optical/electrical converter OR (O/E section) in the opposite direction, separates it in a time-division manner using the control signal OHB, DMUXs it, and sends it to the corresponding external channel. A demultiplexing unit MLDM (MUX/DMUX unit) consisting of a receiving unit R that outputs to CH2, the electrical/optical converter OS (E/O unit), the optical/electrical converter OR (O/E unit), and the connection between them. In the terminal equipment LTE, which consists of a right-hand cable and a left-hand cable, as shown in Figure 5, the demultiplexer M on the right output side
The data and clock that the LDM demultiplexes and outputs to the external channel CH2 are transferred to the demultiplexer MLDM unit (LSi), which consists of a receiver R and a transmitter S.
By directly connecting the receiving section R to the transmitting section S using a control signal OHB, a regenerative repeater REG was configured to transmit received data.

0003

[Problems to be Solved by the Invention] In the conventional system, as described above, the data of the receiving section R is connected to the transmitting section S in the unit LSi of the demultiplexing section MLDM, so the connection is made as shown in FIG. As shown in the figure, it is only possible to realize a configuration in which the output data of the receiving section R is simply looped back to the transmitting section S of the own unit.
It has the disadvantage that it lacks versatility, such as transmitting data from the receiving section R as data from the transmitting section S of a separate unit, and dealing with failures such as disconnection of received data or phase deviation. An object of the present invention is to provide a shared system for a demultiplexing section and a regenerative relay section of a terminal device having the above-mentioned versatility.

0004

[Means for Solving the Problem] As shown in the principle diagram of FIG. 1, the purpose is to transfer data from the receiving section R of the demultiplexing unit MLDM to the transmitting section S outside the unit MLDM. A connector 1 for connecting signal data from the receiving section R to the transmitting section S is provided outside. or,
A selector 2 allows the clock from the receiver R to the transmitter S of the demultiplexer MLDM to be passed outside the unit, and can also select another clock from the external oscillator 10.
Make sure to have the following.

[0005]

[Operation] In the present invention, the connector 1 is connected to the demultiplexer MLDM.
The receiving section R is provided outside the unit (LSi).
The signal data D1 is directly connected from the transmitter S to the transmitter S. Then, the selector SEL 2 selects the signal from the receiving section R to the transmitting section S.
The clock CK1 to the oscillator 10 can also be passed outside the unit, and another clock CK2 from the external oscillator 10 can be selected.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a block diagram showing the configuration of a common system for a demultiplexing section and a regenerative relay section of a terminal equipment according to an embodiment of the present invention. The output of the optical/electrical converter OR (O/E section) is received and multiplexed, the necessary channels are separated, and the output is sent to the electrical/optical converter O.
The receiving section R and the transmitting section S of the unit (LSi) of the multiplexing/demultiplexing section MLDM that transmits to S (E/O section) are mutually independent, and the signal data D1 is sent from the receiving section R to the transmitting section S of its own unit. The external connector 1 of the unit
Do it with Further, the clock CK1 from the receiving section R to the transmitting section S of the own unit is also passed outside the unit, and can be selectively switched to another clock CK2 from the external oscillator 10 using the selector 2 SEL. If the receiving section R
If a failure occurs in the output data D1 of the output data D1, such as a signal disconnection or a phase shift, the main signal D1 can be changed by switching the output clock CK1 of the receiving section R to the output clock CK2 of the external oscillator 10 using the selector SEL2. Even if it does not pass, the control signal OHB can be passed by the clock CK2.

FIG. 3 shows the configuration of a common system for the demultiplexing section and the regenerative repeating section of the terminal equipment according to another embodiment of the present invention. D1 and clock CK1 can be looped back to the transmitter S of another unit outside the unit. The phase adjustment circuit 11 between the receiving section R and the transmitting section S is required when the time positions of the output data D1 of the receiving section R and the clock CK1 of the frame timing are different. Although not shown,
This can be realized with a simple configuration of just passing through several stages of flip-flop FFs.

[0008]

[Effects of the Invention] As explained above, the shared system of the demultiplexing section and the regenerative relay section of the terminal equipment of the present invention has versatility, such as dealing with failures in the output of the receiving section of the demultiplexing section. ,
The effect of simplifying the circuit configuration of the optical transmission system and thereby reducing costs can be obtained.

[Brief explanation of the drawing]

[Fig. 1] A principle diagram showing the basic configuration of a shared method for the demultiplexing section and the regenerative relay section of the terminal equipment of the present invention.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention;

FIG. 3 is a block diagram showing the configuration of another embodiment of the present invention;

[Fig. 4] Block diagram showing the configuration of a conventional optical terminal equipment LTE,

FIG. 5 is a block diagram of a common system for a demultiplexing section and a regenerative relay section of a conventional terminal device.

[Explanation of symbols]

1 is a data connector external to the demultiplexer, 2 is a clock selector SEL, 10 is an external oscillator, and 11 is a data phase adjustment circuit.

Claims (1)

[Claims] Claim 1: A demultiplexing unit (M) consisting of a receiving section (R) and a transmitting section (S) of a time division terminal equipment (LTE).
LDM) and a relay unit (REG) that passes data from the receiving unit (R) to the transmitting unit (S) for transmission, and is a shared circuit for transmitting signal data from the receiving unit of the demultiplexing unit to the transmitting unit. Connector (1) that performs delivery outside the unit
and a selector (2) which also passes a clock from the receiving section to the transmitting section outside the unit and can select another clock from an external oscillator (10). A shared method for the separation section and regeneration relay section.