Subscriber terminating equipment

Details Subscriber terminating equipment Subscriber terminating equipment

2000-11-28

2004-08-17

Ho, Duc (Department: 2665)

Multiplex communications

Fault recovery

C370S217000, C714S004110

Reexamination Certificate

active

06778489

ABSTRACT:

BACKGROUND OF THE INVENTION
1) Field of the Invention
This invention relates to a subscriber terminating equipment suitable for use with a subscriber accommodation system.
2) Description of the Related Art
As a result of remarkable increase in demand for communication in recent years, it is requested for local exchange carriers and so forth to achieve stable signal transmission between subscriber terminals and an exchange, a router or a like equipment.
A signal transmitted from a subscriber terminal is inputted to a subscriber terminating equipment using a metallic subscriber line and terminated by the subscriber terminating equipment. Then, the signal is connected to a network interface apparatus such as an exchange, a router or the like and transmitted to a network interface apparatus of its destination.
In such a communication system as just described, when the subscriber terminating equipment fails or when the subscriber terminating equipment is stopped in order to perform maintenance, checking or the like of it, accommodation subscribers therein must be temporarily moved to another subscriber terminating equipment to perform services to them. For example, in order to perform replacement of a package, subscriber terminals accommodated in the failed package cannot enjoy services until the failed package is replaced.
Accordingly, in order to perform temporary accommodation (temporary relief) during failure of a package or temporarily switching to reserved circuits upon replacement (exchanging) of a package, a relief package (subscriber terminating package for relief) for accommodating reserved circuits is provided in advance.
When such subscriber accommodation or temporary switching is performed by switching the circuits by means of switches, the prepared relief package is used to perform the switching of the switches between the subscribers and the network interface fully automatically (by unattended remote operation) through the switching of a minimum but necessary number of switches and increase of a minimum but necessary number of wiring lines.
FIG. 44
is a diagram showing an example of a system construction of a communication network. Referring to
FIG. 44
, the communication network
96
shown includes a plurality of subscriber terminals (network terminals; a network terminal (NT) may sometimes be referred to simply as terminal)
70
-
1
to
70
-n and
76
-
1
to
76
-n, a plurality of subscriber lines
81
-
1
to
81
-n and
82
-
1
to
82
-n, subscriber terminating equipments
71
and
75
, network interface apparatus
72
and
74
, and a network
73
. Each of the network interface apparatus
72
and
74
is formed from an exchange, a router or a like equipment and exhibits functions of the same.
A signal from any of the subscriber terminals
70
-
1
to
70
-n is transmitted from the network interface apparatus
72
to the network
73
after an electric connection path therefor is set by the subscriber terminating equipment
71
. Also a signal from the network
73
is transmitted in a similar manner to any of the subscriber terminals
76
-
1
to
76
-n.
FIG. 45
is a detailed block diagram of the subscriber terminating equipment
71
. Referring to
FIG. 45
, the subscriber terminating equipment
71
shown includes a plurality of subscriber terminating packages LT#
1
to LT#n for connecting/disconnecting the plurality of subscriber terminals
70
-
1
to
70
-n, and a relief package LT#RS.
Each subscriber terminating package LT#i (i is a natural number from 1 to n) individually performs line termination and circuit termination in order to allow the subscriber lines
81
-i to be accommodated in the network interface apparatus
72
and includes a subscriber connection/relief switch
85
-i and a subscriber circuit
84
-i.
Meanwhile, the relief package LT#RS is provided to relieve subscribers accommodated in any of the subscriber terminating packages LT#i when a fault occurs with the subscriber terminating package LT#i (such package is hereinafter referred to as fault package). The relief package LT#RS includes a subscriber connection/relief switch
85
-RS and a subscriber circuit
84
-RS similarly to the subscriber terminating packages LT#i.
The subscriber connection/relief switch
85
-i connects/disconnects the subscriber line
81
-i from the subscriber terminal
70
-i and performs, when a fault occurs, path switching from the fault package LT#i to the relief package LT#RS and other necessary operation.
The subscriber circuit
84
-i processes a signal from the subscriber terminal
70
-i connected by the subscriber connection/relief switch
85
-i and includes a four-line/two-line conversion circuit
86
, a transmission circuit (transmission driver)
87
a
, a reception circuit (receiver)
87
b
, a line terminating circuit section
88
, a circuit terminating circuit section
89
and an interface section
90
.
The four-line/two-line conversion circuit
86
converts a signal transmitted in balance from the subscriber connection/relief switch
85
-i into a four-line signal (or vice versa). The transmission circuit
87
a
transmits the transmission signal produced by the line terminating circuit section
88
to output it to the subscriber line
81
-i. The reception circuit
87
b
receives a signal transmitted thereto from the subscriber terminal
70
-i over the subscriber line
81
-i through the four-line/two-line conversion circuit
86
and outputs the signal to the line terminating circuit section
88
.
The line terminating circuit section
88
shapes the waveform of a signal, which has passed through and thereupon been attenuated and distorted by the subscriber line
81
-i, and amplifies the signal of the shaped waveform and extracts a clock signal from the transmission data. In particular, since deterioration attenuation and distortion occur with the transmission data of a digital signal while it is transmitted along a line, the line terminating circuit section
88
shapes the waveform of the transmission data and outputs resulting data to the circuit terminating circuit section
89
.
The circuit terminating circuit section
89
performs signal termination processing such as frame synchronizing processing of transmission data, addition/extraction of a signal for transmission of control or information, and error correction. The circuit terminating circuit section
89
performs the signal termination processing by digital processing.
The interface section
90
converts the format for use with the subscriber terminating equipment
71
into another format for allowing the data to be handled by the network interface apparatus
72
.
Thus, the subscriber terminal
70
-i is physically connected by the subscriber connection/relief switch
85
-i, and conversion of a signal from a 2-line signal into a 4-line signal is performed by the four-line/two-line conversion circuit
86
. Then, the reception signal is received by the reception circuit
87
b
, and waveform shaping and amplification of the signal, which has been attenuated and distorted during transmission thereof over the subscriber circuit, are performed by the line terminating circuit section
88
. Then, frame processing and so forth of the signal are performed by the circuit terminating circuit section
89
. Thereafter, the signal is converted into a signal of the format for use with the network interface apparatus
72
by the interface section
90
and then transmitted to the network interface apparatus
72
.
On the other hand, a signal from the network interface apparatus
72
is converted into a signal of the predetermined format by the interface section
90
, and frame processing is performed for the signal by the circuit terminating circuit section
89
. Then, waveform shaping (conversion) suitable for the signal to be outputted to the subscriber lines
81
-i is performed for the signal from the circuit terminating circuit section
89
by the line terminating circuit section
88
. Further, the signal is converted from a four-line signal into a two-line signal by the four-line/

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