CN201590874U

CN201590874U - OLT equipment with QAM function

Info

Publication number: CN201590874U
Application number: CN2010290120402U
Authority: CN
Inventors: 陶圣华
Original assignee: Shandong Taixin Electronics Co Ltd
Current assignee: Shandong Taixin Electronics Co Ltd
Priority date: 2010-03-01
Filing date: 2010-03-01
Publication date: 2010-09-22
Anticipated expiration: 2020-03-01

Abstract

The utility model relates to the field of digital TV and communications, and provides OLT equipment with QAM function which is structured by including a network interface unit and an optical interface unit; the network interface unit is bidirectionally connected with a FPGA module; the optical interface unit is bidirectionally connected with an the FPGA module through an optical module I; the FPGA module is connected with a PON port through at least one module II; meanwhile, the FPGA module is connected with a mixer through a digital-to-analogue conversion device and an amplifier; the mixer is connected with a RF port; and the digital-to-analogue conversion device is also connected with a clock device. The OLT equipment with QAM function can use one device to simultaneously realize the functions of QAM modulation and OLT, and has the advantages of high integration and strong function, occupies small space of machine room, is easy to be installed and used, and is easy to implement HFC bidirectional network transformation, etc.

Description

A kind of OLT equipment with QAM function

Technical field

The utility model relates to the Digital Television and the communications field, has proposed a kind of OLT equipment of the QAM of having function.

Background technology

Along with the particularly fast development of information technology of science and technology, human society has entered digitlization, information age, and radio and television digitlization process is all being accelerated in countries in the world.Home broadcasting television digitization process constantly advances, yet present domestic digital TV network is based on unilateral network, appearance along with new business such as online interaction, and the propelling of telecommunications network, broadcasting and television network and the Internet integration of three networks process, various places are all in the bidirectional rebuilding of accelerating cable TV network.

EPON (ethernet passive optical network) is a kind of novel Optical Access Network technology, and it adopts point to multipoint configuration, passive fiber transmission, and multiple business is provided on Ethernet.It has adopted the PON technology in physical layer, uses Ethernet protocol at link layer, utilizes the topological structure of PON to realize the access of Ethernet.Therefore, it combines the advantage of PON technology and ethernet technology: low cost; High bandwidth; Autgmentability is strong, flexibly service reorganization fast; Compatibility with existing Ethernet; Management easily etc.The EOC technology is the general designation in transmission over coaxial cable Ethernet data technology, and it makes full use of existing CATV coax network, can realize the bidirectional rebuilding of HFC unilateral network economical, efficiently.EPON+EOC is one of preferable solution of the two-way net transformation of present CATV.

OLT equipment is imperative equipment in the EPON system, yet present OLT equipment does not possess the QAM modulation function, can only be used for the EPON system, can not be used in the one-way CATV network network.Like this, the radio and TV operator who does not satisfy at present bilateral network transformation condition can only use the QAM modulator with single QAM function, in case these radio and TV operators satisfy bilateral network and transform the condition needs and carry out bilateral network when transforming, can not utilize existing QAM equipment to carry out software upgrading, can only buy OLT equipment again, increase cost, and place QAM equipment simultaneously and the OLT equipment occupation space is big in machine room, equipment is installed, is safeguarded and uses inconvenient.

Summary of the invention

The purpose of this utility model is exactly not possess the QAM modulation function in order to solve present OLT equipment, in the bilateral network transformation, need to buy new OLT equipment at the wired TV one-way network, increase equipment cost, place QAM equipment simultaneously in the machine room and the OLT equipment occupation space is big, equipment is installed, problems such as maintenance and use inconvenience, a kind of OLT equipment of the QAM of having function is provided, it has can realize QAM function and OLT function simultaneously, has the integrated level height, function is strong, it is little to take the machine room space, installs, safeguard, use simply, be easy to carry out advantages such as the two-way net transformation of HFC.

To achieve these goals, the utility model adopts following technical scheme:

A kind of OLT equipment with QAM function, it comprises network interface unit and UFIU UMSC Fiber Interface Unit, and network interface unit is connected with the FPGA module is two-way, and UFIU UMSC Fiber Interface Unit is connected with the FPGA module is two-way by at least one optical module I; The FPGA module is connected with the PON mouth through at least one optical module II, and the FPGA module is connected with blender through digiverter, amplifying device simultaneously, and blender is connected with the RF mouth, and digiverter also is connected with clock apparatus.

Described network interface unit comprises at least a in RS232 serial ports and the RJ45 network interface, and RS232 serial ports and RJ45 network interface are configured and manage equipment, and the RJ45 network interface also is responsible for carrying out data communication between described OLT equipment and the first line of a couplet equipment.

Described UFIU UMSC Fiber Interface Unit is a SFP light mouth, and SFP light mouth is responsible for carrying out data communication between described OLT equipment and the first line of a couplet equipment.

Described optical module II has three, and optical module I and optical module II are converted into light signal that the signal of telecommunication is given the FPGA module and the signal of telecommunication that the FPGA module is sent is converted into light signal and sends by corresponding ports.

Described digiverter is two D/A modules, and two D/A modules all are connected with clock module; Described amplifying device is two amplifiers, and they are connected with blender, and the D/A module is converted into the RF signal with Digital Signal Processing, sends into respective amplifier.

Described clock module is a voltage controlled oscillator, and control respective counts digital-to-analog conversion apparatus is handled conversion to digital signal.

OLT equipment can be used as independent OLT equipment and uses by the software of upgrading difference in functionality, also can be used as independent QAM equipment and uses, and can also use as OLT equipment and QAM equipment simultaneously.

The beneficial effects of the utility model are: described OLT equipment has the QAM modulation function, can be applied to wired TV one-way network and cable TV two-way network simultaneously, hardware integrated level height, software function is powerful, it is little to take up room, installation, maintenance, easy to use help the bidirectional rebuilding of cable TV network.In addition, two D/A modules of this equipment are controlled by a clock module jointly, have reduced the phase mutual interference between the D/A module, have increased the precision of RF signal, have improved the RF signal quality.

Description of drawings

Fig. 1 is the structural representation of the OLT equipment of the QAM of having function described in the utility model;

Wherein, 1, the RS232 serial ports, 2, the RJ45 network interface, 3, SFP light mouth, 4, optical module I, 5, the FPGA module, 6, the D/A module, 7, amplifier, 8, blender, 9, clock module, 10, the PON mouth, 11, the RF mouth, 12, optical module II.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes a part of the present utility model, and illustrated embodiment of the present utility model and explanation thereof are used to explain the utility model, and improper qualification of the present utility model in pairs inadequately.

A kind of OLT equipment as shown in Figure 1 with QAM function, it comprises RS232 serial ports 1, RJ45 network interface 2 and SFP light mouth 3, RS232 serial ports 1 and 5 two-way connections of FPGA module, RJ45 network interface 2 and 5 two-way connections of FPGA module, SFP light mouth 3 is by optical module I4 and 5 two-way connections of FPGA module, FPGA module 5 is connected with PON mouth 10 by one group of optical module II12, FPGA module 5 is connected with one group of D/A module 6 simultaneously, each D/A module 6 is connected with clock module 9 respectively, each D/A module 6 is connected with corresponding amplifier 7 respectively simultaneously, each amplifier 7 is connected with blender 8, and blender 8 is connected with RF mouth 11.

RS232 serial ports 1 is responsible for equipment is configured and manages.RJ45 network interface 2 is responsible for equipment is configured and manages, and also is responsible for simultaneously carrying out data communication between described OLT equipment and the first line of a couplet equipment.

SFP light mouth 3 is responsible for carrying out data communication between described OLT equipment and the first line of a couplet equipment.

Optical module II12 has three, and optical module I4 and optical module II12 are responsible for that all light signal is converted into that the signal of telecommunication is given FPGA module 5 and the signal of telecommunication that FPGA module 5 is sent is converted into light signal and sends by corresponding ports.

FPAG module 5 can realize QAM function and OLT function by software control.

D/A module 6 has two, and they are connected with clock module 9 respectively; Described amplifier 7 also has two, is connected one to one with each D/A module 6 respectively, and two amplifiers 7 are connected with blender 8; D/A module 6 is converted into the RF signal with digital signal, sends into respective amplifier 7, and amplifier 7 is sent into blender 8 after the RF signal is amplified, and blender 8 outputs to RF mouth 11 after two-way RF signal is synthesized one road RF signal.

Clock module 9 is a voltage controlled oscillator, controls 6 pairs of digital signals of corresponding two D/A modules simultaneously and handles conversion.

OLT equipment shown in the accompanying drawing 1 has the QAM modulation function, can be applied to wired TV one-way network and cable TV two-way network simultaneously, hardware integrated level height, software function is powerful, it is little to take up room, and installation, maintenance, easy to use help the bidirectional rebuilding of cable TV network.In addition, two D/A modules of this equipment are controlled by a clock module jointly, have reduced the phase mutual interference between the D/A module, have increased the precision of RF signal, have improved the RF signal quality.

The technical staff that this area is relevant utilizes content described in the utility model can realize the OLT equipment of the QAM of having function described in the utility model easily, and the frequency points that realizes increasing QAM modulation output, increase PON mouth number, repeat no more about increasing QAM modulation frequency points expansion and increasing PON mouth number expansion the utility model.

Claims

1. the OLT equipment with QAM function is characterized in that it comprises network interface unit and UFIU UMSC Fiber Interface Unit, network interface unit and two-way connection of FPGA module (5), and UFIU UMSC Fiber Interface Unit is by at least one optical module I (4) and two-way connection of FPGA module (5); FPGA module (5) is connected with PON mouth (10) through at least one optical module II (12), FPGA module (5) is connected with blender (8) through digiverter, amplifying device simultaneously, blender (8) is connected with RF mouth (11), and digiverter also is connected with clock apparatus.

2. the OLT equipment with QAM function as claimed in claim 1, it is characterized in that, described network interface unit comprises at least a in RS232 serial ports (1) and the RJ45 network interface (2), RS232 serial ports (1) and RJ45 network interface (2) are configured and manage equipment, and RJ45 network interface (2) also is responsible for carrying out data communication between described OLT equipment and the first line of a couplet equipment.

3. the OLT equipment with QAM function as claimed in claim 1 is characterized in that, described UFIU UMSC Fiber Interface Unit is a SFP light mouth (3), and SFP light mouth (3) is responsible for carrying out data communication between described OLT equipment and the first line of a couplet equipment.

4. the OLT equipment with QAM function as claimed in claim 1, it is characterized in that, described optical module II (12) has three, and optical module I (4) and optical module II (12) are converted into light signal that the signal of telecommunication is given FPGA module (5) and the signal of telecommunication that FPGA module (5) is sent is converted into light signal and sends by corresponding ports.

5. the OLT equipment with QAM function as claimed in claim 1 is characterized in that, described digiverter is two D/A modules (6), and two D/A modules (6) all are connected with clock module (9); Described amplifying device is two amplifiers (7), and they are connected with blender (8); D/A module (6) is converted into the RF signal with Digital Signal Processing, sends into respective amplifier (7).

6. as claim 1 or 5 described OLT equipment with QAM function, it is characterized in that described clock module (9) is a voltage controlled oscillator, control respective counts digital-to-analog conversion apparatus is handled conversion to digital signal.