CN104618052B

CN104618052B - A kind of interface circuit of GPON OLT optical modules

Info

Publication number: CN104618052B
Application number: CN201410852787.4A
Authority: CN
Inventors: 王侃; 许国威; 胥小均; 王彦伟
Original assignee: Shenzhen Gongjin Electronics Co Ltd
Current assignee: Shenzhen Gongjin Electronics Co Ltd
Priority date: 2015-03-09
Filing date: 2015-03-09
Publication date: 2017-08-04
Anticipated expiration: 2035-03-09
Also published as: CN104618052A

Abstract

The present invention discloses a kind of interface circuit of GPON OLT optical modules, including optical assembly, reset unit, limiting amplifier, the interface circuit golden finger interface pointer is consistent with EPON OLT, in the interface circuit：8th pin is provided with level handover module, in GPON system models, can input a signal into mouth by level handover module on HOST and be arranged to SD states.Internal reset clock signal input is into limiting amplifier, alarm maker is output to PIN8 after the middle alarm signal that limiting amplifier is exported is shaped into burst alarm signal, it is input to simultaneously in the reset unit exported in reset unit, reset clock signal frequency is not less than 50M.This design, just casts aside system RESET sequence problem, so that GPON OLT optical modules have more preferable system compatibility completely more than.

Description

A kind of interface circuit of GPON OLT optical modules

Technical field

The present invention relates to PON OLT optical modules field, more particularly to a kind of EPON OLT systems and GPON OLT systems Version designs optical module interface circuit altogether.

Background technology

In today of IC design high speed developments, IC integration degree more and more higher, the chip of close agreement also can be compatible It is designed into a version IC the inside altogether.In PON (passive optical-fiber network Passive optical network) system design, mesh The preceding master chip MAC in ONU (Optical Network Unit optical nodes) terminal can be using version design, one altogether Design can be applied in different access fidonetFidos simultaneously, i.e. EPON（Ethernet Passive Optical Network Ethernet passive optical network optical link local sides）With GPON（Gigabit-Capable PON gigabit passive optical networks Optical link local side）Agreement.

For operator, the hardware facility of upgrade of network will be a very huge engineering, particularly local side with The upgrading of the equipment of terminal device, no matter manpower, or financial resources are all very big expenses, and current ONU terminals have been realized in altogether The design of version, and start on some network providers application.But at OLT (optical line terminal optical line terminals) Local side, does not start to implement the common version design of OLT system also, but this will be a trend, especially for the network newly entered , can be using the relatively low EPON schemes of cost in first stage of construction for business, but the surge with user to web database technology, The GPON schemes using carrying more big data quantity are wanted to, but for local side OLT, EPON and GPON are not supported still Common version OLT system optical module scheme, reason is：The hardware protocol of the PON interfaces of OLT system is different, such as Fig. 1 and Fig. 2 institutes Show.The RESET of GPON OLT golden finger（Reset）Signal is located at PIN7, and RSSI Trigger (receive luminous intensity and indicate triggering) Signal is located at PIN9, and the PIN7 of EPON OLT golden finger is then RSSI Trigger, because the hardware of above-mentioned two signal The difference of interface, it may be difficult to using the hardware and Software for Design of version altogether, even if software realizes that will also bring Software for Design reluctantly On unstability hidden danger.If using hardware interface compatible design, will being undoubtedly a huge convenience, carry photoelectricity The OLT optical modules of conversion are also required to can adapt to this and have version design altogether, make two kinds of OLT optical modules also can hardware interface it is compatible, Solve the RESET signal of GPON OLT optical modules and EPON OLT optical modules and RSSI Trigger PINs are incompatible asks Topic.

On the other hand, the reason for OLT optical module fields can not be set foot in for many optical module manufacturers be OLT system with There is the matching problem of sequential between OLT optical modules, if correct timing Design can not be realized, then OLT system can not Normal work, but in general this sequential is rested in OLT system business's hand, can not be obtained for general manufacturer Arrive, even if obtaining, it is also desirable to carry out actual Interoperability Testing, otherwise can not still ensure normal use, and OLT system resource It is then a huge threshold.The timing Design of each OLT system manufacturer is not quite similar, so the multiple timings of OLT optical modules are simultaneous Capacitive problem is also a challenge, and this timing is the design of a nanosecond.Multi-vendor sequence problem how is solved, will be Realize the key issue that OLT is smoothly applied.In OLT sequential, including RESET sequential and RSSI Trigger sequential, during RESET What sequence was then most difficult to.

The content of the invention

The purpose of the present invention is to propose to the GPON that the common version of a kind of compatible EPON OLT systems and GPON OLT systems is designed OLT optical module interface circuits.

The technical scheme is that a kind of interface circuit of GPON OLT optical modules, including optical assembly, reset unit, Limiting amplifier, the interface circuit golden finger interface pointer is consistent with EPON OLT, in the interface circuit：8th pin is provided with electricity Flat handover module, in EPON system pattern, inputs a signal into mouth by level handover module on mainboard and is arranged to los state； GPON system models, can input a signal into mouth by level handover module on mainboard and be arranged to SD states.It can pass through on mainboard Software or hardware complete switching.Internal reset clock signal input alerts maker by limited range enlargement into limiting amplifier The middle alarm signal of device output is output to PIN8 after being shaped to burst alarm signal, while being input to what is exported in reset unit In reset unit, reset clock signal frequency is not less than 50M.

This design, just casts aside system RESET sequence problem, so that GPON OLT optical modules have completely more than More preferable system compatibility, and reach EPON OLT and the purpose of the common version of GPON OLT systems, the equipment for reducing operator Construction cost, very convenience is provided for later grid upgrading.

The present invention is described in more detail with reference to specific embodiment.

Brief description of the drawings

Fig. 1 is current GPON OLT golden finger interface pinouts.

Fig. 2 is current EPON OLT golden finger interface pinouts.

Fig. 3 is GPON OLT golden finger interface pinouts of the invention.

Fig. 4 is conduction reset diagram before GPON OLT.

Fig. 5 is conduction reset timing figure before GPON OLT.

Fig. 6 is GPON OLT GUARD Time formula reset diagrams.

Fig. 7 is GPON OLT GUARD Time formula timing diagrams.

Fig. 8 is the reset diagram in the general GPON OLT of the embodiment of the present invention.

Fig. 9 is the timing diagram in the general GPON OLT of the embodiment of the present invention.

Embodiment

Embodiment 1, as shown in figure 3, the present embodiment proposes a kind of new GPON OLT optical modules without outside RESET Solution, while the interface circuit of this GPON OLT optical modules is while compatibility GPON OLT optical modules and EPON OLT optical modes Block, hardware interface compatibility arrives EPON system and GPON systems, is a kind of general GPON to form common edition system design OLT optical modules.The maximum advantage of this general GPON OLT optical modules is its design without outside RESET, by nothing The sequential compatibling problem with multiple OLT system manufacturers need to be considered, will bring and greatly facilitate to application.

Due to by the way of without outside RESET designs, so no longer pre- on the hardware interface of the golden finger of optical module RESET input pin, the i.e. pin of PIN 7 are left, the hardware interface definition of EPON system is considered further that, by RSSI Trigger hardware In-put design is on PIN 7, and the hardware interface of such two kinds of agreement optical modules, which will be realized, to be unified, and original RSSI Trigger PIN 9 may be coupled to ground.The pin of PIN 8 in EPON OLT systems are los state, and the PIN 8 in GPON OLT systems Pin is SD pin, and both can both realize unification, and can also still keep the design of former level logic, in the application, pass through herein HOST softwares realize the switching of level.

RESET sequential on the GPON OLT optical modules of current main flow has the following two kinds：When one kind is preceding conduction RESET Sequence, one kind is GUARD Time formula RESET sequential.

Preceding conduction RESET sequential:As shown in Figure 4,5, reset is arranged on leading the inside, is directly inputted to Reset Unit （Reset unit）With Burst mode LA（Burst mode limiting amplifier）, the judgement of reset signals reset burst luminous signal Level, within the leading time of optical signal, after the completion of reset, Burst SD（Burst alarm）Set up.

GUARD Time formula RESET sequential:As shown in Figure 6, Figure 7, reset is arranged on guard time（Guard time） Interior, reset is directly inputted to Burst mode LA（Burst mode limiting amplifier）, reset Burst SD, and Burst mode LA exports Reset form LA to Reset Unit simultaneously, resets the decision level of burst luminous signal, after optical signal is set up, Burst SD are set up.

It is entirely different due to both the above RESET sequential, there is complete dissimilarity, will be determined to use by OLT system Any sequential, just so, proposes a kind of solution of the new GPON OLT optical modules without outside RESET in this patent Scheme, because will not turn into key issue the problem of the intervention without outside RESET signal, sequential, is illustrated in fig. 6 shown below. In this design, there is no the presence of outside RESET signal, then saved on the hardware interface of the golden finger of this optical module RESET input pins, therefore can be unified with EPON OLT hardware interface.Because the sequential of GPON OLT nanosecond, such as Really no RESET signal goes to reset Reset Unit and Burst mode LA, then can not meet optical signal sets up sequential, because This RESET signal must be by inside generation, but ONU sequential is not fixed, so can not be up prominent for each Data of giving out a contract for a project set a RESET signal for determining sequential in real time.For such a situation, it is input to Burst mode LA's RESET signal is the clock signal that frequency is not less than 50M, and the level of signal meets Transistor-Transistor Logic level, and Burst mode LA are in not In disconnected reset state, have burst input light in the case of, Burst mode LA output signal A also close to The Transistor-Transistor Logic level signal of clock signal frequency, signal A passes through SD generator（Alarm signal generator）After produce Burst SD, SD generator produce RESET signal Reset from SD generator and are input to Reset Unit releasings simultaneously Reset the decision level of burst luminous signal；In the case of no burst input light, the signal A of Burst mode LA outputs will It is low level, signal A produces alarm level after SD generator, and SD generator produce RESET signal simultaneously Reset from SD generator are input to the decision level that Reset Unit reset burst luminous signal.

Claims

1. a kind of interface circuit of GPON OLT optical modules, including optical assembly, reset unit, limiting amplifier, its feature exists In：

The interface circuit golden finger interface pointer is consistent with EPON OLT,

In the interface circuit：

8th pin is provided with level handover module, and inputting a signal into mouth by level handover module on mainboard is arranged to SD states；

Internal reset clock signal input is into limiting amplifier, and alarm maker believes the middle alarm that limiting amplifier is exported The 8th pin is output to after number being shaped to burst alarm signal, reset burst is carried out while producing reset signal and being input to reset unit The judgement of optical signal, reset clock signal frequency is not less than 50MHz.

2. the interface circuit of GPON OLT optical modules according to claim 1, it is characterised in that：Described optical assembly is prominent Hair pattern optical assembly.

3. the interface circuit of GPON OLT optical modules according to claim 1, it is characterised in that：Described limiting amplifier For the limiting amplifier of burst mode.

4. the interface circuit of GPON OLT optical modules according to claim 1, it is characterised in that：Mainboard utilizes hardware level 8th pin is arranged to SD states by handover module.

5. the interface circuit of GPON OLT optical modules according to claim 1, it is characterised in that：Mainboard utilizes software level 8th pin is arranged to SD states by handover module.