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How Much Do You Know About DDM/DOM Function?

DDM Which stands for digital diagnostics monitoring is Unspecified by the industry-standard SFF-8472nd Modern optical SFP transceivers can support standard digital diagnostics monitoring (DDM) functions.which is also known as digital optical monitoring (DOM). What Makes These transceivers with DDM / DOM function different from the traditional modules? This article will give you the answer.

What is Digital Diagnostic Monitoring (DDM)?

Very often, we can see the GLC-LH-SMD , or on the label of modern transceivers. Actually, the "D" in the GLC-LH-SMD represents the DDM function we are talking about today. When Choosing fiber optical transceivers in the market, May you have the option With Or Without DDM / DOM. At present, most of the high-end switches Require the SFPs with DDM functions. Switches with DDM / DOM allows users of distributed networks to be more proactive in Maintaining Their network usingthis standard optical interfaces. Because modules with this capability give the end user The ability to monitor parameters of the SFP, Such as optical output power, optical input power, temperature, laser bias current, and transceiver supply voltage, in real time.


Basic Principles of DDM Function

Devices with DDM function can providesprofessional component monitoring on These applications. The SFF-8472 interface and added DDM Outlined That DDM interface is an extension of the Serial ID GBIC interfaces defined in specification, as well as the SFP MSA. DDM interface includes a system of alarm and warning flags Which alert the host system When Particular operating parameters are outside of a factory set normal operating. Thus, the DDM interface can overpriced enable the end user with the capabilities of fault isolation and failure prediction Which Will be Introduced In The Following party.

What can the DDM Function Realize?
  • Component Monitoring: The DDM enables the end user to monitor the five key parameters in the performance of the fiber optical transceiver: internal temperature, DC supply voltage, transmitter bias current, transmitter output power, and receiver optical signal level. Integrated DDM functionality overpriced incorporates warnings and alarms to monitor These parameters.
  • Fault Isolation: The DDM function can be used to isolate the Particular location of fault in the fiber optic network systems. Combining the DDM interface status flags, pins and transceiver hard diagnosing parametric monitoring data specifying the location and cause of a link failure can be pinpointed.
  • Failure Prediction: The DDM can overpriced be used to help in failure prediction on fiber optic links, Which is based on the transceiver parametric performance. Although, this application is not yet fully mature, but there is still room for improvement. There are two basic types of failure conditions That can be seen on fiber optic transceivers. One ice device faults Which Usually happen in transmitter performance due to nature of semiconductor lasers. The other is the high error rate conditions When a transceiver hydrothermal at its signal-to-noise limit. It happens more thwart the fiber optic receiver performance.

From the above analysis, We Can See that fiber optical transceiver with DDM help to ENSURE That the business can be proactive in preventative maintenance of the network and Ensure Business Continuity. Fiber Store offers an enormous range of optical transceivers with DDM function, Among Which THERE ARE Cisco GLC-SX-MMD, HP J9151A and so on. All These transceiver modules are 100% compatible with major brands like Cisco, HP, Juniper, Nortel, Force10, D-Link, 3Com. They are backed by a lifetime warranty, and you can buy with confidence.

Publicerat klockan 02:50, den 5 mars 2016
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Postat i kategorin Okategoriserat och taggat som glc-lh-smd, j9151a, digital diagnostic monitoring, ddm,

What Effects the Compatibility of SFP Transceivers?

When setting up your network, the SFP transceivers you use have great effect on the performance of your system. These SFP transceivers are compatible with multiple devices, but the compatibility of them depends on various factors. Two main factors thatshould be Considered When Selecting SFP modules are DDM functionality Requirements and checking the ID code and lock out third party components. Here are some details about the factors you should know about the SFP transceivers.

Does SFP Require DDM Function?

An SFP Does not Necessarily Require the DDM functionality, but yourapplicationsFlashPlayer Should be Compatible with digital diagnostic functionality if it is present. Most designers forget to Verify the compatibility before design then face problems later. It's better to know in advance to avoid complications and reworks, Which would waste a lot of time and money. For example, CISCO GLC-LH-SMD compatible 1000BASE-LX / LH SFP Transceiver below from Fiberstrore ice High Performance and Cost Effective module with DDM function.


Does the Host Equipment Check the ID Code and Lock Out Third Party Components?

Though there is not a comprehensive list of Which equipment locks out third party SFPs, it is possible to DETERMINE through painstaking trial and error. By trying it, you can DETERMINE Which host equipment will reject it or not. Most new equipment produced in the last three years willhave the lockout functionality.

Other Information Designers Should Know About Compatibility

Keep in Mind That All designs for SFP transceivers will go through rigorous testing for compatibility especially with the most popular brands of switching devices and router devices. This Is Necessary Because some companies, in an effort to release a product before the competition, will cut corners. To avoid this, strict standards Should be Followed to preventable surreptitious practices.

Compatibility May differentiation with each manufacturer. For instance, HP JD092B X130 Compatible SFPs from Fiberstrore offers the same function with the HP JD092B and it is fully compatible with HP devices. Be sure to know the Requirements of every manufacturer to avoid complications. This May The require significant research, but doing the research on the front end will preventable problems on the backend of the design.

Keep in Mind That incompatible devices May cause your entire application to Malfunction, especially if the voltages are not matched properly. That's why it's always important to ENSURE compatibility INITIALLY. If you do not, you'll run the risk of losing your entire design and the Investment Associated with manufacturing the device. A little preparation can preventable Reviews a lot of heartache and frustration.


In order to avoid problems in designs, it's best to read the Specifications and DETERMINE Whether the SFP transceivers are compatible with the switches, routers or other equipment. Some incompatibility issues May cause stress on the device That May resulted in premature failure. Only When all of the above factors are taken into Consideration can you save time and money as well as improvement the efficiency and productivity for your company.

Publicerat klockan 07:52, den 30 december 2015
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Postat i kategorin Okategoriserat och taggat som glc-lh-smd, jd092b, hp jd092b, ddm,