• 1. Introduction Optical fiber sensing takes advantage of the physical properties of light as it passes through the optical fiber to detect changes in temperature, strain and other parameters. Optical fiber has wide working frequency band and large dynamic range, which is suitable for remote measurement and remote control. It is an excellent low loss transmission line. Under certain conditions, optical fiber is particularly easy to accept the measured or field loading, and is an excellent sensing element. The optical fiber is electrically neutral, small in size, light in weight, flexible, anti electromagnetic interference, and good in radiation resistance. It is especially suitable for use in flammable, explosive, space restricted, strong electromagnetic interference and othe...
    2022 - 09 - 29
NEWS CENTER
News Blogs

What is DDM?

Date: 2022-08-10
Views : 8

As the application of optical modules in optical communication becomes more and more extensive, the speed, packaging, power consumption and functions are all developing in the direction of high speed, small size, low power consumption and multi-function. When you search the SFP, you always see that 'DDM support'. So what is DDM?What does DDM mean?Now let's talk about the Digital Diagnostic Monitoring (DDM) function.


 

What is DDM?


Definition of DDM

DDM (Digital Diagnostic Monitoring), formulated by the industry organization SFF Committee, works in accordance with the standard parameters defined by the SFF-8472 multi-source protocol, and regulates the standard values or ranges that the software and hardware of optical modules and network equipment need to follow. The interoperability of the products offered between network equipment suppliers and optical module suppliers is ensured. DDM is a real-time parameter monitoring technology for optical modules, including operating voltage, operating temperature, received optical power, transmitted optical power and laser bias current.

 



Functions of DDM

In addition to monitoring parameters, DDM also has other functions such as alarming, fault prediction and fault location.

1. Alarming: When the environmental parameters of the optical modules exceed the specified standard range, an alarm will be sent to the system, indicating that the module is in a bad state, the transmitter will stop sending data, and the receiver will also refuse to receive data.

2. Fault prediction: To predict the degradation of the laser by monitoring the bias current of the laser, so as to ensure that the service is switched to the standby link or the optical modules that may fail before the fault occurs, so it plays a big role in predicting the life of the optical modules .

3. Fault location: Through comprehensive analysis of alarm signs or alarm conditions, monitoring parameter information and optical module pins, etc., the location of link faults can be quickly located, thereby reducing the repair time of system fault.


How to View DDM Information

There are two main ways to view the DDM information of an optical module: SNMP and commands.

1. SNMP, the Simple Network Management Protocol, is a standard protocol specially used for IP network management of network nodes. The optical module DDM information like the received optical power and transmitted optical power can be read through SNMP.

2. Due to different brands of equipment suppliers, the MIB (Management Information Base) and OID (Object Identifiers) of SNMP are different, some devices can obtain DDM information directly through simple commands. For example, enter the Display command on a Huawei switch.

 

After reading the above content, you should have a preliminary understanding of DDM. Basically the optical modules provided by BEIHAI all have DDM functions, and are widely compatible with major brands of switches. You can buy with confidence! Of course, you can also contact our customer service for confirmation before purchasing.


Recommending News / Recommending News More
2022 - 09 - 20
点击次数: 5
On September 16, the 19th China ASEAN Expo which lasts for 4 days held a grand opening ceremony in Nanning, Guangxi. Under the background of normalization of epidemic situation, all provinces, autonomous regions and cities have used the platform of China ASEAN Expo to inject strong impetus into the development of regional in-depth integration. The signed investment enterprises of th...
2022 - 08 - 05
点击次数: 10
There is a cause for optimism as the communications service providers (CSPs) enter their second decade of network transformation. That is the main finding of LightCounting's latest edition of its network transformation report entitled: Network Transformation Reaches a Pivotal Phase.On the surface, it is business as usual: CSPs are experiencing paltry growth and continue to search for new ...
2018 - 09 - 28
点击次数: 51
Nokia today formally launched the 5G MoNArch (5G Mobile Network Architecture) research project. Supported and financed as part of Phase II of the 5G Infrastructure Public Private Partnership (5G-PPP) - under the auspices of the European Union's Horizon 2020 Framework Programme - 5G MoNArch will put fifth-generation mobile network architecture into practice.The project consortium, consisting of...
News / more>>
2022 . 09 . 20
点击次数: 5
On September 16, the 19th China ASEAN Expo which lasts for 4 days held a grand opening ceremony in Nanning, Guangxi. Under the background of normalization of epidemic situation, all province...
2022 . 08 . 05
点击次数: 10
There is a cause for optimism as the communications service providers (CSPs) enter their second decade of network transformation. That is the main finding of LightCounting's latest edition of its ...
2018 . 09 . 28
点击次数: 51
Nokia today formally launched the 5G MoNArch (5G Mobile Network Architecture) research project. Supported and financed as part of Phase II of the 5G Infrastructure Public Private Partnership (5G-PPP) ...
回到顶部
扫描微信二维码
Scan QR code
Mailbox market@bhcom.in
WhatsApp-Customer service +86 181 3882 4605
   
Any shopping problem contact our online service | Tel: +86 181 3882 4605| Operating hours:Monday to Friday 9:00-17:30
电话:+86 0755-2955 6666
传真:+86 0755-2788 8009
邮编:330520
Copyright ©2018 - 2023  SHENZHEN BEIHAICOMM Co., LtdSitemap
犀牛云提供企业云服务
X
5

电话号码管理

1

qq

6

二维码管理

3

SKYPE 设置

4

阿里旺旺设置

等待加载动态数据...

等待加载动态数据...

等待加载动态数据...

等待加载动态数据...

展开