Hello,
I found that GPON is very different from EPON. Especially in terms of bandwidth distribution. Through learning, the main summary is as follows (summarized in the form of keywords):
1- GEM
It is a frame encapsulation mode and a two-layer technology. It mainly realizes the encapsulation of data frames, which is equivalent to the GEM format for each of the data frames transmitted to the OLT. This is equivalent to performing various types of data A unified distribution. The various types of GEM distinguish various services well.
2- T-CONT
It is equivalent to a definition of bandwidth allocation, which is a bit similar to the bandwidth channel of a class of servicesservices defined in an ONU. This definition has certain advantages, because it may effectively guarantee the transmission of various services streams. Its services flow. This is very different from PON equipment. It can be said that the introduction of the definition of T-CONT has avoided the problem of voice failure to a certain extent.
3- Mapping
This is equivalent to mapping the GEM port and T-CONT. The advantage of this mapping is that the rate of each port has a good plan. The main thing is the three-part mapping. One is the services outer VLAN, and the other is the voice VLAN, the third is management VLAN. These three VLANs will have a good isolation effect on later services after T-CONT is bound.
I clearly felt the incomprehensibility and cleverness of GPON. After studying GPON, I went back and looked at the DSLAM and EPON I learned before. Those are nothing adjustable. Suddenly I feel that there are many things to pay attention to in GPON. Corresponding before and after, while EPON and DSLAM are not so many, and I also feel that GPON is not too popular now. EPON technology is relatively mature. It can be said that GPON is a technology!
1- Still GEMport
This concept is more difficult to understand. This is equivalent to establishing a channel mode between the OLT and the ONT. Each service is transmitted up and down in its own channel. It can also be understood this way, which is equivalent to encapsulating some data into a tape Frames with GEM tags are then transmitted up and down according to the category.
GPON introduces the concept of GEMport, which separates various services separately from the data. This not only facilitates the passage of each service data stream, but also allows you to locate the problem well.
2- DBA template
This need corresponds to the T-CONT, which is to define the maximum and minimum bandwidth of each T-CONT. This is convenient for the upper limit of various services of the ONT. It is equivalent to the case where the various devices are fully configured. Through DBA and T-CONT to ensure the stability of various services of each ONT.
3- T-CONT
The introduction of this concept has well included GEMport into T-CONT. That is to say, T-CONT classifies each GEMport well. That is to say, each port is divided into pure broadband, pure voice, and pure management There are three types of services. Generally, ONT also includes these three types of services. If there are others, you can add T-CONT. The introduction of the T-CONT concept is simply to distinguish a concept provided by different services.
Fourth, ONT line module The first concept is to combine the above three concepts to complete the definition of an ONT line template. The main configuration process is as follows:
GEMport-->DBA template-->T-CONT-->ONT line template
That's all for today, you are welcome to leave a message and exchange in the comment area.
Thank you!
