A clear summary and configuration example of GPON has been highlighted

GPON summary

PON It's a kind of point to multipoint （P2MP） Structure of passive optical network ;
GPON： Gigabit passive optical network , Layer 2 protocol
PON Composition of network ：
1、 Optical line terminal OLT

2、 Optical distribution networks ODN Transmission channel ： It mainly includes passive beam splitter and optical fiber

3、 Optical network unit / terminal ONU/ONT

4、GPON At present, the rate of is mainly The upside 1.25G And down 2.5G, Maximum logical distance 60 km , Maximum physical transmission distance 40 km , Maximum differential distance 40 km （ The farthest ONU To OLT Distance of subtract Current ONU To OLT Distance of ）, Maximum spectral ratio 128.

5、GPON Single line bidirectional transmission , System USES WDM technology , The downside 1490nm, The upside 1310nm, The downlink data stream adopts broadcast technology , Uplink data adopts TDMA（ Time division multiplexing ） technology .

6、 Downlink broadcasting , be-all ONU Will receive the same data , But by GEM PORTID To differentiate ONU The data of . The downlink uses AES128 encryption , Only right Payload encryption , The header is not encrypted , The key needs to be updated regularly .
Uplink adopts time division multiplexing , To avoid conflict .

A brief description GPON The role of several elements in the configuration

1、DBA It is used for dynamic control OLT Uplink bandwidth allocation .

2、T-CONT It is a container under the circuit template , It is mainly used to distinguish user data , binding DBA, from DBA Allocate uplink bandwidth .

3、GEM frame yes GPON The smallest unit of business encapsulation , be-all TDM Services and Ethernet services should be encapsulated into GEM Frame format , Usually, a business is encapsulated into a GEM In the frame , Different businesses use different GEM PORT ID Are identified .

4、 Line template tell ONU After you receive the user data , How to map Ethernet data to GEM frame , Which one to put again T-CONT, This T-CONT With which DBA Template binding .

ONT Management style

1、 whole OMCI Pattern , surf the internet 、 Multicast 、 Voice passes OMCI Send out , Only tier-2 businesses can be distributed , So voice VOIP（ Three layers ） Can't use .

2、 surf the internet 、 Multicast pass OMCI Send out , Voice service adopts FTP Download from the network management XML The configuration file , Re pass OMCI The channel sends voice services to ONU.

3、 adopt OMCI passageway Only distribute management VLAN And management IP, Let users remote to ONU It's equipped with .

4、OMCI+TR069 The way , The configuration management of the second layer is still passed OMCI The channel is sent to ONU, The three-tier is based on IP Through TR069 Send out .

GPON Template configuration example

1、 increase DBA Templates ：dba-profile add profile-id 22 profile-name 2M type3 assure 2048 max 4096

2、 increase ONU Line template ：ont-lineprofile gpon profile-id 66 profile-name xx

3、 The number is 2 Of T-CONT binding 22 Number DBA Templates ：T-CONT 2 dba-profile-id 22

4、 increase GEM PORT And map to the corresponding T-CONT, Serial number for 20 Carrying Ethernet Services GEMPORT Binding in T-CONT2 On , The priority for 3：gem add 20 eth T-CONT 2 priority-queue 3

5、 increase ONU Line template , by 20 Number GEMPORT The creation number is 0 The mapping relation of , Mapping to vlan10：gem mapping 20 0 vlan 10

6、 After configuration, enter ：commit

7、 Query the route template ：display ont-lineprofile gpon profile-id 66

8、 Add business template ：ont-srvprofile gpon profile-id 88 profile-name xxx

9、 To configure ONU Port capability ：ont-port eth 4 pots 2 // To configure 4 An Ethernet port ,2 Voice port

10、ONU port VLAN Set up ：port vlan eth 1 10 // Light cat's 1 Mouth configuration vlan10

11、 Query the configured business template ：display ont-srvprofile gpon profile-id 88

12、 Add one more SNMP Templates ：snmp-profile add profile-id 1 profile-name esight v2c public private 192.168.1.1 162 private