Shanxi Unicom GPON commercial test analysis
In order to verify the conditions for the promotion of GPON commercial scale, Shanxi Unicom organized the GPON pilot work to comprehensively verify the maturity of GPON's full service bearing, network planning, maintenance and management, and engineering construction in different scenarios, laying the foundation for subsequent GPON scale commercial use. .
GPON pilot scenario and verification content
The GPON pilot is divided into merchant and customer FTTB + VDSL2, merchant and customer FTTB + LAN, merchant and customer FTTO, guest and customer FTTB + ADSL2 +, guest and customer FTTB + LAN and other scenarios. Based on the combination of network resources, terrain and architectural features, Shanxi Unicom selected 7 The network sites will conduct pilot tests to verify whether GPON supports the large-scale networking commercial capabilities in various scenarios. In addition, two outlets were selected for verification of FTTM and Femtocell bearers. The following will give a detailed introduction to some scenarios.
1. Scenario 1: New establishment of merchants-outlet one
Brief introduction of the office: The first office is a high-end commercial community, which is a new property in the old city. The property has completed the comprehensive wiring and has the conditions for entering the home with optical fiber. This pilot uses FTTO to provide users with a high-bandwidth access experience.
Construction plan: A 1: 128 splitter ratio splitter downstream cable is laid along the shaft, the user enters the house through the user's hidden pipe, and the ONT plug-in accesses the user through the user's multimedia box. The networking mode is shown in Figure 1.
According to the actual needs of the application scenario, the engineering staff verified the new GPON technology in the pilot, and mainly tested three new features of GPON.
(1) High optical power budget. Access to the optical cable from the trunk optical cable to the user side usually requires multiple fusion splices and jumpers, resulting in relatively large optical attenuation. In this pilot, the distance from the OLT to the user-end optical cable is 3km. After 14 fusion splices and 8 fiber jumpers, the optical attenuation reaches 28.5dB. This pilot uses ClassC + optical modules (supporting 32db optical power budget) to test the system's commercial capabilities.
(2) Large-capacity OLT. FTTH consumes a large amount of PON ports. If the existing OLT form is adopted, the capacity of a single node will be too low, which will inevitably reduce the position of the OLT network. In this pilot, 8PON GPON boards are used, and the single frame can be connected to a large-capacity OLT of 16,000 FTTO users for user access to test the commercial capacity of the large-capacity OLT.
(3) Large spectral ratio. With the construction of 3G and the speed-up of broadband, a large amount of backbone optical cable resources are consumed, and backbone optical cables are increasingly becoming a scarce resource. The FTTO construction model consumes a lot of optical fiber resources. The pilot used a 1: 128 splitter to save the backbone optical cable occupation and tested GPON's ability to support a large split ratio of 128.
2. Scenario 2: Full service bearer-outlet two
Brief introduction of the site: The second site is located in the high-end community of Kouzhuang West Road, Xiaodian District. The community has a total of 6 buildings with 28 floors and nearly 1,000 users; the model room is located in the residence on the 8th floor of the community. Distributor and optical fiber cable are deployed, and the optical fiber cable enters the house through the user pipeline, and ONT realizes the access of each room through the home multimedia box. The networking mode is shown in Figure 2.
At present, the services opened by the site include ordinary voice, video voice, IPTV, high-speed Internet access, BoD Internet access, 3G mobile phone Femtocell access, etc., which realizes GPON to carry all services, especially to Femtocell business, Femtocell as a The new equipment form makes full use of the existing fixed broadband network backhaul service.
Pilot content and results: 3G terminal to verify the carrying capacity of mobile voice, wireless Internet access, mobile streaming media services on GPON. GPON can satisfy the above three types of service bearers and has no impact on the fixed services carried on the ONT. Femtocell (peak bandwidth 7.2Mbit / s) bears the dependence on fixed broadband, increases the demand for fixed broadband bandwidth, and puts forward higher bandwidth requirements for the current broadband speedup. The inherent high bandwidth characteristics of GPON can better meet the challenges of Femtocell bandwidth requirements. GPON has higher QoS guarantee capabilities to meet Femtocell's high QoS requirements for bearers. Huawei's GPON system supports 1588V2 to meet Femtocell's clock requirements.
3. Scenario 3: FTTM bearer-outlet three
Pilot purpose: With the acceleration of PON network construction, a large number of optical fibers are moved down to the access end. At the same time, with the large number of 3G base stations deployed, 3G base stations and PON network equipment are jointly covered in the cell. In the PON network ODN planning and construction, the demand for optical fiber of the base station is also fully considered. The cells selected in this pilot have 2G, 3G base stations and GPON network coverage at the same time, and the GPON mobile bearer capacity is tested through the pilot.
Brief introduction of the pilot situation: The original 2G and 3G base stations of the three outlets adopt the common computer room construction scheme. In this test, GPON terminals are used to access the 2G and 3G base stations at the same time, the clock is transmitted by E1, and the upstream uses the STM-1 and GE interfaces of the OLT to realize voice and mobile The offloading of Internet access services is respectively connected to the transmission and IP networks.
Pilot content and results: The GPON system can meet the high-precision transmission of 50 ppb clocks. The Huawei GPON system also supports the 1588V2 clock transmission method. The OLT upstream uses LAG to achieve link aggregation protection; subsequent plans to use TypeB as ONU uplink protection. It can achieve 50ms protection switching, and the network reliability requirements of mobile bearers. The GPON system can achieve the reliability protection of the entire PON network.
GPON verification results
This pilot test not only verified the advantages of GPON's high split ratio, high luminous power, high bandwidth, and clock transmission for the carrying of converged services, but also verified the impact of GPON equipment form, network planning, and ODN planning features on the existing PON construction model, thus Evaluate the commercial capabilities of GPON.
1. Equipment form. All service interface types required by various scenarios in the existing PON construction mode can also be satisfied by GPON equipment, meeting the equipment port requirements of the Group's EPON bidding, and meeting the equipment requirements of Shanxi Unicom's various broadband speed-up scenarios.
2. ODN planning. Since the form of GPON equipment is consistent with the existing PON equipment, considering the consistency of ODN, Shanxi Unicom still uses the original PON planning principles for GPON ODN planning. The ODN plan of the network, GPON has higher bandwidth under the same split ratio and the number of ONU ports, which meets the requirements of broadband speed increase.
3. network layout. IP address, VLAN and QoS planning adopt the same planning method as the existing network PON network to maintain the consistency of the network, because the consistency of the network planning can be consistent with the pre-deployment plan already implemented on the existing network.
4. Equipment certification. GPON's MDU and SBU terminals are authenticated in SN mode. After the equipment is installed, only the SN code needs to be returned to achieve ONU authentication according to the network pre-deployment plan. The address authentication method is the same, which is in full compliance with the existing equipment acceptance and authentication methods.
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