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The deployment of 10G PON technology has become an industry consensus

January 26, 2018/in News /by C-Data

Under the active promotion of “broadband China” and “speed up and down payment”, the broadband network is playing an increasingly prominent role as the basic platform for economic and social development. The Internet video application is rapidly gaining popularity, and the high-bandwidth business of 4K/8K HD, family cloud and video is also growing. In order to cope with the fierce market competition, operators have generally provided hundreds of megabytes (such as 100M, 200M, 500M), and opened gigabit business in some developed regions as direction.

At present, 1G-EPON and GPON have been widely deployed in China. Policies to promote, competitive drive, demand, prompting broadband access network began to MB, gigabit, to meet user demand, access technology need to be based on the rate of 10G PON technology of a new generation of platform upgrade, 10G rate of PON technology mainly includes 10G EPON, XG PON, XGS – PON.

The 10G-EPON technology is maturing

The 10G-EPON standard is IEEE802.3av (later incorporated into IEEE802.3), including 10G/10G symmetric and 10G/1G asymmetric two modes. At present, 10g-epon technology and equipment have been very mature, and China Telecom successfully realized the chip level and system level of 10g-epon in 2011. The 10g-epon device has been deployed in the FTTB scenario scale and started deployment of FTTH scenarios. Due to the difference in the cost difference between symmetric and asymmetric PON, in order to reduce the type of plate card, the OLT side only deployed symmetrical 10g-epon port in principle. Since the 10g-epon port of OLT can be compatible with three types of ONU, including 10G/10G symmetric, 10G/1G asymmetric 10g-epon ONU and 1G/1G EPON ONU, the ONU can be flexibly deployed according to user requirements.

Recently, China Telecom has focused on narrowing the range of 10G/1G EPON uplink. According to the IEEE802.3 standard, the uplink wavelength range of 10G/1G EPON is 1260nm ~ 1360nm. The purpose of this regulation is to be consistent with the uplink wavelength range of 1g-epon, but the biggest problem is to take up the precious resources of the O band 100nm. China Telecom has proposed narrowing the range to 1260nm ~ 1280nm (as shown in figure 1), which is consistent with the uplink wavelength range of 10G/10G EPON. In 10G / 1G EPON ONU has not scale FTTH deployment of uplink wavelength, the wavelength of O band can be more resources for the future of PON technology, is of great significance to maintain the sustainable development of PON network.

Figure 1.The range of ascending wavelengths is narrowed

XG-PON technology development and coexistence scheme

The XG-PON standard is the ITU-T G. 987 series, which is the asymmetric mode of the descending 10Gbit/s and the upward 2.5Gbit/s. At present,XG-PON technology and equipment have been mature. In particular, China Telecom has successfully implemented XG-PON laboratory communication in 2016 after nearly two years of testing, and has been verified in field trials. Recently, XG-PON will be deployed in FTTH scenarios.

The deployment of XG-PON should focus on the coexistence of GPON and XG-PON. Due to the difference between GPON and XG-PON and the range of uplink wavelengths, both of them coexist in a different way. There are two main types of coexistence schemes: the first is to use WDM1r (as shown in figure 2), which is described in the ITU-T standard; The second is to co-exist with GPON/XG-PON dual mode PON (optical module), which is an innovative scheme proposed by China Telecom (shown in figure 3). The proposal of China Telecom’s innovative solution is mainly to solve the problem of the insertion loss of about 1.5db in WDMr1, which leads to the problem of tight budget or shortage of link budget, and it is also easier to implement the project. Overall, these two kinds of schemes on whether ODN introduction of insertion loss, upgrade the construction difficulty, difficulty of equipment development, whether can use existing resources have different features (see the coexistence of two kinds of scheme comparison shown in table 1), there will be application scenario. At present, the two co-existing methods, especially the GPON/XG-PON dual-mode PON, have been verified by laboratory and field tests.

Figure 2. GPON co-exists with XG-PON using WDM1r

Figure 3.GPON coexists with XG-PON through dual mode PON (Optical module)

Table 1.comparison of GPON and XG-PON coexistence mode

	Method a (WDM1r way)	Method b (Dual-mode PON port way)
The introduction of insertion loss	WDM1r introduced about 1.5dB insertion loss	Independent WDM1r is not required, no insertion loss is introduced for ODN
Construction	The engineering construction is more complex, it needs to disconnect the main fiber and insert WDM1r	The engineering construction is simple, and the GPON plate can be replaced by a double-mode PON
Development difficulty	Development is relatively simple	Dual-mode optical modules are difficult to develop
Resource utilization	The original GPON board can be reused	The original GPON can not be used (can be moved to other OLT); In the future, with XG-PON, the GPON part of the dual-mode optical module is wasted

The two-mode PON usually implements two link budget levels, one is GPON Class B+ and XG-PON Class N1 integration, and the other is GPON Class C+ and XG-PON Class N2a integration. Due to GPON and XG-PON standards, the budget value of link is slightly different (GPON Class B+ is 28dB,XG-PON Class N1 is 29dB; GPON Class C+ is 32dB,XG-PON Class N2a is 31dB, and the integration of the two needs to form a unified link budget value. Considering that the two-mode PON needs to be compatible with the deployed GPON ONU, it should be unified according to the GPON link budget value (see figure 4). China Telecom has proposed the two link budget levels for the two-mode PON Class D1 (28dB) and Class D2 (32dB), and has made a slight adjustment on the basis of ITU-T standard, forming the specific indexes of optical interface parameters. In addition, it needs to be explained that the index of the two-mode PON is only related to OLT side, and the index of ONU optical interface has not changed.

Figure 4. dual-mode PON port link budget level diagram

XGS-PON technology development and deployment strategy

XGS-PON is the PON technology of the recent standard 10Gbit/s symmetric rate of ITU-T, and its standard g. 9807.1 was released in June 2016. There are two main modes of deployment of XGS-PON. The first (shown in figure 5) is the direct deployment of XGS-PON on the OLT side, which can be subdivided into GPON and XGS-PON to coexist in WDM1r mode and support coexistence of GPON/XG-PON/XGS-PON. Since OLT XGS-PON can be compatible with XG-PON and XGS-PON ONU (when Basic wavelength set is adopted, OLT supports 10G and 2.5G double rate receiving), no additional XG-PON is required on the OLT side. The second (as shown in FIG. 6) is dominated by XG-PON on the OLT side to meet the main needs of residential users; XGS-PON is designed for special scenarios with high uplink bandwidth requirements (e.g., enterprise users), deployed on demand, without considering co-existence with GPON.

Considering the different network situation and different deployment time, different operators may adopt different strategies to deploy XGS-PON. Due to the short release time of the ITU-T standard of XGS-PON, equipment maturity and interoperability have not been fully verified; At the same time, the recent XGS – PON OLT side mouth and XG – PON port cost gap is still not negligible, and from the Angle of demand, mainly residential users asymmetric bandwidth demand, therefore, the recent XGS – PON deployment to mode 2. Appropriate.

(a)GPON co-exists with XGS-PONin WDM1r mode

（b）The GPON/XG-PON/XGS-PON model PON support co-existed
Figure 5. XGS-PON deployment model I

GPON and XG-PON coexist in WDM1r mode

GPON and XG-PON co-exist with GPON/XG-PON dual mode PON

Figure 6. XGS-PON deployment model II

PON integration has become an important trend in the future

For the future evolution of PON technology, ITU – T established NG – PON2 (g. 989 series), IEEE 802.3 ca task group is working on 100 G – EPON (25 G, 50 G, 100 G three rate), but “PON fusion” is the direction of the deserves more attention. For a long time, the ITU – T and IEEE standards for PON respectively, two big system in their respective evolution, but meet the demand of basic same, this caused great waste in equipment development, also increased the complexity of the network deployment. PON fusion for operators, equipment manufacturers, chip and device manufacturers and other industry chain of each link to bring tangible benefits, since November 2016 in Broadband Forum began to discuss, as the principles and direction, in the industry get more and more common. However, it is a long and complicated process to realize PON fusion. At present, the basic consensus is that it is difficult to change the research scope and operation mechanism of each standard organization. PON integration should be realized mainly through the bottom-up efforts of the members of the standard organization.

In order to promote PON integration, the next step is to carry out the work in both non-technical and technical aspects. Non-technical factors are more important, because there are not completely technical factors in the current two PON standard systems. Need to explore effective coordination between different standards organization of the specific mechanism, adopt various forms to gradually build consensus, elimination of PON fusion related concerns, push related standards organization in the new standards are conducive to the PON. In terms of technology, it is necessary to gradually converge the deployment time point, speed, link budget and coexistence of the next generation of PON between ITU-T and IEEE; At the same time, key problems such as single wavelength and multi-wavelength, speed of each wavelength, fixed or adjustable wavelength are analyzed, and the most suitable technical direction of the fusion PON is selected.

As China has become the largest PON market in the world, Chinese operators and manufacturers should play a bigger role in promoting PON integration. Held in the middle of July, 2017 IEEE 802.3 ca meeting, a joint proposal based on the Chinese operators, vendor and push, in 25 G, 50 G and 100 G EPON PON fusion has been widely supported, the time schedule of the standard of PON fusion target oriented has been adjusted, 50 G and 100 G EPON began to demonstrate the implementation of the way, PON fusion and a solid step forward.

Welcome to Visit C-Data at Convergence India 2018

January 24, 2018/in News /by C-Data

The 26^th Convergence India 2018

Venue: Pragati Maidan, New Delhi, India

Date: 07-09 March, 2018

Booth: Hall 11 C270

C-Data is a high-tech enterprise which is specialized in access network products, C-Data has accumulated many technologies in the field of access network for many years. The products can meet the demands of triple play in functionalities and performances. In this exhibition, we will show you GPON/EPON FTTx and PON + EOC solutions, the application of full range of products and technology.

Convergence India is an exhibition supported by India’s Ministry of Telecommunications, Information Technology Department and Ministry of Broadcasting and Information. It is India’s leading and largest telecommunications, broadcasting and television, Internet of Things, cloud computing, Digital Home, Cables & Satellite TV, Broadcasting of Smart Devices, Consumer Electronics Show, has been successfully held for 25 years since 1993 and has become the largest information and information exhibition in South Asia!

In 2017, there are over 800 exhibitors from over 30 countries and over 25,000㎡ exhibition space.

Most of the exhibitors come from India, China (including Taiwan and Hong Kong), the United States and so on. More than 20% of them are Chinese manufacturers. Many famous international companies have released the most advanced 3G, WiMAX, IPTV, digital cable, VoIP , Videotex services, IOTX and other new technologies or products, in addition to focusing on radio and television, smart products, virtualization and other products and attracted more than 20,000 industry participants.

We sincerely invite you to visit our booth again, On the way of expanding broadcasting market, C-Data is pleased to cooperate with you to develop the radio and television network and push forward the development of Information Technology.

C-Data 2018 New Year Party Achieved a Complete Success

January 23, 2018/in News /by C-Data

To welcome the coming of 2018, C-Data ceremoniously held “Awards Ceremony and 2018 New Year Party” in Nanrong Hotel on 20^th January, 2018. Invited guesses joyfully gather together with all C-Data staffs, with awarding, performing, tasting fabulous foods, drinking and hobnobbing, spent warm and happy time at this special night. Read more →

OLT deployment instructions

January 19, 2018/in News /by C-Data

With the development of telecom technologies and services, the high-rate services and applications such as video and data are increasingly enriched and the market competition is becoming increasingly fierce. In order to maintain the sustainable development of broadband access, meet the users’ demand for high-rate services, reduce maintenance costs and cope with market competition, China Telecom is actively implementing the strategic transformation of access networks, adopting new technologies, improving access bandwidth, and implementing broadband access Network upgrade, so as to fully realize by voice-oriented traditional basic operators to integrated information service provider’s business strategy transformation.

OLT deployment requirements

1. The deployment of OLT nodes should be centralized mainly to meet the coverage of integrated service area as the goal, combined with coverage, user distribution, pipeline resources, machine room installation conditions and other factors to determine, try to choose the center area of coverage, construction and maintenance convenience since Equity or long-term rental room, to ensure that the OLT node room location and long-term stability.

2.For areas in the integrated service area where there is no transmission or aggregation engine room or where one transmission convergence room in the area can not meet the service convergence requirements, the integrated access to the equipment room or the equipment room that uses the better conditions, solve.

3.The deployment of OLT devices should be deployed according to the principle of meeting the regional access requirements. For the purpose of predicting the service access needs within 1-2 years of the terrestrial service, you should give priority to the deployment of OLT devices (based on the device configuration and later expansion of the card according to the service requirements). The deployment principle is as follows:

a)Screening of its own transmission and convergence of equipment room, room conditions to meet the installation requirements of the engine room, according to business needs priority deployed 1-2 OLT equipment for the latter part of rapid business access for the reserve.

b)Screening suburbs transmission aggregation room, for the recent business needs of the engine room, but also give priority to the deployment of OLT equipment.

c)If there is no integrated service area where the equipment room and the OLT equipment room are converged, select an appropriate equipment room according to the service plan and install the OLT equipment to reserve the service for quick access.

OLT deployment method

There are two common OLT settings, one is centralized settings, one is decentralized settings.

Centralized setting means that one OLT device covers multiple user areas, such as residential areas, commercial areas, administrative areas and other user areas. This mode is mainly used in the construction of urban and township integrated service areas. The OLT equipment is placed in the computer room of the integrated service area and extended with trunk optical fiber cables to facilitate post-management and capacity expansion.

In a decentralized manner, the OLT is sinking into a single-user area and the user area is covered in a targeted manner. The OLT is mainly used in large-scale residential areas, clustering markets and dense rural areas. In this mode, OLT equipment is mainly used to sink to the base station equipment room of the area, and adopts the bare fiber connection to the PTN or OTN convergence layer. OLT equipment sunk deployment main application scenarios are as follows:

large area: for more than 3000 households in large residential area
Clustering Market: For industrial parks, commercial areas and other areas where more than 3,000 households are residents
Rural: For the township integrated business area is not covered by the remote and densely populated villages in the region

OLT technical options

1.Splitting ratio setting: Select GPON technology to build PON network. The OLT equipment configures Class C + optical module. The total splitting ratio of set-off and WLAN services does not exceed 1 × 32, and the width of house type is 1 × 64. The splitting level does not exceed two Level (8 × 8 or 4 × 16).

2.Calculation of attenuation: When OLT planning and deployment, the first calculation of optical fiber link loss, the furthest district or village in the region should meet the system requirements of optical fiber link loss.

The GPON Class C + optical module system allows the maximum channel insertion loss to be calculated at 32 dB for fiber link loss calculations (Class C ++ optical modules are available in rural areas where long-distance coverage is required and the maximum channel insertion loss is calculated at 35 dB ), The total splitting ratio of 1 * 64, no more than two levels of splitting, the attenuation and attenuation values as shown in the following chart and the following table:

Device	Optical splitter	Union (flange)	Direct melting point (connector box)	Optical fiber transmission	Maintain margin
Insert damage value	21 dB	0.5dB	0.1dB	0.4dB/km	2dB

3.PON port planning: In principle, group customers and home customers can mix OLT equipment, but the group customers and family customers use the PON interface board is recommended to separate.

FTTB and FTTH / O can be mixed in the same OLT. However, for the convenience of VLAN planning, PON ports used by FTTH / O and FTTB are recommended to be separate. That is, one PON port is only used for FTTH / O access, or only for FTTB LAN) access.

In order to save room space, increase access density, requires the use of 16 PON board.

4.Optical module on the joint choice: OLT fiber optic cable through the uplink connection based on the reasonable choice of 10KM, 40KM optical module.

OLT site requirements

OLT site selection should take into account security, the engine room, pipelines and fiber optic cable building economy, as well as the maintenance of convenience and other factors.

Urban OLT should be mainly deployed in the “integrated service access area” in the room, all the deployment of rack-mounted OLT equipment; rural areas should generally be deployed to facilitate the user access to a relatively stable 10GE PTN aggregation node, where the township base station and Rural base stations with contiguous broadband needs in rural areas deploy rack-mounted OLT devices and small-box OLT devices can be deployed in base stations equipped with insufficient room.

Compared with the base station service, the broadband access service is very sensitive to the interruption time. Especially when the OLT capacity of the office equipment is getting larger and larger and more and more customers are accessing the OLT service, the failure of the OLT will cause the large number of customers to directly withdraw from the service, affecting Customer perception. Therefore, the OLT deploying the equipment room must be set at a stable home, with good conditions in the equipment room, easy access to the optical fiber cables, and easy access to the equipment room by the maintenance personnel to avoid being located in the equipment room of the base station where the relocation is frequent.

Related Products

Gpon OLT：FD1504GS,FD1508GS,FD1616GS

Epon OLT: FD1104SN,FD1108S,FD1208S,FD1216S

The difference between Wireless AP and wireless Router

January 12, 2018/in News /by C-Data

Wireless AP, which is wireless access point. In simple terms is the wireless switch in the wireless network. It is an access point for mobile terminal users to enter a wired network and is mainly used for home broadband and intra-enterprise network deployment. The wireless coverage distance is tens to hundreds of meters. At present, the main technologies For the 802.11x series. A typical wireless AP also has an access point client mode, which means that APs can wirelessly link to each other so as to expand the coverage of the wireless network.

2018 HAPPY NEW YEAR

December 29, 2017/in News /by C-Data

Time flies, 2018 is coming.New year should be a time of banked-up fines, the scent of flowers and wine, good talk, good memories and loyalties renewed.

May the glow of new year candle fill your heart with peace and pleasure and make your new year bright. Have a love filled new year!

Merry Christmas

December 22, 2017/in News /by C-Data

May your Christmas be filled with special moment, warmth, peace and happiness, the joy of covered ones near, and wishing you all the joys of Christmas and a year of happiness.

——C-Data

C-Data is about to launch its new EDFA product

December 13, 2017/in News /by C-Data

The optical and electronic components of the machine aresealed and sealed ,and the unique heat dissipation design
Using 1+1 hot plug backup power supply
High gain, great power, up to 26dBm optical output
Single-stage or double-stage 980 nm and 1480 nm pump laser
Lower Noise Figure ≤ 5.0 dB @ 0 dBm optical input
Good reliability with MTBF 40years