L-2 GEPON System (Teracom)

Introduction to GEPON System

BRBRAITT, Jabalpur Page 1

L-2Introduction to GEPON System

(M/s Teracom)


1.0 Introduction

The GEPON system is new generation intelligent carrier-class EPON terminal equipment, launched by Fiber Home. The GEPON system’s functional positioning is as follows:

Used together with remote end ONUs as office end OLTs of FTTX solutions.

Supports broadband services, such as VoIP, TDM, IPTV, CATV and access to the internet.

The GEPON (AN5116-06A) system’s market positioning is as follows:

Carrier-class FTTX office end equipment with high density and high performance.

Provides solutions of fixed network broadband access, mobile base station transmission, E-business in business buildings.

The AN5116-06A’s position in the network is shown in Figure 1.

Figure 1: The AN5116-06A’s position in the network

As the above figure shows, the AN5116-06A is usually placed in the equipment room of residential community or central office. On the network side, the AN5116-06A provides GE or 10GE uplink port(s) for connecting to IP network, as well as STM-1 optical interface for connecting to SDH equipments. On subscriber side, the AN5116-06A provides subscribers with various services incorporated in a single fiber, such as data, VoIP, IPTV, CATV and TDM, via an ODN.

Functions and Features

2.1 Interface Types

The AN5116-06A offers a diverse range of physical interfaces, as shown in Figure 2.



Figure1: The AN5116-06A physical interfaces

The functions of the AN5116-06A’s interfaces are shown in Table 1.

Table 1: Interfaces of the AN5116-06A Equipment

Class Type Function

Uplink interface 10GE optical interface Provides 10GE Ethernet uplink optical interface.

Uplink interface GE optical interface Provides GE Ethernet uplink optical interface.

GE electrical interface Provides GE Ethernet uplink electrical interface.

STM-1 optical interface Provides connection to STM-1 optical interface of transmission equipment.

E1 electrical interface Provides connection to E1 interface of transmission equipment.

User interface EPON optical interface Provides EPON subscriber interface.

Management interface

FE interface / EMS interface

Supports out-band GUI administration

10GE / GE interface Supports in-band GUI administration

RJ-45 port (adopting RS-232 interface protocol)

Supports out-band local CLI administration.

Dry contact interface

RJ-45 port Enables collection of external environment variables that can be reported to the network management system



Class Type Function

External clock interface

Clock coaxial interface Provides input and output of E1 external clock and BITS clock.

Alarming interface

RJ-45 port Used to transport alarm signals of sub-rack to PDP.

3.0 Application Areas

3.1 Supporting triple-play

The FTTX system adopts WDM technology to incorporate CATV signals and subscribers’ data and voice service, transmitting through a single fiber by placing a passive optical multiplexer outside the AN5116-06A, to achieve Triple-play function.

3.2 Supporting FTTH

The AN5116-06A supports Fiber To The Home (FTTH) to deliver high-band service to subscribers’ houses.

3.3 Supports refurbishment of antiquated copper plant

The AN5116-06A can guarantee access of voice and data services by introducing optical feeds to the existent copper LAN network via FTTB, when

3.4 Supports delivery of broadband services to both rural and urban neighborhoods

When the AN5116-06A is used together with AN5006-20, it can provide relatively high bandwidth, ensure access of voice and data services, adapt to the access condition of densely populated areas, and fully meet current and future communication requirements of rural subscribers.

3.5 Supporting mobile base station traffic transmission.

The AN5116-06A provides two kinds of TDM interface cards that provide E1 electrical interface and STM-1 optical uplink interface respectively. When it is used together with AN5006-06A-A or AN5006-20 (equipped with TDM card), TDM signal of mobile base station can be uplinked to transmission equipment to achieve TDM emulation function.

4.0 Powerful EPON Access Ability

Supports EPON function defined in IEEE 802.3-2005 standard.

Provides EPON transmission with large bandwidth capacity:

Upstream rate: 1.25 Gbit/s;

Downstream rate: 1.25 Gbit/s and 2.5 Gbit/s.

Possesses a high splitting ratio of 1:64, which improves capacity, conserves fiber consumption, and facilitates network reach

Supports DBA algorithm: The minimum configurable bandwidth of the DBA is no more than 256 kbit/s; the minimum bandwidth allocation granularity of the DBA is in steps of 4 kbit/s; the accuracy of the DBA is better than ±5％.



Supports long-distance transmission. By adopting PON technology, the long-distance coverage problem of twisted pair cable access technology is solved. The maximum transmission distance (PON+ twisted pair cable) can be more than 20 km.

Supports various kinds of ONU, such as SFU, cassette MDU (including LAN type and XDSL type), shelf-based MDU and HGU ONU.

Supports extended OAM function.

4.1 Multicast Functions

The AN5116-06A features a point-to-multipoint PON network structure, and supports multicast protocol. Using multicast, new value-added service can be easily supplied to subscribers, such as live online, network radio, network TV, remote medical care, remote education and real-time video meeting.

Supports IGMP V2 / V3 protocol.

Supports IGMP Proxy protocol and IGMP Snooping protocols.

Each sub-rack supports up to 4k concurrent multicast groups.

Supports pre-join function which enables joining pre-configured multicast group by automatically send joining message upstream.

Supports preview function, including 5 preview parameters: maximum time for a single preview, preview count allowed, preview interval, auto or manual reset of preview authority and total preview time.

Supports fast leave function.

Supports multicast cascade.

Support cross-VLAN multicast.

Supports management and identification of subscribers and program sources based on multicast VLAN.

4.2 NGN Voice Functions

The AN5116-06A supports using ITU-T H.248, MGCP and SIP to achieve NGN voice functions. It uses the ONU to access voice services and uses standard speech encoding technology to convert voice signals into digital signals which are then transported to an IP network in IP packets via the OLT. Call control is achieved by a soft-switch or IMS which provides VoIP access for analog subscribers, meeting the requirements of carrier-class speech quality, management and operation.

4.2.1 Realization of NGN voice service

Supports ITU-T H.248, MGCP and SIP protocols to a softswitch to achieve NGN services.

Supports SIP protocol to an IMS to achieve NGN services.

4.2.2 NGN voice functions

Provides 112 testing.

Supports multi-MGC list.



VLAN of each voice channel supports IEEE 802.1q and PRI setting.

Supports Q-in-Q encapsulation for voice services.

Call processing capability is 25k BHCA.

Percent of call completed is larger than 99.999%.

4.2.3 NGN voice services

IP phone access for POTS subscribers.

T.30 / T.38-based FoIP.

Transparent transportation of MoIP.

Pulse accounting and polarity-reversal accounting.

IP CENTERX service.

Supplementary services, intelligent services and user-defined services assisted by the soft switch are:

Calling number identification (CNID) presentation and restriction.

Call waiting.

Three party service.

Alarm clock service.

Call forwarding (unconditional, busy and no answer).

Immediate hotline.

Outgoing call blocking.

Distinctive ring.

4.3 TDM Emulation Functions

The AN5116-06A provides E1 circuit emulation based on RFC 5086 (CESoPSN). The AN5116-06A is equipped with CE1B card and C155A card which respectively provides E1 electrical interface and STM-1 optical interface for uplink connection. The AN5116-06A has a CES protocol processor built in to translate between TDM format and Ethernet packet format.

Upstream direction: accesses Ethernet packets from the ONU side via EPON / GPON service card, and after they are processed by core switching card, delivers them to CE1B / C155A card for protocol translation and transforms them into E1 or STM-1 format to continue upstream to the SDH network.

Downstream direction: the CE1B / C155A card transforms of E1 / STM-1 TDM traffic from the SDH network into Ethernet packets and distributes these to the ONUs, which then restores the original E1 TDM traffic flow. Thus multiple TDM services like mobile base station backhauling and E1 private line can be realized.

TDM emulation functions supported by the AN5116-06A are as follows:

Supports two uplink interfaces: STM-1 interface and E1 interface.

Supports TDM service using CESoPSN.



Supports asynchronous clock mode and synchronous clock mode.

Supports network management selection of the clock type: clock extracted from E1 line and clock input on external clock interface of TDM card. There are four clock types to be chosen via network management system.

4.4 Q-in-Q VLAN / VLAN Stacking Functions

VLAN, also named virtual LAN, is an end-to-end logic network built by network management software which could go across different network segments and networks based on switching LAN. The basic VLAN standard is IEEE802.1q. IEEE802.1ad adds VLAN stacking, also called Q-in-Q VLAN, and is based on IEEE802.1q. Its core concept is to encapsulate the VLAN tag of user’s private network in a VLAN tag of public network so that the user’s traffic crosses the provider’s backbone network with two layers of tagging, which provides users with a relatively simple double-layer VPN tunnel. This achieves transparent VLAN tag transport, i.e. the user’s VLAN and the service provider VLAN are independent of each other, effectively solving VLAN ID addressing space limit of 4k addresses.

Q-in-Q VLAN functions supported by the AN5116-06A are as follows:

Supports VLAN number extension: by adding Q-in-Q VLAN, the number of VLAN is increased to 4096×4096 on the basis of existing VLANs.

Supports selected Q-in-Q: the system can add inner, outer VLAN based on the value of source MAC address, destination MAC address, source IP address, destination IP address, L4 source port No., L4 destination port No., Ethernet type, inner VLAN ID, outer VLAN ID, service type, time-to-live, protocol type, L1 CoS, L2 CoS.

Supports subscriber and service differentiation through VLANs.

Supports setting subscriber’s S-VLAN based on card, PON port, ONU.

Supports selective Q-in-Q for one port, i.e. some services use stacked VLANs, whereas other services still use single VLAN.

4.5 Flexible VLAN Translation Function

VLAN translation means access layer equipments transform VLAN tags labeled by users into unique network-side VLAN tags. This can reduce carriers’ maintenance workload and protect convergence layer network and core network.

The VLAN translation function provided by the AN5116-06A can be in one of the following three forms:

1:1 translation: non-convergence. Under this mode, VLAN translation of upstream and downstream data traffic is done only by translation of the VID value.

N:1 translation: VLAN convergence function, i.e. converges a number of upstream VLANs (e.g. VLAN 1, 2,…, N) into a unique network-side VLAN ID; and remaps it into corresponding multiple VLANs in the downstream direction.

Hybrid translation: supports hybrid use of 1:1 VLAN translation and N: 1 VLAN convergence.

4.6 Card protection function



Supports 1:1 active / standby switching function of core switching card, to make seamless switching. After switching of core card, the configuration of upstream interface does not need to be changed, which greatly facilitates the user’s maintenance and management operations.

Supports 1+1 active / standby protection function of uplink interface card, Trunk protection and dual-homing protection of uplink interface:

When uplink card is set to be 1+1 active / standby protection, two interfaces of uplink card are one-to-one protected. If GU6F is used as uplink card, the equipment can provides maximally 6 GE uplink interfaces; if HU1A is used as uplink card, the equipment can provide maximally 4 GE uplink interfaces and one 10GE uplink interface. If HU2A is used as uplink card, the equipment can provide maximally 2 GE uplink interfaces and two 10GE uplink interfaces.

When uplink interfaces are set to Trunk, the bandwidth of uplink interface can be extended and load equalization is finished automatically. Once an interface of Trunk group fails, the flow of this interface is automatically shared between other interfaces of this Trunk group. 12 GE uplink interfaces could form maximally 6 Trunk groups and each Trunk group could supports maximally 12 member interfaces. A Trunk group of two 10GE uplink interfaces can be provided too.

When the uplink interfaces are set to dual-homing protection, two uplink card interfaces are connected to two diversely routed optical facilities, forming inter-system backup method and achieving load sharing. When one system of the two is found to be in failure, the other system could take over its entire traffic to ensure traffic remains unblocked.

Supports inter-card protection of the TDM card: the TDM card can be configured to function independently or support 1:1 protection.

4.7 PON chip-level protection

Supports arbitrarily designating a PON MAC chip to be 1:1 protected. It can control the switching of the PON MAC chip when a Loss of Signal is detected on the optical module by hardware.

4.8 Power supply protection

Two power supply cards work in dual-power input and protect against reverse polarity connection. The power supply cards support a distributed power-fed mode and all powered cards are fed with power independently. Any fault in one card doesn’t influence other cards. This greatly improves equipment reliability and stability.

4.9 Fan protection

The system uses fans for cooling. There are indicators on the fan units which indicate the fan running status and the fan speed is adjusted automatically. The three fans are installed independently, achieving easy maintenance.



5.0 Networking Introduction

The AN5116-06A is suitable for FTTH / FTTB application. Usually, it is placed in central office. The AN5116-06A’s networking sketch map is shown in figure 3.

Figure 3: The AN5116-06A networking

6.0 Application as per Technologies

6.1 Application to Q-in-Q VLAN

The AN5116-06A supports Q-in-Q VLAN function. By setting Service-VLAN on the basis of Customer-VLAN, the VLAN number can be extended and thus the VLAN resource



bottleneck can be removed. Meantime, subscriber separation and unique identifier can be realized by Customer-VLAN and service distinguishing can be realized by Service-VLAN.

The networking figure for the AN5116-06A application to Q-in-Q VLAN is shown in Figure .

Figure 4: The AN5116-06A application to Q-in-Q VLAN

On subscriber side of the AN5116-06A, two subscribers’ data and voice services are labeled with Customer-VLAN tag via ONU. Customer-VLAN tags for data and voice services accessed by ONU1 are respectively 1001 and 2001; and Customer-VLAN tags for those accessed by ONU2 are 1002 and 2002. When two subscribers’ services are uploaded to the AN5116-06A via ONU, they are labeled with Service-VLAN tags according to the different types of data and voice services. The Service-VLAN tags of data and voice services are 1 and 2 respectively. When Q-in-Q VLAN is added, those subscriber services with double VLAN encapsulation are uploaded to upper network.

When those successfully configured subscriber services with Q-in-Q encapsulation are downlinked from upper network to the AN5116-06A, if the VIDs of Service-VLAN tag messages of the services are not consistent with the VIDs configured, the messages will be discarded; if the VIDs of Service-VLAN tag messages of the services are not consistent with the VIDs configured, the Service-VLAN tag will be stripped directly and forwarded to the ONU of downlink equipment. In the same way, the equipment judges on the ONU the consistency between the VIDs of Service-VLAN tag messages of the services and the VIDs configured. If yes, it strips Customer-VLAN tags and transport the service packets to subscribers, or else it discard the messages.



6.2 Application to VLAN Translation

VLAN translation is also named VLAN mapping. When various service flow of subscriber side goes through terminal equipments supporting 802.1q (take HG as the example through the whole document), supposing HG label subscriber services with fixed tags, for the tags labeled by HG could be out of the valid range defined by operators, the ONU will strip the default tags labeled by HG and label valid tags when services are uplinked to the ONU. Then the VLAN translation is finished.

VLAN translation includes two types of translation which are 1:1 VLAN translation and N:1 VLAN translation. N:1 VLAN translation can converges several VLAN into one valid VLAN.

Figure 5: 1:1 VLAN translation

On subscriber side of the AN5116-06A, subscribers’ data, voice, and multicast services go through gateways and are labeled with different default VLAN tags respectively which are 100, 200, and 300. When subscribers’ services are uplinked to ONU, and are performed with 1:1 VLAN translation on ONU, the Customer-VLAN tags of data, voice and multicast services are 500, 600, and 700 respectively. When the services are uplinked to the AN5116-06A, they are labeled with Service-VLAN tags which are 3000 on the AN5116-06A. When the labeling of Q-in-Q VLAN is finished, those subscriber services with double VLAN encapsulation are uplinked to upper network. The performance of VLAN translation can achieve distinguishing of subscriber services on network side and reduce maintenance work and overhead of VLAN resource because only one SVLAN is needed for a system.



Figure 6: N:1 VLAN translation

On subscriber side of the AN5116-06A, subscribers’ data, voice, and multicast services go through gateways and are labeled with different default VLAN tags respectively which are 100, 200, and 300. When subscribers’ services are uplinked to ONU, and performed with N:1 VLAN translation on ONU, the Customer-VLAN tags of all subscriber services are 500. When the services are uplinked to the AN5116-06A, they are labeled with Service-VLAN tags which are 3000 on the AN5116-06A. When the labeling of Q-in-Q VLAN is finished, those subscriber services with double VLAN encapsulation are uplinked to upper network. The performance of VLAN translation can achieve distinguishing of subscriber services on network side and reduce maintenance work and overhead of VLAN resource because only one SVLAN is needed for a system.

Figure 7: VLAN translation hybrid mode

Hybrid mode is consisted of 1:1 VLAN translation and N:1 VLAN translation. On subscriber side of the AN5116-06A, subscribers’ data, voice, and multicast services go through gateways and are labeled with different default VLAN tags respectively which are 100, 200, and 300. When subscribers’ services are uplinked to ONU, and performed with 1:1 VLAN translation and N:1 VLAN translation on ONU, the Customer-VLAN tags of data and multicast



services are 500, and the Customer-VLAN tags of voice service are 600. When the services are uplinked to the AN5116-06A, they are labeled with Service-VLAN tags which are 3000 on the AN5116-06A. When the labeling of Q-in-Q VLAN is finished, those subscriber services with double VLAN encapsulation are uplinked to upper network.

6.3 Application to IPTV Service

On Internet, such multimedia services as stream media, video meeting and digital TV, are becoming an important constituent part of information transmission. However, point-to-point unicast is not suitable for them because of their transmission feature which is point-to-multipoint. If point-to-point unicast mode is used, servers must provide each receiver with an IP message duplicate copy and the same messages will be repeatedly transmitted in the network. It will occupy lots of network resource. Although IP broadcast allows one host to send one IP message to all hosts in the same network, yet not all hosts need this message. Therefore, much network resource is wasted. Multicast technology is born under such a circumstance. It allows one host to send one copy of a multicast frame to multiple dedicated receivers.

The AN5116-06A transmits multicast service in SCB+IGMP mode, and performs multicast service control and management via multicast control message. See figure 8 for the AN5116-06A application to multicast service.

Figure 8: The AN5116-06A application to multicast service

The AN5116-06A supports IGMP Proxy / Snooping. The AN5116-06A works in IGMP Proxy mode and ONU works in IGMP Snooping mode. When OLT receives IGMP join message sent by a certain subscriber, it captures this message and performs authorization. If the multicast group to join doesn’t exist in the multicast forward table of OLT, OLT will send an IGMP



joining request to multicast server and create this group in its table; if the group has already existed in its table, OLT will directly add the subscriber to its table and set correspondence relationship between multicast service and the subscriber.

Users can choose to disable the AN5116-06A’s IGMP Proxy function. In this case, multicast messages will be broadcast to all EPON interfaces and all ONUs.

The AN5116-06A also supports controllable multicast function. Because IGMP Proxy / Snooping doesn’t include subscriber authentication, subscribers can join or leave a multicast group at will. And the operators cannot charge subscribers. To solve these problems, the AN5116-06A controls and manages the access of subscriber multicast service, and performs subscriber multicast information recording and statistics, and controls and manages multicast program sources. This could effectively prevent protocol attack, illegal multicast sources, illegal rebroadcasting, and illegal receivers, so as to guarantee operators’ benefits.

6.4 Application to VoIP Service

The AN5116-06A supports VoIP function. First connect a plain telephone to RJ-11 port of an ONU. After the voice service is accessed, perform compression encoding to voice signals via speech compression algorithm to achieve analog-digital translation. Then transform voice data in packet to IP network in real time via OLT. The call control is realized by soft-switch equipments. At meantime when the receiving end receives IP data, these IP data are restored to original voice signals through corresponding decoding and decompression.

The AN5116-06A supports MGCP, H.248 and SIP, and its soft-switch interface is perfectly connected to MGC gateways produced by various mainstream manufacturers. See figure 9 for the AN5116-06A application to VoIP voice service.

Figure 9: The AN5116-06A application to NGN voice service

6.5 Application to CATV Service

The CATV signal source produces CATV signals independent of the AN5116-06A. According to the density of CATV signal source, the signals are amplified and split to different



paths at transmission end and then incorporated with the AN5116-06A’s EPON signals in a single fiber for transmission by adding a multiplexer outside using WDM theory. Then CATV signals are demultiplexed by demultiplexer on remote end ONU. Users can connect TV set to RF interface of ONU to get accessed to CATV service. See figure 10 for the AN5116-06A application to CATV service.

Figure 10: The AN5116-06A application to CATV service

7.0 Application to Situations

7.1 Application to Business Buildings

Users in business buildings have relatively higher ARPU (Average Revenue Per User) and more concentrated locations. They occupy an important position in operators’ competition.

Incorporating voice, data, TDM service and video service, the AN5116-06A is the best choice for business building users. It can provide users with the following services.

1. Broadband data access: Ethernet interface based;

2. Voice service access: plain old telephone service based, also via some intelligent terminals (with Ethernet interfaces);

3. Video service access: coaxial cable interface based CATV service or Ethernet interface based IPTV service;

4. Private line service access: TDM based E1 private line access.

In the application to business buildings, the AN5116-06A can connect SBU (Single Business Unit) ONU and MDU ONU. MDU ONU can be further subdivided into types such as LAN, xDSL and card types. See figure 11 for more information about application to business buildings networking.



Figure 11: The AN5116-06A application to business buildings

As shown in above figure, it is recommended that Fiber to the Office (FTTO) is adopted in newly-built business buildings. If users only need data or telephone service, AN5006-04 is recommended as ONU. And if TDM private line service is needed additionally, AN5006-06A-A or AN5006-20 (equipped with TDM card) is recommended as ONU and at the meantime the AN5116-06A also need to be equipped with TDM card. For those business buildings that have already built a LAN or telephone line network, it is recommended to adopt LAN, xDSL, or shelf-based MDU to upgrade current network or equipments to save costs. AN5006-07 / 09 / 10 is recommended as ONU for LAN MDU; AN5006-20 is recommended as ONU for shelf-based MDU.

7.2 Application to Intelligent Residence Communities

Intelligent residence communities use modern information network technologies to construct a broadband information service access platform. This platform can receive, transmit, collect and monitor all kinds of information completely, real-timely and effectively. With EPON application to intelligent residence communities, more and more families can obtain information



via broadband access network. The information service is diversified, becoming more and more comprehensive and layered. Currently, the information services mainly include family information service, residence house automation, public service and property management service, such as remote meter reading, building interphone, public facilities management, exit and entry control, public broadcast, resident archives management, fee charging and automatic accounting of three meters (i.e. water, kilowatt hour and gas meters). All these services are accessed to property management servers by the AN5116-06A and performed by service providers of the property company.

Newly built residence communities can use FTTH mode. For old communities or the communities not supporting FTTH, ONU can be placed in the aisles or in the equipment room. That is to adopt LAN, xDSL or shelf-based MDU for networking to save costs. AN5006 / AN5506-07 / 09 / 10 is recommended as ONU for LAN MDU; AN5006-20 is recommended as ONU for shelf-based MDU. See figure 12 for the AN5116-06A application to intelligent residence communities in FTTH mode.

Figure 12: The AN5116-06A application to intelligent residence communities

To meet the intelligent residence requirements on door-entry control, fire fighting, room temperature, supply voltage and smoke alarms, ONUs used together with the AN5116-06A provide dry contact interfaces connecting external monitoring equipments. When a dry contact interface detects environment alarms, it will instantly report to network management system to remind users, so as to meet users’ integrated service requirements.

7.3 Application to Internet Bars

In Internet bars, the access rates are typically 10 Mbit/s, 20 Mbit/s and 100 Mbit/s, and the service types are simple, based on high-rate Internet private line access, plus some possible voice service. Internet bars usually spread around. They require a network system with strong covering capability. Therefore, fiber access becomes the first choice for most Internet bars.

With data and voice access, as well as excellent OAM features, the AN5116-06A fully meets the requirements of “one network, two bars” (Internet bar + phone bar). It satisfies the requirement to obtain high-rate Internet private line service and voice service through a single



fiber, and performs uniform management by the same network platform. See Figure for the AN5116-06A application to Internet bars.

Figure 13: The AN5116-06A application to Internet bars

As shown in the above figure, multiple Internet bars’ services are accessed into the AN5116-06A via a splitter. Each Internet bar is equipped with one ONU. Each ONU executes data and voice service access for Internet bar.

7.4 Application to City Security Monitoring Project

City security monitoring project is a huge and comprehensive management system. It not only meets public security management, city management, traffic management and emergency management requirements, but also meets video monitor requirements of disastrous accident early warning and safety production. Furthermore, it takes into account the integration of alarm-reporting and door-entry control system, as well as the interconnection with broadcast system.

During the safety city construction, “digital monitoring” is a key factor. Because lots of digital video recorders are spread around the city, longer distance transmission and line resource saving are required. The video signals from video recorders to monitoring center need 1Mbit/s or more bandwidth. If EPON system is used to access digital monitoring service, the above requirements can be well satisfied. See Figure for the AN5116-06A application to city security monitoring project.

As shown in the figure, ONU is placed in the monitor point; the encoder and hard-disk video recorder are connected to ONU via Ethernet interface and they perform compression encoding to the collected real-time images which is then uplinked to the AN5116-06A. The AN5116-06A is placed in supervision center room and connected to network matrix host in supervision center via uplink interface. It views the uplinked images in real time and meanwhile performs video recording 24 hours a day, which keeps data information for functional departments for city management, in case of information processing and application afterwards. Besides, because of the access of alarm-reporting supervision system, when there is an alarm, the corresponding alarm information will be transported to alarm-reporting command centers of



different levels to make sure police gets incident information at first time, so as to safeguard public security.

Figure 14: The AN5116-06A application to city security monitoring project

This solution not only supports digital monitor and control, but also provides voice service. It sends both video and voice signals from each monitor point to the monitor center. It facilitates real-time communication with public security and fire fighting departments in case of emergency. AN5506-03 is recommended as ONU to support the AN5116-06A’s application to city security monitoring project.


Documents

L-2 GEPON System (Teracom)