Ftto+lan wiring solution for new high-rise office building

With the development of commercial Office intelligent Building, in the network is not only the increasing demand for bandwidth, but in the face of endless network business, so the office building Yu on the network integrated access ability requirements have been improved. and the traditional building wiring scheme is not good enough to meet the needs of high-rise office buildings for integrated access network. There are a lot of active devices such as switches in the traditional network structure. Cause the floor distribution has too many source nodes, and these active nodes are mostly placed in many dust, poor heat dissipation wells or floor wiring between, very easy to crash, overheating and other failures, resulting in maintenance and management costs higher The network management function of the access switch is simple, and the security and manageability of the internet is also poor. Therefore, we can consider the appropriate reduction of active nodes, explore the use of high bandwidth transmission capacity of PON (passive optical network) passive optical network to the LAN cabling technology for high-rise office building network integrated design.

Technical features based on PON technology

The PON system consists of optical circuit terminal (OLT), Optical Network Unit (ONU) and optical distribution network (ODN), which uses topological structures with dots to many points. Passive refers to all of the passive devices and optical fibers from Olt to ONU, and does not require any power source equipment. Pon All Optical Network has three networks in one business capacity, the same fiber in different wavelengths can carry different signals simultaneously transmission voice (VoIP), data and video services (IPTV or CATV). Pon technology is the first choice to achieve FTTx, and FTTx according to the light node and the number of households and distance, mainly divided into optical fiber to the Home (FTTH) fiber to the building (FTTB), Fiber to the junction box (FTTC), fiber to the Office (FTTO), Fiber to the Desktop (FTTD). Taking into account the current user terminal computer does not universal Optical network card, or to RJ45 copper network card, not in place to achieve FTTD. Therefore, the Ftto (Fiber to the Office) +lan (local area network) is undoubtedly one of the most highly feasible solutions for high-rise office buildings.

Optical fiber to office building Ftto use point to Multi Point (P2MP) tree branch network topology, scalability is good, reduce the backbone of fiber convergence equipment input, can make high-rise office buildings, single or multiple commercial users share the backbone of optical link. Because each business user's business capacity is also not fixed, so the specific according to the needs of business users tailored, networking is very flexible. This not only enhances the network many business the ability, also saves the backbone optical cable. Ftto can use EPON (Ethernet passive optical network) or gpon (Gigabit passive) access technology. EPON can not only realize the existing CATV, data, voice applications, but also compatible with such as digital television, VoIP, videoconferencing and other business. EPON technology is a bandwidth PON technology based on Ethernet frame structure and TDMA mode. Epon supports the symmetric rate of 1.25gbit/s, which supports up to 64 ONU per Epon Olt interface. GPON Technology supports TDM, MSTP, QINQ access networking technology, in addition to Epon can provide multimedia video and audio services, but also for these services to provide the corresponding QoS guarantee. GPON supports an asymmetric rate of uplink 1.244gbit/s and downlink 2.488gbit/s, which supports up to 128 Olt per GPON ONU downlink port. GPON is superior to epon in performance, has higher bandwidth, supports a higher ratio of light, provides better QoS and more maintenance management functions. Comparatively speaking, gpon is more suitable for high-end business users in business offices.

Using PON technology Wiring case analysis

Case building for high-rise buildings, building 46 floors high. From the 2 floor to the 46 floor are leased commercial floors. Each business user's business capacity is different, and the bandwidth requirements are not the same. With Ftto+lan access, each business user can use a single ONU, or multiple business users to use a ONU together. The network topology of the networking mode is as follows:

Figure I: Ftto+lan network topology Map