Access Network Planning and Technologies Part1 structure of Access Network

Conception of Access Network Access Network(exchange) is the subscriber part of the telecommunications network. The basic idea of telecommunication is the exchange of information. Voice text data image video

If you are a telecommunications service provider and you have set up you first switch. You just need to link the customer premises equipment(CPE) to you witch with a pair of copper conductors. Simple interconnection of subscribers to exchange

Structure of the Access Network PCPSCP DP1 DP2 DP3 EXCHANGE To other SCPs 400 pairs 2000 pairs

Part2 New Technologies in the Access Network

Limitation of the copper network limited bandwidth and there are problems in overcoming. Inflexibility: both in time and types of service provisioning. Reliability is limited. Installation time is long. Possible cable damages and maintenance costs were high. Difficult to manage Loop length limitations(~ 5km) Has problem of security Uneconomical in remote Prone to electromagnetic interference

New technologies in the copper Access Network Name Meaning Data Connection Distance Application Rate type to exchange DSL Digital 160kb/s Symmetrical ~5 km ISDN series, voice, Subscriber data communication line HDSL High Data 2Mb/s Symmetrical 4-5km No POTS, E1, LAN/ Rate Digital WAN, Internet Service Subscriber line access SDSL Single Line 2Mb/s Symmetrical 3-4km Same as HDSL+POTS Digital Sub- Work at home, scriber line internet access ADSL Asymmetric Downstream Asymmetrical 3-6km Internet access, video on d- Digital Sub- 2-8Mb/s, Up- emand, remote LAN access scriber line stream 128kb/s-768kb/s interactive multimedia VDSL Very High Downstream 13- Asymmetrical km Same as ADSL Data Rate 52Mb/s, HDTV Digital Sub- Upstream 1.5- scriber Line 2.3Mb/s

Fiber based new technologies in the Access Network Methods of deployment of fiber Fiber to the Curb(FTTC) Fiber to the Building(FTTB) Fiber to the home/office(FTTH/FTTO) Fiber in the loop architectures Point-to-point Point-to-multipoint/star Tree Ring

Technological options 1. PDH(plesiochronous digital hierarchy) fiber optic cabinet PON(passive optical network) AON(active optical network) 2. SDH(synchronous digital hierarchy)

Basic PON system components OLT(optical line terminal) Splitter ONU(optical network unit)

Typical implementation of PONs Management Switch OLT ONU Splitting up to 32 Capacity: 4B-120B Capacity: OLT 1920B, PON 480B Up to 4 PONs B: 64Kb bearer channel

Advantages of PON/AON Sharing of fiber and equipment as in case of PONs Increase in range at the cost of an additional active component(splitter) High flexibility in structures Higher capacity Management

Future of PON systems ATM-PON(APON): One fiber is passively split up to 64 times. Serve more customers. Can savings 20%-40% over circuit based access systems.

Future of PON systems ATM-PON(APON): One fiber is passively split up to 64 times. Serve more customers. Can savings 20%-40% over circuit based access systems.