FTTH Cabling Concept in a Korean MDU and Expansion to OSP
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1 FTTH Cabling Concept in a Korean MDU and Expansion to OSP
2 What is Air-Blown System? Why Microduct for FTTX? 35km away f. Seoul 72,727m 2 lot area 14 buildings 18~29 stories 1,382 houses Premium FTTH grade
3 Known as the Emblem system Korean government certifies Residential/office buildings for broadband service acceptance Only for new MDU and office buildings MDU: Multi Dwelling Unit Emblem for the Premium grade
4 Started from May 1999 by MIC(now KCC) 3.4M houses certified by level grades for MDU Premium grade(17%) 1st grade(54%) 2nd grade(22%) 3rd grade(7%, abolished) MIC: Ministry of Information & Communication KCC: Korea Communication Commission Emblem for the1st grade
5 Driving force for the infrastructure investment for broadband services Better pricing for new MDU with higher reputation Motivation toward upgrade of existing buildings Nameplate and the certified apartment, Gimpo Jayeon & Hill State
6 Minimum requirements for Premium grade(excerpts) 4 core fiber per each house with FDF 4 pair x Cat5e wiring for Data, 4 pair x Cat3 for Voice TPS for each building with more than 2 ducts Dedicated MDF room for the lot Source: Homepage of the certification authority, KCC
7 Cable route and MDF location MDF locates in the 1 st floor of #707 building DI 7way 5/3.5 microduct to each building axis Total cable laying length is 8,400m
8 7way 5/3.5 DI from MDF to each building axis 3 tubes for each BSP of KT, SKT & LGU+ 1 tube for CCTV surveillance 3 tubes reserved 4 core ABF with G.652.D blown by each BSP Each BSP utilizes a dedicated tube for service BSP: Broadband Service Provider 4 core ABF 7way DI microduct
9 Each building has 2 or 3 elevator axis 4 or 6 houses per floor Cabling is separated by lower and upper zone Elevator Axis -> IDF -> Building with 3 axis Lower zone covered by one IDF Building with 2 axis
10 Total 14 buildings 10 buildings with 2 axis, 4 buildings with 3 axis 32 axis = 10 x x 3 Each axis needs 2 IDFs For lower and upper zone each 64 IDF = 2 x 32 Bird s eye view of the apartment
11 2 kinds of IDF in TPS Each BSP s IDF connected from MDF with ABF Connection to each house is done in axis IDF Axis IDF 1 : 1 wiring to each houses in the zone Inside of Axis IDF BSP s IDF
12 KT SKT About 50% of houses in service coverage About 30% LGU+ About 30% Based on these expectations, they supply necessary equipment and infrastructure
13 Racks BSPs install racks to accommodate OLT and termination KT has1 more rack for POTS multiplexer Microduct 7way 5/3.5 DI 32 cables terminated Each BSP occupies assigned tube for ABF blowing Extension from DI end to each BSP s rack is necessary (below the access floor) POTS: Plain Old Telephone Service Racks in MDF room
14 Dasan V5724G(specification) GE-PON with max. 64 ONUs support per port Max. 11 PIUs with 2 ports each(max. 22 ports per chassis) 2 shelves with 10 PIUs installed in a BSP s rack 40 ports = 2 chassis x 10 PIUs x 2 ports 26 ports to splitter inputs are active, remaining14 ports reserved PIU: Plug-In/Port Interface Unit Dasan V5724G GE-PON System
15 1 st splitter s input port follows OLT s PIU port Total 26 pcs of 1 st splitter installed 18 pcs of 1:2 splitter 8 pcs of 1:4 splitter 68 branches = 18 x x 4 1:4 splitter
16 Splitter input ports go to PIU port of OLT ABF termination follows 1 st splitter s output port Splitter output ports go to 2 nd splitters input in IDF of each building via ABF 68 branch 64 IDF = 4 branches reserved Shelf for fiber termination
17 32 axis for all buildings 32 times blowing 128 core termination needed = 32 ABF x 4 core Each 2 nd splitter in IDF needs only 1 fiber input, so 64 cores active = 32 axis x 2 splitters in each axis Remaining 64 cores reserved Shelf in MDF 4 core ABF through 5/3.5mm tube Inside building IDF (1 ABF bundle per axis)
18 No. of SC/PC adaptor in splitter shelf 94 pcs = 26 splitter input + 68 splitter output No. of SC/PC adaptor in ABF termination shelf 128 pcs = 32 times blowing x 4 core ABF Min. 6 splice trays needed(24 core accommodation each) SC/PC adaptor Splice tray Shelf with adaptors
19 No. of patch cord for splitter input 26 pcs Patch between OLT and splitter input No. of patch cord for splitter output 64 pcs Patch between splitter output and active fiber in ABF No. of pigtail for termination of ABF 128 pcs = 64 jumper cords 128 fusion splice needed SC/PC jumper cord SC/PC pigtail
20 Tube extension from 32 x 7 way DI cable to rack By 1 way 5/3.5 DI or primary tube Better protection with sheathed cable Binding of tubes into termination shelf Bind with cable tie at rear side of shelf Enough space for ABF bend radius and protection is needed 1 way DI cable Rear side of shelf
21 BSP s IDF fixed on the wall Each BSP installs exclusive IDF Each BSP blows exclusive ABF Axis IDF installed for service distribution Hybrid fiber cable terminated for 1:1 connection into every house 2 SM + 2 MM adaptors for each house Axis IDF with SM/MM adaptors BSP s IDF
22 2 core single + 2 core multi mode in a sheath Single mode for broadband delivery(1 core active) Multi mode for CCTV(1 core active) No. of adaptor/pigtail/splice in axis IDF (2 core SM + 2 core MM) x No. of houses in the zone SC/PC Dual type single mode adaptor SC/PC Dual type multi mode adaptor SC/PC multi mode pigtail
23 Fiber assignment 4 core ABF arrived to each axis 2 core assigned for lower IDF, 2 core for upper IDF 1 core active each Active core goes to 2 nd splitter input port Remaining 1 core reserved In BSP s IDF
24 Relay of 2 core fiber to upper IDF By 4 core conventional loose tube cable (only 2 core spliced) Microduct with ABF combination is better (e.g. 5/3.5 DI or LSZH with 2 core ABF) ABF arrived at lower IDF Conventional cable for relay
25 2 nd splitter accommodated 1:8 or 1:16 Split ratio depends on the No. of houses in the zone 4 core ABF terminated 2 core should be relayed to upper zone Relayed cable terminated Only 2 core splice needed <-2 nd splitter outputs <-2 nd splitter input BSP s IDF in TPS
26 No. of fiber termination in lower IDF 2 core ABF termination 2 core fusion spliced for relay No. of fiber termination in upper IDF 2 core conventional cable termination No. of adaptors in each IDF 1 for input port + No. of branches 1:8 splitter
27 No. of broadband service port No. of 2 nd splitter branch port No. of patch cord for service initiation 1 jumper cord per house(wdm PON) Connection to the assigned port(=house) in axis IDF upon subscriber demand WDM concept
28 Total No. of splitters in IDFs 64 pcs = 29 pcs of 1: pcs of 1:16 branches Total No. of branches from all splitters 792 ports = 29 x x 16 Max. service penetration achievable 57.3% = 792 branches / 1,382 houses (for a specific BSP)
29 FDF Termination of fiber and copper ONT accommodation and power outlet TV broadcasting etc. Outlet 1 optical outlet in living room 4 copper outlets in each room FDF with Access point
30 Patch cord Patch cord PIU-01 PIU-11 PIU-10 PIU-20 1 st splitter is1:2 or 1:4 IN(1..26) OUT(1..68) 4core ABF(1..32) (1..128) MDF OLT#1 OLT#2 Splitter Shelf #1 #2 #3 #32 Now the subscriber in the 1 st house can connect broadband service based on PON Connecting 1 st axis To 1st house ONT To 2nd house ONT To last house ONT 4core Hybrid cable termination (pigtail not shown) Axis IDF 4core ABF TPS SM 4core conventional IN(1) OUT(1..8) MM 2 nd splitter is 1:8 or 1:16 Go to upper zone Patch cord ABF Termination Shelf 7way 5/3.5 DI cable BSP s IDF in 1 st axis of building
31 Premium grade Emblem certified MDU OLT GE-PON system with max. 1:64 split 2 stage split with 1 st in MDF, 2 nd in IDF Total 90 splitters used Fiber cable Total 8,400m microduct laying and ABF blowing 4 core ABF into 5/3.5 tube Max. service penetration ratio of a BSP 57.3%
32 Dasan V5724G GE-PON budget requirement Within 27dB Attenuation and insertion loss SM fiber: 0.25dB/km Splitter: 3 + α db/1:2 split Fusion splice: 0.05~0.1dB/splice SC/PC connector: 0.1~0.5dB/mate
33 Longest path and worst case Relay connection to upper IDF with 64 branches Condition Longest ABF blowing is about 450m 36m conventional cable relay 1 st 1:4, 2 nd 1:16 splitter branched(total 64 branched) No. of patch or fusion splice is same
34 Single mode fiber 0.12 db = 0.25 db x ( ) Splitter 18 db + α = 3 db x 6 times(64 = 2 6 ) + α Additional loss of splitter should be considered(+15%) Fusion splice 0.3 db = 0.1 db x 3 locations Connector 3 patch cords used for link 3.5 db = 0.5 db x 7 mates
35 Total loss of the path db = (18 x 1.15) Power margin 2.38 db available Considered worst cases GE-PON FTTH service available!
36 Considerations Min. 2~3dB margin should be secured Fiber loss is not a major factor Splitter loss can not be controlled For long distance, fusion splice quality is important Clean connector and exact mating is the most important
37 OLT and ONT 2 chassis of GE-PON OLT 792 ONTs Termination shelf 1 shelf for splitters 1 shelf for ABF termination IDF in building 64 IDFs
38 Splitter 90 pcs of 1:2, 1:4, 1:8 and 1:16(1 st 26pcs, 2 nd 64 pcs) Fiber and cable 7 way 5/3.5 DI: 8,400m + 10% excess length 4 core ABF: 8,400m + 3% excess length 1 way 5/3.5 DI: 32 x 5m for tube extension to rack Tube connector 5mm straight connector: 32 pcs for tube extension to rack DB microduct and ABC
39 SC/PC Jumper cord 218 pcs = 26 PIU port to splitter input + 64 splitter output to ABF + 64 cut to pigtail for ABF termination in MDF+ 64 cut to pigtail for termination in buildings SC/PC adaptor 1,078 pcs = ( ) splitter input and output port in MDF ABF termination in MDF + ( ) splitter input and output port in buildings Sleeve for splice protection 320 pcs = 128 ABF termination in MDF + 32 No. of axis x (2 ABF termination in lower IDF + 2 fusion for relay + 2 termination in upper IDF ) All contents inside axis IDF are not included Sleeve
40 MDF room as CO/POP More racks and bigger FDFs Microduct cable DI will be changed to DB, TWD, Aerial etc. 5/3.5 will be changed to 12/10, 14/10, 16/12 etc. For longer distance, cable connection will be needed Feeder, distribution and drop cabling will be appeared Various installation methods like pulling, direct burial, microtrench, HDD will be used LSZH will be used for in-building network HDD: Horizontal Directional Drilling
41 Optical fiber cable 4 core ABF will be changed to higher count ABC Fiber splice will be needed at closure in manhole/handhole or street cabinet Sometimes, cascade or bidirectional blowing can be used IDF in building IDF will be changed to wall mount in subscriber s building or street cabinet Splitter can be accommodated inside street cabinet or closure in manhole/handhole/pole
42 Certified FTTH MDU based on PON technology Simple, reliable and cost-effective infrastructure Flexible design with microduct and ABF Extra fibers and tubes reserved for future expansion Future-proof technology for broadband services OSP design can be made based on the same concept Micorduct, fiber cable, closure, street cabinet will be used Various installation methods will be adopted
43 FTTH Handbook 5 th edition, FTTH Council Europe, 2012 Dasan Networks Inc. V5724G product leaflet, 2012 Homepage of the Jayeon & Hill State apartment, 2012 Criteria for the certification of Emblem buildings, BICA, 2012 Homepage of the Shinhan Networks, 2012
44
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