Contents
Trend 1: Metro Optical Ethernet
Internet Access service
TLS (Transparent LAN Service)
2000년초태동->2001년(국내검토시작) -> 2002년(서비스도입) ->2003년(기업용서비스, vdsl)
Cannibalization
게임방, 사이버아파트
차별화상품(드림라인, HiG,…), 경쟁관계(KT<->하나로)
Internet Access, VLAN => Ethernet over MPLS => VPLS
Trend 2: IP와방송의융합
북미의History: 위성방송<->MSO<->Telco: 무한경쟁화
국내의경우: 거의유사한경로를따라가고있음
Cable operator: CATV + Internet (+VoIP) -> 서비스번들화
Telco: IP 기반방송(다채널B-TV, VoD) 서비스진입중, 문제점(KT, 하나로)
2001년(검토시작)->2002년, 2003년(시험서비스, 필드테스트중)->2004 ?
Summary
Metro Ethernet
Enterprise MAN: Before Metro Ethernet
Metro
Access
동
Enterprise MAN service: Low-Speed
Metro
Access
Enterprise MAN service: High-Cost
Metro
Access
New ESP (Ethernet Service Provider)출현
Metro
MTU
Access
Telseon
Yipes
Cogent
Ethernet Evolution
Access
Metro Distribution
Metro Core
ATM ADSL
T1/E1
FR
ATM
MDU
STU
Residential
Enterprise
Yipesand Telseon
WorldCom EoRPRNetwork
Aggregation POP
with Internet POP
Gigabit Trunk to
Gateway Router
From OC-48 OPE
OPE
Metro Optical Ethernet Network의구축방안은Ethernet over Dark Fiber, Ethernet over SONET, Ethernet over RPR, Ethernet over DWDM, Ethernet over MPLS 등으로다양한방법이존재한다.
Worldcom은Ethernet over RPR over SONET 방식으로메트로액세스와코어네트워크를구축했다. 이망구조에서는RPR 계층또는SONET 계층에서망복구기능을수행하므로50msec이내의복구시간을보장해줄수있어매우안정적인운영이가능하다. 또한SONET 망을RPR의하부망으로이용하므로Ethernet (Data) 서비스이외에음성전화(POTS)와TDM 기반의전용회선서비스도단일망을통해동시에제공이가능하는장점을갖는다.
WorldCom(1): Internet Access Service
VLANspass through OPE Gig Trunk
to Gateway Router
VLAN 10 = CustA
VLAN 20 = CustB
VLAN 30 = CustC
파워드콤(일본이더넷MAN/WAN 전용회선서비스)
서비스현황
이더넷전용회선서비스에주력하고있으며특이한점은국내와는달리이더넷WAN 서비스를제공한다는점이다.
망구축현황
메트로네트워크: Switched Ethernet (Ethernet over dark fiber 모델)로구축되었으며가입자간의구분/분리는802.1Q VLAN을할당하여제공해준다.
전국망: 각메트로POP에있는Core Ethernet Switch는각메트로의트래픽을Aggregation하고WAN 구간으로전달한다. WAN은Ethernet over SONET over DWDM의구조를가진다.
Level3
.Level3 미국의SP(IXC)로Nationwide Backbone을MPLS로구축(Cisco, Juniper)
.Metro 구간을Metro Optical Ethernet으로구축(Laurel)
.Ethernet over MPLS (MPLS L2 VPN) 서비스제공: Martini-draft를구현함.
.Customer separation: Metro(VLAN), Backbone(MPLSLSP)
.QoS제공방안: CPE에서802.1p marking, Metro에서는802.1p 비트를보고QoS차별화, Edge에서802.1p-to-MPLS EXP 매핑(현재로서는ExlicitLSP를사용하며, QoS별로별도의LSP를설정하는것은아님.)
AT&T Network Architecture
With MTU
Ethernet
Masergy
KT (Enterprise Service)
.Riverstone사의L3 switch를이용하여Metro Optical Ethernet Network 구축
.국내에서유일한Whole sale 모델이며Dacom, Onse, HiG등의ISP 가파워콤의메트로인트라를이용하여고객에게인터넷액세스서비스를제공해주고있음.
.이를위해Source IP에근거한Forwarding 기능이POP의Router (ISP 접속라우터)에요구되며Riverstone사의RS38000이기능을수행한다.
.Metro Core구간에링이발생하나L2가아닌L3 (Dynamic Routing, OSPF)로운영하여STP나RSTP는동작시키지않는다. NetworRestoration은Dynamic routing protocol에의존하고있으며따라사복구에수초가소요된다.
.CPE는서비스초기에는L2 CPE를사용하였으나가입자측의Broadcast frame이사업자측CO의장비까지올라와CPU 점유율이높아져망이불안정해지는상황이발생하여현재는L3 CPE로교체하여사용하고있다.
.현재는인터넷액세스서비스를주고제공하고있으며향후MPLS를도입하여이더넷전용회선서비스를제공하기위해검토하고있다.
Powercomm(Enterprise Service)
Residential Service
Before Metro Ethernet: Legacy Networks
Residential
Home
동
After Metro Ethernet: Residential access
2002
Yahoo!BB(Residential Service)
통신과방송의경계파괴
통신사업환경의변화: 비즈니스경계의파괴
MSO’s“Triple-Play”Service
Triple Play in MSO
Video: Broadcast TV, VoD, PPV, HDTV
High-Speed Internet: Cable Modem (DOCSIS1.1/2.0)
Voice: Cable Telephony, VoIP
a one-stop shop for voice, video and data.
Goldman Sachs forecasts that by 2007, 20 percent of a MSO\'srevenue will come from telephony.
Example Full-Service Bundle
40% of households “somewhat/very interested”in FS bundles
MSOsexpect ~$100/m from bundled customer
Source: VideoTele.com, Yankee Group, CahnersIn-Stat, ChibardunTelephone Cooperative
may ultimately trigger permanentdisconnect of Telco
Telco Video Drivers
MSO의“Bundled Triple Play”service로인해Telco의주수익원인Voice 시장잠식
May ultimately trigger permanent disconnect of Telco
가입자이탈방지
기존의Access망과최소한의투자를통해단일망으로“Triple Play”service를제공함으로써ARPU (Average Rate Per User)의증대
Competition with MSO
Telco’s Network Evolution
Telco’s Metro Networks 1
초기의초고속인터넷액세스서비스
MDU
Residential
Telco’s Metro Networks 2
Metro Ethernet의도입
Telco’s Metro Networks 3
Broadcast TV
Headend
VoD
Headend
Video over IP
영상콘텐츠를
IP 망을통해전달
How does video over IP works ?
VoDservice scenario 1
VoDservice scenario 2
Broadcast TV service Scenario 1
Network Initialization
Broadcast TV service Scenario 2
STB booting
Broadcast TV service Scenario 3
Select a channel
Video over IP Requirement
Requirement: QoS(data-path)
Broadcast TV
Headend
VoD
Headend
Requirement: QoS(Control plane)
Requirements: IP Multicast
Broadcast TV
Headend
VoD
Headend
PIM-SM, IGMP
Yahoo!BB(Residential Service)
Yahoo!BB(Residential Service)
Yahoo!BB
Last-mile
(adsl)
Metro Core
(Metro Ethernet, 1G/10G)
IP 방송서비스
?Øu
Video over IP Trends
Video Component Cost
Continue to decline
(Encoder, IP STB, VoDserver)
Technology Improvement
Access BW: ADSL2+, VDSL, Ethernet
Video compression: MPEG2/4, WMT9, H.264
Time
Performance
Price
Video over IP Demo Lab Photos
Headend-POP Network Configuration
VCR player
DVD player
Netmanias IP Video Service Demo Lab.
Residential
IP TV : Multicast Scenario
RP
Router
TV Channels
1. All broadcast TV Channels distributed to RP
Select CH 2
2. IGMPv2 leave for previous or default channel
IGMPv2 leave
3. IGMPv2 query
4. IGMPv2 join
Select CH 2
Channel Zapping .Case 1
L3 Switch 까지모든multicast traffic 이가는경우
Channel Zapping Time
Network Delay, MPEG Decoding Delay (STB)
STB
Router
LHR
L2
IGMP leave (group : 234.1.1.2)
4 Mbps MPEG-2 (CH2 : 234.1.1.2)
Select CH 1
IGMP query for 234.1.1.2
4 Mbps MPEG-2 (CH1 : 234.1.1.1)
t4
tz
100Tx
GE
GE
Channel Zapping .Case 2/3
Metro Router or Edge Router 까지모든multicast traffic 이가는경우
STB
Router
LHR
L2
4 Mbps MPEG-2 (CH1 : 234.1.1.1)
4 Mbps MPEG-2 (CH2 : 234.1.1.2)
4 Mbps MPEG-2 (CH1 : 234.1.1.1)
4 Mbps MPEG-2 (CH2 : 234.1.1.2)
Case 2
Case 3
100Tx
GE
GE
Copy the packets
Copy the packets
Multicast Scalability
Multicast group capacity, IGMP multi-session
STB
Router
LHR
L2
Smartbit
100Mbps 6 Ports (40 groups per 100Tx)
Select CH 2
100Tx
GE
GE
QoSRequirement of Streaming Video
HDTV Server
VOD Server
QoSRequirement of Streaming Video
Streaming Video requires lower packet loss and jitter
STB
L2
100Tx
0.1
1000
Delay / Jitter[msec]
low
0
high
0.2
0.3
0.01
0.1
1
10
Packet discard ratio [%]
low
0
high
0.03
0.05
QoSImplementation