Provisioning CERNET with Dark Fiber

1
Provisioning CERNET with Dark Fiber

• Xing Li , Congxiao Bao
• CERNET Center
• lt2003-04-08gt

2
Outline

• Background
• CERNET Optical Network
• Operation Experience
• Perspective

3
CERNET

• China Education and Research Network is one of
  the 10 national IP backbones in Mainland China
• CERNET is the 2nd largest IP backbone
• The equipment founding came from MoE and State
  Planning Commission
• The Operation is self funded

4
CERNET Link History

• 1995
• 64K leased lines link to 8 regional network
  centers
• 1996
• 512K leased lines link to 8 regional network
  centers
• 9.6K X.25 or 64K leased line to 28 provincial
  centers
• 1997
• 3.7M point-to-point satellite link to 8 regional
  network centers
• 64K point-to-point satellite link to 12 remote
  provincial centers
• 1999
• 155M SDH link to 8 regional network centers

5
CERNET Layer 3 Topology

6
CERNET Statistics

• 36 PoPs covers all the provincial capitals
• More than 1,000 universities located in 200
  cities
• Currently about 10M users
• There are 320M Students in China

7
CERNET Dark Fiber Topology
8
Current Architecture
Router Cisco
Router Cisco
155M
SDH 16x155M Lucent
2.5G
2.5G
DWDM 16x2.5G Lucent
Dark Fiber
9
CERNET Transport Network

• Transport network
• 20,000 km
• 200 relay stations
• DWDM 16x2.5G
• SDH 155M

10
Three Types DWDM sites

• OA Optical Amplifier
• Terminal
• Dual-Face

11
CERNET DWDM System

• 16x2.5G DWDM system (two lambdas are currently
  running)
• OC48 POS links to 8 cities
• OC3 POS SDH links to all provincial capitals
  (except Lhasa)
• unicast and multicast

12
DWDM System
Receive 3R
Transmit
1550
0
1551
1552
1553
20 ppm
1554
50 ppm
1555
PLL
1556
1557
Transmit
Receive 3R
50 ppm
1550
LOOP TIMING
PLL
1551
1552
1553
1554
1555
1556
1557
13
Hut Spacing
14
Power Budget
15
Configuration of Terminal Site
16
Configuration of Dual-Face Site
17
Typical Site Configuration Example
18
Stations
19
Some Reality

• Because POS interface is wavelength insensitive,
  OTU need not to be used after ODU.
• Because DWDM system is point-to-point connection
  and has no self-healing capability, layer 3
  routing restoration must be depended in case of
  fiber break.
• Optical character test of optical interface must
  be done periodically because of aging both in
  equipment and fiber.

20
CERNET Backbone Bandwidth
21
Backbone Traffic
22
CERNET DWDM for IPv6-CJ Testbed
23
Next Step

• ELH for 3,500 km DWDM system
• Remove SDH Layer
• Use OADM
• Unified Management System
• Optical
• IP
• OXC
• Traffic Engineering
• CWDM for the MAN
• City PoPs

24
CapEx and OpEx is Reduced by ELH-DWDM
Terminal Site
Replacing O-E-O by OA
25
Unified Control Plane (UCP)
Common Set of Control Functions
Addressing, Routing, and Signaling Protocols
Control Network
MetroDWDM
CoreDWDM
MetroSONET
IP
IP
Generalized across Disparate Transport
Technologies
UCP Beneficiaries and Functions End User On
Demand, Optical Channel Provisioning Transport
Provider Low Cost Per Bit Data Aware
Optimization Application Provider New,
Differentiated ServicesAt a Profit
26
Fiber ring OIX with OBGP
27
Spectrum of CWDM

• 850nm778nm?801nm?825nm?850nm
• OBand1275.5nm?1300.2nm?1324.7nm?1349.2nm
• (1290?1310?1330?1350)
• EBand1380 nm?1400nm ?1420nm ?1440nm
• SCL Band1470nm?1490nm? 1510nm
  ?1530nm?1550nm?1570nm?1590nm?1610nm

28
CNGI

• Testbed
• Test and Measurement
• Network Services
• Demo Applications
• Commercial Services
• Network Equipment