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Joseph Ho
May 17, 2004
National Security BureauAdvantages of DWDM over SDH
Proprietary & ConfidentialProprietary & Confidential
Content
• Metro Network Trends
• Driver for DWDM
• Simplicity – One Network
• Case Study : National Security Bureau Network
Proprietary & ConfidentialProprietary & Confidential
Other...
FDDIFDDI
ESCONESCON
FibreFibreChannel (1/2G)Channel (1/2G)
VideoVideo
HDTVHDTV
ESCONESCONFibre- Fibre- ChannelChannel
MainframeMainframe
STM-1STM-1D1D1HDTVHDTV
HQ VideoHQ Video
IP
STM-4STM-4
STM-16STM-16Gigabit Gigabit EthernetEthernet
Fast Fast EthernetEthernet
DS3DS3
STM-1STM-1STM-1STM-1STM-4STM-4STM-16STM-16G EthG EthF EthF Eth
Routers/IPswitchRouters/IPswitch
Metro Networks TrendsH
igh
er S
ervi
ce R
ates
Hig
her
Ser
vice
Rat
es
Growing Range of ServicesGrowing Range of Services
2.5 G2.5 G
1 G1 G
622 M622 M
155 M155 M
100 M100 M
45 M45 M
1.5 M1.5 M
ServiceService
ATM
STM-1STM-1
STM-4STM-4
DS3DS3
ATM SwitchesATM Switches
STM-1STM-1STM-4STM-4STM-16STM-16
TechnologyTechnology
Application Space GrowingApplication Space GrowingOptical Interfaces Across Diverse Group of Equipment.Optical Interfaces Across Diverse Group of Equipment.
NO LONGER JUST SDH!NO LONGER JUST SDH!
Cross ConnectsCross Connects
STM-1STM-1STM-4STM-4STM-16STM-16
STM-1STM-1STM-4STM-4STM-16STM-16STM-64STM-64
SDHSDH
TDM
DS3DS3
DS1DS1
Proprietary & ConfidentialProprietary & Confidential
Extends the Capacity of Existing Fiber (32 Times)
Universal Optical InterfacesUniversal Optical Interfaces
Accommodates Any Input Rate Between 16 Mbps and 10 Gbps
Permits Carriage of Any Protocol Known Today or in the Future
Scaleable DesignScaleable Design
Cost Scales Linearly With Capacity
Forecast-TolerantForecast-TolerantArchitectureArchitecture
Quickly Adapts to Unforeseen Demand and Changing Interfaces
D1ESCON
FDDIGbe
Drivers for DWDM
Proprietary & ConfidentialProprietary & Confidential
Simplicity : One Network for NSB
SDHSDH
IP IP
Mainframe Networking
Mainframe Networking
VideoVideo
Traditional ApproachTraditional Approach
•Special Assemblies•Network Overlays
DWDM DWDM Optical NetworkOptical Network
D1 Video
Gigabit Ethernet
ESCON
SDHSTM-1/4/16
Fibre Channel
FICON
Async
Wavelength Networking Wavelength Networking
•Ubiquitous Networking•Forecast Tolerant
One Network = Simplicity & Reduced Operations Costs
Proprietary & ConfidentialProprietary & Confidential
Case Study – National Security Bureau
• DWDM vs. SDH Comparison – traffic scale up
• 4 Node Ring
• Examine the Shelf Layout and Equipment at Site A as traffic is increased from Day 1 to Day 2 to Day 3
• Note : Incremental hardware is shown in RED
Proprietary & ConfidentialProprietary & Confidential
National Security Bureau RingDWDM Expansion
Site A Site B
Site C
Site D
Take a look at the shelf at Site A when traffic is expanded
(assume traffic is from Site A to Site C only)
Proprietary & ConfidentialProprietary & Confidential
Day 1 : 2xGbE
OCM
A
OCM
B
(Band 1) 4 Channel OMX West (Band 1) 4 Channel OMX East
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20Slot2.
5G F
lex
OC
LD
B1C
12.
5G F
lex
OC
LD
B1C
1
Fill
er
Car
dF
iller
C
ard
2:1
GF
SR
M
Car
dF
iller
C
ard
Fill
er
Car
dF
iller
C
ard
Fill
er
Car
d
Fill
er
Car
d
Fill
er
Car
dF
iller
C
ard
Fill
er
Car
d
Fill
er
Car
dF
iller
C
ard
Fill
er C
ard
S PF
iller
C
ard
Total Traffic : 2 Gbs
Shelf at Site A
Proprietary & ConfidentialProprietary & Confidential
Day 2 : 4xGbE, 2xFC (1G)
OCM
A
OCM
B
(Band 1) 4 Channel OMX West (Band 1) 4 Channel OMX East
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20Slot2.
5G F
lex
OC
LD
B1C
12.
5G F
lex
OC
LD
B1C
1
2.5G
Fle
x O
CLD
B1C
2
2.5G
Fle
x O
CLD
B1C
2
2:1
GF
SR
M
Car
d2:
1 G
F S
RM
C
ard
2:1
GF
SR
M
Car
dF
iller
C
ard
2.5G
Fle
x O
CLD
B1C
3
Fill
er
Car
d
2.5G
Fle
x O
CLD
B1C
3
Fill
er C
ard
File
r C
ard
Fill
er
Car
dF
iller
C
ard
Fill
er C
ard
S PF
iller
C
ard
Total Traffic : 6 Gbs
Shelf at Site A
Proprietary & ConfidentialProprietary & Confidential
Day 3 : 4xGbE, 2xFC (1G), 4xSTM1, 2xFC (2G)
OCM
A
OCM
B
(Band 1) 4 Channel OMX West (Band 1) 4 Channel OMX East
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20Slot2.
5G F
lex
OC
LD
B1C
12.
5G F
lex
OC
LD
B1C
1
2.5G
Fle
x O
CLD
B1C
2
2.5G
Fle
x O
CLD
B1C
2
2:1
GF
SR
M
Car
d2:
1 G
F S
RM
C
ard
2:1
GF
SR
M
Car
d4:
1 S
RM
C
ard
2.5G
Fle
x O
CLD
B1C
3
2.5G
Fle
x O
TR
B
2C1
2.5G
Fle
x O
CLD
B1C
3
2.5G
Fle
x O
CLD
B1C
4
2.5G
Fle
x O
CLD
B
1C4
2.5G
Fle
x O
TR
B
2C1
2.5G
Fle
x O
TR
B
2C2
2.5G
Fle
x O
TR
B2C
2
S PF
iller
C
ard
(Band 1) 4 Channel OMX West (Band 1) 4 Channel OMX West
Total Traffic : 10.6 GbsShelf at Site A
Proprietary & ConfidentialProprietary & Confidential
National Security Bureau RingSDH Expansion
Site A Site B
Site C
Site D
Take a look at the shelf at Site A when traffic is expanded
(assume traffic is from Site A to Site C only)
Proprietary & ConfidentialProprietary & Confidential
Day One : 2xGbE
2.5G
Lin
e C
ard
2.5G
Lin
e C
ard
Dua
l G
bE C
ard
Com
mun
icat
ion
Car
d
Total Traffic : 2Gbs
Shelf at Site A
Proprietary & ConfidentialProprietary & Confidential
Day Two : 4xGbE, 2xFC (1G)
10G
Lin
e C
ard
10G
Lin
e C
ard
Dua
l GbE
Car
d
Com
mun
icat
ion
Car
d
Replace Line Card at ALL site
Dua
l FC
(1G
) C
ard
Dua
l GbE
Car
d
Total Traffic : 6GbsShelf at Site A
Proprietary & ConfidentialProprietary & Confidential
Day Two : 4xGbE, 2xFC (1G), 4xSTM1, 2xFC (2G)
Total Traffic : 10.6Gbs Shelf at Site A
Com
mun
icat
ion
Car
d
10G
Lin
e C
ard
10G
Lin
e C
ard
Qua
d po
rt S
TM
1 C
ard
2.5G
Lin
e C
ard
2.5G
Lin
e C
ard
DWDM Filter DWDM Filter
Com
mun
icat
ion
Car
d
Dua
l Por
t GbE
Dua
l Por
t GbE
Dua
l Por
t FC
(1G
)
FC
(2G
) C
ard
FC
(2G
) C
ard
In order to achieve this traffic, DWDM filters and an additionalShelf is required at ALL sites.
Proprietary & ConfidentialProprietary & Confidential
Conclusion
• When National Security Bureau increases to higher bandwidth (FC-1G, FC-2G, GbE) or has a mix of different types of traffic, the DWDM solution scales efficiently and at a significantly lesser cost than a SDH solution.
• SDH needs to reserve half the bandwidth for protection
• Forecast Tolerant : as NSB grows their network, the Metro DWDM solution will support all major and standard Optical signals.
• Scalability is simple – insert the blade into the shelf.