22-03-2012, 12:00 PM
Wavelength Division Multiplexing (WDM)
07_WavelengthDivisionMultiplexing.ppt (Size: 2.83 MB / Downloads: 44)
OverviewSub-Lambda Multiplexing
Multiplexing a single low rate data connection onto a wavelength is very inefficient.
For example, if a FastEthernet connection is transported on a WDM wavelength, only 4% of the bandwidth is used. This assumes the wavelength is capable of transporting 2.5 Gbps.
To better utilize bandwidth many vendors support sub-lambda multiplexing.
The cards that support this are often referred to as DataMux or Muxponder cards.
Muxponder cards have multiple ports (FE, GE, etc.). These cards multiplex the data flows and transports them onto a wavelength.
Some vendor use SONET framing to multiplex the data
Others use proprietary protocols
Benefits of WDM
WDM technology allows multiple connections over one fiber thus reducing fiber plant requirement.
This is mainly beneficial for long-haul applications.
Campus applications require a cost benefit analysis.
WDM technology can also provide fiber redundancy.
Specification for point-to-point WDM System
NASA has several sites that may benefit from a small end WDM solution. As such, the following specifications were given to vendors to obtain their solution(s).
A two node system in a point-to-point configuration with no link fail-over capability.
Each node should support 4 gigabit interfaces and 8 fast ethernet interfaces.
The nodes should have redundant power supplies and processors.
The nodes should be SNMP managed.
The distance between nodes will be approximately 3 miles.
WDM provides a managed fiber service.
07_WavelengthDivisionMultiplexing.ppt (Size: 2.83 MB / Downloads: 44)
OverviewSub-Lambda Multiplexing
Multiplexing a single low rate data connection onto a wavelength is very inefficient.
For example, if a FastEthernet connection is transported on a WDM wavelength, only 4% of the bandwidth is used. This assumes the wavelength is capable of transporting 2.5 Gbps.
To better utilize bandwidth many vendors support sub-lambda multiplexing.
The cards that support this are often referred to as DataMux or Muxponder cards.
Muxponder cards have multiple ports (FE, GE, etc.). These cards multiplex the data flows and transports them onto a wavelength.
Some vendor use SONET framing to multiplex the data
Others use proprietary protocols
Benefits of WDM
WDM technology allows multiple connections over one fiber thus reducing fiber plant requirement.
This is mainly beneficial for long-haul applications.
Campus applications require a cost benefit analysis.
WDM technology can also provide fiber redundancy.
Specification for point-to-point WDM System
NASA has several sites that may benefit from a small end WDM solution. As such, the following specifications were given to vendors to obtain their solution(s).
A two node system in a point-to-point configuration with no link fail-over capability.
Each node should support 4 gigabit interfaces and 8 fast ethernet interfaces.
The nodes should have redundant power supplies and processors.
The nodes should be SNMP managed.
The distance between nodes will be approximately 3 miles.
WDM provides a managed fiber service.