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| Mitsubishi Electric WDM Transmission System has been produced to meet the need for increased backbone capacity required for migration to IP Networking and Broadband Access. This equipment simplifies the network configuration, while at the same time improving maintainability and slashing network costs. |
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| Wavelength Division Multiplexing (WDM) is the transmitting
of a number of different optical wavelengths together through
a single fiber. |
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| Originally, when accessing multiple switches or routers, the number of fibers
had to be increased whenever the amount of Synchronous Digital Hierarchy
(SDH) equipment was increased, since each unit required its own fiber. However,
with a WDM connection, the transmission capacity can be expanded without
adding new fibers. |
| Two WDM transmission system configurations
are in common use: |
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1. Point-to-Point
2. Ring |
| The former is referred to as a WDM System,
the latter as an Optical Add Drop
Multiplexer (OADM). |
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A maximum of 40 two-way waves
can be multiplexed. |
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A single wavelength can carry up to 10Gb/s. |
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Ethernet: GbE, 10GbE |
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SDH/SONET:150Mb/s (STM4 /OC3),600Mb/s
(STM4/OC12),2.5Gb/s |
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(STM16/OC48),10Gb/s (STM64/OC192) Multi-rate
Interface (100Mbps ~ 2.5Gbps) |
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Max. 2400km range. |
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SDH/SONET:150Mb/s (STM4 /OC3),600Mb/s
(STM4/OC12),2.5Gb/s |
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Up to 720km range with optical amplification
alone. |
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The Optical Amplifier incorporates
a variable attenuator to compensate automatically for transmission
line loss changes due to fiber aging and seasonal variations. |
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The ALC in the Optical Amplifiers
avoids the need for existing-equipment level adjustments
even when adding
wavelengths and systems. |
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A graphical display supports
systematic fault elimination. Furthermore, the monitored
data is delivered up the equipment chain via SNMP.
*SNMP: Simple Network Management Protocol, defined by the IETF for managing IP
networks. |
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