Wdm System Characteristics; Hp Coarse Wave Division Multiplexing - HP StorageWorks 4000/6000/8000 - Enterprise Virtual Arrays Reference Manual

System architecture
Active signal amplification
Active protocol handling
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Active protocol handling and passive protocol handling require different switch port settings. See

WDM system characteristics

To help carriers realize the full potential of WDM, HP-supported WDM systems have the following
characteristics:
Use the full capacity of the existing dark fiber
Offer component reliability, 24x7 availability, and expandability
Provide optical signal amplification and attenuation to increase the transmitted/received signal-
to-noise ratio
Provide signal conditioning (that is, the retiming and reshaping of the optical data-carrying signal)
for optimization of the bit error rate
Offer channel add/drop capability (the ability to change the number of data channels by adding
or dropping optical wavelengths on any network node)
Allow compensation of power levels to facilitate adding or dropping channels
Provide upgradable channel capacity and/or bit rate
Allow interoperability through standards-compliant interfaces such as Fibre Channel, SONET, and
ATM
Convert wavelengths at each interface channel before multiplexing with other channels for
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transmission

HP coarse wave division multiplexing

HP offers CWDM, which is similar to DWDM but is less expensive, less expandable (maximum of
eight channels), and covers a shorter distance (up to a maximum of 100 km using the 1 Gb/s or 2
Gb/s CWDM SFP transceivers, and a maximum of 40 km using the 4 Gb/s CWDM SFP transceivers).
CWDM allows up to eight 1 Gb/s, 2 Gb/s, or 4 Gb/s channels (or wavelengths) to share a single
fiber pair. Each channel uses a different color or wavelength CWDM SFP transceiver. The channels
are networked using a variety of wavelength-specific multiplexers/demultiplexers or OADMs that
support ring or point-to-point topologies.
The 4 Gb/s CWDM solution includes the following components:
A 2-slot chassis for CWDM multiplexer modules
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Includes line amplifiers and attenuators that connect to other devices through fiber
optic links
Boosts the signals that are transmitted to and received from peripheral network devices
Using hardware and/or software control loops, monitors power levels to ensure that
the operation does not exceed the hardware's power budgets
Offers protocol-specific capabilities for Fibre Channel, enabling digital TDM and
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optical multiplexing to support multiple channels on each wavelength
Provides network monitoring, digital retiming (to reduce timing jitter), link integrity
monitoring, and distance buffering
May require additional and potentially costly transmission hardware when deployed
in meshed networks
Note: HP Continuous Access products require in-order delivery of data replication Fibre
Channel frames. Architectures, products, or protocols that do not guarantee in-order delivery
are not supported.
Description
Table 141 on page 288.
SAN Design Reference Guide 285