.SAN design reference guide Vol. 1-5 785350-001

• 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
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
• Two 4-channel OADMs
• One 8-channel multiplexer/demultiplexer
• CWDM SFP transceivers (1470, 1490, 1510, 1530, 1550, 1570, 1590, 1610 nm)
The 1 Gb/s or 2 Gb/s CWDM solution includes the following components:
• A 2-slot chassis for OADM CWDM multiplexer modules, which have the following components:
Eight 1-channel OADMs◦
◦ Two 4-channel OADMs
◦ One 8-channel multiplexer/demultiplexer
• CWDM SFP transceivers (1470, 1490, 1510, 1530, 1550, 1570, 1590, 1610 nm)
A typical CWDM SFP transceiver installation includes:
• Two multiplexers/demultiplexers or two OADMs
• Up to eight matched pairs of CWDM SFP transceivers of the same frequency
• Up to eight single-mode fiber optic cables
• One long-distance, single-mode fiber optic cable
For more information, see the C-series Coarse Wave Division Multiplexer product documentation
at http://h18006.www1.hp.com/products/storageworks/cwdm/index.html.
NOTE: The HP CWDM multiplexer solution is not supported on B-series or H-series switches.
For more information about B-series and C-series supported WDM devices, see “Certified third-party
WDM, iFCP, and SONET products” (page 317).
Third-party WDM products
HP supports third-party WDM products that have been tested successfully with a wide range of HP
products. See “Certified third-party WDM, iFCP, and SONET products” (page 317).
Figure 88 (page 264) and Figure 89 (page 264) show basic WDM SAN configuration options for
typical HP Continuous Access storage systems. For specific configuration options, see the HP P6000
Continuous Access and HP P9000 (XP) Continuous Access product documentation.
Fibre Channel long-distance technology 263