Data Transmission Distance; Cost-Effectiveness; Device Or Cable Restrictions - HP 316095-B21 - StorageWorks Edge Switch 2/24 Planning Manual

Physical Planning Considerations
Consider the following when determining the number and type of each transceiver
to use:

Data Transmission Distance

Data transmission distance is the primary factor governing the choice of
transceiver type and optical fiber. If the transmission distance is:
Variables such as the number of patch panel connections, link speed, grade of
fiber-optic cable, device restrictions, application restrictions, buffer-to-buffer
credit limits, and performance requirements can affect transmission distance.

Cost-Effectiveness

Cost is another factor governing the choice of transceiver type and optical fiber.
Shortwave laser transceivers and multimode cable offer a less expensive solution
if data transmission distance is not critical.

Device or Cable Restrictions

The choice of transceiver and cable type may be restricted or dictated by:
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Distance between a director or switch and the attached Fibre Channel device
or between fabric elements communicating through an ISL.
Cost effectiveness.
Device restrictions or requirements with respect to existing fiber-optic cable
(multimode or single-mode).
Less than 150 meters, multimode or single-mode optical fiber and any type of
optical transceiver can be used.
Between 150 and 300 meters, 50/125-micron multimode or single-mode
optical fiber and any type of transceiver can be used.
Over 300 meters, only single-mode optical fiber and a longwave laser
transceiver can be used. A 62.5 micron cable is only supported for the use of
existing cable plants. HP recommends the use of 50 micron cables for new
installations.
Device restrictions — Some devices may be restricted to use of only one
type of transceiver (shortwave or longwave). Refer to the supporting
documentation delivered with the product for information.
Existing cable restrictions — The enterprise may contain only one type of
fiber-optic cable (multimode or single-mode) and the customer may be
required to use the existing cables.
SAN High Availability Planning Guide