HP StorageWorks 4000 Understanding Compaq StorageWorks RAID Array 4000 and Inf - Page 14

Testing

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Understanding Compaq StorageWorks RAID Array 4000 and Infrastructure Cabling 14 Testing Testing ensures proper operation and reduces the error rate. The power generated by the transmitter and the sensitivity of the receiver determine the amount of power available. This amount must be greater than the sum of any power penalties and the attenuation between the optical transmitter and receiver. Attenuation will always occur in the fiber, connectors, and splices. A variety of factors can cause excessive attenuation, and testing detects excessive attenuation between components. For example, a splice will always cause some amount of attenuation, but a poorly joined splice may cause attenuation that exceeds expectations. Bad connections can be detected and repaired during testing. Individuals experienced in testing and installing fiber optic infrastructure cabling should test cabling for the link insertion loss after installation. Testing existing infrastructure cabling can be difficult because portable bandwidth test equipment may not be available. For more information, see Acknowledgments and References later in this document. Test Specifications Multi-mode cables should be tested such that the total link insertion loss from the transmitter to the receiver is no greater than 6 dB minus any associated power penalties. EIA/TIA-526-14, Method B can be used for insertion loss testing. The modal bandwidth requirement for 62.5-micron multi-mode cables is 160 MHz·km at 850 nm. The fiber must comply with the appropriate Fiber Optic Test Procedure (FOTP-30, FOTP-51, FOTP-54) for testing multi-mode cable bandwidth as supplied by the fiber manufacturer. The length (62.5/125 optical cable) is limited by the bandwidth of the cable. A larger core size cable results in higher modal dispersion, producing a lower bandwidth, and limits the length to shorter distances between components. The modal bandwidth requirement for 50-micron multi-mode cables is 500 MHz·km at 850 nm as tested by the fiber manufacturer. This higher modal bandwidth results in longer achievable distances between components, compared to 62.5 micron multi-mode cables, for a given data rate. ECG02030699A

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Understanding Compaq StorageWorks RAID Array 4000 and Infrastructure Cabling
14
ECG02030699A
Testing
Testing ensures proper operation and reduces the error rate.
The power generated by the transmitter and the sensitivity of the receiver determine the amount
of power available. This amount must be greater than the sum of any power penalties and the
attenuation between the optical transmitter and receiver.
Attenuation will always occur in the fiber, connectors, and splices. A variety of factors can cause
excessive attenuation, and testing detects excessive attenuation between components.
For example, a splice will always cause some amount of attenuation, but a poorly joined splice
may cause attenuation that exceeds expectations. Bad connections can be detected and repaired
during testing.
Individuals experienced in testing and installing fiber optic infrastructure cabling should test
cabling for the link insertion loss after installation. Testing existing infrastructure cabling can be
difficult because portable bandwidth test equipment may not be available. For more information,
see
Acknowledgments and References
later in this document.
Test Specifications
Multi-mode cables should be tested such that the total link insertion loss from the transmitter to
the receiver is no greater than 6 dB minus any associated power penalties. EIA/TIA-526-14,
Method B can be used for insertion loss testing.
The modal bandwidth requirement for 62.5-micron multi-mode cables is 160 MHz
·
km at 850 nm.
The fiber must comply with the appropriate Fiber Optic Test Procedure (FOTP-30, FOTP-51,
FOTP-54) for testing multi-mode cable bandwidth as supplied by the fiber manufacturer. The
length (62.5/125 optical cable) is limited by the bandwidth of the cable. A larger core size cable
results in higher modal dispersion, producing a lower bandwidth, and limits the length to shorter
distances between components.
The modal bandwidth requirement for 50-micron multi-mode cables is 500 MHz
·
km at 850 nm as
tested by the fiber manufacturer. This higher modal bandwidth results in longer achievable
distances between components, compared to 62.5 micron multi-mode cables, for a given
data rate.