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PPENDIX
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| Cables
Fiber Standards
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A
DJUSTING
E
XISTING
C
ATEGORY
5 C
ABLING TO
R
UN
1000BASE-T
If your existing Category 5 installation does not meet one of the test parameters
for 1000BASE-T, there are basically three measures that can be applied to try
and correct the problem:
1.
Replace any Category 5 patch cables with high-performance Category 5e or
Category 6 cables.
2.
Reduce the number of connectors used in the link.
3.
Reconnect some of the connectors in the link.
F
IBER
S
TANDARDS
The International Telecommunication Union (ITU-T) has standardized various
fiber types for data networks. These are summarized in the following table.
Table 14: Fiber Standards
ITU-T
Standard
Description Application
G.651 Multimode Fiber
50/125-micron core
Short-reach connections in the 1300-
nm or 850-nm band
G.652 Non-Dispersion-Shifted Fiber
Single-mode, 9/125-micron core
Longer spans and extended reach.
Optimized for operation in the 1310-
nm band. but can also be used in the
1550-nm band
G.652.C Low Water Peak Non-
Dispersion-Shifted Fiber
Single-mode, 9/125-micron core
Longer spans and extended reach.
Optimized for wavelength-division
multiplexing (WDM) transmission
across wavelengths from 1285 to
1625 nm. The zero dispersion
wavelength is in the 1310-nm region.
G.653 Dispersion-Shifted Fiber
Single-mode, 9/125-micron core
Longer spans and extended reach.
Optimized for operation in the region
from 1500 to 1600-nm.