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PPENDIX
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| Cables and Pinouts
Fiber Standards
– 49 –
ES-2024G/2024GP
C
ABLE
T
ESTING
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E
XISTING
C
ATEGORY
5 C
ABLE
Installed Category 5 cabling must pass tests for Attenuation, Near-End
Crosstalk (NEXT), and Far-End Crosstalk (FEXT). This cable testing
information is specified in the ANSI/TIA/EIA-TSB-67 standard. Additionally,
cables must also pass test parameters for Return Loss and Equal-Level Far-
End Crosstalk (ELFEXT). These tests are specified in the ANSI/TIA/EIA-
TSB-95 Bulletin, “The Additional Transmission Performance Guidelines for
100 Ohm 4-Pair Category 5 Cabling.”
Note that when testing your cable installation, be sure to include all patch
cables between switches and end devices.
A
DJUSTING
E
XISTING
C
ATEGORY
5 C
ABLING
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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
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.
G.654
1550-nm Loss-Minimized Fiber
Single-mode, 9/125-micron core
Extended long-haul applications.
Optimized for high-power
transmission in the 1500 to 1600-nm
region, with low loss in the 1550-nm
band.
G.655
Non-Zero Dispersion-Shifted Fiber
Single-mode, 9/125-micron core
Extended long-haul applications.
Optimized for high-power dense
wavelength-division multiplexing
(DWDM) operation in the region from
1500 to 1600-nm.
Содержание iPECS ES-2024G
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