Black Box LGB6026A manual Fiber Standards, Adjusting Existing Category 5 Cabling to RUN 1000BASE-T

CHAPTER B Cables

Fiber Standards

ADJUSTING EXISTING CATEGORY 5 CABLING TO RUN 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.

FIBER STANDARDS

The International Telecommunication Union (ITU-T) has standardized various fiber types for data networks. These are summarized in the following table.

Table 19: Fiber Standards

ITU-T	Description	Application
Standard
G.651	Multimode Fiber	Short-reach connections in the 1300-
	50/125-micron core	nm or 850-nm band
G.652	Non-Dispersion-Shifted Fiber	Longer spans and extended reach.
	Single-mode, 9/125-micron core	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-	Longer spans and extended reach.
	Dispersion-Shifted Fiber	Optimized for wavelength-division
	Single-mode, 9/125-micron core	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	Longer spans and extended reach.
	Single-mode, 9/125-micron core	Optimized for operation in the region
		from 1500 to 1600-nm.

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