Black Box LGB5052A, LGB5028A Cable Testing for Existing Category 5 Cable, Fiber Standards

Appendix C: Cables

Table C-2. 1000BASE-T MDI and MDI-X port pinouts.

Pin	MDI Signal Name	MDI-X Signal Name
1	Bidirectional Pair A plus (BI_DA+)	Bidirectional Pair B plus (BI_DB+)
2	Bidirectional Pair A minus (BI_DA-)	Bidirectional Pair B minus (BI_DB-)
3	Bidirectional Pair B plus (BI_DB+)	Bidirectional Pair A plus (BI_DA+)
4	Bidirectional Pair C plus (BI_DC+)	Bidirectional Pair D plus (BI_DD+)
5	Bidirectional Pair C minus (BI_DC-)	Bidirectional Pair D minus (BI_DD-)
6	Bidirectional Pair B minus (BI_DB-)	Bidirectional Pair A minus (BI_DA-)
7	Bidirectional Pair D plus (BI_DD+)	Bidirectional Pair C plus (BI_DC+)
8	Bidirectional Pair D minus (BI_DD-)	Bidirectional Pair C minus (BI_DC-)

C.6 Cable Testing for Existing Category 5 Cable

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: When testing your cable installation, be sure to include all patch cables between switches and end devices.

C.7 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 to 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.

C.8 Fiber Standards

The International Telecommunication Union (ITU-T) has standardized various fiber types for data networks. These are summarized in Table C-3.

		Table C-3. 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	Longer spans and extended reach. Optimized for operation in the 1310-nm band, but can also
	9-/125-micron core	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 form 1285 to 1625 nm. The zero dispersion wavelength is in the 1310-nm region.

G.653	Dispersion-shifted fiber, single-mode,	Longer spans and extended reach. Optimized for operation in the 1500- to 1600-nm band.
	9-/-125-micron core
G.654	1550-nm loss-minimized fiber, single-mode,	Extended long-haul applications. Optimized for high-power transmission in the 1500- to
	9-/125-micron core	1600-nm region, with low loss in the 1550-nm band.
G.655	Non-zero dispersion-shifted fiber, single-mode,	Extended long-haul applications. Optimized for high-power dense-wavelength-divison
	9-/125-micron core	multiplexing (DWDM) operation in the region from 1500 to 1600 nm.

LGB5028A User‘s Manual 724-746-5500 blackbox.com Page 231