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Chapter 6
| Port Connections
Fiber Cabling Guidelines
Fiber Cabling Guidelines
Table 13: 1000BASE-T MDI and MDI-X Port Pinouts
Pin
MDI Signal Name
6
Bi-directional Pair B Minus (BI_DB-)
7
Bi-directional Pair D Plus (BI_DD+)
8
Bi-directional Pair D Minus (BI_DD-)
1000BASE-T Cable Requirements
All Category 5 UTP cables that are used for 100BASE-TX connections should also
work for 1000BASE-T, providing that all four wire pairs are connected. However, it is
recommended that for all critical connections, or any new cable installations,
Category 5e (enhanced Category 5) or Category 6 cable should be used. The
Category 5e and 6 specifications include test parameters that are only
recommendations for Category 5. Therefore, the first step in preparing existing
Category 5 cabling for running 1000BASE-T is a simple test of the cable installation
to be sure that it complies with the IEEE 802.3-2008 standards.
The switch includes 20 slots for 40G QSFP+ fiber-optic transceivers.
Note that all 40GBASE fiber optic ports can operate in a single-lane mode at
40 Gbps full duplex, or in a four-lane mode at 10 Gbps full duplex.
Table 14: Maximum 40 Gigabit Fiber Cable Lengths
Fiber Size
10GBASE-SR4
62.5/125 micron multimode
62.5/125 micron multimode
50/125 micron multimode
50/125 micron multimode
50/125 micron multimode
Note:
The length of fiber optic cable for a single switched link should not exceed
the relevant standards specified in this section. However, power budget constraints
should also be considered when calculating the maximum fiber optic cable length
for a particular link.
Note:
Maximum distances may vary for different QSFP+ vendors.
MDI-X Signal Name
Bi-directional Pair A Minus (BI_DA-)
Bi-directional Pair C Plus (BI_DC+)
Bi-directional Pair C Minus (BI_DC-)
Fiber Bandwidth
Maximum Cable Length
160 MHz/km
2-26 m (7-85 ft.)
200 MHz/km
2-33 m (7-108 ft.)
400 MHz/km
2-66 m (7-216 ft.)
500 MHz/km
2-82 m (7-269 ft.)
2000 MHz/km
2-300 m (7-984 ft.)
– 44 –
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