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Chapter 5
| Port Connections
How to Connect to QSFP+ Fiber Optic Ports
How to Connect to QSFP+ Fiber Optic Ports
Connection Procedure
The switch includes four slots for 40 Gigabit Ethernet QSFP+ fiber-optic
transceivers. Note that 40G fiber optic ports can provide either one 40 Gbps full-
duplex link, four independent 10G fiber optic links. Connecting a 40G QSFP+ port
to four 10G SFP+ ports requires the use of a breakout cable.
Table 8: Maximum 40 Gigabit Ethernet Fiber Cable Lengths
Fiber Size
40GBASE-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.
Follow these steps to connect cables to QSFP+ transceiver ports.
Warning:
This switch uses lasers to transmit signals over fiber optic cable. The
lasers are compliant with the requirements of a Class 1 Laser Product and are
inherently eye safe in normal operation. However, you should never look directly at
a transmit port when it is powered on.
Warning:
When selecting a fiber QSFP+ device, considering safety, please make
sure that it can function at a temperature that is not less than the recommended
maximum operational temperature of the product. You must also use an approved
Laser Class 1 QSFP+ transceiver.
1.
Remove and keep the port's protective cover. When not connected to a fiber
cable, the cover should be replaced to protect the optics.
2.
Check that the fiber terminators are clean. You can clean the cable plugs by
wiping them gently with a clean tissue or cotton ball moistened with a little
ethanol. Dirty fiber terminators on fiber cables will impair the quality of the
light transmitted through the cable and lead to degraded performance on the
port.
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.)
– 42 –
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