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ADTRAN 1748F Switch
Table 9. 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
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.
• 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.
• 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.
Instructions for Connecting to QSFP+ Fiber Optic Ports
Step
1
Remove and keep the fiber port's rubber cover. When not connected to a fiber cable, the rubber
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.
3
Connect one end of the cable to the QSFP+ port on the switch and the other end to the QSFP+
port on the other device. Since QSFP+ connectors are keyed, the cable can only be attached in
the correct orientation (see
4
As a connection is made, check the Link LED on the switch corresponding to the port to be sure
that the connection is valid.
Be sure to secure cables properly and route them away from the switch without exceeding
the minimum bending radius for fiber cables (typically a few inches). Use cable ties to
bundle cables together and secure coiled loops of excess cable. Do not let cables hang free
supporting their own weight or pull in any way that puts stress on the connectors.
61700558F1-34B
Fiber Bandwidth
160 MHz/km
200 MHz/km
400 MHz/km
500 MHz/km
2000 MHz/km
Action
Figure 16 on page
34).
Copyright © 2016 ADTRAN, Inc.
Maximum Cable Length
2-26 m (7-85 ft.)
2-33 m (7-108 ft.)
2-66 m (7-216 ft.)
2-82 m (7-269 ft.)
2-300 m (7-984 ft.)
Port Connections
Connector
LC
LC
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