ADTRAN NetVanta 1748F Series, Hardware Installation Manual

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Port Connections ADTRAN 1748F Switch
34 Copyright © 2016 ADTRAN, Inc. 61700558F1-34B
Figure 16. Connecting to a QSFP+ Transceiver
DAC Connections
Direct Attach Cable (DAC) is a method of connecting two SFP+/QSFP+ interfaces without using optics and
fiber cable. A fixed length of twinaxial copper cable is terminated at each end with physically-compliant
SFP+/QSFP+ transceivers that do not include all their normal electronic and optical components. The result is a
low cost, low-latency, 10G/40G Ethernet solution for short distances, ideal for connections within the data
center.
A 10G DAC connection is also known as twinaxial copper or 10GBASE-CR. DAC copper cables are available
in pre-terminated lengths up to 5 m (16.4ft).
Table 10. Maximum 10GBASE-CR 10 Gigabit Ethernet Cable Lengths
Table 11. Maximum 40GBASE-CR4 40 Gigabit Ethernet Cable Lengths
Cable Type Cable Lengths Connector
Pre-terminated Direct Attach Cable
(DAC) — (twinaxial copper cable) 1 m (3.28 ft)
3 m (9.8 ft)
5 m (16.4 ft)
SFP+
Cable Type Cable Lengths Connector
Pre-terminated Direct Attach Cable
(DAC) — (twinaxial copper cable) 1 m (3.28 ft)
2 m (6.56 ft)
3 m (9.8 ft)
5 m (16.4 ft)
QSFP+
OSFP+ Fiber Optic Cable
QSFP+ Transceiver Port