28 Keysight S5040A Open RAN Studio Player and Capture Appliance User’s Guide
2 Getting Started
Figure 9 QSFP28 to SFP28 adapter with Bi-directional SFP28
Figure 10 QSFP28 to SFP28 adapter with 10GBASE-T Copper
2.0.1: Cable types
For the connectivity option shown in Figure 6, the MTP Female to 4 x LC (8
Fibers) Duplex Multi-mode Type B Breakout Cables are shown in
Figure 11. Type B indicates that it crosses over Tx and Rx in the fibers as
required.
These cables are required to connect from a QSFP28 100GBASE-SR4
modules. The four fiber pairs, which are available with the LC connectors,
are labeled 1 to 4, which correspond to the four Ethernet lanes in the
QSFP28 module. Table 9 shows the mappings of the lanes to fibers.
Note that there a 12 fibers in the MPO connector. Each lane has two fibers
for Tx / Rx. For a QSFP28-to-QSFP28 connection, where the O-DU and
O-RU are QSFP28 100GBASE-SR4, connected using a 12 Fiber, OM4,
Type B, MTP Female to MTP Female connector. Type B specifies that Tx
and Rx are crossover. Note that for 25G/100G Ethernet, fibers 5 to 8 are
not used.
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