Hi, Yes you can limit that to QSFP+ for 40Gb. Page 197 [URL] You can use QSFP+ transceivers and not need a breakout.
Hello, we intend to uplink S5248F-ON TOR to a Cisco C9272Q switch which supports only 40GE QSFP+ ports.  What options do we have to downgrade the QSFP28 and connect it to QSFP+ Do these 4xQSFP28 ports support Dell QSFP+ transceivers or breakout 40GbE is needed?   Let us know.   Best regards, GP
S5248F-ON uplink to QSFP+ options