Can't get IQ data after cell setup

[xueying-995]

Hello,
our environment is Open5GS, srsRAN gNB and Benetel, run the configuration to create 100MHz NR cell as below,
./apps/gnb/gnb -c gnb.yml -c mimo.yml
And see the message as below,

--== srsRAN gNB (commit 4ac5300d4) ==--


The PRACH detector will not meet the performance requirements with the configuration {Format 0, ZCZ 0, SCS 1.25kHz, Rx ports 1}.
N2: Connection to AMF on 172.22.0.10:38412 completed
Cell pci=1, bw=100 MHz, 2T1R, dl_arfcn=623340 (n78), dl_freq=3350.1 MHz, dl_ssb_arfcn=620640, ul_freq=3350.1 MHz

Initializing the Open Fronthaul Interface for sector#0: ul_compr=[BFP,9], dl_compr=[BFP,9], prach_compr=[BFP,9], prach_cp_enabled=false, downlink_broadcast=false
Warning: Configured PRACH occasion collides with PUCCH RBs ([0..1) intersects [0..3)). Some interference between PUCCH and PRACH is expected.
Warning: Configured PRACH occasion collides with PUCCH RBs ([0..1) intersects [0..3)). Some interference between PUCCH and PRACH is expected.
==== gNB started ===

Then capture the pcap file by using command ' tcpdump -i eth0 -w file.pcap' , and decoded it with Wireshark,
All PRB's IQ data is 0. I'm wondering if srsRAN create IQ data after cell setup? if it can create IQ data, does it depend on the other configuration or RF hardware?