Модуль 40G QSFP-40G->4xSFP+ DAC, дальность до 5м

День добрый. Соединяю данным кабелем Cisco WS-C3850-48XS-S (порт 40Gbit/s) с 3 собранными в стек коммутаторами SNR-S2995G-48FX (порты 10 Gbit/s). Линк не поднимается. Пробовал подключать к WS-C3850R-48-S на порт 10 Gbit/s модуля NM-2-10G - так же нет линка. в Cisco WS-C3850-48XS-S кабель определяется: NAME: "Fo1/1/1", DESCR: "QSFP 40G CR4 SFP" PID: Q220900830004 , VID: OEM , SN: Q220900830004 В SNR-S2995G-48FX модули тоже определяются: CKU-SFP#show transceiver interface Ethernet1/0/51 det Ethernet1/0/51 transceiver detail information: Base information: SFP found in this port, manufactured by OEM, on Sep 05 2022. Type is unknown. Serial number is Q220900830004. Link length is 5 m for Copper. Nominal bit rate is 10300 Mb/s. Brief alarm information: N/A Detail diagnostic and threshold information: N/A CKU-SFP#show transceiver interface Ethernet2/0/51 det Ethernet2/0/51 transceiver detail information: Base information: SFP found in this port, manufactured by OEM, on Sep 05 2022. Type is unknown. Serial number is Q220900830004. Link length is 5 m for Copper. Nominal bit rate is 10300 Mb/s. Brief alarm information: N/A Detail diagnostic and threshold information: N/A CKU-SFP#show transceiver interface Ethernet3/0/51 det Ethernet3/0/51 transceiver detail information: Base information: SFP found in this port, manufactured by OEM, on Sep 05 2022. Type is unknown. Serial number is Q220900830004. Link length is 5 m for Copper. Nominal bit rate is 10300 Mb/s. Brief alarm information: N/A Detail diagnostic and threshold information: N/A Может быть я чего-то не учитываю? Или всё-же кабель неисправен?