# Which Cables to be used for ConnectX-7? **URL:** \ **Category:** Ethernet Adapter Cards\ **Tags:** nics\ **Created:** [January 28, 2025, 2:10pm UTC](https://forums.developer.nvidia.com/t/which-cables-to-be-used-for-connectx-7/321710 "2025-01-28T14:10:51Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![amarnathpujari18](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@amarnathpujari18](https://forums.developer.nvidia.com/u/amarnathpujari18)\ **Post date:** [January 28, 2025, 2:10pm UTC](https://forums.developer.nvidia.com/t/which-cables-to-be-used-for-connectx-7/321710/1 "2025-01-28T14:10:51Z")
Device: ConnectX-7 200GbE / NDR200 P/N : MCX755106AC-HEAT When connected NIC card to Host , I am able to see ethernet entries as below, ```auto enp1s0f0np0: flags=4099 mtu 1500 ether 58:a2:e1:db:fb:28 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp1s0f1np1: flags=4099 mtu 1500 ether 58:a2:e1:db:fb:29 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 ``` but when I am using ethtool with any of two ethernet port, I see it says, “Link detected: no (No cable)” PFA log from ethtool, ```auto $ ethtool enp1s0f0np0 Settings for enp1s0f0np0: Supported ports: [] Supported link modes: 1000baseT/Full 10000baseT/Full 1000baseKX/Full 10000baseKR/Full 10000baseR_FEC 40000baseKR4/Full 40000baseCR4/Full 40000baseSR4/Full 40000baseLR4/Full 25000baseCR/Full 25000baseKR/Full 25000baseSR/Full 50000baseCR2/Full 50000baseKR2/Full 100000baseKR4/Full 100000baseSR4/Full 100000baseCR4/Full 100000baseLR4_ER4/Full 50000baseSR2/Full 1000baseX/Full 10000baseCR/Full 10000baseSR/Full 10000baseLR/Full 10000baseER/Full 50000baseKR/Full 50000baseSR/Full 50000baseCR/Full 50000baseLR_ER_FR/Full 50000baseDR/Full 100000baseKR2/Full 100000baseSR2/Full 100000baseCR2/Full 100000baseLR2_ER2_FR2/Full 100000baseDR2/Full 200000baseKR4/Full 200000baseSR4/Full 200000baseLR4_ER4_FR4/Full 200000baseDR4/Full 200000baseCR4/Full 100000baseKR/Full 100000baseSR/Full 100000baseLR_ER_FR/Full 100000baseCR/Full 100000baseDR/Full 200000baseKR2/Full 200000baseSR2/Full 200000baseLR2_ER2_FR2/Full 200000baseDR2/Full 200000baseCR2/Full Supported pause frame use: Symmetric Supports auto-negotiation: Yes Supported FEC modes: None RS BASER Advertised link modes: 1000baseT/Full 10000baseT/Full 1000baseKX/Full 10000baseKR/Full 10000baseR_FEC 40000baseKR4/Full 40000baseCR4/Full 40000baseSR4/Full 40000baseLR4/Full 25000baseCR/Full 25000baseKR/Full 25000baseSR/Full 50000baseCR2/Full 50000baseKR2/Full 100000baseKR4/Full 100000baseSR4/Full 100000baseCR4/Full 100000baseLR4_ER4/Full 50000baseSR2/Full 1000baseX/Full 10000baseCR/Full 10000baseSR/Full 10000baseLR/Full 10000baseER/Full 50000baseKR/Full 50000baseSR/Full 50000baseCR/Full 50000baseLR_ER_FR/Full 50000baseDR/Full 100000baseKR2/Full 100000baseSR2/Full 100000baseCR2/Full 100000baseLR2_ER2_FR2/Full 100000baseDR2/Full 200000baseKR4/Full 200000baseSR4/Full 200000baseLR4_ER4_FR4/Full 200000baseDR4/Full 200000baseCR4/Full 100000baseKR/Full 100000baseSR/Full 100000baseLR_ER_FR/Full 100000baseCR/Full 100000baseDR/Full 200000baseKR2/Full 200000baseSR2/Full 200000baseLR2_ER2_FR2/Full 200000baseDR2/Full 200000baseCR2/Full Advertised pause frame use: Symmetric Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Speed: Unknown! Duplex: Unknown! (255) Auto-negotiation: on Port: Other PHYAD: 0 Transceiver: internal Supports Wake-on: d Wake-on: d **Link detected: no (No cable)** ``` I am using below cable for connection, [QSFP DD Cable](https://www.amphenol-cs.com/product/njyye60002.html) I am looping back connectX-7’s both ports with this cable. Please help me with the correct cable to be used with connectX-7. Also what output should I expect when I connect correct cable to connectX-7 NIC card ? Thanks for helping in advance. /Amar ---
**Author:** ![MvB](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/mvb/32/367020_2.png) [@MvB](https://forums.developer.nvidia.com/u/MvB)\ **Post date:** [March 1, 2025, 12:43am UTC](https://forums.developer.nvidia.com/t/which-cables-to-be-used-for-connectx-7/321710/2 "2025-03-01T00:43:04Z")
Hello Amarnathpujari18, Thank you for posting your inquiry on the NVIDIA Developer Forum - Infrastructure and Networking - Section. Unfortunately, the cable you are using is not a validated/tested cable for the ConnectX-7 Please review the following link regarding the supported cables when using the ConnectX-7 adapter → [Validated and Supported Cables and Switches - NVIDIA Docs](https://docs.nvidia.com/networking/display/connectx7firmwarev28441036/validated+and+supported+cables+and+switches) Thank you and regards, ~NVIDIA Networking Technical Support ---
**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\ **Post date:** [March 15, 2025, 12:43am UTC](https://forums.developer.nvidia.com/t/which-cables-to-be-used-for-connectx-7/321710/3 "2025-03-15T00:43:38Z")
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