CE 6855-48-T6Q-HI Stacking

Hi @yogijain,
1) Stack cable specification for 40G uplink
For CE6800 series switch, it support all ports except GE ports to be used for stack connections. So, you can choose cooper cable or fiber cable to build the stack. The supported cooper cable and transceiver is listed at https://support.huawei.com/hedex/hdx.do?docid=EDOC1100054000&id=EN-US_CONCEPT_0138782020&lang=en

2) Stack configuration
Please refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100054000&id=EN-US_TASK_0141117112&lang=en

3) can we use quad QSFP+ TO 4SFP+ cable as a stack cable
If you mean whether the 10GE optical ports split from 40GE optical ports on devices can be used for stack connections, the answer is yes. But if 40GE optical ports have been configured as stack member ports, these ports cannot be split.