Dell EMC Networking Optical or AOC Module Insertion Stop Failure When Inserting QSFP28-DD Transceiver in S5248F Switch

Description

One QSFP28-DD port, port-49 in some S5248F switch units may experience insertion stop issues when AOC cable or QSFP+/QSFP28 optical module is used. Such an issue has been determined to be caused by a combination of the module end that comes with a sharp edge at the top protruding piece of the module backshell. The edge is not chamfered to round off the edge. See the diagrams with proper chamfer (red circle in the first diagram) vs without chamfer in the red circle of the second transceiver diagram below. It shows the top port-49 cage heatsink exerting a downward force on the module during insertion.  



Mechanical drawing diagram of transceiver module with chamfer shown in the red circle.

Solution

See below figures, one with proper, full insertion or mating of an AOC cable (Figure 1), while another shows insertion stop failure (Figure 2).

Full insertion or mating of 100G AOC cable in port-49 of S5248F


Figure 1

Insertion stop failure of a 100G AOC cable in port-49 of S5248F


Figure 2

See the video below as a guide to show the proper way to insert an optical module into the QSFP-DD port, port-49 in S5248F.