Introduced May 2017
Actually a family of four (or five) switches with either 28 or 48 access ports and either SFP+ or Tw-pair. There is a fifth varient that includes fiber channel and 48 SFP+ access ports. Cumulusnetworks says in their hardware compatibility matrix that this is a Broadcom Maverick.
These switches are the topic of an Oct 2017 Tolly report at http://tolly.com/DocDetail.aspx?DocNumber=217126 that contains some useful information. Quoting the relevant parts:
The Dell EMC switches use a common packet buffer that is shared across all ports of a given switch on a dynamic basis. These buffers can be used to prevent packet loss by buffering packets where an output port is momentarily oversubscribed. Tolly engineers determined that the port buffer capacity of each of the switches was eight MB.
and at the end of the report
To saturate the switch port buffers, engineers configured Ixia to provide one line-rate traffic stream destined for a single port. Engineers created a separatge traffic burst destined to this fully-loaded port, and verified that after traffic was stopped, that all packets were received.
12 port family members
In January 2019 Dell added two S4112 12-port switches to the product line. The family data sheet has been revised to cover the new entries.