The Cobalt UDX-SFP-4S is a small daughter board and is required where a 4-slot ("Double-Width") rear module (such as RM20-9904-C-HDBNC, RM20-9904-F-HDBNC, or RM20-9904-K-HDBNC) is to be fitted with an SFP option. Rear modules RM20-9904-C-HDBNC, RM20-9904-F-HDBNC,RM20-9904-G-HDBNC, RM20-9904-K-HDBNC and option -UDX-SFP-2S or -UDX-SFP-4S are available separately.
Please Note: UDX-SFP-4S must be ordered at the same time as the main card, (i.e 9904-UDX-4K), Cobalt Digital will factory install it. It allows the addition of fiber SFPs of your choice. It also mandates that the rear I/O chosen allow for fiber SFPs to poke through. It can never be ordered on its own.