The = (equals) at the end of any Cisco part number indicates that the part can be ordered as a spare part i.e., it doesn't have to be part of a factory built system. From a technical perspective, the N7K-F248XT-25 and N7K-F248XT-25= are exactly the same.
The 25 at the end of the ID for this particular module indicates that it is a Fabric 2 based module, and that five Fabric Modules are required for the device to operate at full line rate. I mentioned how the I/O module names can be interpreted in the forum post Bandwidth distribution in Nexus 7009 Fabric-2 module, but included here also:
The I/O module name is essentially comprised of a number of fields in the format N7K-ABCCDE-FG, where:
A = I/O module family e.g., M or F
B = generation of the module e.g., either 1, 2 or 3
CC = number of ports on the module e.g., 2, 6, 8, 24, 32 or 48
D = port speed e.g., G=10/100/1000, X=10G, F=40G or C=100G
E = connector type e.g., T=RJ45, S=SFP, 2=X2, P=SFP+, Q=QSFP or F=CFP
F = the Fabric ASIC version of the I/O module e.g., either 1 or 2
G = the number of Fabric modules required for full line rate I/O
Introduction This article will help you understand the steps on how to
download the UCS licenses from the Cisco Systems website and then
installing it on the UCS. The redacted (blue lines) just covers up
certain numbers for privacy please do not take them...
Introduction This article will help you understand and educate the
customer on how to clear their "expired licenses"
(license-graceperiod-expired) from their UCS-M. If a customer just
purchased a license and needs a step by step guide on how to download
==================== VIC FNIC driver does not support Virtual Volumes (
second level LUN ID ) An enhancement request has been created to track
this feature - CSCux64473 UPDATE - 12-14-2016 We made some traction on
the enhancement request - The Fix is in t...