http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/catalyst-4500-series-line-cards/product_data_sheet0900aecd802109ea.htmlWS-X4712-SFP-E:
● 12 Port nonblocking SFP line card, providing 12 gigabits per-slot capacity
● Cisco IOS Software Release IOS-XE3.5.0E/15.2(1)E or later
● Support 1G/100FX SFP (mix and match as well) at line rate
● IEEE 802.1AE Fiber Encryption and Cisco TrustSec capability in hardware
● L2-4 Jumbo Frame support (up to 9216 bytes)
● Inherits Supervisor Engine QoS capability
● Supported on all 3, 6, 7 (R-E & R+E) and 10 (R-E & R+E) slot chassis
● Enterprise, mid-market, and commercial core and distribution deployments requiring line-rate capability
● Service provider: GE aggregation for DSLAM/PON/mobile data backhaul
Figure 8 shows the WS-X4624-SFP-E.