D-Link DES-1200M - Manual (Page 16)

DES-121G/GL 1000Base-SX/LX Fiber Module
Figure 1-10. 1000Base-SX/LX Front View
When installed into a DES-1200M, the DES-121G/GL
1000Base-SX/LX Module provides 1 Gigabit Ethernet ports
which can connect the DES-1200M to a Gigabit Backbone
Switch or Server with Gigabit NIC.
DES-121G/GL 1000Base-SX/LX Fiber Module Features
Conforms to IEEE 802.3z draft 4.2 and 802.3x standard
1x1000Base-SX/LX Ethernet Port
3M memory buffer support
Standard auto-negotiation for speed, duplex mode and
flow-control for MII and GMII PHYs
Backpressure option and Limit4 option for half duplex
Automatic address learning with 4K address entry storage
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