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Description of Hardware
1-3
1
Each port also supports IEEE 802.3x auto-negotiation of flow control
3
, so the switch
can automatically prevent port buffers from becoming saturated.
1000BASE-T/SFP Ports
These are combination Gigabit RJ-45 ports with shared Small Form Factor
Pluggable (SFP) transceiver slots (See Figure 1-1, Ports 25-26/49-50). If an SFP
transceiver (purchased separately) is installed in a slot and has a valid link on the
port, the associated RJ-45 port is disabled.
The 1000BASE-T RJ-45 ports support automatic MDI/MDI-X operation, so you can
use straight-through cables for all network connections to PCs or servers, or to other
switches or hubs. (See “1000BASE-T Pin Assignments” on page B-3.)
3. Flow control is only supported for ports attached to the same switch ASIC. The MIL-SM4804G
has two switch chips– ASIC#1: Ports 1-12, 25-36, 49, 51 and ASIC#2: Ports 13-24, 37-48, 50,
52.