RTD Embedded Technologies, Inc.
|
www.rtd.com
15
LAN24550/
LAN34550 User’s Manual
5
Functional Description
Block Diagram
The Figure below shows the functional block diagram of the LAN25215/35215. The various parts of the block diagram are discussed in the
following sections.
Figure 7: LAN24550/345550 Block Diagram
Twisted Pair Connection
5.2.1
I
NTEL
X550
E
THERNET
C
ONTROLLER
The LAN
24550/34550 features Intel’s X550
-AT2 10 Gigabit Ethernet controller used to interface with twisted pair cable Ethernet connections.
The X550 is a converged network adapter that not only supports LAN traffic, but also FCoE and iSCSI. The integrated MAC and PHY drives
down power consumption and cost. Backward compatibility with existing Gigabit Ethernet (and Fast Ethernet) systems is provided by the auto-
negotiation feature which ensures that the highest possible link speed is used at all times.
5.2.2
T
WISTED
P
AIR
I
NTERFACE
The board provides two RJ-45 connectors for Ethernet connectivity. The pinout of the modular connectors should be according to ANSI/TIA-
568 standard. The 10GBASE-T link could be used up to 100 meters (330 feet) with at least CAT6a cable, and 55 meters (180 feet) with CAT6
cable (in accordance with the IEEE802.3an standard) Although unshielded cabling is accepted by the standards, RTD recommends using
shielded cables and connectors at all times because 10 Gigabit Ethernet is highly susceptible to external fields coupling into the cable. The
following guidelines should be followed when installing and using twisted pair cables, especially long ones:
-
Use shielded cables and connectors, for best performance double shielding (where individual pairs are also shielded) is recommended
(eg. SFTP)
-
Verify the continuity of the shield along the path, eliminate unshielded segments
-
Keep cable length and the number of connectors minimal
-
Use CAT7 (or better) cable
-
Minimize the length of unshielded and untwisted segments at the connectors
-
Test cabling with an analyzer before use
-
Avoid routing the cables close to high current/high voltage lines
-
For long distances, use solid core cable (wall cable)
PC
Ie
b
us conn
ecto
r
PCIe x4 Gen3
Intel X550-AT2
Ethernet Controller
RJ45
connector
RJ45
connector
Power
supply
