RJ-45 LAN Port 46
RJ-45 LAN Port 4
IEEE 1394 Port 4
The IEEE 1394 ports on the Tablet PC and the Tablet
Dock conform to IEEE 1394 standards.
IEEE 1394 cable characteristics follow:
• Suggested maximum cable length: 4.5 meters
• 110 ohms characteristic impedance - differential
mode
• 33 ohms characteristic impedance - common mode
• Relative propagation skew <
400ps @ 100 MHz and
<
100ps @ 400 MHz (the difference between the
differential mode propagation delay of the two
twisted pair conductors that must be measured in
the frequency domain).
• TPA to TPB crosstalk <
-26dB (within 1 MHz to
500 MHz range)
• Signal velocity equal to or less than 5.05ns/meter
• Signal pair attenuation:
100MHz = <2.3dB
200MHz = <3.2dB
400MHz = <5.8dB
Table 4-10. LAN Port Pin Assignments
Note: The following table is correct for 10Base-T and 100Base-Tx, but not for
1000Base-T. For 1000Base-T pin assignments, go to one of the following Web sites:
http://www.foundrynet.com/services/documentation/EI48G/b_48Gcables.html
http://home.cfl.rr.com/bjp/RJ45pins.htm
Pin Signal Remarks
1 TX+ Transmit +
2 TX- Transmit -
3 RX+ Receive +
4 NC Not used
5 NC Not used
6 RX- Receive -
7 NC Not used
8 NC Not used
12345678
The IEEE 1394 and USB ports on the Tablet
Dock are independent ports (i.e., they are not
pass-through ports).
Table 4-11. IEEE 1394 Connector Pin Assignments
Pin Signal Remarks
1 TPB- Twisted Pair B - differential
signal
2 TPB+
3 TPA- Twisted Pair A - differential
signal
4TPA+
1234
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