3Com 3C780 User Guide - Page 62
Transmit, Transmit, Not used, Receive, Receive
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2-22 Installing the Hub Table 2-2. RJ-45 UTP Connector Pin Assignments Pin No. 1 2 3 4 5 6 7 8 Function Transmit (+) Transmit (-) Not used Not used Not used Not used Receive (+) Receive (-) NOTE: To minimize RF emissions, the connector shell must be connected to hub ground. Also, the connector shell must completely surround the cable shield. Cross-over cable LinkBuilder FDDI hub 23 ft / 7 m maximum Punchdown block 295 ft / 90 m maximum Wall jack 10 ft / 3 m maximum FDDI end station Figure 2-8. UTP Cabling Distances per ANSI Standards
2-22
Installing the Hub
Table 2-2.
RJ-45 UTP Connector Pin Assignments
Pin No.
Function
1
Transmit (+)
2
Transmit (–)
3
Not used
4
Not used
5
Not used
6
Not used
7
Receive (+)
8
Receive (–)
NOTE:
To minimize RF emissions, the connector shell must be connected to hub
ground.
Also, the connector shell must completely surround the cable shield.
LinkBuilder FDDI hub
23 ft / 7 m maximum
Punchdown block
295 ft / 90 m maximum
Wall jack
10 ft / 3 m maximum
FDDI end station
Cross-over cable
Figure 2-8.
UTP Cabling Distances per ANSI Standards