3Com 3C780 User Guide - Page 61

Pin No., Function

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Installing the Hub 2-21 Table 2-1. DB-9 STP Connector Pin Assignments Pin No. 1 2 3 4 5 6 7 8 9 Function Transmit (+) Not used Not used Not used Receive (+) Transmit (-) Not used Not used Receive (-) Unshielded Twisted-Pair Cable s The standard UTP cabling type supported by the LinkBuilder FDDI Workgroup Hub is category 5 screened UTP cross-over cable with screened RJ-45 connectors, as specified by ANSI X3T9.5. The cross-over cable connections and color scheme are shown in Figure 2-7. s The maximum length of this cable from the hub to any potential end station is 100 m (328 ft). The cross-over cable connects the LinkBuilder FDDI hub and the punchdown block. ANSI standards specify the operating distances, as shown in Figure 2-8. s The pin assignments for the type RJ-45 FDDI unshielded twisted-pair interface connector are shown in Table 2-2. Brown 1 Green 2 Blue 3 Orange 4 5 Orange 6 Blue 7 Green 8 Brown Figure 2-7. Cross-over Connections on a UTP Cable

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2-21
Installing the Hub
Table 2-1.
DB-9 STP Connector Pin Assignments
Pin No.
Function
1
Transmit (+)
2
Not used
3
Not used
4
Not used
5
Receive (+)
6
Transmit (–)
7
Not used
8
Not used
9
Receive (–)
Unshielded Twisted-Pair Cable
■
The standard UTP cabling type supported by the LinkBuilder FDDI
Workgroup Hub is category 5 screened UTP cross-over cable with
screened RJ-45 connectors, as specified by ANSI X3T9.5.
The cross-over
cable connections and color scheme are shown in Figure 2-7.
■
The maximum length of this cable from the hub to any potential end station
is 100 m (328 ft).
The cross-over cable connects the LinkBuilder FDDI
hub and the punchdown block.
ANSI standards specify the operating
distances, as shown in Figure 2-8.
■
The pin assignments for the type RJ-45 FDDI unshielded twisted-pair
interface connector are shown in Table 2-2.
5
1
6
2
7
3
8
4
Brown
Green
Blue
Orange
Brown
Green
Orange
Blue
Figure 2-7.
Cross-over Connections on a UTP Cable