Making Connections - 3Com Hub 1000 SX User Manual

3
Table 3-1 Gigabit Ethernet Maximum Cable Lengths
Laser
Signal Type Wavelength
1000BASE-SX Short
(850 nm)
1000BASE-LX * Long
(1300 nm)
1000BASE-CX N/A
* The 1000BASE-LX GBIC module requires an external patch cord for connection to MMF cable.
M C
AKING
This chapter contains guidelines for making typical Hub 1000 SX network
connections and for troubleshooting problems with the hub.
When making hub connections, follow the rules for maximum cable
lengths, which are summarized in Table 3-1. If you connect 10/100 Mbps
devices to the network, rules for Ethernet and Fast Ethernet connections
also apply.
50/125
Connector Multimode
Type Fiber
SC 550 meters
SC 550 meters
HSSDC N/A
CAUTION: Connecting the downlink of one Hub 1000 SX to the uplink
of a second Hub 1000 SX degrades the performance of the second hub.
CAUTION: Connecting a Gigabit Ethernet switch downlink to a
Hub 1000 SX downlink degrades the performance on the link to
the switch.
ONNECTIONS
Cable Type
62.5/125
Multimode Single-Mode
Fiber Fiber
260 meters N/A
440 meters 3 kilometers
N/A N/A
Shielded
Balanced Pair
(Coaxial Jumper)
N/A
N/A
25 meters