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Network Planning
Connectivity Rules
1000 Mbps
Gigabit Ethernet
34
When adding hubs (repeaters) to your network, please follow the
connectivity rules listed below for Ethernet and Fast Ethernet. However,
note that because switches break up the path for connected devices into
separate collision domains, you should not include the switch or
connected cabling in your calculations for cascade length involving
other devices.
Maximum Gigabit Fiber Optic Cable Distance
The AT-B15/SX has one 1000Base-SX fiber optic port with a SC
connector. This module operates at 1Gbps and supports auto-
negotiation for duplex mode (half- or full-duplex) and flow control. Refer
to Table 2 for the cabling specifications for this module.
Table 2 Cabling Specifications for the AT-B15/SX Expansion Module
Cable
62.5/125 micron
multimode fiber
50/125 micron
multimode fiber
Note
Although maximum cable length for 100Base-FX fiber depends on
the duplex mode, the maximum length for 1000Base-SX fiber is the
same for both half- and full-duplex.
Fiber Bandwidth
160 MHz/km
200 MHz/km
400 MHz/km
500 MHz/km
Maximum Cable
Length
2-220 m (7-722 ft)
2-275 m (7-902 ft)
2-500 m (7-1641 ft)
2-550 m (7-1805 ft)
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