3Com 3800 - Manual (Page 21)

Summary of Features 1-3
Port Connections The Switch 3800 has 24 autosensing 10BASE-T/100BASE-TX ports with
standard RJ-45 connectors, and supports one Gigabit Ethernet port,
and one redundant Gigabit Ethernet port with standard Gigabit
Interface Connectors (GBICs). You must have a 3Com-approved GBIC
module (such as 3C16911) inserted to make use of these ports. You
can connect other Gigabit Ethernet devices (such as 10/100 Switches
that have Gigabit Ethernet modules) to the Switch 3800. You can also
connect Switch 3800 devices to each other.
10BASE-T/100BASE-TX ports are configured as MDIX (crossover). A
crossover cable will typically be needed to connect these ports to
another 3Com Switch.
Full-duplex The Switch 3800 provides full-duplex support for all ports. Full-duplex
allows frames to be transmitted and received simultaneously and, in
effect, doubles the bandwidth available on a link. All 10/100 Mbps
ports on the Switch 3800 autonegotiate for half- or full-duplex
operation.
Port Redundancy The Switch 3800 has an optional redundant Gigabit Ethernet port to
provide resilient links. Using the redundant port (the redundant port is
labeled 25-Standby), you can dual-home to one or two Switches.
Figure 1-1 illustrates a Switch 3800 dual-homed to two different
Switches.
Figure 1-1 Dual-homing configuration
Dual-homed
Standby Main
SW3800.BK Page 3 Tuesday, May 5, 1998 5:20 PM