Filter
Top Products
Points to Note when using the Switch 3226 and Switch 3250 13
Combination Ports
■ The two 10/100/1000 ports are combination ports.
When an SFP module is inserted it has priority over
the 10/100/1000 port of the same number. The
corresponding 10/100/1000 port is disabled. The
combination ports are numbered 25-26 on the
Switch 3226 and 49-50 on the Switch 3250.
Supported SFP Modules
■ 3CSFP91 — SFP 1000BASE–SX
■ 3CSFP92 — SFP 1000BASE–LX
■ 3CSFP97 — SFP 1000BASE–LH70
Start-up Time
■ The unit will take approximately 2 minutes to
become fully operational. The unit is fully
operational when the Self Test LED is lit solid green
Autonegotiation of Port Speed and Duplex
All ports on the unit default to using autonegotiation
to determine the correct speed and duplex setting. If
the link partner also supports autonegotiation then
this will result in the optimum link speed and duplex.
The speed and duplex of the port may be manually
set by using the physicalInterface ethernet
portMode command to disable autonegotiation and
select a fixed speed and duplex.
When autonegotiation is enabled, the unit asks for a
fallback mode to be entered for use when the port
connects to a non-autonegotiation device. This
fallback mode parameter has been left in the CLI for
compatibility with other 3Com devices but is ignored
by this device.
When connected to a device that will not
autonegotiate the device follows the algorithm
required by the autonegotiation standard which
states that ports must detect the link speed and then
operate in half duplex mode.
Auto-MDIX is not available if auto-negotiation is
disabled on a port. That port will only operate in
MDIX mode.
LACP Protocol
■ The LACP protocol is disabled by default. Some
legacy devices do not support LACP and 3Com
strongly recommends LACP remains disabled on
ports connected to these devices (in rare cases, if
LACP is enabled on ports connected to these
devices, it can result in incorrect network
configurations).
Web Interface
■ Many Web browsers can be configured to ignore
stylesheets, substituting user configured fonts and
font sizes. Ignoring stylesheets may cause
unpredictable effects when accessing the Web
interface. 3Com recommends that you enable
stylesheets on browsers used to access the Web
interface of the Switch.