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Default Configuration for Transceivers. The default configurations for the following high-speed
transceivers, which can be installed in your Series 2300 and 2500 switches, are as follows:
All transceivers, when installed in your Series 2300 and 2500 switches — the transceivers
operate only in full duplex mode; half-duplex mode is not available.
Gigabit-SX and Gigabit-LX transceivers — Auto. The speed and communication mode are set
at 1000 Mbps and full duplex, according to the standards, and the switch auto negotiates flow
control with the connected device.
100-FX — 100/Full. The port runs at 100 Mbps, full duplex.
100/1000-T — Auto. The communication mode is set at full duplex, the switch auto senses
the link speed, and auto negotiates the flow control and the port MDI/MDI-X operation.
Connecting the Transceivers to Devices with Fixed Configurations. For some older network
devices, including some older HP Procurve devices, the default for the Gigabit-SX and -LX ports is a
fixed configuration, for example 1000 Mbps/Full Duplex, or is otherwise different from these default
configurations for the transceivers. As a result, those devices may not connect properly to your Series
2300 and 2500 switches; you will not get a link. Additionally, if you connect the 100/1000-T Transceiver,
in its default configuration, to another device that has any fixed (non-Auto) configuration, you will
not get a link.
In summary, this is how the transceivers behave if connected to a device with a fixed configuration:
100-FX Transceiver — a good connection to a 100 Mbps/full duplex device; a link but very
poor performance if connecting to a 100 Mbps/half duplex device because of the resulting
duplex mismatch between your switch and the connected device.
Gigabit-SX and Gigabit-LX Transceivers — no link unless the transceiver configuration is
modified to match the fixed configuration of the connected device (configuration changes
possible on Series 2500 only); these devices operate only at full duplex according to the
standards.
100/1000-T Transceiver — no link unless the transceiver configuration is modified to match
the fixed configuration of the connected device (configuration changes possible on Series
2500 only), or the connected device is another HP Procurve switch configured to either the
Auto-100 or Auto-1000 options.
Make Sure the Configurations Match. Because of these default configuration and full-duplex
considerations, for best operation, you should make sure that the devices connected to the trans-
ceiver ports are configured the same as the default configurations shown above. At minimum, make
sure the configurations match. Note that for the Series 2300 switches, there is no console port, so
the configuration cannot be altered, and you must change the configuration on the connected device
to match the default configuration on your switch ports.
Changing Connection Speeds to the 100/1000-T Transceiver. If you connect the 100/1000-T
transceiver to a device that operates at one speed (for example 100 Mbps), and subsequently
disconnect from that device and connect to a device that operates at a different speed (for example
1000 Mbps), you must reset the Series 2300 or 2500 switch for the new speed to take effect. Until you
5968-2398-ed1a.fm Page 5 Tuesday, October 23, 2001 5:36 PM