3Com V6100, User Manual Manual, Page: 263 / 496

V6100 and V7122 User Guide
263
C
HAPTER
9: N
ETWORKING
C
APABILITIES
Ethernet Interface Configuration
Using the parameter ‘EthernetPhyConfiguration‘, users can control the Ethernet connection
mode.
Either the manual modes (10 Base-T Half-Duplex, 10 Base-T Full-Duplex, 100 Base-TX Half-
Duplex, 100 Base-TX Full-Duplex) or Auto-Negotiate mode can be used.
Auto-Negotiation falls back to Half-Duplex mode when the opposite port is not Auto-
Negotiate, but the speed (10 Base-T, 100 Base-TX) in this mode is always configured
correctly. Note that configuring the gateway to Auto-Negotiate mode while the opposite port
is set manually to Full-Duplex (either 10 Base-T or 100 Base-TX) is invalid (as it causes the
gateway to fall back to Half-Duplex mode while the opposite port is Full-Duplex). It is also
invalid to set the gateway to one of the manual modes while the opposite port is either Auto-
Negotiate
or not exactly matching (both in speed and in duplex mode). Users are
encouraged to always prefer Full-Duplex connections to Half-Duplex ones and 100 Base-TX
to 10 Base-T (due to the larger bandwidth). It is strongly recommended to use the same
mode in both link partners. Any mismatch configuration can yield unexpected functioning of
the Ethernet connection.
When remote configuration is performed, the gateway should be in the correct
Ethernet setting prior to the time this parameter takes effect. When, for example,
the gateway is configured using BootP/TFTP, the gateway must perform many
Ethernet-based transactions prior to reading the
ini file containing this gateway
configuration parameter.
To work around this problem, the gateway always uses the last Ethernet setup mode
configured. This way, if users want to configure the gateway to work in a new network
environment in which the current Ethernet setting of the gateway is invalid, they should first
modify this parameter in the current network so that the new setting holds next time gateway
is restarted. After reconfiguration has completed, connect the gateway to the new network
and restart it. As a result, the remote configuration process that takes place in the new
network uses a valid Ethernet configuration.