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9 Operation on an Ethernet Access
158
ARGUS 145
PLUS
9.3 Autonegotation / Ethernet Link Parameters
The Ethernet link "autonegotiation" is supported by the default setting.
When negotiating the link parameters, the ARGUS notifies the remote end that the
following are supported (these settings are fixed; they cannot be reconfigured):
-
10 and 100 Mbit/s
-
Half and full duplex
-
Flow control on / off (when on: sym. and asym. pause)
Manual setting of the Ethernet link parameters
When "autonegotiation“ is deactivated, the speed, duplex mode, flow control (flow control =
"Pause" mode) are set in the profile (see page 153). The ARGUS the following can
configured:
-
10 and 100 Mbit/s
-
Half and full duplex
-
Flow control on / off (flow control is only reasonable when operating in full duplex)
One-sided Autonegotiation
If a device which has autonegotiation enabled (on) attempts to connect to a
device on which autonegotiation is disabled (off) or not supported, no information
will be exchanged with the remote end. The speed will still be determined even without
autonegotiation by listening for NLP signals (10Base-T) or a 100Base-TX idle pattern
(parallel detection). In this case, the device using autonegotiation will generally fall back to
half duplex (duplex mismatch is possible). This may lead to a conflict between the duplex
modes with "poorer" performance.