2 Operation on an Ethernet access
ARGUS
9
Autonegotiation / Ethernet link parameter
The default setting supports "autonegotiation" for the Ethernet link.
Setting: Autonegotiation "on"
When negotiating the link parameters, the ARGUS notifies the remote end that the follow-
ing is supported (these settings are fixed; they cannot be reconfigured):
-
10, 100 or 1000 Mbit/s
-
half or full-duplex
-
Flow control on / off (when on: sym. and asym. pause)
Manual setting of the Ethernet link parameters
Setting: Autonegotiation "off"
When "autonegotiation" is deactivated, the speed, duplex mode, flow control (flow control =
"Pause" mode) are set in the profile (s. page 7):
-
10, 100 or 1000 Mbit/s, Default setting:
100 Mbit/s
-
half or full-duplex, Default setting:
Full
-
Flow control on / off (flow control is only reasonable when operating in full duplex),
Default setting:
on
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.
