Ericsson ECN330, User Manual

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Configuring the ECN330-switch
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Note: The 1000BASE-T standard does not support forced mode. Auto-
negotiation must always be used to establish a connection over any
1000BASE-T port or trunk.
• Flow Control – Allows automatic or manual selection of flow control
(that is, with auto-negotiation disabled for Fast Ethernet ports).
• Autonegotiation (Port Capabilities) – Allows auto-negotiation to be
enabled/disabled. When auto-negotiation is enabled, the capabilities to
be advertised need to be specified. When auto-negotiation is disabled
for Fast Ethenet ports, the settings for speed, mode, and flow control
can be forced. Note that autonegotiation cannot be disabled for Gigabit
Ethernet ports, which only operate at 1000full (1 Gbps full-duplex). The
following capabilities are supported.
• 10half - Supports 10 Mbps half-duplex operation
• 10full - Supports 10 Mbps full-duplex operation
• 100half - Supports 100 Mbps half-duplex operation
• 100full - Supports 100 Mbps full-duplex operation
• 1000full - Supports 1000 Mbps full-duplex operation
• Sym (Gigabit only) - Check this item to transmit and receive pause
frames, or clear it to auto-negotiate the sender and receiver for
asymmetric pause frames. (The current ECN330-switch chip only
supports symmetric pause frames.)
• FC - Supports flow control.
Flow control can eliminate frame loss by “blocking” traffic from end
stations or segments connected directly to the ECN330-switch
when its buffers fill. When enabled, back pressure is used for half-
duplex operation and IEEE 802.3x for full-duplex operation. (Avoid
using flow control on a port connected to a hub unless it is actually
required to solve a problem. Otherwise back pressure jamming
signals may degrade overall performance for the segment attached
to the hub.)
(Default: Autonegotiation enabled
Auto-negotiation cannot be disabled for Gigabit Ethernet ports,
which only operate at 1000full (1 Gbps full-duplex).