Edge-Core ES4524M-PoE, Management Manual, Page: 147 / 560

Port Configuration
3-103
• Flow Control – Allows automatic or manual selection of flow control (that is, with
auto-negotiation disabled).
Flow control can eliminate frame loss by “blocking” traffic from end stations or
segments connected directly to the switch when its buffers fill. When enabled, back
pressure is used for half-duplex operation and IEEE 802.3-2005 (formally
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.
• Autonegotiation (Port Capabilities) – Allows auto-negotiation to be enabled/
disabled. When auto-negotiation is enabled, you need to specify the capabilities to
be advertised. When auto-negotiation is disabled, you can force the settings for
speed, mode, and flow control. 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 1 Gbps 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 switch chip only supports symmetric pause frames. )
- FC - Supports flow control
(Default: Autonegotiation enabled; Advertised capabilities for 1000BASE-T –
10half, 10full, 100half, 100full, 1000full; 1000BASE-SX/LX/LH – 1000full)
• Media Type – Configures the forced/preferred port type to use for the combination
ports. (Ports 23-24)
- Copper-Forced - Always uses the built-in RJ45 port.
- SFP-Forced - Always uses the SFP port (even if module is not installed).
- SFP-Preferred-Auto - Uses SFP port if both combination types are functioning
and the SFP port has a valid link. (This is the default.)
• Trunk – Indicates if a port is a member of a trunk. To create trunks and select port
members, see “Creating Trunk Groups” on page 3-105.