SMC Networks SMC6752AL2 Manual De Usuario

3-91

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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 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 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 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; Advertised capabilities for  
100BASE-TX – 10half, 10full, 100half, 100full;  1000BASE-T – 
10half, 10full, 100half, 100full, 1000full; 1000BASE-SX/LX/LH – 
1000full)

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Trunk – Indicates if a port is a member of a trunk. To create trunks 
and select port members, see “Creating Trunk Groups” on page 3-92.

Note: Auto-negotiation must be disabled before you can configure or 

force the interface to use the Speed/Duplex Mode or Flow 
Control options.