User manual

ONFIGURING

THE

WITCH

3-84

- 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

1000BASE-T – 10half, 10full, 100half, 100full, 1000full;

SFP – 1000full)

• Forced Mode – Shows the forced/preferred port type to use for the

combination ports

9-12.

- Copper-Forced - Always uses the built-in RJ-45 port.

Copper-Preferred-Auto

- Uses the built-in RJ-45 port if both

combination types are functioning and the RJ-45 port has a valid

link.

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.

• Trunk – Indicates if a port is a member of a trunk. To create trunks

and select port members, see “Creating Trunk Groups” on page 3-85.

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

force the interface to use the Speed/Duplex Mode or Flow

Control options.