Avaya P550 manual Speed Mode, Duplex Mode, Flow Control, Speed/Duplex, Advertisement

Chapter 2

Table 2-4. Fast Ethernet (10/100) Port Parameters

Parameter	Definition
Speed Mode	Allows you to select the speed of the port manually
	(to either 10 or 100 Mbps).
	Note: If auto-negotiation is enabled, this setting
	is ignored.
Duplex Mode	Allows you set the port duplex mode (half- or full-
	duplex).
	Note: If auto-negotiation is enabled, this setting
	is ignored.
Flow Control	Determines whether flow control is used on this
Mode	port. For half-duplex links, active backpressure
	jams the sending Ethernet channel until the port’s
	buffers can receive more packets. This prevents lost
	or dropped packets.
	For full-duplex links, IEEE 802.3z pause control
	allows the port to stop a sending station from
	sending more packets if the receiving port’s buffers
	are full.
	For TX and FX ports, there is an additional option
	for Enable with Aggressive Backoff. This option
	limits the size of the bursts.
	Flow Control is recommended for use primarily on
	end-station connections. Using flow control on
	trunk ports can cause unnecessary congestion on
	the network.
Auto	Allows you to set the port to auto-negotiate a speed
Negotiation	and duplex mode. Auto-negotiation works best
Mode	when the connection on the other end of the link is
	set to auto-negotiate as well. If you set a port to
	auto-negotiate, and the connection is not
	successful, set the port speed and duplex mode
	manually.
Auto	Determines what information the port advertises
Negotiation	when it starts auto-negotiating. In most cases,
Speed/Duplex	10/100 and Half/Full are the best settings, but
Advertisement	there may be cases when you want to auto-
	negotiate one parameter, while keeping the other
	fixed.

2-26 Cajun P550/P880 Manager User Guide