Nortel Networks 10BASE-T manual Choosing a High Speed Flow Control Mode

			Using the Console Interface
Table 3-20.	High Speed Flow Control Configuration Screen Fields (continued)
Field		Description
Flow Control		Allows you to control traffic and avoid congestion on the gigabit MDA port. Two
		modes are available (see “Choosing a High Speed Flow Control Mode” on
		page 3-57 for details about the two modes). Autonegotiation must be disabled
		for this port when using this feature.
		Default	Disabled
		Range	Disabled, Symmetric, Asymmetric
		Note: The following two fields appear only when a (single MAC) MDA with a
		separate redundant Phy port is installed.
Preferred Phy
		Allows you to choose the preferred Phy port; the other Phy port reverts to
		backup.
		Default	Right
		Range	Right, Left
Active Phy		Indicates the operational Phy port.
		Default	None
		Range	None, Right, Left

Choosing a High Speed Flow Control Mode

The High Speed Flow Control feature allows you to control traffic and avoid congestion on the gigabit full-duplex link. If the receive port buffer becomes full, the gigabit MDA issues a flow-control signal to the device at the other end of the link to suspend transmission. When the receive buffer is no longer full, the MDA issues a signal to resume the transmission.

You can choose Symmetric or Asymmetric flow-control mode.

309985-C Rev 00 3-57