Emulex 375 manual Diagnostics, Setting Description Port Control, Bypass on Clock Delta

EMULEX MODEL 375 SAN STORAGE SWITCH	CHAPTER 3: SWITCH MANAGEMENT
USER’S GUIDE

Diagnostics

The following settings are available.

Setting	Description
Port Control	The method for controlling a port. Options include:
	• auto – the default setting. The switch will automatically insert a
	port based on policy settings. This prevents the insertion of
	incompatible ports, which may cause disruption.
	• bypass – removes a port from the network. Use this mode to
	keep a device out of an initialization cycle when
	troubleshooting.
	• extLoopback – removes a port from the network and routes the
	port's receive signal back through the port's transmitter. Use
	this mode to isolate a specific zone for troubleshooting or to
	test a transceiver’s circuitry and attached media from the node
	end.
	• insert – allows ports whose transceivers cannot derive a valid
	clock or "K" character (Ordered Set) to join a zone. Use this
	mode cautiously – devices without valid characters may put
	bad data into a zone, causing the zone to go down.
Bypass on Clock Delta	The switch determines the relative frequency of the signal being
	received by a port to the internal switch clock. The result of this
	test allows the determination of how far apart in frequency the
	switch’s clock is in relation to the clock of the received signal –
	the clock delta. If the clock delta exceeds a set threshold, the
	switch is notified and the port may be bypassed if necessary.
	Typically, clock drift is slow enough to allow the removal and
	replacement of a defective part before the defective part begins
	to affect system performance.

EMULEX CORPORATION 36

PART NUMBER 00041392-002 REV. B