Siemens X-400 Ing, Digital input, Dispersion, Display Mode, DMode, Fault mask, FO port, Latency

Glossary

Connection monitor- With regular link test pulses, SCALANCE X-400 monitors the con-

ing	nected TP and FO cable segments for short-circuits or interruptions.
	The SCALANCE does not send data to a segment from which it is not
	receiving link test pulses.
Digital input	A digital input is used to acquire binary file information. A state change
	can be logged in the Log Table or reported by E-mail or traps. The
	voltage levels between – 30 V and + 3 V correspond to logical state "0“,
	voltage levels between + 13 V and + 30 V correspond to logical state
	"1“.
Dispersion	Broadening and distortion of light pulses in fiber-optic cable due to
	signals arriving at different times. On multimode FOC, the distortion of
	the output signal is greater than with single mode FOC.
Display Mode	Display mode that indicates various statuses (port status, power moni-
(DMode)	toring activated etc.). The modes can be switched over using a button
	on the Switch CPU.
ESM	Electrical Switching Module – SIMATIC NET Ethernet switch with elec-
	trical ports.
Fault mask	Specifies the desired status (good status). Deviations from this occur-
	ring during operation are handled as faults.
FO port	Fiber-Optic Port
Full duplex	Two-way simultaneous - both communication partners can send and
	receive at the same time.
Half duplex	Two-way alternate transmission mode- it is only possible to either send
	or receive over the interfaces at any one time.
Latency	Latency specifies the time taken by frames to pass through a switch.
	This does not include the time required for buffering frames.
Load Containment	With its filtering functions, a switch makes sure that local data traffic
	remains local. The local network load of a segment is contained in the
	originating segment and does not represent extra load on the remain-
	der of the network.

140	Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
	C79000-G8976-C186-03