Xerox F110 - FaxCentre B/W Laser Service Manual

General Procedures / Information
FaxCentre F110 12/04 6-79
Off-Hook, On-Hook Configuration
The activation of the hook-switch (HOOK = 1 and PD=1) within the line connection, establishes a
connection between the network and the terminal equipment. Due to the reduction of the source
resistance of the terminal equipment, the loop current (I
Ioop
)rises which indicates an Off-hook con-
dition. The loop current is above a certain threshold as long as the terminal is connected (by de-
tecting a valid loop current within the terminal equipment) or the network is in a valid loop current
state (see also LA, LB On-Hook, Off-Hook Configuration). Due to a hook change, the changing
line voltage may introduce an erroneous ring (RING) signal !
Figure 2
Parallel Terminal Equipment Off-Hook(FCU Off-Hook)
When a parallel terminal equipment, connected directly to the line, goes Off-Hook, it reduces the
line voltage, which results in a drop of the loop current that may be detected.
PSTN
Network
LA
LB
U
Line
I
Line
LB2 LA2
U
IntLoop
I
Ext Loop
LIU_HOOK
Terminal
Equipment
PD
1
0
1
Internal phone On Hook

Xerox F110 - FaxCentre B/W Laser Specifications

General

Brand	Xerox
Model	F110 - FaxCentre B/W Laser
Category	Printer
Language	English