Xerox FaxCentre F110 Service Manual page 166

General Procedures / Information
Parallel Terminal Equipment Off-Hook(FCU On-Hook)
The loop current change due to an parallel off-hook condition has only little effect for the idle loop
current (On-Hook state).
LA, LB
max. On-Hook
min.Off-Hook)
Loop Current
min. Loop Current
threshold
Idle Loop Current
Incoming Ring (On-Hook)
The line voltage change due to an incoming ring has no effect on the loop current detection if
LIU_HOOK=0 and may have an effect if LIU_HOOK=1. See also EXTLOOP signalling.
CLI Polarity Reversal Detection (On-Hook)
The line voltage changes the polarity as well as the idle loop current, but has no effect if
LIU_HOOK=0 and may have an effect if LIU_HOOK=1.
Pulse-Dial
The signalling during Pulse-Dial has been described in detail with PD Pulse-Dial. The current
changes during Pulse-Dial are mirrored by INTLOOP.
6-80
On-Hook On -> Off-Hook
[V]
On -> Off-Hook transition time
On-Hook
[mA]
No Loop Current
Off-Hook
Parallel Parallel On ->
On-Hook Off-Hook
Off-Hook
Valid Loop Current
Figure 3
12/04
Parallel Off-Hook
FaxCentre F110