Xerox FaxCentre F110 Service Manual page 156

General Procedures / Information
Clip impedance
The clip impedance is presented on the line on request by the signal LIU_CLIP. It is composed of
one DC impedance of 100kOhms and one AC impedance connected between a and b.
A and b after
diode bridge
During On-Hook configuration some Calling Line information may be received by using CLID han-
dling. To enhance the reception of this CLID information the line characteristic has to be adapted
by activating a specific CLID control signal (LIU_CLIP).
Line sensing
Incoming Ring (On-Hook)
To signal the Terminal Equipment, whether an incoming call is pending, a ring signal is generated
at the line by the network.
The ring signal is specified by its amplitude, its frequency and the cadence (On- and Off-time re-
lationship). The ring signal transmission is terminated when a valid loop current is detected by the
network. The ring amplitude is added to the line On-Hook voltage.
6-70
C8xx
C802
R807
LA, LB
[V]
max. On-Hook
min. Off-Hook
Z803
R804
R806
Figure 1
Ring Phase
Ring On-time
Figure 2
12/04
Q808
LIU_CLIP
Ring Off-time
FaxCentre F110