General Procedures / Information
FaxCentre F110 12/04 6-75
Signal flow
Line handling
The Line Signals are used to transfer information depending on the state of the voltage and cur-
rent rating. Each signal is influenced according the current information transfer.
LA, LB,
LA1, LB2 On-Hook, Off-Hook Configuration
The activation of the hook-switch (HOOK)in the line connection, of the Line Control component,
establishes a connection between the network and the terminal equipment (LIU).
Figure 9
Due to the change of the source resistance of the terminal equipment the line voltage drops from
an idle state (On-Hook) to a connection state (Off-Hook).
Drops at the line voltage (connection) are not necessary a On- to Off-Hook transition. A rising loop
current in conjunction with a voltage drop at the line is indicating a valid connection.
Parallel Terminal Equipment Off-Hook (On-Hook)
The activation of a parallel Terminal equipment, during normal terminal equipment On-Hook
(HOOK=0), establishes a connection between the network and the parallel terminal equipment
only. Due to the source resistance change of the parallel terminal equipment the voltage drops
from an idle state (On-Hook) to a connection state (Off-Hook).
LA, LB
On -> Off-Hook transition time
On -> Off-Hook
[V]
min. Off-Hook
On-Hook Off-Hook
max. On-Hook
Off-Hook Signalling
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