elmeg C46e Description And Installation page 55

S01:INT S02:INT S03:INT
a2 a1 b1 b2
Assignm ent for S01...S03:
Internal ISDN c onnec tion
Fig. 40: Module 4/1S
2.6.7 Fine overload protection module (FSM)
The fine overload protection module (FSM) is provided to divert overvoltage at
analog or ISDN connecting lines (with the elmeg C46e implemented only for
the external ISDN connection and the modules). Overload protection is required
for each connection that is to be protected. Any overvoltage which occurs in
the lines is diverted to the functional ground. It is imperative that you have
functional grounding installed, as shown on page 14, and that it is always
connected to provide continuous protection. The FSM module is plugged into
the slots provided for it on the motherboard and modules 1 and 2. Please do
not touch any other components on the motherboard when installing the FSM.
The FSM is of symmetrical design, so that you can choose the direction in
which it is plugged in appropriately.
Please note that the FSM module is an expendable fusible link, i.e. once a
module has been actuated it must then be replaced with a new one.
Fig. 41: Module FSM
Jum p er for sw itc hover
installed : Internal ISDN c onnec tion
op en: external ISDN c onnec tion
ISDN term inal b loc k
S04:INT/ EXT
for the internal and external ISDN c onnec tion
ISDN term inal b loc k rem oved
a2 a1 b1 b2
Assignm ent for S04: Internal ISDN c onnec tion
a1 a2 b2 b1
Assignm ent for S04: External ISDN c onnec tion
S04:INT /EXT
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