2N Lift emergency phone 2N LiftNet - Manual, 1446 v1.8.3 - Manual (Page 25)

PSTN Central Unit 2.1
25
GSM Gateway Connection (Temporary
– Substitutes the GSM CU
Version, Part No. 501303E)
Used wherever no fixed telephone line is available.
Requirements
 The GSM gateway has to be functional even in the case of power outage.
 The GSM gateway has to recover its function without requiring the PIN.
Other requirements
 Find a suitable place or use a special (directional) antenna where the GSM
signal quality is poor.
 Secure the GSM gateway SIM card against misappropriation.
 With a pre-paid SIM card, monitor the credit use and on-time replenishing.
VoIP Adapter Connection
This is the cheapest solution where a reliable Internet connection is available.
Requirements
 The entire system has to be functional even in the case of power outage.
Other recommendations
 As the VoIP technology is rather complicated, make sure that the dispatching
office personnel monitor connectivity reliably (evaluate the checking calls).
Tip
 Some VoIP adapters have two independent telephone lines. A majority of
subscribers use just one line and the other line is thus available “free of
charge”.
Operation without Telephone Line
LN can be used as an intercom during lift assembly work even without a telephone
line. In that case, make sure that the lift blocking function is not activated until the
telephone line has been connected.
USB Port Connection
Recommendations
Do not leave a PC connected for a long time unless necessary in order to minimise risk
of PC damage due to HV shock from the telephone line during storms, e.g.