2N LiftNet, User Manual

Page: 23 / 99

PSTN Central Unit 2.1
23
Bus Connection
Requirements

With multi-wire cables, always use a symmetrical twisted pair of conductors
(i.e. those that match each other). Standard UTP cables contain twisted pairs.

With special cabling (in the cabin), use the adjoining cables and make sure
that the nearest neighbouring conductors do not radiate interference (power
cables, video signals, etc.).
Recommendations

Do not lead the bus close to power cables, especially in long-distance
sections.

Branch the bus to shorten the total length of sections.
Safety

The bus is electrically isolated from the telephone line circuits according to
the EN60950 standard requirements and its low voltage cannot cause any
electrical accident.
CU Connection to Telephone Line
LN works in a wide range regardless of polarity and line parameters (refer to Technical
parameters). Connect it using the attached cable with an RJ-12 terminal.
Caution

One CU may be connected to one telephone line only and no other
telephone terminal equipment may be connected to this line.

2N
®
LiftNet requires the telephone line exclusively for itself. This means
that NOT even a system through which the telephone line goes (priority
connection, ESS, e.g.) may be connected to this telephone line.

No double or group serial lines may be used.

No telephone “multiplugs”, even the “intelligent” ones, may be used.

Never connect LN to an ISDN line.
CU telephone network connection options
There are four connection options:

PSTN line

PBX line

GSM gateway

VoIP adapter