2N Omega 48 - Installation Manual v1.0 - Manual (Page 42)

2N
®
- OMEGA 48
Installation manual
Installation manual
42
www.2n.cz
all other lines!), and the principle applies that earthing should be as good as
possible. The ideal solution is thus a yellow-green copper wire with a cross section
of at least 4 mm
2
, leading for example from an earthing strip in the main switchbox.
In an emergency it is necessary to at least earth it using such a wire (i.e., not
disconnectable) from the nearest power socket (and check that it is correctly
connected). Attach the wire to the chassis on the earth clamp on the right side of the
chassis (marked with the earth symbol) and tighten well. We recommend that the
earth always be connected before other cabling!!!
8.2. Connection to mains network
The detachable EURO-lead serves for connection to a regular socket. This
makes it possible, if necessary, to rather elegantly make the lead longer with an
extension EURO lead (used, for example, for connecting a PC and monitor). This
extension also fits into the installation strip, for example 4x4 cm with other cables.
The power lead can be run from the PBX through the hole in the power platelet with
a hole and leads to the socket freely or through the strip.
8.3. Cabling for connecting system telephones
Every system telephone is connected to the PBX by a four-wire cable. The wires
are marked A, B (call) and C, D (power + data both ways). For a system telephone to
work, it is necessary not to swap the individual wires! If correct telephone cable is
used (four-wire cross cable), this condition is met.
( you can tell if a cable is crossed by putting both transparent terminals next to each other
pointing in the same direction, the coloured wire in both terminals are in the opposite order )
If this connection does not work, the connectors probably do not have identical
connection of terminals.
8.4. Cabling for connecting ISDN
According to the standard, the subscriber termination of line ISDN (NT1, NTBA
(Network Termination Basic Access) is fitted with a connector RJ-45 with eight
contacts. The module ISDN in the PBX is also equipped with the connector RJ-45,
which can be used if the distance is not greater than
3 m . In this case it is necessary
to use four-wire non-crossed cable with terminals RJ-45.
( you can tell if a cable is not crossed by putting both transparent terminals next to each
other pointing in the same direction, the coloured wire in both terminals are in the same
order
)
If this connection does not work, the connectors probably do not have identical
connection of terminals.