C l e a r l y b e t t e r s o u n d
Required Skill Level:
Low.
Ability to strip wire neatly, crimp RJ45 connectors,
and use of crimp ferrules.
Tools required:
RJ45 crimp tool, small wire cutters, wire stripper,
small screwdriver, ferrule crimp tool. A drill will also
be required if an enclosure is being used.
Procedure - wiring:
The procedure essentially consists of “breaking-out”
three cores of Cat 5 cable and wiring them to one
of the Z4/8
MK4
’s four balanced line inputs. A terminal
block housed in a plastic enclosure is used to make a
neat and mechanically robust set of connections.
Follow the wiring instructions in the LM-2 Installation
Guide, and install screened Cat 5 cable between the
host unit and the LM-2. Crimp a shielded RJ45 onto
each end of the cable according to the normal wiring
standard, which is included here for completeness:
At the LM-2 end, plug the RJ45 into the LM-2’s
OUTPUT connector.
Turn the host unit off, plug the RJ45 into the Facility
Port for the Zone in use, then cut the Cat 5 cable
approximately 15 cm (6”) back from the connector.
Strip the jacket back on both ends by about 5 cm
(2”), fit H15 sleeves, and fan the cores out, including
the drain wire for the cable screen.
If the terminal block is to be housed in a plastic
container (recommended for neatness), pass
the cables through holes in the enclosure, fitting
grommets in the holes first. (The holes may need to
be drilled.)
FROM LM-2 IN
REMOTE LOCATION
TO FACILITY PORT
ON HOST UNIT
Screened Cat 5 cable
Plastic enclosure with
grommetted entry holes
As Cat 5 cores are invariably solid wires, it is strongly
recommended that crimp ferrules are fitted to all
cores to make a mechanically robust connection.
White ferrules should be satisfactory for all the
connections.
Connect the cores into the terminal block as shown:
WT/OR
OR
WT/GN
GN
BL
WT/BL
WT/BN
BN
SCN
WT/OR
OR
WT/GN
GN
BL
WT/BL
WT/BN
BN
SCN
hot (‘+’)
cold (‘-’)
Cat 5 to Facility Port
Cat 5 from LM-2
1
3
2
Z4/Z8 Balanced Line Input
hot (‘+’)
cold (‘-’)
Note: Do not connect RJ45
Pins 1, 2 or 3 (Wt/Gn, Or & Wt/Or)
Twin-and-Screen
Audio Cable
9-way Terminal Block
Note that the White+Green core (RJ45 pin 3) should
not be connected in this particular application. This
core carries the VCA priority control voltage from
PIN
USE
CAT 5 CORE
1
Audio ‘cold’ phase (-)
White + Orange
2
Audio ‘hot’ phase (+)
Orange
3
Priority VCA control
White + Green
4
+V
Blue
5
0 V
White + Blue
6
-V
Green
7
Music level control (0 to 10 V)
White + Brown
8
Music source select control (0 to 10 V)
Brown
SCN
GND for system music controls
Connector shell
1
8
1
8
1
8
