Specifications
11.
SYSTEM
INTERCONNECTION
A.
INPUTS
&
OUTPUTS:
WHAT
CABLE
TO
USE
Intercom
Output
to
the
System
Each intercom
channel
is
output
from
the
CS-210
on
standard
two-conduc-
tor
mic
cable.
The
cable
is
routed from
the
3-pin
male
XLR
connectors
on the
CS-210
rear
panel
to
the
3-pin
female
XLR
input
connectors
on
the
Remote
Stations.
One
cable
wire
carries
DC
power
and
the other
wire
carries
the
intercom
signal;
the
shield
acts
as
circuit
ground.
The
pin
assignments
on
ALL
3-pin
XLR
intercom
connectors
(male
and
female)
are:
PIN
1--
COMMON
PIN 2--
+
VDC
PIN
3--
INTERCOM
AUDIO
(Channel
A
or
B)
Choosing
Cable
The
CS-210
provides three output
connectors
for
each
channel,
so
each
channel
can
be routed
separately
(in
individual
mic
cables)
or
combined
from
one
Channel
A
output
and
one
Channel
B
output
onto
multi-pair
cable.
The
latter
is
most
convenient
when
connecting
to
the
input
terminal strips
of
Clear-Com's
wall-
or
custom-mount
two-channel
sta-
tions
(such as
KB-IIIA
or
MR-102A).
These methods,
of
course,
can
be
combined
in
the
same
system.
When
choosing
interconnecting
cable,
keep
the
fol
lowing
considerations
in
mind:
1)
DC
resistance
affects
crosstalk.
In
permanent
installa-
tions,
do
not
use
wire
smaller
than
20
gauge,
stranded
(except
runs shorter
than
100
feet).
Keep
the
total
resis-
tance
under
100
ohms.
2)
The
capacitance
of
the
interconnecting
cable affects
the
frequency
response
and
sidetone
stability.
Total
capaci-
tance
should
not
be
greater than
.25
microfarads
(capa-
citance
between conductor
and
shield;
equivalent
to
an
intercom
network
containing
5000
feet
of
50 pF
per
foot
of
cable).
3)
Clear-Com
Systems operate
with
cable
that
has
no
more
than
50 pF
from
conductor
to
conductor,
and
no
more
than
70
pF
from
conductor
to shield.
PORTABLE
INSTALLATION
CABLE
Typical
cable
for
connecting
the
CS-210
to
the
Remote
Stations
is
rubber-jacketed,
two-conductor,
shielded
microphone
cable.
We
suggest
you
try:
BELDEN
8413
(24
gauge,
stranded)
for
intercom
lines
up
to
500
feet
in
length,
and
BELDEN
8412
(20
gauge,
stranded)
for
lines
up
to
5000
feet.*
(continued)
5