Specifications
Installation IMI 66-064 ’
TYPICAL EARTH GROUND
(METAL COLD WATER PIPE,
BUILDING FRAME,..ETC.l
Figure 3-2. AC Power Connection and System Grounding
LINE CONNECTIONS
The common equipment cabinet line terminations are
standard modular plug/jack connections. Each
modular jack (2-6) provides termination for two lines.
Modular jacks 2 and 3 also provide termination for an
auxiliary pair in addition to the two outside lines. CO
line terminations can be at a type 66M-xx connector
block or at individual 6-position modular jacks. Table
3-I shows the line connection details.
The line cord that is routed between the CO line
termination and the common equipment cabinet
termination should be twisted-pair wiring.
To help insure that external overvoltage
surges do not damage the system, verify
that gas discharge tubes or similar
protection devices are installed, and
properly grounded, on all connected
outside lines.
STATION CONNECTIONS
l
Connections between the common equipment and
the stations for models NO61 6, N0820, and N1024
are via two type 66M-xx connector blocks which are
cable connected to the common equipment 50-pin
male connectors. Table 3-2a shows the station
connection detais. Station connections for the
model NO308 are via standard modular plug/jack
connections provided on the side of the common
equipment cabinet. These jacks are labeled by
station number. Table 3-2b details these
connections.
l
The maximum distance allowed from the common
equipment to the station when using #24 gauge,
twisted-pair cable is 1500 feet.
NOTE:
If spare conductors exist in the cables that are
run between the common equipment 66M-xx
connector blocks and the station jacks, it is a
good practice to connect them to earth ground.
Doing this may help prevent them from
inducing radio frequency and/or AC
interference into the system.
The polarity between the individual wires
In a particular voice or data pair is not
critical; however, do not connect the voice
circuits to the data circuits.
STATION PAIRING
Station ports are paired for both data and overload
protection as follows:
1 O--l 1 14--15 18--19 22--23 26--27 30--31
12--13 16--l 7 20--21 24--25 28--29
3-4