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130
Other Consideratiaons
130.1 Electrical Noise Generators
Certain
equipment, such as welding machines,
thyrister-driven power supplies, large electrical motors, etc.
generate electrical noise. As a stored program machine the
Electra-616 System is vulnerable to this noise. When this
type of machine is present at an instahation, the following
precautionary steps are urged:
1.
Locate KSU, telephone sets, and cabling away from
these machines.
2. If cables must pass near these machines, use shielded
cabIe with the shield grounded.
3. Ensure all machines of this type are well-grounded to a
separate ground to minimize noise interference.
130.2
Pre-installation Site Survey
Since a pre-installation survey is generally required
to plan for application and installation, a check of the
matters covered so far in this section at this time will pre-
vent later problems.
130.3 Additional Equipment
In addition to electronic station equipment and
the KSU and their contents, other equipment is required.
This includes cables, modular connecting jacks, quick-
connect blocks (or smimlar apparatus), etc. This additional
equipment must be locally supplied.
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140 Specifications
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140.1 System Capacity
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The Electra-616 system capacity is as follows:
x
CO/PBX Lines
6max.
Intercom Paths
2 max.
Internal and External Paging
Path
1 max.
Station Sets
16 max.
BLF Consoles
2 max.
.k.
Door Phones 2 max.
7,
140.2 Cabling Requirements
1.
Cabling required for Key Telephone Sets, BLF Con-
soles, Door Phones is as follows:
1) Required Cable
-
Key Telephone Set: Twisted 2-pair cable
-
BLF Console:
Twisted 1 -pair cable
-
Door Phone:
Twisted
1
-pair cable
2) Maximum Loop Resistance and Cable Length at
24AWG
-
Key Telephone Set: 40 ohms, 700 ft. (21Om)
-
BLF Console:
40 ohms, 700 ft. (21Om)
-
Door Phone:
40 ohms, 700 ft. (210m)
3) Maximum Cable Length at 22AWG
*
Key Telephone Set: 1,150 ft. (35Om)
-
BLF Console:
1,150 ft. (35Om)
-
Door Phone:
1,150 ft. (35Om)
2. BLF Consoles require a local power supply (provided
with each unit), which plugs into a 117V AC outlet.
The cable provided with these units is 6 feet in length.
Page 100-2