ATT System 25 Reference Manual

TECHNICAL SPECIFICATIONS
Analog Transmission Characteristics (Contd)
Quantization Distortion:
SIGNAL LEVELDISTORTION LEVEL
+2 to -30 dBm0
35 dB
-40 dBm029 dB
-45 dBm025 dB
Sampling Rate:8 kHz
Terminating Impedance:600 ohms
Trunk Balance Impedance:600 ohms or Complex Z (selectable)
Echo Return Loss:
The echo return loss of the switching equipment is infinite. The echo return loss of the
station equipment can be engineered for greater than 18 dB over the range of 500 Hz to
2500 Hz.
Loop Resistance:
l...

TECHNICAL SPECIFICATIONS
Analog Transmission Characteristics (Contd)
Single Frequency Return Loss (Talking State):
Station to station—exceeds 12 dB
Station to 4-wire trunk connection—exceeds 14 dB
Station to 2-wire trunk connection—exceeds 12 dB
Peak Noise Level:
Analog to analog—20 dBrnc
Analog to digital—19 dBrnc
Digital to analog—13 dBrnc
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ENVIRONMENTAL REQUIREMENTS
Floor Plans And Layouts
Table Top Space
Wall Space Requirements
Temperature and Humidity
Air Purity
Lighting
Electrical Noise/Radio-Frequency Interference (RFI)
Environmental Considerations for ATL Cordless Telephone Set
AC Power Requirements
Grounding
Lightning Protection6-1
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6-5
6-5
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6-8
6-10
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Figures
Figure 6-1.Typical System 25 Equipment Area Floor Plan                       6-2
Figure 6-2.Typical System 25 Equipment Area Elevation Plan                        6-3
Figure 6-3.AC Power Distribution - Multiple Cabinet System              6-9
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ENVIRONMENTAL REQUIREMENTS
ENVIRONMENTAL REQUIREMENTS
This section provides information on floor and wall space requirements for System 25
cabinets and associated peripheral equipment.Also included are specifications for
temperature,humidity, air purity, lighting,
electrical noise (RFI) suppression, power,
grounding, and lightning protection.
Floor Plans And Layouts
Floor plan arrangements will vary depending on the available equipment area and anticipated
system growth. A typical floor plan is shown in...

ENVIRONMENTAL REQUIREMENTS
SYSTEMCABINETS(FOOTPRINT)
FRONTNOTE 3BACKBOARD
TERMINATION
FIELD
(NOTE 4)
TABLE
NOTES:
1. 115V AC, 60 Hz, 15 AMP OUTLETS
(HUBBELL 5262 OR EQUIVALENT)
MUST BE LOCATED WITHIN SIX FEET
(1.8m) OF SYSTEM CABINETS.
2. MULTIPLE CABINET SYSTEMS REQUIRE
TWO QUAD OUTLETS, SINGLE CABINET
SYSTEMS REQUIRE ONE QUAD OUTLET.
3. ALLOW AT LEAST 24 INCHES OF SPACE
IN FRONT OF CABINETS. TABLE MUST
BE ABLE TO SUPPORT 250 POUNDS.
4. BACKBOARD IS 3/4 INCHES THICK BY
48 INCHES WIDE BY 72 INCHES LONG...

ENVIRONMENTAL REQUIREMENTS
Figure 6-2.
Typical System 25 Equipment Area Elevation Plan
6-3 

ENVIRONMENTAL REQUIREMENTS
Table Top Space
The following system equipment requires (customer provided) table top space in the
equipment area:
l System Cabinets:Each cabinet is 13 inches high, 17 inches wide, and 21 inches
deep. A 3-cabinet system requires a vertical space of approximately 40 inches and a
17-inch by 21-inch table top space.Each cabinet weighs approximately 75 pounds.
Place the cabinets on a desk or table top that is about 18 inches high and capable of
supporting at least 250 pounds. The...

ENVIRONMENTAL REQUIREMENTS
Air Purity
The cabinet should not be installed in an area where the air may be contaminated with any of
the following:
l Excessive dust,lint, carbon particles,
paper fiber contaminants, or metallic
contaminants
l Contaminants expelled by office copying machines
l Highly corrosive atmosphere within an enclosed area or atmosphere containing
vaporized chemical compounds that may condense on the equipment
l Explosive or flammable atmosphere.
Lighting
Lighting should be adequate to...

ENVIRONMENTAL REQUIREMENTS
Environmental Considerations for ATL Cordless Telephone Set
The ATL Cordless telephone set uses standard radio transmission technology to pass
communications between the handset and the base. This radio transmission is susceptible
to Radio Frequency Interference as explained on the previous page.
The ATL Cordless Telephone performs best when it is operated in an area free of the
following devices and materials:
l Metals (including steel, aluminum, etc. )
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—metal...