Bell System Practices 1A Installation And Maintenance

BE(L SYSTEM PRACTICES
1
A SPEAKERPHON ESYSTEM
INSTALLATION AND MAINTENANCE
SECTION 512-61 0-200CA
Issue B, July, 1971
Bell Canada
Standard
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1. GENERAL
1.01
Sele~t the location for the components of
the lA speakerphone system after consult-
ing the customer. Place the components in posi-
tion before running inside wiring cable and
fastening.' This usually will result in a more
favourable installation from the customer's view-
point as well as servicewise.
1.02
This section is reissued to update inform-
ation.
2. INSTALLATION
2.01
Locate and install the control unit accord-
ing to the following requirements:
• Control unit shall be no more than 20 cable
feet from the 592-type telephone or the
656A transmitter unit.
The customer shall furnish and main-
tain a 105- to 125-volt 60-cycle ac com-
mercial power outlet located within 6
feet of the contTol unit. The power out-
let shall not be under control of a wall
switch. It need not be on a separate
circuit unless the additional
8
watts of
power consumed by the contTol unit
causes the operation of the fuse device
in the commercial power fuse box.
• The control unit should always be mounted
on a backboard of suitable size (9-5/8 by
7-1/8 inches), e.g., 165A backboard when
installed on a metal surface to prevent con-
trol unit from becoming grounded.
• A separate cable must be run between the
control unit and the other components.
Never include other circuits in this cable.
This prevents crosstalk interference.
Under no circumstance connect the
power cord of the control unit until all
physical wOl'k is complete. If there is
reason to work on the control unit again
during the testing of the system, dis-
connect the power cord of the control
unit from the power outlet.
2.02
Connect the components of the A1 speaker-
phone system by using the following
equipment:
• 44A connecting blocks
• A 12-pair inside wiring cable
• Telephone set cords
• Terminal strip of the control unit
2.03
Conceal connecting blocks if possible.
Install in knee wells or onback of desk. Use
168-type backboard for connecting blocks. This
will help group them to fit under the 101-type
cover.
2.04
When locating and installing the telephone
set used with the lA ~peakerphone system,
consider the following faCtors:
• Cord should not be exposed to moisture.
• Excess cord should be kept off the floor by
coiling slack and fastening with cable
clamp to wall or desk.
2.05
It is recommended that the 656A trans-
mitter (Fig. 2) be installed as follows:
• Install near the telephone set.
• Connect directly to the terminal strip of
the control unit if possible.
©
Bell Canada, 1971
Printed in Canada
Page 1