This Standard provides performance and compatibility requirements for
telephone sets intended for
direct tip and ring connection to central office (CO) or private
branch exchange (PBX) lines. The
requirements are based on present telecommunications plant
characteristics at the telephone set
interface. These requirements should ensure satisfactory voice-grade
service to the user in a high
percentage of installations, both initially and over a period of time.
However, owing to the wide
range of switching equipment, customer apparatus, and loop plant (es,
some subscriber carrier
systems), conformance with this Standard does not guarantee acceptable
performance or interface
compatibility under all possible operating conditions. In general,
where two levels of
acceptability are specified (desirable and mandatory), compliance with
the criteria in the
desirable category implies a higher probability of acceptable
performance or compatibility.
These requirements apply to a telephone set intended for single-party
service; however, at any one
location, one or more telephone sets may be connected to the line.
When multiple telephone sets are
connected to a line it is assumed that only one set is off-hook at a
time. If more than one
telephone set is off-hook at a time, the resulting service over the
network may not be satisfactory
in all respects. These requirements apply also to a telephone set
intended for connection to the
standard station interface on a PBX as specified in CSA Standard T512
A telephone set complies with this Standard if it meets the
requirements when manufactured and can
be expected to continue to meet these requirements when properly used
This Standard applies to equipment for general application and
selected application telephones. The
latter may not be suitable in all applications, e.g., where such a
telephone set is the sole
instrument at a particular location.
These requirements are not intended to describe specific requirements
for the following types of
telephones. However, the general transmission, signaling, and
impedance requirements are applicable
for equipment such as:
(a) telephones used with data sets;
(b) coin telephones; and
(c) emergency special purpose telephones, or other public or
semipublic telephones (eg, mine,
elevator, and public emergency telephones).
Electromagnetic Interference (EMI)
This Standard does not include EMI requirements.
This Standard does not include requirements for user safety. The
applicable Standards for user
safety of telecommunications terminal equipment can be found in the
Canadian Electrical Code, Parts
I and II, and UL Standard 1459, Standard for Telephone Equipment.
Equipment that meets the requirements of this Standard may not
necessarily comply with network
protection standards mandated by various levels of government.
This Standard is intended to be in conformity with Part 68 of the FCC
Rules and CS-03 of Industry
Canada, but it is not limited to the scope of those rules.
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