FCC 90.483 Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 90.483 Permissible methods and requirements of interconnecting private and
public systems of communications.
Interconnection may be accomplished by commercial mobile service providers
licensed under this part by any technically feasible means. Interconnection
may be accomplished by private mobile service providers either manually or
automatically under the supervision and control of a transmitter control
operator at a fixed position in the authorized system of communications or
it may be accomplished under the supervision and control of mobile
operators, and is subject to the following provisions:
(a) Where a system is interconnected manually at a fixed control point, the
control point operator must maintain the capability to turn the carrier of
the transmitter off or to de-activate the system completely when
circumstances warrant such action.
(b) When the system is interconnected automatically it may be supervised at
the control point or in mobile units.
(1) For control point supervision, the following is required:
(i) The control point operator must maintain the capability to turn the
carrier of the transmitter off or to de-activate the system completely when
circumstances warrant such action.
(ii) When a frequency is shared by more than one system, automatic
monitoring equipment must be installed at the base station to prevent
activation of the transmitter when signals of co-channel stations are
present and activation would interfere with communications in progress.
Licensees may operate without the monitoring equipment if they have obtained
the consent of all co-channel licensees located within a 120 km (75 mile)
radius of the interconnected base station transmitter. A statement must be
submitted to the Commission indicating that all co-channel licensees have
consented to operate without the monitoring equipment. If a licensee has
agreed that the use of monitoring equipment is not necessary, but later
decides that the monitoring equipment is necessary, the licensee may request
that the co-channel licensees reconsider the use of monitoring equipment. If
the licensee cannot reach an agreement with co-channel licensees, the
licensee may request that the Commission consider the matter and assign it
to another channel. If a new licensee is assigned to a frequency where all
the co-channel licensees have agreed that the use of monitoring equipment is
not necessary, and the new licensee does not agree, the new licensee may
request the co-channel licensees to reconsider the use of monitoring
equipment. If the new licensee cannot reach an agreement with co-channel
licensees, it should request a new channel from the Commission. Systems on
frequencies above 800 MHz are exempt from this requirement.
(2) For mobile unit supervision, the following is required:
(i) When a frequency is shared by more than one system, automatic monitoring
equipment must be installed at each base station to prevent its activation
when signals of other co-channel stations are present and activation would
interfere with communications in progress. Licensees may operate without
this equipment if they have obtained the consent of all co-channel licensees
located within a 120 km (75 mile) radius of the interconnected base station
transmitter. A statement must be submitted to the Commission indicating that
all co-channel licensees have consented to operate without the monitoring
equipment. If a licensee has agreed that the use of monitoring equipment is
not necessary, but later decides that the monitoring equipment is necessary,
the licensee may request that the co-channel licensees reconsider the use of
monitoring equipment. If the licensee cannot reach an agreement with
co-channel licensees, the licensee may request that the Commission consider
the matter and assign it to another channel. If a new licensee is assigned
to a frequency where all the co-channel licensees have agreed that the use
of monitoring equipment is not necessary, and the new licensee does not
agree, the new licensee may request the co-channel licensees to reconsider
the use of monitoring equipment. If the new licensee cannot reach an
agreement with co-channel licensees, it should request a new channel from
the Commission. Systems above 800 MHz are exempt from this requirement.
(ii) Initial access from points within the public switched telephone network
must be limited to transmission of a 3-second tone, after which time the
transmitter shall close down. No additional signals may be transmitted until
acknowledgement from a mobile station of the licensee is received. Licensees
are exempt from this requirement if they have obtained the consent of all
co-channel licensees located within a 120 km (75 mile) radius of the
interconnected base station transmitter. However, licensees may choose to
set their own time limitations. A statement must be submitted to the
Commission indicating that all co-channel licensees have consented to
operate without the monitoring equipment. If a licensee has agreed that the
use of monitoring equipment is not necessary, but later decides that the
monitoring equipment is necessary, the licensee may request that the
co-channel licensees reconsider the use of monitoring equipment. If the
licensee cannot reach an agreement with co-channel licensees, the licensee
may request that the Commission consider the matter and assign it to another
channel. If a new licensee is assigned to a frequency where all the
co-channel licensees have agreed that the use of monitoring equipment is not
necessary, and the new licensee does not agree, the new licensee may request
the co-channel licensees to reconsider the use of monitoring equipment. If
the new licensee cannot reach an agreement with co-channel licensees, it
should request a new channel from the Commission. Systems above 800 MHz are
exempt from this requirement.
(c) In single frequency systems, equipment must be installed at the base
station which will limit any single transmission from within the public
switched telephone network to 30 seconds duration and which in turn will
activate the base station receiver to monitor the frequency for a period of
not less than three (3) seconds. The mobile station must be capable of
terminating the communications during the three (3) seconds. Licensees are
exempt from this requirement if they have obtained the consent of all
co-channel licensees located within a 120 km (75 mile) radius of the
interconnected base station transmitter. However, licensees may choose to
set their own time limitations. A statement must be submitted to the
Commission indicating that all co-channel licensees have consented to
operate without the monitoring equipment. If a licensee has agreed that the
use of monitoring equipment is not necessary, but later decides that the
monitoring equipment is necessary, the licensee may request that the
co-channel licensees reconsider the use of monitoring equipment. If the
licensee cannot reach an agreement with co-channel licensees, the licensee
may request that the Commission consider the matter and assign it another
channel. If a new licensee is assigned to a frequency where all the
co-channel licensees have agreed that the use of monitoring equipment. If
the new licensee cannot reach an agreement with co-channel licensees, it
should request a new channel from the Commission.
(d) A timer must be installed at the base station transmitter which limits
communications to three (3) minutes. After three (3) minutes, the system
must close down, with all circuits between the base station and the public
switch telephone network disconnected. This provision does not apply to
systems which establish eligibility pursuant to Sec. Sec. 90.20(a)(1)(i),
90.20(a)(1)(ii), and 90.20(a)(2), except Sec. Sec. 90.20(a)(2)(i) and
90.20(a)(2)(ii), or who are Power, Petroleum, or Railroad licensees (as
defined in Sec. 90.7), or to systems above 800 MHz. All systems must be equipped
with a timer that closes down the transmitter within three minutes of the
last transmission. Licensees may operate without these requirements if they
have obtained the consent of all co-channel licensees located within a 120
km (75 mile) radius of the interconnected base station transmitter. However,
licensees may choose to set their own time limitations. A statement must be
submitted to the Commission indicating that all co-channel licensees have
consented to operate without the monitoring equipment. If a licensee has
agreed that the use of monitoring equipment is not necessary, but later
decides that the monitoring equipment is necessary, the licensee may request
that the co-channel licensees reconsider the use of monitoring equipment. If
the licensee cannot reach an agreement with co-channel licensees, the
licensee may request that the Commission consider the matter and assign it
to another channel. If a new licensee is assigned to a frequency where all
the co-channel licensees have agreed that the use of monitoring equipment is
not necessary, and the new licensee does not agree, the new licensee may
request the co-channel licensees to reconsider the use of monitoring
equipment. If the new licensee cannot reach an agreement with co-channel
licensees, it should request a new channel from the Commission.
[ 47 FR 17520 , Apr. 23, 1982, as amended at 48 FR 29518 , June 27, 1983; 50 FR 15153 , Apr. 17, 1985; 58 FR 44961 , Aug. 25, 1993; 59 FR 59966 , Nov. 21,
1994; 61 FR 6576 , Feb. 21, 1996; 62 FR 18934 , Apr. 17, 1997]
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