§  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
   kilometer (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 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 this equipment if they have obtained the
   consent of all co-channel licensees located within a 120 kilometer (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.

   (ii) Initial access 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
   kilometer (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 on frequencies 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
   § § 90.20(a)(1)(i), 90.20(a)(1)(ii), and 90.20(a)(2), except
   § § 90.20(a)(2)(i) and 90.20(a)(2)(ii), or who are Power, Petroleum, or
   Railroad licensees (as defined in § 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;
    72 FR 35199 , June 27, 2007]

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