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 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  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;  72 FR 35199 ,
   June 27, 2007]

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