Goto Section: 90.671 | 90.673 | Table of Contents
FCC 90.672
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 90.672 Unacceptable interference to non-cellular 800 MHz licensees from
800 MHz cellular systems or part 22 Cellular Radiotelephone systems, and
within the 900 MHz Business/Industrial Land Transportation Pool.
(a) Definition. Except as provided in 47 CFR 90.617(k), unacceptable
interference to non-cellular licensees in the 800 MHz band from 800 MHz
cellular systems or part 22 of this chapter, Cellular Radiotelephone
systems and within the 900 MHz Business/Industrial Land Transportation
(B/ILT) Pool will be deemed to occur when the below conditions are met:
(1) A transceiver at a site at which interference is encountered:
(i) Is in good repair and operating condition, and is receiving:
(A) A median desired signal strength of -104 dBm or higher if operating
in the 800 MHz band, or a median desired signal strength of -88 dBm if
operating in the 900 MHz B/ILT Pool, as measured at the R.F. input of
the receiver of a mobile unit; or
(B) A median desired signal strength of -101 dBm or higher if operating
in the 800 MHz band, or a median desired signal strength of -85 dBm if
operating in the 900 MHz B/ILT Pool, as measured at the R.F. input of
the receiver of a portable i.e. , hand-held unit; and either
(ii) Is a voice transceiver:
(A) With manufacturer published performance specifications for the
receiver section of the transceiver equal to, or exceeding, the minimum
standards set out in paragraph (b) of this section, and;
(B) Receiving an undesired signal or signals which cause the measured
Carrier to Noise plus Interference (C/(I+N)) ratio of the receiver
section of said transceiver to be less than 20 dB if operating in the
800 MHz band, or less than 17 dB if operating in the 900 MHz B/ILT
Pool, or;
(iii) Is a non-voice transceiver receiving an undesired signal or
signals which cause the measured bit error rate (BER) (or some
comparable specification) of the receiver section of said transceiver
to be more than the value reasonably designated by the manufacturer.
(2) Provided, however, that if the receiver section of the mobile or
portable voice transceiver does not conform to the standards set out in
paragraph (b) of this section, then that transceiver shall be deemed
subject to unacceptable interference only at sites where the median
desired signal satisfies the applicable threshold measured signal power
in paragraphs (a)(1)(i) of this section after an upward adjustment to
account for the difference in receiver section performance. The upward
adjustment shall be equal to the increase in the desired signal
required to restore the receiver section of the subject transceiver to
the 20 dB C/(I+N) ratio of paragraph (a)(1)(ii)(B) of this section. The
adjusted threshold levels shall then define the minimum measured signal
power(s) in lieu of paragraphs (a)(1)(i) of this section at which the
licensee using such non-compliant transceiver is entitled to
interference protection.
(b) Minimum Receiver Requirements. Voice transceivers capable of
operating in the 806-824 MHz portion of the 800 MHz band, or in the 900
MHz Business/Industrial Land Transportation Pool, shall have the
following minimum performance specifications in order for the system in
which such transceivers are used to claim entitlement to full
protection against unacceptable interference. (See paragraph (a)(2) of
this section.)
(1) Voice units intended for mobile use: 75 dB intermodulation
rejection ratio; 75 dB adjacent channel rejection ratio; -116 dBm
reference sensitivity.
(2) Voice units intended for portable use: 70 dB intermodulation
rejection ratio; 70 dB adjacent channel rejection ratio; -116 dBm
reference sensitivity.
(3) Voice units intended for mobile or portable use in the 900 MHz
Business/Industrial Land Transportation Pool: 60 dB intermodulation
rejection ratio; 60 dB adjacent channel rejection ratio; -116 dBm
reference sensitivity.
[ 73 FR 67800 , Nov. 17, 2008]
Goto Section: 90.671 | 90.673
Goto Year: 2010 |
2012
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