Sec.  24.237   Interference protection.

   (a) All licensees are required to coordinate their frequency usage with the
   co-channel or adjacent channel incumbent fixed microwave licensees in the
   1850–1990 MHz band. Coordination must occur before initiating operations
   from any base station. Problems that arise during the coordination process
   are to be resolved by the parties to the coordination. Licensees are
   required to coordinate with all users possibly affected, as determined by
   Appendix I to this subpart E (Appendix E of the Memorandum Opinion and
   Order, GEN Docket No. 90–314, FCC 94–144; TIA Telecommunications Systems
   Bulletin 10–F, “Interference Criteria for Microwave Systems,” May 1994,
   (TSB10–F)); or an alternative method agreed to by the parties.

   (b) The results of the coordination process need to be reported to the
   Commission only if the parties fail to agree. Because broadband PCS
   licensees are required to protect fixed microwave licensees in the 1850–1990
   MHz band, the Commission will be involved in the coordination process only
   upon complaint of interference from a fixed microwave licensee. In such a
   case, the Commission will resolve the issues.

   (c) In all other respects, coordination procedures are to follow the
   requirements of  Sec. 101.103(d) of this chapter to the extent that these
   requirements are not inconsistent with those specified in this part.

   (d) The licensee must perform an engineering analysis to assure that the
   proposed facilities will not cause interference to existing OFS stations
   within the coordination distance specified in Table 3 of a magnitude greater
   than that specified in the criteria set forth in paragraphs (e) and (f) of
   this section, unless there is prior agreement with the affected OFS
   licensee. Interference calculations shall be based on the sum of the power
   received at the terminals of each microwave receiver from all of the
   applicant's current and proposed PCS operations.

                                                      Table 3_Coordination Dist
ances in Kilometers
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                                                         PCS Base Station Anten
na HAAT in Meters
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                     EIRP(W)                         5      10      20      50
     100     150     200     250     300     500    1000    1500    2000
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0.1.............................................      90      93      99     11
0     122     131     139     146     152     173     210     239     263
0.5.............................................      96     100     105     11
6     128     137     145     152     158     179     216     245     269
1...............................................      99     103     108     11
9     131     140     148     155     161     182     219     248     272
2...............................................     120     122     126     13
3     142     148     154     159     164     184     222     250     274
5...............................................     154     157     161     16
8     177     183     189     194     198     213     241     263     282
10..............................................     180     183     187     19
4     203     210     215     220     225     240     268     291     310
20..............................................     206     209     213     22
1     229     236     242     247     251     267     296     318     337
50..............................................     241     244     248     25
5     264     271     277     282     287     302     331     354     374
100.............................................     267     270     274     28
2     291     297     303     308     313     329     358     382     401
200.............................................     293     296     300     30
8     317     324     330     335     340     356     386     409     436
500.............................................     328     331     335     34
3     352     359     365     370     375     391     421     440
1000............................................     354     357     361     36
9     378     385     391     397     402     418
1200............................................     361     364     368     37
6     385     392     398     404     409     425
1640............................................     372     375     379     38
8     397     404     410     416     421     437
2400............................................     384     387     391     39
9     408     415     423     427     431
3280............................................     396     399     403     41
2     419     427     435     439     446
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   (e) For microwave paths of 25 kilometers or less, interference
   determinations shall be based on the C/I criteria set forth in TIA
   Telecommunications Systems Bulletin 10–F, “Interference Criteria for
   Microwave Systems,” May 1994 (TSB10–F).

   (f) For microwave paths longer than 25 kilometers, the interference
   protection criterion shall be such that the interfering signal will not
   produce more than 1.0 dB degradation of the practical threshold of the
   microwave receiver for analog system, or such that the interfering signal
   will not cause an increase in the bit error rate (BER) from 10E–6 to 10E–5
   for digital systems.

   (g) The development of the C/I ratios and interference criteria specified in
   paragraphs (e) and (f) of this section and the methods employed to compute
   the interfering power at the microwave receivers shall follow generally
   acceptable good engineering practices. The procedures described for
   computing interfering signal levels in (Appendix I to this subpart E
   Appendix E of the Memorandum Opinion and Order, GEN Docket No. 90–314, FCC
   94–144) shall be applied. Alternatively, procedures for determining
   interfering signal levels and other criteria as may be developed by the
   Electronics Industries Association (EIA), the Institute of Electrical and
   Electronics Engineers, Inc. (IEEE), the American National Standards
   Institute (ANSI) or any other recognized authority will be acceptable to the
   Commission.

   [ 59 FR 32854 , June 24, 1994, as amended at  61 FR 29691 , June 21, 1996;  69 FR 75171 , Dec. 15, 2004]