6-106
SECTION 6
OPTIONS
6-15-8 MPT 1327/MPT 1343 NUMBERING SCHEMES
All signalling over air uses MPT 1327 numbering for the RU identity (7 bit prefix, 13 bit
identity). However, most RU’s use MPT 1343 numbering schemes to reduce the digits
dialed to two or three digits for calls within fleet. The conversion between 1343
numbers and 1327 identities is performed within the RU. It is impossible for the COM-
120C to determine the MPT 1343 number; however, the conversion between the two is
relatively easy.
To convert MPT 1343 to MPT 1327:
MPT 1327 PFIX = MPT 1343 PFIX – 200
MPT 1327 IDENT = (FLEET ID –2000)
x 2 + (FLEET NUMBER-20
or
200)
Example:
MPT 1343 ID = 201 2500 27
MPT 1327 PFIX = 201-200 = 001
MPT 1327 IDENT = (2500-2000) x 2 +
(27-20) = 1007
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