Mpt 1327/Mpt 1343 Numbering Schemes - IFR COM-120C Operation Manual

SECTION 6
OPTIONS

6-15-8 MPT 1327/MPT 1343 NUMBERING SCHEMES

All signalling over air uses MPT 1327 number ing for the RU identity ( 7 bit pr efix, 13 bit
identity) . However , most RU's use MPT 1343 number ing schemes to r educe the digits
dialed to two or thr ee digits for calls within fleet.
number s and 1327 identities is per for med within the RU. It is impossible for the CO M-
120C to deter mine the MPT 1343 number ; however , the conver sion between the two is
r elatively easy.
To conver t 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
The conver sion between 1343
6- 106