f. In a mixed subnetwork, both PRSL and NNX subnetworks coexist within a single MYX area
Within each MYX area, each PR area and each NNX code must be unique. An MYX area containing
mixed subnetworks, must have no NNX code in which the NN portion is the same as a PR code. In the
same way, within each PR area, each SL code must be unique.
g. Subscriber number. The last three digits in a PRSL numbering scheme make up the subscriber
number. In an NNX numbering scheme, the last four digits make up the subscriber number. The
subscriber number takes the form of XXX or XXXX where X = 0-9.
2. Numbering plan. This paragraph provides general information concerning numbering plans found
in the fixed and tactical environments.
a. Commercial numbering plan. The commercial telephone systems use a 10-digit numbering plan
as follows:
NYX-NNX-XXXX, where--
NYX
=
area code
NNX
=
switch code
XXXX
=
subscriber's number
We use the following numbers:
N
=
2-9
Y
=
0, 1
X
=
0-9
b. DSN numbering plan. This is a subset of the commercial numbering plan.
NYX-NNX-XXXX, where -
NYX
=
area code
NNX
=
switch code
XXXX
=
subscriber's number
We use the following numbers:
N
=
2-9
Y
=
0, 1
X
=
0-9
2-3
SS 0029
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