FIRMWARE DESCRIPTION
System Security
16
2.10
•
19.01.2007
3.2.1 DECT
Identities
The DECT standard defines identities for PTs and FTs that are used for mutual identification
and authentication. Standard EN 300 175-6 contains a detailed description of these
identities.
The following sub-sections contain a summary of the DECT identities and their usage.
3.2.1.1 FT
related
Identities
A FT is identified by an
ARI
(access rights identity).
According to the DECT standard a FT may own multiple ARIs, which are called
PARI
(primary ARI), SARIs (secondary ARIs) and TARIs (tertiary ARIs). In accordance with the
GAP service profile (EN 300 444) HW 86012/22 supports one ARI which is then the PARI.
SARIs and TARIs are not supported.
The DECT standard allows different ARI classes. HW 86012/22 (as FT) uses most ARI class
A, but ARI class B and C are also supported. However HW 86012/22 (as PT) is
interoperable with FTs that use a different ARI class.
The ARI class A is a 36 bits wide, world-wide unique identifier. It is factory-burnt into the
module during production and cannot be modified.
However the factory-burnt ARI can be overloaded by a user-defined ARI. The administration
of multi-cell networks is simplified, if all RFPs carry the same ARI. Please see the
configuration command SIARI.
The structure of the ARI class A is shown below.
0
0
0
EMC
FPN
b35
b34
b33 b32
...
b17 b16
...
b0
The three leftmost bits are always zero. This identifies ARI class A.
The
EMC
(ETSI manufacturer code) is a 16-bit value that has been assigned by ETSI to a
manufacturer. Höft & Wessel has assigned the EMCs 322 and 2921 (decimal).
The
FPN
(DECT fixed part number) is a 17-bit value that is unique in the context of an EMC.
It is assigned by the manufacturer.
Höft & Wessel uses an internal code, the
DNR
(DECT serial number) to uniquely identify
modules. The DNR is a 20-bit value. The FPN is derived from the DNR through integer
division by eight:
FPN = DNR div 8
In a multi-cell environment the FT consists in multiple RFPs. In a single-cell environment
there is only one RFP.
Each RFP is identified by a
RFPI
(radio fixed part identity). It consists in the PARI of the FT
and the RPN (radio fixed part number). The
RPN
is used in multi-cell networks in order to
distinguish between RFPs which have the same ARI.
RPN shall be 0 for standalone RFP (single-cell environment) and 1 to 7 for multi-cell
systems.
For more complex installations with more than 7 RFPs please contact Hoeft & Wessel for
ARI class B.