Aeroflex 2050T SERIES Especificações descarregar pdf (Página 19)

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0 Hz

Therefore channel plan = TETRA 800+0 MS (zero offset), chan-

nel = 2697

Note: the ETSI numbering scheme permits a small overlap of the

100 MHz bands (2.4 MHz overlap), since the channel numbering

extends to 4095. For example, a base station covering

395.000 MHz to 400.000 MHz would probably use channel

numbers 3800 to 4000 on band 3, rather than numbering the

last channel as channel number 0000 on band 4.

QQ66..1133::

Can I test a TETRA mobile that does not conform to the

ETSI channel numbering?

AA66..1133::

Yes. The USER DEFINED channel plan allows you to

define your own channel numbering scheme to match e.g. man-

ufacturers' proprietary numbering schemes, or to support other

TETRA channel plans which may be defined in future. Typically a

TETRA mobile may have a proprietary channel numbering

scheme when it has a factory default configuration before it has

been configured for a particular network, e.g. the lowest frequen-

cy supported by the mobile may be numbered as channel 0001.

The IFR 2968 can support any frequency from 100 MHz to 1 GHz.

Refer to the 2968 Phase 3.2 TETRA supplement issue 10, chap-

ter 3, pages 7 to 10 and pages 39 to 42, for details of the USER

DEFINED channel plan. Refer also to chapter 11, pages 1 to 3, for

details of the pre-defined and user defined channel plans.

QQ66..1144::

Can I ignore channel plans and channel numbers and set

the 2968 frequency in Hz?

AA66..1144::

Yes, but not for normal trunked mode mobile testing. The

IFR 2968 provides a 'NO PLAN' channel plan for setting the 2968

frequency in Hz instead of using a channel number. You can also

set frequencies directly in Hz in DUPLEX TEST mode; however

these frequency settings will be over-ridden when you return to

SYSTEMS. If you select NO PLAN in SYSTEMS mode and set the

required frequency in Hz, this will carry over to DUPLEX TEST

mode. Refer to the 2968 Phase 3.2 TETRA supplement issue 10,

chapter 3, for details of using NO PLAN: pages 7 to 10 (MS),

pages 27 to 29 (BS), pages 31 to 33 (DM).

Important note: When you are testing a base station or a direct

mode mobile, or a mobile in T1 test mode, you can ignore chan-

nel numbers and enter the transmitter frequency directly in Hz.

However, when you are testing a mobile in normal trunked mode

(MCCH) you will need to set up the 2968 with a channel plan and

channel number. The TETRA signalling protocol uses the channel

number, not the frequency, when the mobile is assigned to a traf-

fic channel or control channel. Therefore you must use the correct

channel plan and channel number for normal mobile testing.

Section 7 Q&A: Signalling and protocol operations

QQ77..11::

Does the IFR 2968 test signalling operations with Direct

Mode mobiles?

AA77..11::

Yes, with the Phase 3.2 software and Option 32. Mobile

Originated Direct Mode call set-up and clear down is supported

in accordance with DMO TIP TTR 002 v1.0.3. Relevant call set-up

parameters are displayed, providing information about the DMO

mobile under test and the type of call performed. The IFR 2968

does not test Mobile Terminated Direct Mode call set-up, i.e. it

does not simulate a Direct Mode mobile setting up a call to other

Direct Mode mobiles.

QQ77..22::

Can I see the signalling messages and parameters that the

2968 sends to the mobile and receives from the mobile?

AA77..22::

Yes. Full protocol analysis is provided with TETRALOG, an

optional PC based application that analyses the signalling mes-

sages (PDUs) and parameters (information elements) that are sent

and received by the IFR 2968. The sequence of messages is dis-

played graphically as a message sequence chart (MSC). Each

PDU and information element can be viewed fully decoded

according to ETSI EN 300 392-2 v2.3.2. For further details please

refer to the data sheet for 81514 TETRALOG and contact your local

IFR sales representative or distributor.

QQ77..33::

Is it possible to read the individual bits of the PDU fields

that the 2968 receives?

AA77..33::

Yes. TETRALOG shows the contents of every PDU received

(and sent) by the 2968.

These are shown as:

- hex data for the complete MAC PDU after channel decoding

(TMV-SAP)

- hex data for fragmented PDUs after re-assembly of the MAC

fragments

- hex / binary / decimal data (as appropriate) for each informa-

tion element

- decoded meaning for each information element (PDU field)

The 2968 also has the DATA screen in which individual burst data

can be seen, before and after channel decoding, in hex and bina-

ry as appropriate. However, this only captures and shows a single

burst and does not decode the PDU (which can be done in

TETRALOG).

QQ77..44::

Is it possible to edit the PDU fields that the 2968 sends ?

AA77..44::

Partially. Specific parameters can be set in the SET-UP:

System Parameters menu, and these will affect the contents of the

information elements (fields) in the PDUs that are sent by the

2968. In particular, the CALL TYPES: and MESSAGES: menus

allow configuration of various CMCE parameters. However, the

2968 is not designed as an editable protocol test script tester, i.e.

it does not execute TTCN test scripts. The PDU fields which are

not editable by the user are set by the 2968 protocol software.

Visibility of the fields is provided by the optional TETRALOG appli-

cation, which shows the value and meaning of every field (infor-

mation element) in every PDU sent and received by the 2968.

QQ77..55::

Is it possible to view and edit the SYSINFO and SYNC mes-

sages sent by the 2968?

AA77..55::

You can see the values of the editable parameters in the

[SET-UP] [System Params] menu. You can see the full content of

SYSINFO and SYNC messages using TETRALOG. You will see the

SYSINFO and SYNC messages in TETRALOG when you change

any of the parameter values or if you press the [restart MCCH] but-

ton, also when you clear down a call. You need to have TETRA-

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