Telecom Technical Specifications




старонка6/8
Дата канвертавання25.04.2016
Памер1.14 Mb.
1   2   3   4   5   6   7   8


Loop Simulator

EUT

SW

PSTN Port 1

PSTN Port 2

Ext.

Port 2


600Ω

Reference

Load

Figure 42 Crosstalk test configuration


  1. Crosstalk Test method:

  1. Set two connections with PSTN lines by two referenced 600Ω reference load.

  2. Set AC Signal Gerenator to connect with loop simulator.

  3. Adjust Signal Generator to get 1 kHz 0 dBV at PSTN port 2.

  4. PSTN port 1 and Ext. port 1 is no signals applied.

  5. Set spectrum analyzer frequency range at 200 Hz to 4000 Hz.

  6. Measuring the peak level Vp1 at PSTN port 1 and Ext. Port 1(dBv)

  7. Caculate crosstalk loss = 0 – Vp1.

  8. Set AC Signal Generator to connect with reference 600Ω load. repeat step (3) to (7).

  9. Selecting another port of extensions and PSTN lines of EUT, repeat step (1) to (8).

  10. The minimum value get from step (1) to (9) is the crosstalk loss.

Test equipment:

  1. AC Signal Generator.

  2. Loop Simulator  2.

  3. Spectrum Analyzer.

  4. 600Ω Reference Load  2.

5.5 Protocol requirement


Data Equipments using communication protocal should follow the recommandations of ITU-T.

A declaration of conformance to this requirement should be provided from the supplier.



5.6 Caller ID requirement

5.6.1 FSK signals inspection standard


The test case and definition of test data is attached in Appendix I.

5.6.1.1 AC / DC Termination

5.6.1.1.1DC Termination

Requirement: The controller is set to transmit a valid alerting signal to the TE to place in the signal state. The current drawn by TE in the signal state is calculated from measurement of the voltage across R1.

The current drawn by TE shall not exceed 0.5 mA.

Purpose: To make sure the loop current drawn by the caller ID equipment is not over the limits lead to on line state of PSTN.

Test method:



    1. DC termination test configuration as Figure 43.




C:2μF±10%



    1. DC termination test method:

  1. Set the Simulated Signal Generator to send the alerting signal.

  2. Check the EUT is at signal state.

  3. Measure and record the DC voltage on the 1 kΩ resistor.

  4. Caculate the DC current = V / 1000.

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator

  3. Storage Type Oscilloscope.



5.6.1.1.2 AC Termination

Requirement:During the signaling state the TE shall present the following AC conditions: an impedance not less than 8 kΩ, but with a phase angle not exceeding +5° over the frequency range 200 Hz to 4 000 Hz; Compliance shall be by suppliers declaration.

Purpose: To make sure the input impedance can meet the requirement of PSTN.

Test method:


    1. AC termination test configuration as Figure 44.

Storage Type Oscilloscope

CH1 CH2



AC Signal Generator


Loop


Simulator

EUT


C:2μF±10%

1kΩ




V2


V1





Figure 44 AC termination test configuration




    1. AC termination test method:

  1. Set the EUT at signal state.

  2. Set the Simulated Signal Generator to send 200 Hz signal and adjust the level of V1= 3Vrms at EUT side.

  3. Measure and record the AC voltage level of V2.

  4. Caculate the AC impedance Z = V1 / (V2  1000).

  5. Use Storage Type Oscilloscope to measure and record signal of V1 and V2.

  6. Caculate the phase angleθby:

θ= △t 50ms  360.

  • t : the difference of timeing V1 and V2.

  1. Repeat steps (3) to (6) by set the AC Signal Generator to send from 200 Hz to 4000Hz signal.

Test equipment:

  1. AC Signal Generator.

  2. Loop Simulator.

  3. Storage Type Oscilloscope.

  4. AC Voltage Meter V1, V2

5.6.1.2 Timing

5.6.1.2.1 Alerting case

Requirement:The controller is set to transmit the test packet TP1 to the TEUT for each following test cases.

Table 7: Timing requirements DT-AS



TAS case

Modem case

Result

DT1

FSK1

Correct reception of FSK data

DT2

FSK1

Correct reception of FSK data

DT4 first ring pattern starts 1 sec after end of TAS single ring burst

FSK1

TEUT return to the idle state at the start of first ring pattern

No message or error displayed



DT4

No data packet

TEUT return to the idle state

DT4

FSK1

Correct reception of FSK data

DT5

FSK1

Correct reception of FSK data

Purpose: To make sure the correct function of caller ID equipment at each signal condition.

Test method:



    1. Alerting case test configuration as Figure 45.

Simulated Signal Generator


Loop


Simulator

EUT


C:2μF±10%




Figure 45 Alerting case test configuration




    1. Alerting case test method:

  1. Set the EUT at idle state.

  2. Set the Simulated Signal Generator to send signal of each TAS case and Modem case as listed in table 6.1 and sending the message of test pattern TP1.

  3. After the EUT received the signals, check the result with Table 7.

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.



5.6.1.2.2 Start Time

Requirement: The TE shall enter the signaling state within 45ms from the end of the DT-AS. Compliance shall be by supplier declaration.

Purpose: To make sure caller ID can receive FSK signal after DT-AS signal is received.

Test method:


  1. Start Time test configuration as Figure 45.

  2. Start Time test method:

  1. Set the EUT at idle state.

  2. Set the Simulated Signal Generator to send DTAS(Dual tone alert signal) and after 45ms, send the FSK Data Signal.

  3. Check the FSK Data received by the EUT is correct as set in step (2).

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.



5.6.1.2.3 End Time

Requirement:The TE shall leave the signaling state and revert to the idle state within 150ms from when the caller display message has been completely signaled. Compliance shall be by supplier declaration.

Purpose: To make sure caller ID can go back to idle state after the FSK signal is received.

Test method:


    1. End Time test configuration as Figure 45.

    2. End Time test method:

  1. Set the Simulated Signal Generator to send FSK1 Data Signals and after 150ms, send the FSK2 Data Signal.

  2. Check FSK1 Data is only recevied by EUT.

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.



5.6.1.3 Signaling case

5.6.1.3.1 Frequency, Level, Twist and Interference tolerance

Requirement:The controller is set to transmit the test packet TP1 to the EUT for table 8 each test cases.

Purpose: To make sure caller ID can correctively receiving the FSK signals.

Test method:


  1. Frequency, Level, Twist and Interference tolerance test configuration as Figure 45.

  2. Frequency, Level, Twist and Interference tolerance test method:

  1. Set the EUT is at idle state.

  2. Set the Simulated Signal Generator to send signal of each TAS case and Modem case as listed in table 6.2 and sending the message of test pattern TP1.

  3. After the EUT received the signals, check the result with Table 8.

Table 8: Signaling requirements



TAS case

Modem case

Result

DT5

FSK1

Correct reception of FSK data

DT5

FSK2

Correct reception of FSK data

DT5

FSK3

Correct reception of FSK data

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.



5.6.1.4 Packet case

5.6.1.4.1 Channel seizure

Requirement: The controller is set to transmit the test message DT5:FSK1:TP1 to the EUT. Check the message is correctly interpreted by the EUT.

Purpose: To make sure caller ID can correctively receiving the FSK signals.

Test method:


    1. Channel seizure test configuration as Figure 45.

    2. Channel seizure test method:

  1. Set the EUT at idle state.

  2. Set the Simulated Signal Generator to send test data of DT5:FSK1:TP1.

  3. Check the data is received and displayed on EUT correctly.

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.



5.6.1.4.2 Mark

Requirement:The controller is set to transmit the test message DT5:FSK1:TP1 to the EUT. Check the message is correctly interpreted by the EUT.

Purpose: To make sure caller ID can correctively receiving the signals.

Test method:


    1. Mark test configuration as Figure 45.

    2. Mark test method:

  1. Set the EUT at idle state.

  2. Set the Simulated Signal Generator to send test data of DT5:FSK1:TP1.

  1. Check the data is received and displayed on EUT correctly.

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.



5.6.1.4.3 Message type

Requirement:The controller is set to transmit the following test message to the EUT.

Check that each message is correctly interpreted by the EUT.

Table 9 Message Type


Test data

Test case

Result

DT5:FSK1:TP1

(call setup type message)

Correct reception of FSK data

DT5:FSK1:TP2

(* Optional)



(message waiting indicator type message) (test on/off alternate)

Correct reception of FSK data

DT5:FSK1:TP5

(non call setup type message)

rejected or an error message

Note: the function of caller ID is optional for this item.

Purpose: To make sure caller ID can correctively receiving the FSK signals.

Test method:


    1. Message type test configuration as Figure 45.

    2. Message type test method:

  1. Set the EUT at idle state.

  2. Set the Simulated Signal Generator to send smessages as listed in table 9.

  3. Check the results of EUT meet with Table 9.

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.



5.6.1.4.4 Checksum

Requirement: The controller is set to transmit the test message DT5:FSK1:TP6 to the EUT (incorrect checksum). Check the message is correctly rejected or an error message displayed by the EUT.

Purpose: To make sure caller ID can detect the error messages.

Test method:


  1. Checksum test configuration as Figure 45.

  2. Checksum test method:

  1. Set the EUT at idle state.

  2. Set the Simulated Signal Generator to send test data of DT5:FSK1:TP6.

  3. Check the message is correctly rejected or an error message is displayed on the EUT.

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.



5.6.1.5 Presentation layer messages case


Requirement:The test controller is set to transmit the test messages as listed in Table 10 to the EUT. Check that each message is correctly interpreted by the EUT.

Purpose: To make sure caller ID can correctively receiving and displaying the FSK signals.

Test method:


    1. Presentation layer messages case test configuration as Figure 45.

    2. Presentation layer messages case test method:

      1. Set the EUT at idle state.

      2. Set the Simulated Signal Generator to send smessages as listed in table 10.

      3. Check the results of EUT meet with Table 10.

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.


Table 10: Presentation layer messages


Test data

Test case

Result

DT5:FSK1:TP7

Call type: ring back when free (valid CLI message)

Message ignore

DT5:FSK1:TP8

Call type: absent (valid CLI message)

Correct reception of FSK data

DT5:FSK1:TP9

Call type: voice (valid CLI message)

Correct reception of FSK data

DT5:FSK1:TP10

Call type: voice (valid CLI message)

Correct reception of FSK data

DT5:FSK1:TP11

Call type: message waiting(valid message)

Message either ignore or Correctly displayed

DT5:FSK1:TP13

Call type: voice (maximum length valid CLI message)

Correct reception of FSK data

DT5:FSK1:TP14

(* Optional)



Call type: voice (valid CLI message)

Correct reception of FSK data

DT5:FSK1:TP15

(* Optional)



Call type: voice (valid CLI message)

Correct reception of FSK data

Note: the function of caller ID is optional for this item.

5.6.2 DTMF signaling Test criteria


The following test cases and data is defined as Appendix II.

5.6.2.1 DC resistance in the NIT state


Requirement: In the NIT state the DC resistance between the line terminals shall be great than

90 kΩ.


Purpose: To make sure the impedance of caller ID is no interference to PSTN.

Test method:



    1. DC resistance in the NIT state test configuration as Figure 46.

Loop


Simulator

EUT


DC Current Meter






Figure 46 DC resistance in the NIT state test configuration


    1. DC resistance in the NIT state test method:

      1. Set the EUT at NIT state.

      2. Measure and record the DC current Idc.

      3. Caculate the DC resistance = 48V / Idc.

Test equipment:

  1. Loop Simulator.

  2. DC Current Meter.

5.6.2.2 Leaving the NIT state


Requirement: When the number information transfer is completed, the TE shall leave the NIT state and return to the quiescent condition with the ringing function.

Criteria for leaving the NIT state.

The transfer of number information is to be regarded as completed when one of the following criteria are met:


  1. The DTMF code "C" (end code) is received;

  2. Ringing signal is received;

  3. After receipt of a DTMF code the DTMF pause condition is present for more than 1 sec.

At least the criteria 2. And 3. Shall be supported by the TE, as these criteria will guarantee in both normal and abnormal number information transfer procedures, that the NIT state is left before or as soon as possible after the line comes into loop condition.

Purpose: To make sure caller ID can go back to idle state after the DTMF signal is received.

Test method:


    1. Leaving the NIT state test configuration as Figure 46.

    2. Leaving the NIT state test method:

  1. Set the EUT at idle state.

  2. Set the Simulated Signal Generator to send test signals of DTMF1 data / End Code / DTMF2 data.

  3. Check there is only DTMF1 data displayed on EUT.

  4. Set the Simulated Signal Generator to send test signals of DTMF1 data / Ringing Signal / DTMF2 data.

  5. Check there is only DTMF1 data displayed on EUT.

  6. Set the Simulated Signal Generator to send test signals of DTMF1 data, stop to wait for 1 second then send test signals of DTMF2 data.

  7. Check there is only DTMF1 data displayed on EUT.

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.



5.6.2.3 DTMF signaling


Requirement:The Tolerance of Frequencies, Timing, Level and differences features of DTMF codes received between the line terminals is performed as following table 11.

The EUT receiver performance must be:



  1. Receiving level (high, low group):-3 to -24dBm.

  2. Maximum level difference between two frequencies:5dB.

  3. Frequency tolerance: within +/- 1.5%.

Purpose: To make sure capability of caller ID in receiving the DTMF signals.

Test method:



  1. DTMF signaling test configuration as Figure 45.

  2. DTMF signaling test method:

  1. Set the EUT at idle state.

  2. Set the Simulated Signal Generator to send test signals as the limits in the requirements of the Receiving Level, Maximum Level Difference between two frequencies, Frequency Tolerance and the conditions and code listed in Table 11.

  3. Check the correct code is displayed on EUT.

Table 11 DTMF signals



Signaling

case



Code

Number



result

DS1

TC2

Correct reception of number

DS2

TC2

Correct reception of number

DS3

TC2

Correct reception of number

DS4

TC2

Correct reception of number

DS5

TC2

Correct reception of number

Test equipment:

  1. Simulated Signal Generator.

  2. Loop Simulator.



5.6.2.4 DTMF Code / Number


Requirement:

Purpose: To make sure capability of caller ID in receiving the DTMF signals.

Test method:


    1. DTMF Code / Number test configuration as Figure 45.

    2. DTMF Code / Number test method:

  1. Set the EUT at idle state.

  2. Set the Simulated Signal Generator to send each Signaling Case and numbers as listed in Table 12.

  3. Check the results of EUT meet with Table 12.

Test equipment:

  1. Simulated Signal Generator.


  2. Signaling Case

    Code / Number

    Result

    DS1

    TC1

    Correct reception of number

    DS1

    TC3

    Call restriction

    DS1

    TC4

    Call restriction
    Loop Simulator.

Table 12 DTMF Code/Number

5.6.2.5 Guarding against interference from the parallel equipment


Requirement:The Caller ID must guard against interference from the parallel equipment which is in communication state.

Purpose: To make sure the Caller ID can guard against interference from the parallel Terminal equipment which is in communication state.

Test method:

1. Test configuration of guarding against interference from the parallel equipment is as Figure 47.

2. Test method of guarding against interference from the parallel equipment:


  1. Set the EUT at idle state.

  2. Set parallel TE at Off Line state.

  3. Set the Simulated Signal Generator to send DTMF Signaling Case and Numbers.

  4. Check there shall be no error of codes displayed on EUT.

C:2μF±10%



Parallel Terminal Equipment

Loop Simulator



Simulated

Signal Generator

EUT

Figure 47 Test configuration of guarding against interference

from the parallel equipment


Test equipment:



  1. Simulated Signal Generator.

  2. Loop Simulator

  3. Telephone set.



1   2   3   4   5   6   7   8


База данных защищена авторским правом ©shkola.of.by 2016
звярнуцца да адміністрацыі

    Галоўная старонка