- Read the description of DEFINITY exchange and BCM50 exchange in the tutorial. Become acquainted the exchanges and the equipments attached to them With the help of the teacher in the laboratory rooms!
Fill out the following table based on the explanation of the teacher and the tutorial.
Question | Definity | BCM 50
|
---|
In what lab room is the exchange located? | |
|
What kind of equipments can be attached to the exchange? | |
|
What is the capacity of the exchange? | |
|
How can we identify a port in the exchange | |
|
Answer the following questions:
- What is the similarity and the difference between the interfaces of the digital telephone and ISDN telephone?
- What is the similarity and the difference between the digital telephone equipment and the VoIP telepfone equipment?
- Find the data record of the IP telephone on your measuring place in the database of BCM50 exchange! Based on the information in the record answer the following questions:
- What is the dialing number of the next equipment in the case of conditional call froward?
- What kind of services are assigned to the function buttons?
To interpret the identifiers found in the equipment record you can use the text database from the tutorial.
- Check the services assigned to the function buttons and write a short description about the operation of the service denoted by the teacher!
- The user guide of the telephone can be found in the black folder on the measuring place.
- The functionality of function buttons can be checked with the Feature * 0 code.
- Study the signals of an digital telephone interface with the help of the oscilloscope in the case of 50 us/div and 2 us/div settings.
Insert both signal shapes into your report!
Based on these results answer the following questions:
- What is the mode of signal transmission?
- What is the bit rate and the Baud rate of the interface?
- What kind of line coding is used?
The recording of the oscilloscope screens should be performed out by the two neighboring students together but the results have to be evaluated separately!
- Based on the signal shapes recorded previously and published in the tutorial study the signal at the line interface of VoIP telephone.
Based on these figures and information answer the following questions:
- What is the mode of signal transmission?
- What is the bit rate and the Baud rate of the interface?
- What kind of line coding is used?
- Find the data record of the IP telephone on your measuring place in the database of BCM50 exchange! Based on the information in the record answer the following questions:
- What is the port address of the telephone?
- What is the dialing number of the telephone?
- What is the MAC address of the telephone?
- What is the IP address of the telephone? What is the speciality of this address?
- What kind of procedure is used to give IP address to the phone?
- Examine the ISDN PRI (PCM) trunk (link) mode in the database of the Definity exchange.
- This task can be performed out by all of the students together!
- First log in to the Definity exchange using the maintenance terminal.
(The description of the login procedure
can be found besides of the terminal in a folder.)
- List the trunk group data blocks (list tr) and find out
the number of the trunk which is under test (trno)!
- From the data block of the tested trunk (disp tr trno) we can
determine, what ISDN PRI (PCM) interface card should be examined
(4.tab, 'port' column ->portid (1axxyy xx-card number, yy-time slot)
) and what signal group (Sig_Grp) the trunk belongs to. After that the
parameters of the tested PCM trunk can be read out from the datablock of
the card.
Based on the content of the data blocks answer the following questions:
- What is the type of PCM frame? (disp ds1 portid (1axx))
- What line coding is used? (disp ds1 portid (1axx))
- What time slots are assigned to the trunk?
- In what sequence will the time slot reservation be made ? (disp tr trno 1.tab, trunk hunt parameter)
- What PCM time slot is used to forward trunk signaling and what is the topology of signaling link? (disp sig Sig_Grp )
- Call analysis
Connect EQS-133D or EQS-133B Analyser to the trunk between the two Definity
exchange according to the following figure:
- Start the handling program of the EQS-133D or the EQS-133B on the PC.
(start menu\run\eqs133d\mai.exe or eqs133b\mai.exe )
- Configure the analyzer using the infromation from the previous task!
- Set 'Report_Parameters' (right click on the 'Result' field) to 'off'!
(We will see every signal message as 1 row in the list.)
- Start the registration (F9 button)!
- Make a call from telephone "A" to telephone "B", answer the call, then
finish it!
- Stop the registration (F9 button)!
- Examine the recorded messages using the different 'report generation' modes:
- Received - the recorded messages are displayed in 'hexdump' format
- Decoded - the recorded messages are displayed in decoded format
This can be changed in the 'Report_Parameters' (right click on the 'Result'
field) menu (after setting click on the blinking 'Refresh' button):
- off - Every message displayed as 1 row. Decoding: L2 + L3 Message type
- dump - Decoding: L2 + L3 Message type and the remaining part of the message in 'hexdump' format
- short - Decoding: L2 + L3 Message type + parameter or information element (IE) and the remaining part of the message in 'hexdump' format
- Cnf/Res -> secondary result field -> MsgCompl - decoding of a complete message
(Saving to text file: File menu/Export result or right click on the 'Result'
field and select 'Export'.
When inserting the text file into the report "Courier new" font should be
used with the font size which not effects line break!
Please insert only that parts of the exported result into the report which
confim the answers has been given to the following questions!)
- Answer the following questions and insert recorded results to confirm the answers!
- What Layer 2 frames did occure during the examination?
- What Layer 3 messages and information elements did occure during the examination?
- What service was requested by the subscriber (Speech, Audio ...)?
- What coder was used to trasmit voice?
- What was the duration of the call?
- How the call was finished (Cause Value)?
- Study of network services, programming of dialing plans, trunks
Follow the way of a call, which goes out of BCM50 from phones of the measurement
place, and arrives to there with the help of configuration managements programs
of exchanges (BCM 50, Definity)
in the test network!
Check and record the value of Tx CPN with the help of BCM 50 Monitor program!