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Here
is a brief introduction to the calculator. For more detailed information, press the Help
Button. For a running record of the results calculated, press the Results button.
Both these functions open new browser windows on your desktop.
- If you know the number of sources and two of the other figures, you can work out the
fourth as follows:
- Enter the number of traffic sources in the Sources box.
- Click on the Unknown radio button representing the unknown variable.
- Enter the 2 other known figures into their edit boxes.
- Press Calc and the result will be calculated and displayed in the remaining edit
box.
- For example, imagine that you have 100 telephone extensions on a PBX, generating 35
Erlangs of traffic during the busy hour and that this traffic is offered to a PSTN link
used solely for that outbound traffic. To calculate how many lines are required in
that trunk group if 2% blocking is acceptable:
- Enter 100 in the Sources box.
- Press the Lines Unknown radio button (this is selected by default).
- Enter 35 in the BHT edit box.
- Enter 0.02 in the Blocking edit box.
- When you press the Calc button, 43 will be displayed in the Lines edit box
indicating that 43 lines would be required in this trunk group. By contrast, the Erlang B Calculator, which does not take the number
of sources into account, would report that 45 lines are required.
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VoIP
Select is a flexible telecommunications calculcator. It includes a number of
stock calculators, including an Engset calculator (pictured below). In addition, it
allows you to design your own calculator by interconnecting calculator building blocks
such as Engset, Erlang B and Voice over IP bandwidth. VoIP Select works up to 25,000
lines.
The Engset Calculator in VoIP Select
VoIP Select is available for immediate download. If you pay using
VISA, MasterCard, American Express or Diners Club, you can have this software working
on your PC in five minutes!
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| Westplan is a revolutionary software package which simplifies the
complicated design process involved in creating effective voice networks that are based on
either traditional circuit switching or Voice over IP. All calculations are based on an
inter-nodal traffic model which you can specify yourself, or allow Westplan to estimate. 
Westplan main window, with a network drawing in view
By allowing you to try different network topologies, Westplan quickly helps you to make
informed judgements on the suitability of particular voice networking strategies to your
company. You will be in a stronger position to understand your voice network costs and
therefore to control your network resources.
Westplan supports these features:
- Point and click network diagrams
- Voice over IP bandwidth calculations
- Layer 2 support for PPP, Frame Relay, Ethernet, ATM and HDLC
- Analogue, T1 and E1 transmission facilities
- User-definable routing rules
- RTP compression for VoIP
- Full justification reports for each analysis
- Clear printed reports
- Context sensitive help
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