Erlang question 2

[summerdike]

The Erlang B formula can, given a certain traffic intensity and a number of lines, predict the chance a telephone user will not be able to seize a line.
Let 's say this chance is 1 %.

Does this mean that of every 100 users trying to seize an outside line in 1 hour, one (of these users) will not be able to do so because of congestion?

______________________________
Fictitious Destination Table containing Fictitious Route Choices....

 

[Oldtimephoneguy]

Good morning. Try this website, it might help.

http://www.erlang.com/

Frank. City of Cape Coral, Florida

 

[ILECCLEC]

Further, you can use this calculator if you know your volumes....

http://www.telconassociates.com/traf.php

It is however not unlimited so check out this for more details and ability to predict huge volumes of traffic in the studies...


Erlang B Traffic Studies Table
To convert minutes to erlangs, min/60
e.g.
16258 minutes/60
=270.97 erlangs

http://www.quantumportal.com/Erltable7.txt

ErlangB Table
Program written by Ray Watson

http://www.quantumportal.com/erlangb.htm

GOS = 1.00000000000% --------------------------------

Trunks Required/ Erlangs
***SMALL SAMPLE OF RESULTS****
1 0.0101010
2 0.1525933
3 0.4554853
4 0.8694188
5 1.3607868
6 1.9090290
7 2.5009397
8 3.1275623
9 3.7825373
10 4.4611769
11 5.1599187
12 5.8759866

If you have raw data from the DMS for Traffic Studies than here is a legend I created for interpretation purposes.

Traffic Studies Registers
****ISDN PRI & LDT1****
INCATOT - Number of Outgoing Calls from the Customer to the Network
NATTMPT - Number of Incoming Calls to the Customer from the Network
NOVFLATB - All B-Channels busy (blockage and or overflow if designed)
TRU - Real Usage in CCS (Centium Call Seconds, 1 CCS = 100 seconds)
SBU - Network Maintenance in CCS
MBU - Network Maintenance in CCS
TOTU - Total Usage in CCS (TRU + SBU + MBU = TOTU)
Usage (Mins) - Conversion of TOTU to Minutes

****Virtual Facility Group****
VFGTOTOAL - Total number of calls (could be inbound or outbound depending on configuration)
VFGBLCKD - All B-Channels busy (blockage and or overflow if designed)
VFGLSCBL - Network Maintenance in CCS
VFGTRU - Total Usage in CCS (Convert to minutes by VFGTRU*100/60)

 

[Oldtimephoneguy]

Good afternoon. I think it considers both incoming and out going calls. I wish I had time to research it but

http://www.erlang.com/

has much information about it all.

Frank. City of Cape Coral, Florida

 

[jerryreeve]

ILECCLEC : good info.

----------------------------
JerryReeve
Communication Systems Int'l
com-sys.com