I am looking to groom some trunking between 2 switches I have. When attempting to do the formulas for determining Erlangs the number of trunks it is telling me I need is no where close to what I have and they are at 80% capacity. Looking at the statistics I have 123047 CCS in a 24hr period. This gives me 142.42 Erlangs. With that number I come up with 161 trunks needed @ 1%. I have 792 trunks configured for this with 80% capacity so I’m obviously doing something wrong with my calculations
123,047 CCS over 24 hours, that’s nothing. As you said, that’s only 142.5 erlangs !
So there is a glitch somewhere, le’s see…
1/ Why do you think you need to increase your capacity ?
2/ How many channels in one of your trunks ?
There is, it seems, a mistake of a factor “4”. So I believe that one you say “trunk”, you actually refer to an E1 nibble (16kb/s)
While a call in your system seems to be actually using 64kb/s timeslots.
Therefore you need 161 * 64kb/s, which translates in 161*4 “trunks”, which is 644 trunks. Now, there is a 80% load limit, so you actually need 805 trunks (644/0.8).