[CYW]

Hi,
I am not sure how to
a) calculate the carry traffic and
b) calculate the traffic blocked

for an E1 circuit installed between a PBX in a Call Center & a local exchange, if the GoS is 1%.

Does E1 play any role in that question to solve a) & b)?

MANY THANKS!

[Julian]

An E1 consists of 24 channels. You may easily look up from an Erlang-B table for the traffic corresponding to a 24 channels with 1% blocking. The figure is 15.3 Erl. It means that an E1 can support a traffic of 15.3 Erl with a tolerance of 1% being blocked.

It appears (I’m not quite certain) that 0.153 Erl traffic would be blocked. The “carry traffic” should then be 15.147 erl [15.3 less 0.153].

In your case, the capacity of the bottleneck should be of concern. And the bottleneck may not (actually, not likely to be) the E1.

Please correct me if I am not right.

[Tom]

No, an E1 is 30 channels; sometimes 31. A T1 is 24 channels.

[Julian]

Oh! Thanks Tom. Please forgive my err!

[Author]

Posts