NEC 2000 IPS manual Traffic Capacity per Line For TDM Circuits, Number of Trunks

Chapter 3 System Highlights

Traffic Capacity per Line (For TDM Circuits)

Traffic capacity per line (erl/L) can be calculated in accordance with the calculation procedure in Section 3.4. The traffic capacity per line at various line/truck configurations as the calculation result is shown in the following table. Though the following table does not cover all UNIVERGE NEAX 2000 IPS line/trunk configurations, it covers the typical TDM line/trunk configurations likely to be required in the actual system. Grade of service is considered as 0.01. Use the Erlang B Table to find the required number of DTMF register ports for a specific UNIVERGE NEAX 2000 IPS.

Unit = erl per line

Number of Trunks

Use Erlang B table to determine the number of trunks at a particular grade of service after using the following formulas:

Incoming: incoming ccs traffic

----------------------- = Erlang B

36 ccs

Outgoing: outgoing ccs traffic

----------------------- = Erlang B

36 ccs

Note: Traffic loads are measured in hundred call seconds, or CCS. Since there are 3,600 seconds in an hour, a line that's tied up for one hour measures 36 CCS traffic.

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