Instruction manual

HARDWARE AND SOFTWARE DETERMINATION
CALL CLASSIFIER (TN744)
Eight touch-tone receiver ports are provided on each TN744 Call Classifier circuit pack. The
TN744 circuit pack is used exclusively for receiving touch-tone input for the Call Prompting
feature, classifying outgoing calls for the Answer Detection feature, and classifying outgoing calls
for an outgoing call management system. Each of these are optional features that must be prop-
erly engineered. A maximum of 10 TN744 may be used in a G3i-Global system.
For G3i-Global, the number of TN744 ports required should also be calculated based on the
traffic capacity. To determine the traffic capacity, determine the number of MFC service ciruits
required by calculating the total time the service circuits are expected to be in use on calls during
the busiest time of the day. If the G3i-Global is using a mixture of MFC DOD and MFC DID and
call classification, add together the times calculated for each call type before looking up the com-
bined total of TN744 ports required for each call type.
The number of service circuit ports required for DID maybe calculated as follows:
1. Determine the average number of seconds after seizure before reception of the first digit.
This will vary depending on the type of switch on the other end, but assume 3 seconds if
the answer is not known.
2. Determine the number of digits to be received. Include the equivalent of one or two extra
digits for end of dial or group II signals.
● Singapore - digits + a group II signal
● Venezuela - digits
● Belgium - digits
● Saudi Arabia - digits + end of dial + group II signal
● CClTT - (digits + group I) or (digits + group I)
● Assume 6 if the answer is not known.
3. Multiply that by the seconds required to process each digit. Modem switches send at a
rate of 6 digits per second, or 0.17 seconds per digit. Older switches may send at a
lower rate. Belgian standard is 2 seconds per digit.
Assume 0.17 seconds per digit if the answer is not known.
4. Add to that 1 second for call setup time within the G3i-Global.
5. If you lack the information necessary to perform the above calculation, assume the USA
DTMF standard, which is 5.6 seconds, for the sum of all these things.
6. Multiply the sum by the expected number of DID calls per G3i-Global in the busy hour
and divide by 100. The result is called CCS (hundred call seconds).
7. Use the CCS and the following table to determine the number of service circuit ports
required.
124