7.9.1. Feature description 
12 or 16 kHz metering pulses are sent to analog stations with the
classes of service "GET" and "Call charge metering pulse sending" or
to coin boxes (new COS). The frequency of the metering pulses (depending
on the time of day, type of day, zone, etc.) is either calculated by
the OpenScape 4000 system (charge pulse metering) or received by a higher-ranking
CO.
The OpenScape 4000 system supports the charge pulse types 16 kHz,
12 kHz, and line reversal.
A new SLMA board (SLMAR) was developed for sending the 12 kHz and
16 kHz pulses. The charge pulse types (16 KHz, 12 KHz, etc.) can be configured
per port.
A special charge pulse is configured in the OpenScape 4000.
The pulse sending procedures listed below can be configured (see AMO
GEFE / TTBL):
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Fixed metering pulse sending at connection setup
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One or more metering pulses are sent immediately
as basic charges. Pulses are not sent periodically (interval set to 0).
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Periodical metering pulse
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One or more metering pulses are sent immediately.
The pulses are then sent periodically according to the set intervals.
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Periodical "Karlsson" (K) metering pulse
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The first metering pulse is sent after a random
period of time which lies within the configured interval range. The pulses
are then sent periodically according to the set intervals. (Method 0)
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Periodical "Karlsson added" (KA) metering pulse
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The first metering pulse is sent immediately.
The next metering pulse is sent after a random period of time which lies
within the configured interval range. The pulses are then sent periodically
according to the set intervals. (Method 1)
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Periodical "Karlsson modified" (KM) metering
pulse
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The first metering pulse is sent immediately.
The next metering pulse is sent after a random period of time which lies
within a range of 2 times the configured interval. The pulses are then
sent periodically according to the set intervals. (Method 2)
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