7.9.2.1. Charges for analog stations 
The features "extended loop" and "Send metering pulse" are mutually
exclusive.
The level is set with the AMO SCSU and is dependent on the station
and line length.
The maximum line length is currently 300 m (approx.).
Metering pulses from the CO are converted on a one-to-one basis by
the SLMAR.
Call charge information generated by the remote system is split by
the CCUC parameter in the AMO ZAND and then forwarded as pulses by the
SLMAR.
Separate clock tables must be configured with the AMO TTBL for internal
and network-wide CDR by carrier and zone. Only the clock tables of the
TTBL group are used for timer pulse generation. Clock tables in other
groups are not analyzed by the software.