Reverse Battery Operation - Nortel Message Registration Description And Operation

Description Page 11 of 18
Refer to Circuit card installation and testing (553-3001-211) for switch
settings, connections and pad settings

Reverse Battery operation

When the CO trunk returns a Reverse Battery (RVB) signal, only one pulse
is received for each outgoing call. This pulse is passed to the software meter
for storage. The meter is incremented once for each metered local call
regardless of duration. Reversals received within 2 seconds of digit
outpulsing completion are ignored.
Message Registration Description and operation