Nortel DMS-100 Series Maintenance Manual page 57

The RLCM software controls the LCC clock source, which is
frequency-locked to the primary DS-1 links. The RLCM software does not
control the LCC clock source when the two units of the LCM are inactive.
The LCM hardware forces each LCM unit to take the clock source from the
associated LCC.
Other host office functions
Software resident in the host DMS-100 Family office controls the following
software:
class of service
code interpretation
screening
routing
billing
Signaling and supervision
Signaling allows the DMS-100 switch to communicate with switch stations
or other switching offices. The RLCM uses DMS-X protocol to
communicate over RCLM DS-1 links with the host office. The DMS-X
transmits and receives message data over full-duplex media like the DS-1
links. The DMX-X is a half-duplex, byte-oriented protocol that is like
DS30. The DMS-X is a state-driven code, that requires
handshake-messaging between the RLCM and host at each stage of data
transfer.
The byte transfer rate over DS-1 channels is 125 bytes for each s.
Subscriber tones
The host LTC/LGC provides properly cadenced tones, which the RLCM
applies to subscriber lines. The tones that the host LTC/LGC supports and
the RLCM applies are:
dial tone
audible ringing
warble (MDC Meridian business set ringing)
busy tone
reorder tone
receiver off-hook (ROH) tone
The RLCM depends on the DMS-100 switch CC. The RLCM does not take
part signaling between the host office and other systems.
DMS-100 Family RLCM Maintenance Manual XPM12 and up
Maintenance overview 1-41