Universal Tone Receiver (Utr) Features - Nortel DMS-100 Series Maintenance Manual

SCD252 for 1500-
A specified RCS supports one type of ringing. For example, an RCS
supports FSR but not coded, or coded but not FSR. A field in table
RCSINV indicates the type of ringing an RCS uses. Refer to the data
schema section of the Translations Guide for more information on Table
RCSINV datafill.
All line cards on an RCS use the type of ringing employed. When the
system employs FSR, single-party and coin line cards can be provisioned on
the RCS with FSR cards. The single-party and coin cards employ –R
ringing.
Three FSR systems are normally used: decimonic, harmonic and
synchromonic. Refer to the Translations Guide for more information about
FSR.
Dialing Two types of dialing are supported: dial pulse and Digitone.
Tones The following tones are supported:
dial tone
audible ringback
reorder
busy

Universal Tone Receiver (UTR) features

Subscriber lines that subtend an SMS can use the optional universal tone
receiver (UTR) feature. This feature allows part of the processing load to be
removed from the HOST computing module (CM) and implemented in the
PM.
When the UTR feature is present on the SMS, the SMS performs all digit
collection functions. These digit collection functions occur at the location of
the subscriber terminal. These functions include:
the allocation of a free receiver
the establishment of a path to the receiver
the collection of digits
the processing of digits
the deallocation of the receiver
Ω
loops
DMS-100 Family SMS Maintenance Manual XPM10 and up
SMS signaling 3-11