Ringing Generators; Ringing Generator Interface; Line Cards - Nortel DMS-100 Series General Description Manual

4-2 Administration of DMS ringing

Ringing generators

Following is a list of the LME and RLE ringing generators and the ringing
types each supports:
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The ringing generators installed in the LM or RLM must be compatible with
the ringing type assigned to the LM or RLM.

Ringing generator interface

The NT2X27 ringing generator interface (RGI) provides the interface between
the LM and RLM signalling processor and ringing generator. There are six
versions of the RGI:
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Line cards

In addition to appropriate ringing generators, the LM and RLM also must
contain the proper line cards to support the ringing assigned to the LM or
RLM. The type of line card required depends on the line class code and ringing
code assigned to the line. Line class codes and ringing codes are described in
297-1001-131 Standard 06.01 October 2000
NT2X27AA - coded and superimposed
NT2X27AB - decimonic and coded (30 Hz)
NT2X27AC - harmonic
NT2X27AD - synchromonic 16
NT2X27AE - synchromonic 20
NT2X27AF - BOC (105 VRMS)
NT2X27AA - 20 Hz Bell (87V RMS)
NT2X27AB - decimonic MF
NT2X27AC - harmonic MF
NT2X27AD - synchromonic 16 Hz
NT2X27AE - synchromonic MF
NT2X27AF - 20 Hz bell coded ringing (105 V RMS)
Note: For coded ringing, when 20 Hz coded ringing is to be used (ring
type set to C in field RNGTYPE of table LMRNG), use the NT2X27AA
RGI. When 30 Hz coded ringing is to be used (ring type set to C30), use
the NT2X27AB RGI.