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4-2 Administration of DMS ringing

297-1001-131 Standard 06.01 October 2000

Ringing generators

Following is a list of the LME and RLE ringing generators and the ringing

types each supports:

• NT2X27AA - coded and superimposed

• NT2X27AB - decimonic and coded (30 Hz)

• NT2X27AC - harmonic

• NT2X27AD - synchromonic 16

• NT2X27AE - synchromonic 20

• NT2X27AF - BOC (105 VRMS)

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:

• 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.

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

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Universal Remote DMS-100 Spezifikationen Seite 118