Lm And Rlm Ringing Hardware; Ring Generator Interface - Nortel DMS-100 Series General Description Manual

2-2 Ringing in Series I peripherals
Figure 2-1 Series I peripheral ringing system architecture

LM and RLM ringing hardware

Ringing hardware for the LM and RLM is described next.

Ring generator interface

The NT2X27 RGI card interfaces the LM or RLM signal processor (SP) with
ringing generators. The RGI card communicates with the signal processor over
a bi-directional data bus (NT2X16/NT2X02). The signal processor sends
information on the active ringing generator and the ringing type to the RGI
over the bi-directional data bus. Upon receiving the information, the RGI
retrieves the appropriate ringing drive signal from its on-board memory and
applies the signal as a pulse-width modulated signal to the ring generator
amplifier input.
Six versions of the RGI are available to support the following ringing schemes:
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297-1001-131 Standard 06.01 October 2000
Bay 0
Signal processor
RGI 0 RGI 1
RGI–0
RGI–1
MUX
LC 0
Line drawer 0–19
20 Hz BOC (87 V RMS) - NT2X27AA
decimonic MF ringing - NT2X27AB
harmonic MF ringing - NT2X27AC
synchromonic 16 Hz ringing - NT2X27AD
LC 31
Bay 1
Signal processor
RGI 0 RGI 1
RGI–0
RGI–1
MUX
LC 0 LC 31
Line drawer 0–19