Ringing System Maintenance; Ringing User Interface; Ringing Generator Overload Control; Rg Overload Control - Series I Peripherals - Nortel DMS-100 Series General Description Manual

5 Ringing system maintenance

Ringing user interface

The DMS-100 user interface allows ringing generators to be serviced from the
DMS-100 MAP terminal. Commands at the PM level of the MAP terminal
allow the ringing generators of most line PMs to be posted, manually busied,
tested, returned to service, and be made offline.

Ringing generator overload control

Software controls in the DMS-100 peripherals limit the loading on the ringing
generators. The controls implemented vary among the Series I and Series II
peripherals. A description of the ringing generator load controls implemented
in the Series I and Series II peripherals follows.

RG overload control - Series I peripherals

Series I peripherals consist of the line module (LM) and remote line module
(RLM). Ringing bus monitors in the LM and RLM monitor the voltage and
current on the ringing bus.
The ringing bus current monitor reacts when excessive current passes through
the bus. The current monitor reacts in the following three stages:
1. Detects ringing current at 10 mA.
2. Reports over current condition at 350 mA.
3. Limits the output current (shutback) at 800 mA.
The ringing bus voltage monitor reacts when the ringing voltage on the ringing
bus is too low or too high. The voltage monitor reacts in two stages:
1. Detects ringing voltage at +/- 20 V.
2. Detects overvoltage condition when voltage exceeds 150 V for more than
When the current or voltage threshold is exceeded, the LM software stops
processing any further ringing requests until the current or voltage falls below
the threshold. Incoming calls during the ringing generator overload state are
blocked.
1.5 seconds (s).
DMS-100 Family DMS-100 Ringing System BASE15 and up
5-1