Nortel DMS-100 Series General Description Manual

Also see for DMS-100 Series: User guide Product guide Manual Maintenance manual Maintenance manual

Contents

Nortel DMS-100 Series General Description Manual Manual pdf 125 page image

DMS-100 Family DMS-100 Ringing System BASE15 and up5-15 Ringing system maintenanceRinging user interfaceThe DMS-100 user interface allows ringing generators to be serviced from theDMS-100 MAP terminal. Commands at the PM level of the MAP terminalallow the ringing generators of most line PMs to be posted, manually busied,tested, returned to service, and be made offline.Ringing generator overload controlSoftware controls in the DMS-100 peripherals limit the loading on the ringinggenerators. The controls implemented vary among the Series I and Series IIperipherals. A description of the ringing generator load controls implementedin the Series I and Series II peripherals follows.RG overload control - Series I peripheralsSeries I peripherals consist of the line module (LM) and remote line module(RLM). Ringing bus monitors in the LM and RLM monitor the voltage andcurrent on the ringing bus.The ringing bus current monitor reacts when excessive current passes throughthe 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 ringingbus 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 than1.5 seconds (s).When the current or voltage threshold is exceeded, the LM software stopsprocessing any further ringing requests until the current or voltage falls belowthe threshold. Incoming calls during the ringing generator overload state areblocked.