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 66 page image

2-8 Ringing in Series I peripherals297-1001-131 Standard 06.01 October 2000If operating company personnel repair the RGI fault and return the unit toservice, the DMS-100 CC, upon seeing that the RGI is now in-service, issuesa take back command to the LM or RLM controller. In response, the LM orRLM controller disconnects the bay 0 RGI link to the bay 1 ringing generatorover the crossover link and reconnects it to the other ringing generator in itsown bay. It then reconnects the RGI links in bay 1 to the ringing generators inbay 1. This resumes the normal configuration as illustrated in Figure 2-3,"Normal ringing configuration in LM/RLM" on page 2-5.Some calls in the ringing state during take back are switched to the otherringing generator. Because the LM or RLM ringing generators are notsynchronized, this can result in noticeable discontinuity in the ringing cadencefor ringing lines switched to the other ringing generator. The following figureillustrates a possible result of switching ringing generators on a ringing line.Figure 2-5 Switching ringing generators - possible effect on ringing linesRinging generator capacityThe LM and RLM software limits the number of lines the ringing generatorcan ring simultaneously to 15 lines. When a ringing request is received, theLM and RLM software examines the next 12 time slots and determines theappropriate time slots of the ringing cycle for the schedule ringing request. Itthen checks the number of lines the ringing generator is currently servicingduring those time slots to determine if the new request can be added withoutexceeding the 15-line limit.If the limit is reached, the LM and RLM software will queue the ringingrequest for up to two seconds. If the request can not be scheduled within thetwo-second queueing period, the call is blocked and the called party is routedto the treatment facility and receives the fast busy (T120) tone. An associatedlog report is output at the DMS-100.Switch from RG 0 toRG 1 at this pointResultingringRG 1RG 0