Lucent Technologies 555-661-150 manual Scenario 5 Large System Hub

MERLIN LEGEND Communications System Release 6.1		Issue 1
Network Reference 555-661-150		August 1998
2 Call-Handling Scenarios
	Network Configuration Scenarios	Page 2-88
	Scenario 5: Large System Hub	2

In this scenario, two MERLIN LEGEND Communications Systems are linked to a hub DEFINITY ECS or DEFINITY ProLogix Solutions system in a star configuration. Rather than repeating points made in earlier scenarios, this section concentrates on the unique features of the Scenario 5 configuration. Figure 2–6 on page 2–89 shows how the system is arranged.

NOTE:

DEFINITY ECS or DEFINITY ProLogix Solutions features and operations are beyond the scope of this guide. This scenario discusses the private network from the MERLIN LEGEND Communications Systems’ perspective.

Note the following general facts about this private network:

■The systems are located in two different time zones.

■Only tandem PRI facilities connect the systems.

■The configuration takes advantage of the greater line/trunk capacity of the hub system. Systems O and N primarily use outside PSTN facilities connected to System A (DEFINITY ECS or DEFINITY ProLogix Solutions).

■The system manager at System O is the coordinating system manager for the private network. Any changes at local systems are cleared through this person, who ensures that the changes do not interfere with private network operations. If changes at one system require changes at other systems as well, the System O manager sees that the proper modifications are made and that system forms are updated accordingly.

■Systems O and A are located on the same corporate campus. System O serves the corporation’s data processing and back office operations and transfers data to and from the System A headquarters system.

■Because System O is located in the same building as System A, all its calls are routed via the private network. The System O loop-start line is used only in the event of a power failure. The tandem PRI trunks are assigned to System O’s main pool. When a Special Numbers call is made, the system automatically prepends the ARS access code of System A. Emergency 911 and information 411 calls can reach the correct local services.

!CAUTION:

Unless networked systems are co-located, each system should have at least one loop-start line connected to the PSTN. The line is required to allow connection of a power-failure telephone to the Power-Failure Transfer (PFT) jack on a module as a power outage backup and for correct routing of emergency and other N11 (911, 411, etc.) calls. To ensure that the correct services are reached, if the loop-start line is used for emergency or other N11 calls, it should be assigned to the main pool. In this case, inter-exchange (IXC) calls determine the number of loop-starts required. Refer to Feature Reference guide for details on the PFT feature.