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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Call-Handling Scenarios
Page 2-88Network Configuration Scenarios
2
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.