Lucent Technologies MERLIN LEGEND Release 6.0 Network Reference Manual page 125

MERLIN LEGEND Communications System Release 6.0
Network Reference 555-660-150
2 Call-Handling Scenarios
Network Configuration Scenarios
Note the following general facts about this larger network, which requires more
coordination in order to set up:
The systems span three different time zones.
System H serves a warehousing and shipping operational facility. It has
one loop-start line connected to the PSTN for emergency and power-failure
backup purposes. For all other outside calls, System H uses PSTN
facilities that are connected to other systems in the network. It is located
relatively near System E, but not in the same area code.
System H is served by the auto attendant system of the hub, System E.
System G is a small branch office that has fewer extensions and requires
fewer PSTN facilities than the larger Systems E and F.
The system manager at System E is the coordinating system manager for
the network. Any changes at local systems are cleared through this person,
who ensures that the changes do not interfere with network operations. If
changes at one system require changes at other systems as well, the
System E manager sees that the proper modifications are made and that
system forms are updated accordingly.
To avoid conflicts, the dial plan of each system is unique within the
network.
All systems have videoconferencing applications and use them for
meetings. They also use other high-speed data applications.
Two systems, located on opposite coasts, have PassageWay Telephony
Services applications for use by telemarketers.
Not all dial plan entries are necessarily shown for each system.
The PRI to PSTN circuit to System E is fractional. The DS1 module is
installed in the last slot of the control unit, therefore only the first four ports
are counted toward the system maximum of 80. However, the D channel
will still function.
Non-Local Dial Plans and Facilities Planning
This section explains how non-local dial plans, switch identifiers, UDP routing,
ARS routing, and remote access are set up for each system. Not all details are
provided for all facilities and extensions.
Intersystem calling is not illustrated in detail for Scenario 4, but
2–68 shows the applicable extension ranges, patterns, and primary routes for
tandem and PSTN facility pools when people in one system call people at non-
local dial plan extensions. Some UDP routes are reserved for high-speed
data/video calls between systems, and a pair of extension numbers (5610–5611)
on the headquarters System E is dedicated to executive videoconferences. When
considering intersystem calling, keep the following facts in mind:
2
Table 2–19, page
Issue 1
February 1998
Page 2-65