Network Configuration Scenarios - Lucent Technologies MERLIN LEGEND Release 6.0 Network Reference Manual

MERLIN LEGEND Communications System Release 6.0
Network Reference 555-660-150
2 Call-Handling Scenarios

Network Configuration Scenarios

Chapter 4, "Security," explains FRLs and how they affect routing in more
detail.
Network Configuration Scenarios
In this topic, the networking scenarios are distinguished by the types of facilities
that connect the systems, geographic locations of the systems, the PSTN facilities
connected to each system, the arrangement of the systems in a series or in a star,
and the number of systems included in the network. The following examples are
discussed:
Scenario 1: Two Systems, Tandem PRI Facilities,
example, two MERLIN LEGEND Communications Systems are linked in a
private network using PRI tandem trunks only. This is a series
configuration . The systems are located in different area codes, and each
has public-switched network trunks connected to its local system. Tandem
PRI trunks provide greater functionality in private networks than do tandem
tie trunks.
Scenario 2: Two Systems, Tandem Tie Facilities,
example, two MERLIN LEGEND Communications Systems are linked in a
private network using tandem tie trunks only. This is also a series
configuration. The systems are located in different area codes, and each
has public-switched network trunks connected locally. To show how
networks work in a business environment, this scenario provides more
details about real-world organizational needs and overall feature planning.
This scenario also illustrates the way systems work when they are
connected by tandem tie trunks only.
Scenario 3: Four Systems in a Series, Tandem PRI Facilities,
2–50. In this scenario, there is no hub system. Instead the systems are
connected in a linear fashion. Three systems are joined by tandem PRI
facilities. A fourth system is connected to one of the others by tandem tie
trunks.
Scenario 4: Four Systems in a Star, Mixed Facilities,
scenario, one system acts as the hub and has public-switched network
trunks connected to its control unit, as do two other systems connected in a
star configuration to the hub. The fourth system has only emergency PSTN
called system is compared to the UDP or ARS route FRL on the
called system. See the Feature Reference and
Default Class-of-Restriction Settings" on page 4–6
Extension and ARS FRLs should be carefully and stringently
assigned in order to prevent unauthorized trunk-to-trunk transfers to
local PSTN facilities.
this feature in a networked system.
Table 4–1, page 4–3
2
Issue 1
February 1998
Page 2-12
"Remote Access
for details.
explains the operation of
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