Lucent Technologies MERLIN LEGEND Release 6.0 Network Reference Manual page 68

MERLIN LEGEND Communications System Release 6.0
Network Reference 555-660-150
2 Call-Handling Scenarios
Networking Guidelines
Programming Regular Remote Access
For explicit remote access use by local system users (or by non-local users for
special maintenance purposes, for example), assign PSTN trunks to remote
access as you normally would, or use PRI dial-plan routed or DID trunks. Specify
that users must enter barrier codes for remote access. Do not assign tandem
trunks as dedicated or shared remote-access facilities.
Tandem Trunks
As Chapter 1, "Introduction," explains, tandem trunks may be either PRI or tie
facilities.
explains the advantages of PRI tandem trunks, which provide enhanced features
and performance over tie trunks. Tandem T1-emulated tie trunks provide faster
call setup and greater data speeds than analog tie trunks, although they do not
provide the full functionality of PRI. Analog tandem tie trunks may be required in
some networks where the systems cannot support additional PRI or T1 facilities
and remain within the 80-line capacity of a MERLIN LEGEND Communications
System. For examples, see
Series, Mixed Facilities" on page 2–50
Mixed Facilities" on page
System managers must assign switch identifiers to designate, for each networked
trunk, the system connected to the other end of that trunk. The identifiers serve
several purposes for example, they assure the proper volume levels on private
network trunks and allow the proper routing for calls across the network. For
example, if System A is connected to System B by a tandem trunk, the System A
manager programs that trunk with the switch identifier for System B, the system at
the other end of the tandem trunk. Similarly, the System B manager programs the
same trunk with the switch identifier for System A.
The number range of a switch identifier also designates the type of system
connected at the other end of a tandem trunk. A MERLIN LEGEND
Communications System is always identified by a number between 1 and 40,
whereas DEFINITY ECS and DEFINITY ProLogix Solutions systems are
identified by numbers between 41 and 60.
measures. When a Remote Access code is included in the non-local
dial plan of the calling system, the caller's barrier code FRL on the
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.
"Scenario 1: Two Systems, Tandem PRI Facilities" on page 2–14
"Scenario 3: Four Systems in a
2–63.
Table 4–1, page 4–3
2
2
and "Scenario 4: Four Systems in a Star,
Issue 1
February 1998
Page 2-8
"Remote Access
for details.
explains the operation of