Lucent Technologies MERLIN LEGEND Release 6.0 Network Reference Manual page 127

MERLIN LEGEND Communications System Release 6.0
Network Reference 555-660-150
2 Call-Handling Scenarios
Network Configuration Scenarios
!
The hub system, System E, can support only two tandem PRI trunks to
connect to Systems H and F, because it also requires a number of outside
facilities. It is using the maximum system capacity of 80 lines/trunks. Its
800 DID module is in the last circuit module position in the control unit and
uses only 4 lines of its 8-line capacity. There is no emergency loop-start
line connected to the system, but there is a loop-start line off the system in
case of power failure. Compare the limitations with those of Scenario 3,
shown in
Using tandem PRI trunks, an additional system could be connected to
either System F or System H. Were an additional system connected to
System G, its features and performance would be limited by the tandem tie
trunks that link System G to the network.
Default remote access COR settings are not shown. As in earlier
scenarios, the system managers require barrier codes for remote access
calls via PSTN facilities and those dialed as intersystem calls using a
Remote Access code; this requirement is ignored for ARS routing across
the network. Instead, the default COR FRL is compared to the UDP or ARS
route before a call leaves the local system to reach another network
system or the PSTN.
A detailed table of ARS routing is not shown; this has been described in
earlier scenarios. The ARS access code for all systems is 9.
CAUTION:
Unless networked systems are collocated, 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 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, IXC calls determine the number of loop-starts
required. Refer to Feature Reference guide for details on the PFT
feature.
Figure 2–4 on page 2–51.
Issue 1
February 1998
Page 2-67