Subpatterns - AT&T MERLIN LEGEND Release 3.1 System Planning Manual

System Features

Subpatterns

For each table (1 through 16, and factory-set Tables 17 and 18), you can select
two subpatterns (A and B) that specify routes to be used at different times. You
can specify up to six routes for each subpattern. For example, you may want
calls to certain area codes routed over WATS lines/trunks during the day; after
11 p.m., when toll rates are less expensive on basic lines/trunks, you may want
the calls routed over the main pool.
For each of the 12 routes (six for each subpattern), you can specify a Facility
Restriction Level (FRL). The FRL is used to refine the route selection process
still further. Each route is assigned an FRL from 0 through 6 (6 is the most
restricted). Each telephone is also assigned an FRL from 0 through 6 (0 is the
most restricted). Callers (extension or remote access barrier code/trunk) can
use the route only if their FRL is equal to or greater than that specified for the
route. You assign a value of 0 to the route if you want all users to access the
route, or 1 through 6 to restrict calling for the route to specific users only.
The form for a typical Area Code Table, illustrated in Figure 4 4, shows a table
to route calls to the 13 area codes served by the northeastern (band 1) WATS
lines beginning at 8 a.m. with no restrictions. The number of the northeastern
WATS pool, 891, is on the first line in the Subpattern A section. The time, 8:00
a.m., is in the Time of Day space, and an FRL of 0 indicates no restrictions. The
11 p.m. in the Time of Day space for Subpattern B and Pool 70 in the Pool
column indicates that calls to these area codes are to be routed over the main
pool after 11 p.m.
Planning Form Instructions
In the Subpattern sections on Form 3f and Form 3g:
1. To direct calls differently according to time of day, write a starting time for
each subpattern in the Time of Day space (for example, 8 a.m.).
2. To complete the Pool column for each subpattern, write the number of the
preferred trunk pool next to the number 1. This is the pool to which calls
to the area codes or exchanges listed in the Area Code/Exchanges
section of this form should be directed.
If you want to designate a backup pool in case all the lines/trunks in the
first choice pool are busy, write the number of the backup trunk pool next
to the number 2, and so on.
3. To complete the FRL column, enter a value of 0 through 6. Assign a value
of 0 if you want all users to access the route, or 1 through 6 to restrict
calling for the route to specific users only. For all except the Default Local
Table, the factory setting is 3. The Default Local Table factory setting is 2.
4–55
Features