Lucent Technologies MERLIN LEGEND Release 5.0 System Planning Manual page 195

MERLIN LEGEND Communications System Release 5.0
System Planning 555-650-112
4 Features
System Features
c.
5. Under the Preferred Trunk Pools heading:
a.
b.
NOTE: NOTE: NOTE:
Tables 17 and 18 are explained later.
Figure 4-1
fictitious company, McHale and Associates of Denver, Colorado (area code: 303).
McHale has a local trunk pool, an in-state WATS pool, and a cross-country WATS
pool. Because Colorado has two area codes (303 and 719), the in-state WATS
line/trunk can be used for both toll and local calls. Therefore, there are two entries
for Pool 890 on the worksheet.
The cross-country WATS trunk pool serves the greatest number of different area
codes, every area code in the country except the two in Colorado. Therefore, it is
the preferred trunk pool for toll calls.
The in-state WATS trunk pool serves the greatest number of different exchanges.
It is the preferred trunk pool for calls to every exchange in area code 303, except
the 20 exchanges in the local calling area. Therefore, it is the preferred trunk pool
for local calls and some of these are toll calls.
Enter the total number of different area codes or exchanges that the
pool should serve in the Number of Area Codes or Exchanges for
which Trunk Pool Is Used column.
NOTE:
If you do not know the exact number of exchanges or area codes,
write a note such as All area codes in the U.S. except the 15 served by
the regional WATS lines/trunks. Keep in mind that you are recording
how many different area codes or exchanges the pool should
access, not the area codes or exchanges themselves. This step
helps identify the preferred trunk pools for toll and local calls.
( Preferred pools are the trunk pools in which the system places each
call unless a different route has been specified for that particular type
of call.)
Determine which of the toll trunk pools is used for calls to the
greatest number of different area codes. Write the number of that
trunk pool in the space next to For toll calls (Table 17).
Determine which of the local trunk pools is used for calls to the
greatest number of different exchanges. Write the number of that
trunk pool in the space next to For local calls (Table 18).
shows the completed Automatic Route Selection Worksheet for the
Issue 1
June 1997
Page 4-53