Lucent Technologies MERLIN LEGEND Release 7.0 System Planning Manual page 259

MERLIN LEGEND Communications System Release 7.0
System Planning 555-670-112
4 Features
System Features
c.
5. Under the Preferred Trunk Pools heading:
a.
b.
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 three area codes (303, 719, and 970), the in-state
WATS line/trunk can be used for both toll and local calls.
example of two entries (for the 303 and 719 area codes) 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.
If the local switch will use PSTN lines on a remote switch, see the Network
Reference for the steps necessary to implement this.
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
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). Table 17 is
explained later in this chapter.
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). Table 18 is
explained later in this chapter.
shows the completed Automatic Route Selection Worksheet for the
Issue 1
April 1999
Figure 4-1 shows an
4-61