AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 95

Trunks
Type of DID Trunks
Expected Digits
Delete Digits
3-40 Trunk Options
The choices for the type of DID trunk are immediate-start and wink-start (the
factory setting). If the local telephone company can support wink-start, keep the
factory setting because it allows a greater probability of call completion during
heavy calling periods. However, if the local telephone company can support
only immediate-start, you must change the factory setting.
Planning Form Instructions
On Form 3e, under the "Type" heading:
1 . Check "Wink-start" to keep the factory setting.
2 . Check "Immediate-start" to change it.
The system is capable of receiving from one to four digits from the local
telephone company. The factory setting is three digits. Check with the local
telephone company to determine the number of digits sent.
Planning Form Instructions
On Form 3e, under the "Expected Digits" heading:
1 . Check "3" to show that the telephone company sends the factory-set
number of digits.
2 . Check "1," "2," or "4" to show the number of digits sent by the telephone
company.
Compare the number of digits sent by the local telephone company to the
number of digits in your system numbering plan. If the number of digits sent by
the local telephone company is more than the number of digits in your system
numbering plan, specify that one to four digits be deleted from the digits sent.
This is needed to route the call to the extension numbers in your system.
For example, the local telephone company sends four digits numbered from
1500 to 1650. Your numbering plan includes extension numbers from 500 to
650. You can specify that one digit be deleted.
Keep the factory setting of zero digits if the number of digits sent matches your
system numbering plan.
Planning Form Instructions
On Form 3e, under "Delete Digits" heading:
1.
Check "0" if your numbering plan matches the number of digits sent by
the telephone company.
2 . Check the number of digits that must be deleted from the telephone
number sent by the telephone company (1, 2, 3, or 4).