Glossary

Appendix A

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DSL filter: DSL filters filter out the high-frequency data signals that carry high- speed data to computers. Any of system lines 2 through 4 that carry Digital Subscriber Line (DSL) service need DSL filters installed in the telephone line jacks to improve voice call quality and caller ID reception. You cannot use DSL filters on system Line 1 because it carries data to all the system phones.

DSL splitter: A DSL splitter separates the high-frequency signals for the DSL modem from the low-frequency voice signals going to a System Line. System Line 1, if it carries DSL service, needs a DSL splitter. Using a splitter, rather than a filter, for Line 1 allows the system data to be carried among the system sets. Most splitters must be installed by the telephone company. However, some are installed

by the customer. If you are not sure what type of splitter to use, contact your service provider.

DTAD: The Digital Telephone Answering Device is a sophisticated, tapeless answering system built into the 1080 telephone. In some installations, messages for your phone can be recorded on a 1080 in your system.

Home area code: This is the area code for your telephone number. Users simply dial the seven digits of a telephone number to make a call within their own area code and 11 digits outside of their area code. If this applies to you, you should enter your own area code into the telephone as the home area code. After setting, if you receive a call from within your home area code, the screen will display the last seven digits of the telephone number.

You may, however, live in a region where for calls within your own area code, you must dial 10 digits (that is, the area code and telephone number). If this applies to you, enter 000 for the home area code and enter your area code as a local area code. After setting, if you receive a call from within your area code, the screen displays the 10 digits of the telephone number.

For details, see the Area codes section (page 42).

Line group: A group of system telephones sharing some lines within a multi- telephone system.

Local area code: Most users dial 11 digits to make calls outside their home area codes. If this applies to you, you do not need to program any local area codes.

However, if you dial only 10 digits to make calls to some areas outside your home area code (without dialing 1), then set these local area codes on the telephone. Up to five local area codes can be set. For details, see the Area codes section (page 42). After setting, if you receive a call from one of these local area codes, the screen displays the 10 digits of the telephone number.

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