Nortel Networks i2021 Series - Manual (Page 73)

i2021 ISDN Teleset
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GLOSSARY
The definitions in this Glossary refer to the i2021 Teleset only.
Bearer Service - also known as Bearer Capability. The type of service that
can be accessed on the “B” channel. Typical Bearer Services are
voice, data, and audio,
Call Appearance (CA) - A hardkey on the Teleset that is programmed for
voice communication. A CA may have a unique Directory Number, or
it may be the same telephone number that appears on other keys or
other Telesets.
Call Appearance Call Handling (CACH) - Pronounced “cash”- Refers to a
translation in the Central Office switch. CACH is the recommended
setting for the i2021.
Customer Premises Equipment (CPE) - Devices residing at or on the
customers’ premises. The i2021 Teleset is CPE.
CENTREX - A business telephone service offered by the local telephone
company. CENTREX offers many Electronic Key Telephone features
to enhance the operation of the i2021.
Directory Number (DN) - Also known as a telephone number.
Electronic Key Telephone Service (EKTS) - A feature that allows the
Teleset to have Multiple Call Appearances (MCA) and Shared Call
Appearances (SCA).
Feature Activator/Indicator - A softkey or a programmable hardkey used to
access a specific switch feature, i.e., Conference, Drop, Transfer, Call
Forward, Call Park, Inspect, etc.
ISDN Ordering Code (IOC) - This is a code supplied by a terminal
manufacturer to be used by the telephone company in provisioning the
ISDN service. (See TP Packages)
Multiple Call Appearance (MCA) - Additional Call Appearances of the
same Directory Number.
Network Termination 1 (NT1) - A piece of CPE required to interface “S”
interface devices with the “U” interface from the telephone company.
Non-Volatile (memory) - Information that is stored in the telephone that will