Nortel Networks i2021 Series manual

i2021 ISDN Teleset

not be lost if memory power is removed from the telephone.

On/Off-Hook - When a Call Appearance LED is lit and the user is listening to dial tone, is communicating, or has an active call on hold. A handset removed from the cradle does not necessarily mean the Teleset is off-hook. The i2021 can be on-hook with the handset removed from the cradle.

Primary Directory Number (PDN) - The telephone number of a particular telephone. Some telephone companies require the PDN to be Key 1. It is recommended that key 1 be the PDN.

“S” Interface - The 4-wire interface between the ISDN telephone and the NT1. In the i2021 it is the same point as the “T” interface.

Shared Call Appearance (SCA) - A Call Appearance that appears on more than one ISDN telephone. Similar to an extension phone in an analog telephone application.

Service Profile IDentifier (SPID) - A code programmed into the telephone

and used by the switch to identify the configuration used by the telephone. The SPID is usually the PDN plus 0101.

“T” Interface -See “S” interface.

TP Packages - A set of translations that the telephone company may offer. The TP packages offer a variety of commonly used features in an easy order package.

Terminal Endpoint Identifier (TEI)- A code used by the telephone to identify it to the switch. The i2021 uses Automatic (Dynamic) TEIs.

“U” Interface - The 2-Wire interface between the NT1 and the telephone company line.

Volatile (memory) - Information which is stored in the telephone which will be lost when power is removed from the Teleset.

68