NEC DS1000 Product Description page 151

Distinctive Ringing
Do Not Disturb
Do Not Disturb Override
Door Box
DSTU
Expanded Database
Expansion Board
Extended Ringing
DS1000/2000 Product Description
Keyset users can customize their telephone's ringing.
Reference: Distinctive Ringing on page 56.
Blocks incoming calls, Off-Hook Signaling, and Paging announcements
at an extension.
Do Not Disturb on page 57.
Reference:
An extension user can easily override a co-worker's Do Not Disturb.
Reference: Do Not Disturb Override on page 59.
A unique station instrument, typically placed next to an entrance door,
that allows visitors at the door to communicate with selected internal
extensions. The Door Box works like a door bell with an integral speaker
and microphone.
Door Box on page 59.
Reference:
Digital Station Port.
16DSTU Digital Station PCB (P/N 80021A) on page 11 and
Reference:
DS1000 Cabinet (P/N 80200A) on page 13.
New database method that provides for advanced features like IntraMail
and DS2000 Automatic Slot Configuration.
Reference: Expanded Database on page 60.
Expands the capabilities of the DS1000 system.
Reference: DS1000 Expansion Board (P/N 80221) on page 14.
Allows calls to ring specific extensions (such as warehouse telephones)
for an extended number of rings before the calls follow the system's nor-
mal rerouting procedures.
Extended Ringing on page 60.
Reference:
Glossary
Section 5: Glossary N 141
5