Specifications
72 Digital Key Bx, Digital 400 & Digital 1000 System Description
The DIGITAL systems' modular hardware and flexible
software enable every installation to be tailored precisely
to meet the customer's needs. The system is extremely
versatile: it can be configured as a PBX, as a hybrid
PBX/key telephone system (KTS), or as a squared
KTS.
TECHNOLOGY
The DIGITAL systems use Space and Time Division
Multiplexing (S/TDM) and Pulse Code Modulation
(PCM). Distributed control is achieved through the
microcontrollers located on each peripheral card.
System cards are built for sophistication and economy
using Surface Mount Technology (SMT).
The incorporation of the ISDN (physical layer) passive
bus (2B+D S-interface) into the DIGITAL systems
architecture enables the running of data and additional
applications as described in Section 4, and the flexible
assignment of one or two stations on a bus. Using
Avanti 3025, Avanti 3020F, Avanti 3020H, Avanti
3015DF, or Avanti 3015DF sets, offhook voice
announce with handsfree answerback can be configured
for all of the extensions in the system, with no reduction
in system capacity or performance.
SYSTEM EQUIPMENT
DIGITAL KEY BX and DIGITAL 400
The DIGITAL KEY BX and DIGITAL 400 systems'
equipment consists of up to three modular cabinets
with a power supply in each cabinet. The system power
supply unit(s) can be supported by an external Battery
Backup Unit (BBU) or Uninterruptible Power Supply
(UPS), to provide service during power outages.
DIGITAL 1000
The DIGITAL 1000 systemís equipment consists of
up to four modular card cabinets. The direct current is
provided by individual power rectifiers in each cabinet
(SREC) or the cabinets can be connected to an external
48 Vdc power source.
Each card cabinet requires a Switching Power Converter
(SPC), which switches the 48 dc voltage output of the
rectifiers or of the external 48 Vdc power source to the
various voltages required by the DIGITAL 1000
system.
An external Battery Backup Unit (BBU) or
Uninterruptible Power Supply (UPS) can provide
service during power outages.
In addition, in multiple-cabinet systems, the DIGITAL
1000 system has a Driver (DRV) card in each card
cabinet, for communication among the cabinets.
Peripheral equipment includes Telrad's new digital
Avanti sets, the Avanti DSS Add-on module, Telrads
APPLync and DATALync data cards, the Voice
Recognition Card option, the PC attendant, Telrad's
DIGITAL sets, industry standard SLTs, Telrad Analog
sets, announcers, and ImaGEN - Telrad's Integrated
Multi-application Generator with voice mail/automated
attendant as well as other optional applications.
SYSTEM CABINETS
Each DIGITAL KEY BX system cabinet (see Figure
32) can be wall-mounted and contains up to six printed
circuit card slots as well as its own power supply unit.
The Main Processor card (MPD) must be inserted into
the first slot of the first cabinet. All other cards may