Coral Telecom DX2000XL, Руководство по программированию для пользователя

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User & Programming Manual
DX2000 XL – Hotel Version
19
Architecture of the system
The system is designed using advanced CMOS chips to ensure optimum processor speed and
minimum power utilization. It is a micro controller based system with distributed processing.
Each card in the system has a PTC (Positive Temperature Co-efficient) to ensure protection
to the cards and also to act as an auto resettable fuse. Each card in the system is provided
with SMPS to convert 24 volts DC into its own operating and logic voltages. The system has
a combination of active and passive bus to ensure reliable communication between the cards.
For e.g. if one card fails, it does not affect the performance of other cards. The architecture
of the system is as under:
Range
Module DX2000 Small
- 40 Ports
Module DX2000 Medium - 72 Ports
Module DX2000 Large - 120 Ports
Power supply unit (PSU) card
It has distributed power management to ensure minimal load on the PSU. It has an SMPS
design and ensures constant current charging to the batteries connected to the system. It
converts 230 volts AC into various operating voltages.
a. 24 volts DC for power supply to all cards & for line voltage.
b. 60 volts AC, 20 Hz. for ringer voltage for analog telephones.
c. 28 Volt for Battery Charging.
d. +48 Volt DC for Line Voltage (Optional).
Important: It is found that all the DTMF CLI instruments which are available in the market,
does not support the CLI facility if the line voltage is 24 Volt DC. So if CLI on SLT is
required, ensure that the system is configured with a power supply that supports 48 Volt line
voltage.
Cards Description
CPU Card
There are 2 types of CPU cards supported on DX2000 series:
a. CCPU - For maximum 120 Ports
b. SL CPU - For Maximum 504 Ports
CPU controls the complete functioning of the system. CCPU is an Intel 89C51 @ 12 MHz.
micro controller based system. It has 128 KB RAM and 128 KB ROM for systems below
120 lines. XL CPU uses Intel 89C52 micro controller which runs @ 20 MHz.