Samsung OfficeServ 12, Service Manual

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© SAMSUNG Electronics Co., Ltd. 14
4.2.2.6 CPLD
CPLD(Complex Programmable Logic Device) contains most of the startup logics, part of
which serves as data bus. The characteristics of CPLD are as follows:
•
Device: Lattice M4A3-192/96-10 VC
•
Macro Cell Count: 192
•
Quantity: 1
• Power: 3.3 V
• Package: 144P TQFP
4.2.2.7 RTC (Real Time Clock)
OfficeServ 12 is equipped with a clock component(RTC72423) used as a reference for
displaying the clock and call records on the LCD(Liquid Crystal Display). Like the data
memory, this device must be active even during a power failure and can be backed up by
battery. The data memory and clock circuit share a same backup battery.
4.2.2.8 Digital Phone Connection Interface (1DLI, 2HYB)
The base board of OfficeServ 12 provides a single DLI circuit and two HYB(hybrid)
circuits, supporting total three lines for connecting digital phones.
Although theoretically any Samsung digital key phone model can be connected since they
have the same interface and protocol, but in reality, only those that satisfies the system
capacity can be accommodated. Not only key phones but also Door Phone Interface
Modules can be used for a key phone interface.
2B + D Technology
The 2B + D technology has been used for configuring the digital phone interface of
OfficeServ 12, basically supporting 2 voice channels. The data transfer rate between the
main unit and terminals is 192 Kbps, 144 Kbps of which is used for information data and
48 Kbps of which is used for data needed for signal processing and as blank.
Digital Phone Interface Structure
The interface of digital key phones is composed of the DMC(Digital line interface Module
Controller) part, QDSAL(Quad Digital Adaptor for Subscriber Loops) part, and the far-end
circuit part.
•
DMC Part: Located inside the engine(STC9604), the DMC directly controls two
QDASL parts and interfaces with the CPU. The DMC part exchanges data with the
CPU in bytes through the data bus, and interfaces with a QDASL in bits through a
serial communication method. OfficeServ 12 controls a single QDASL.
•
QDASL Part: The QDASL part directly controls a key phone through a far-end circuit.
The QDASL part creates a single serial signal by multiplexing two voice channels(2 x
64 Kbps) and a data channel(16 Kbps). The QDASL part also demultiplexes a serial
signal received from a key phone into two voice channels and a data channel. A single
QDASL controls four ports.