Figure 4.8 Dli Port Wiring Diagram - Samsung OfficeServ 12 Service Manual

•
Far-End Circuit Part: The far-end circuit part is connected to a digital key phone via
cable and is composed of a power supply circuit, data transfer circuit, and a protection
circuit. A transformer is used in a key phone interface to send AMI signals while
separating the primary and secondary power. The power used for starting a key phone
is supplied through the secondary DLT-1 transformer. Since the far-end circuit is
directly connection to external cables, it needs a protection circuit and device that will
protect the system from external overvoltage and overcurrent. An anti-overvoltage
circuit composed of a resistance in the secondary DLT-1, and a Zener diode is used for
such purpose.
4.2.2.9 Single Line Phone Connection Interface (5SLI, 2HYB)
The base board of the OfficeServ 12 system has five SLI circuits and two HYB(hybrid) circuits,
supporting up to seven analog phones.
Main devices of SLI are configured using QSLAC(Quad Subscriber Line Audio-processing
Circuit) and SLIC(Subscriber Line Interface Circuit).
QSLAC
The characteristics of QSLAC are as follows:
•
Device: Legirity Le58QL02
•
Quantity: 2
•
Power: 3.3 V
•
Package: 44P TQFP
•
u-P Interface: Serial
• Items that can be controlled by program: SLIC Input Impedance
Trans hybrid balance
Tx/Rx gain control
Time slot assigner
A Law/u Law Selectable
•
A single QSLAC can control up to four SLICs.
© SAMSUNG Electronics Co., Ltd.

Figure 4.8 DLI Port Wiring Diagram

L1
L2
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