Figure 2.18 Qdasl Block Diagram - Samsung OFFICESERV 7100 Service Manual

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2.5.9.2 Main Features
4DLM is composed of QDASL(TP3404) that provides the keyset interface and QDMC(STI9511)
that controls QDASL like 16DLI2.
QDASL (TP3404)
Quad Digital Adapter for Subscriber Loops(QDASL) creates the AMI code and transmits
the code to typical phones through transformer. Demodulate the AMI code and transmit the
serial data to QDMC. Then, QDMC converts the serial data to parallel data through UART
and transmits the data to CPU.
Quad 2B+1D channel interface
144 kbps full-duplex in one twisted part
Loop range[~ 6kft(#24AWG)]
Alternate Mark Inversion coding(transmit pulse shaping DAC), Smoothing Filter,
scrambler for low EMI radiation
Programmable Time-slot Assignment TDM interface for B channels
BCLK
FS
BI
BO
TSB
DI
DO
CCLK
CS
CO
CI
INT
2-32
TIME-SLOT
ASSIGNER
CONTROL&
STATUS
REGISTERS
GNDO GNDA

Figure 2.18 QDASL Block Diagram

γCCO γCCA NCLK
SCRAVBLER
FRAMER
TX DAC
AMI COOER
FRAVE SYNC
SCRAVBLER
RECEIV.
LINE SIGNAL
DETECT
LINE #0
LINE #1
LINE #2
LINE #3
© SAMSUNG Electronics Co., Ltd.
Lo0
Li0
Lo1
Li1
Lo2
Li2
Lo3
Li3