RAD Data comm ASM-20 Especificaciones Pagina 22

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Chapter 1 Introduction Installation and Operation Manual
1-6 Functional Description ASM-40 Ver. 1.0
XMT
FIFO
RCV
FIFO
XMT
G.703-HDB3
RCV
G.703-HDB3
G.703-HDB3 Interface
Basic ASM-40
Data
and CLK
(Input)
Data
and CLK
(Output)
TX
RX
Internal
External
Data
Data
Receive
Data
Data
EXT
or
HDB
Internal, Receive
TD
RC
RD
TC
EXT CLK
Clock and Data
Clock and Data
PLL
Figure 1-7. G.703-HDB3 Clock Diagram, DTE Interface
TX
Analog Lines
INT
EXT
RCV
RCV
TXFIFO
TX
CLK
Input
CLK
Input
CLK
Output
CLK
Output
CLK
Input
Loopback
Timing on
DTE Side
Loopback
Timing on
DTE Side
TC &
TR
Data CLK
Output
TC & RC
TC & TR
EXT CLK
EXT CLK
TX
RX
RX
RX
RX
FIFO
XMT
FIFO
RCV
FIFO
RCV
FIFO
XMT
FIFO
CLK
Input
Loopback
Timing on
DTE Side
Data CLK
Output
FIFO
XMT
FIFO
Figure 1-8. G.703-HDB3 Clock Configurations, DTE Interface
Encoder/Decoder
The ASM-40 encoder/decoder converts from NRZ to HDB3, AMI or B8ZS on the
transmission side and converts back to NRZ on the receive side.
Line Driver
The line driver provides a three-level alternate mark inversion signal according to
ITU-G.703 standard.
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