Figure 4.14 2Bri Block Diagram - Samsung OfficeServ 12 Service Manual

4.2.3.2 Digital Trunk Board (2BRI)
The blocks of the 2BRI board are shown in the figure below:
50P Conn.
/ADDRESS
DATA
/INT
/Control
HW(2)
/4M
/FSX
/RST
The 2BRI board provides four-channel ISDN(Integrated Services Digital Network) trunk
interfaces. In addition, the 2'nd BRI interfaces are equipped with connections for a T-mode
or S-mode.
The board has several parts of circuits, i.e., interface with the base board, Analog PLL(Phase
Locked Loop), S/T Interface chips, isolation transformers, and primary interfaces for ISDN
trunk lines. The 2BRI board has one connector, two RJ-45 modular jacks,
DIN connector for connecting to the base board.
the external connections to ISDN lines.
Features
•
Full duplex 2B + D S/T interface transceiver according to CCITT(Consultative
Committee on International Telegraphy and Telephony) I.430
•
Conversion of the frame structure between the S/T interface and IOM(ISDN Oriented
Modular)
•
Receive timing recovery according to selected operating mode
•
D-channel access
•
Activation and deactivation procedures, with automatic wake-up from power-down
state
© SAMSUNG Electronics Co., Ltd.
CPLD
PLL
OSC
7.680 MHz

Figure 4.14 2BRI Block Diagram

S/T I/F Chip Trans
(PEB3086) APT-2SO-22B
Trans
S/T I/F Chip
APT-2SO-22B
(PEB3086)
wo RJ-45 modular jack connectors
T
BRI#1 T
RJ45
BRI#2 S/T
RJ45
one 50-pin
and
for
are
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