PRELIMINARY
NEC confidential and Proprietary
37
CHAPTER 3 FUNCTIONAL OUTLINE
The
µ
PD98413 is a quad STS-12/STM-4 framer device. The major functions are to map the ATM cells/POS (PPP
over SONET) packets received from the ATM/POS device into the SONET/SDH frame and output the ATM cells/POS
packets to the line, or to receive the ATM cells/packets from a receive SONET/SDH frame and output the ATM cells/
packets to the ATM/POS device. The mode of the
µ
PD98413 is set, commands are issued to the
µ
PD98413, and its
status registers are polled via the management interface.
Figure 3-1.
µµµµ
PD98413 and Peripheral Blocks
OSC
77.76 or
19.44 MHz
ATM/POS
switch
element
µ
PD98413
NEASCOT-P65
UTOPIA/POS
interface
Alarm
Management interface
Fiber Transceiver
UTP Transceiver
Port 0
Transceiver
&
Receiver
Line interface
Management
element
Line interface card
Switch control module
Port 1
Transceiver
&
Receiver
Port 2
Transceiver
&
Receiver
Port 3
Transceiver
&
Receiver
Figure 3-2. Transmit/Receive Data Flow of
µµµµ
PD98413
622.08 STS-12c/STM4 frame
µ
PD98413
ATM cell / Packet
Overhead
Port 0 framer
Port 1 framer
Port 2 framer
Port 3 framer
A
T
M/
PO
S i
n
te
rf
a
c
e
Cell
Cell
Tx
Rx
Summary of Contents for NEASCOT-P65
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