參數(shù)資料
型號(hào)： S3045
廠商： APPLIEDMICRO INC
元件分類： 數(shù)字傳輸電路
英文描述： SONET/SDH OC-12 to OC-48 Mux/Demux(SONET/SDH多路轉(zhuǎn)換器/多路分解器)
中文描述： MUX/DEMUX, PQFP208
封裝： TEP-208
文件頁數(shù)： 8/30頁
文件大?。?/td> 699K
代理商： S3045
8
S3045
SONET/SDH OC-12 TO OC-48 MUX/DEMUX
March 12, 2001 / Revision F
FRAMER (In-frame, going out-of-frame)
The frame acquisition algorithm determines whether
the receiver is in-frame or out-of-frame. In-frame is
defined as the state where the frame boundaries are
known. Out-of-Frame (OOF) is defined as the state
where the frame boundaries of the incoming signal
are unknown. OOF is also referred to as the Se-
verely Errored Frame (SEF) in the SONET
standards. The frame pulse (FRAME) input of the
S3045 indicates if the frame boundaries are known
(in-frame) or unknown (out-of frame).
An Out-of-Frame (OOF) also known as an SEF con-
dition on an STS-48/STM-16 signal will be declared
when a minimum of four consecutive errored framing
patterns have been received. The maximum SEF de-
tection time will be 625
μ
s for a random signal. The
framing algorithm used to check the alignment is
such that 10
-3
BER does not cause an SEF more
than once every 6 minutes. This algorithm examines
the 48th A1 (F6h) byte and the first four bits of the
first A2 (28h) byte for a total of 12 bits to guarantee
this requirement.
When in an SEF condition the S3045 will assume
the frame has been recovered and declare an in-
frame condition on detecting two successive error-
free framing patterns. This implementation of the
frame recovery circuit achieves realignment follow-
ing a declared SEF within 250
μ
s.
Figure 5. OOF State Machine
Loss of Signal (LOS)
The Loss of Signal (LOS) block monitors the incom-
ing data stream for all zero’s. When a minimum of 27
μ
sec of all zero’s are detected, a loss of signal (LOS)
is declared (high signal). LOS is deactivated (low
signal) when two consecutive valid framing patterns
are detected and no LOS condition is detected in
between. LOS is updated on the falling edge of
POCLKA,B,C,D.
J0 Frame Pulse
The J0 Frame Pulse output will be active high when
the J0 byte is presented on the POUT[7:0]A data
bus. Figure 6 depicts the functional timing of this
signal.
FP Frame Pulse
The FP output indicates frame boundaries in the in-
coming data stream. FP pulses high for one POCLK
cycle when the third A2 byte of the framing se-
quence is valid on the POUT[7:0]A data bus. Figure
7 depicts the functional timing of this signal.
STS-48/STM-16 Byte Interleave Demux
The byte interleave demux shown in Figure 2 con-
verts the byte wide STS-48/STM-16 data stream into
four byte wide STS-12/STM-4 data streams. The
data is byte de-interleaved using four bytes at a
time. The data is output with a 77.76 MHz clock.
NORMAL STATE
OOF (SEF)
STATE
2 consecutive error free
framing patterns
Reset
4 consecutive errored framing patterns
相關(guān)PDF資料
PDF描述
S3050 Multi-Rate SONET/SDH Clock Recovery Unit(多速率SONET/SDH時(shí)鐘恢復(fù)單元)
S3051 2.5 Gbps Limiting Amplifier(用于光纖接收的高增益寬帶寬的2.5 Gbps限幅放大器)
S3055 SONET/SDH/ATM OC-48 16 Bit Transceiver with CDR(SONET/SDH 帶CDR的16位收發(fā)器（完全集成OC-48接口器件）)
S3056 Multi-Rate SONET/SDH Clock Recovery Unit(多速率SONET/SDH時(shí)鐘恢復(fù)單元)
S3057 Multi-Rate SONET/SDH/ATM Transceiver(帶片上鎖相環(huán)的多速率SONET/SDH/ATM收發(fā)器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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