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參數(shù)資料
| 型號： | TMUX03155 |
| 廠商： | Lineage Power |
| 英文描述： | STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer(STS-3/STM-1 (AU-4)多路復(fù)用器/多路分解器) |
| 中文描述： | STS-3/STM-1（非盟- 4）多路復(fù)用器/多路解復(fù)用器（STS-3/STM-1（非盟- 4）多路復(fù)用器/多路分解器） |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 261K |
| 代理商： | TMUX03155 |
Product Brief
February 1998
TMUX03155 STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer
8
Lucent Technologies Inc.
Receive Direction Overview
(continued)
STS-3/STM-1 (AU-4) Framing
(continued)
The device will be considered in the loss-of-frame state
(LOF) when an OOF condition persists for
24
consecu-
tive frames (3 ms). The device will transition out of the
LOF state after receiving
24
consecutive frames with
the correct framing patterns spaced 125
μ
s apart and
the OOF condition is clear.
Loss of Signal
Before data is descrambled, the device will detect a
loss-of-signal condition by monitoring a unique input
signal pin or detecting a continuous all-zeros/ones pat-
tern. The device will report this condition to the micro-
processor interface.
Loopback Select Logic
The device can be configured to loopback the transmit
STS-3/STM-1 (AU-4) or accept the local STS-3/STM-1
(AU-4) signal.
STS-3/STM-1 (AU-4) Frame Synchronous
Descrambling
The device will descramble the received SONET/SDH
data (minus the first row of SOH) according to the
frame synchronous descrambling polynomial;
specifically, f(x) = 1 + x
6
+ x
7
. Frame descrambling can
be disabled under software control.
TOAC Drop
This channel drops all of the transport overhead bytes
from the STS-3/STM-1 (AU-4) signal.
B1, B2, and B3 Checking
The device will monitor the incoming B1, B2, and B3
values for errors. These counters will either count bit or
block errors.
Monitoring Functions
The following transport overhead and path overhead
bytes are monitored for failures or changes in states
((J0, Z0-2, Z0-3, F1, K1K2 (APS bytes), S1, M1),
(J1,C2, G1, F2, H4, Z3, Z5)). The bit error rate of the
incoming STS-3/STM-1 (AU-4) signal is calculated to
create
signal fail
and
signal degrade
indicators.
Pointer Interpretation
The device will evaluate the current pointer state for the
normal state, Path AIS (PAIS) state, or loss of pointer
(LOP) conditions, as well as pointer increments and
decrements.
This state machine implements the
pointer interpretation algorithm described in ETS
300 417-1-1: January 1996 - Annex B.
Data Demultiplex and Conversion
The device will demultiplex the STS-3/STM-1 (AU-4)
signal into three STS-1/AU-3 signals, respectively. In
the AU-4 mode, a conversion between the AU-4 pay-
load format and the AU-3 payload format is performed;
this requires the location of the J1 byte to be known. In
the STS-3 mode, the high-speed signal is byte-demulti-
plexed and no format conversion occurs.
STS-1/AU-3 Output Byte Control
The output overhead bytes are controlled in one of four
ways:
1.
2.
Errors can be inserted,
Values from the high-speed STS-3/STM-1 signal
can be copied or set to the byte default,
3.
Values can be inserted under software control, or
4.
Values can be inserted under hardware control.
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