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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)： | 4/12頁 |
| 文件大?。?/td> | 261K |
| 代理商： | TMUX03155 |
Product Brief
February 1998
TMUX03155 STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer
4
Lucent Technologies Inc.
Transmit Direction Overview
(continued)
STS-1/AU-3 Inputs
The SONET/SDH STS-1/AU-3 frame is comprised of
9 rows x 90 columns that repeat at an 8 kHz rate. Each
column is 1-byte wide. The frame contains three col-
umns of transport overhead, one column of path over-
head, and 86 columns of payload. For column byte
definitions, see Table 3 below.
The 27 bytes of transport overhead from each STS-1/
AU-3 input must be aligned*
all be coincident from all three STS-1/AU-3 inputs)
and are allocated as shown below
(A1-1, A1-2, A1-3 must
.
* Can be provided by the TMPR28051 mapper device.
Monitored in STS-1 mode.
Monitored in AU-4 mode.
Note: X = don’t care (payload).
The path overhead (POH) can start anywhere within
the SPE and cannot be accessed in the STS-3 mode.
In the AU-4 mode, the pointer is fixed at 522\D; there-
fore, the J1 byte will always be in row 1, column 4. The
H4 byte is the only valid byte in the POH and all other
bytes are ignored.
Out-of-Frame (OOF) and Loss-of-Frame
(LOF) Monitoring
The device monitors for out-of-frame (OOF) and loss-
of-frame (LOF) states on each selected STS-1/AU-3
input. Each input will be considered out-of-frame until
two
successive framing patterns (0xF628) separated in
time by 125
μ
s occur without framing byte errors. Each
selected STS-1/AU-3 input will be considered in frame
until
arated in time by 125
terns. The device will be considered in the LOF state
when an OOF condition persists for
frames (3 ms), or clear when the OOF condition is inac-
tive for
24
consecutive frames (3 ms) with the correct
framing patterns spaced 125
five
(SDH)/
four
(SONET) successive frames sep-
μ
s occur with errored framing pat-
24
consecutive
μ
s apart.
Descramble Enable/Disable
Each selected STS-1/AU-3 input can be descrambled
according to the frame synchronous descrambling
sequence 1 + x
+ x
. Writing a logic 1 to the appropri-
ate bit causes the selected STS-1/AU-3 signal to be
descrambled.
6
7
Monitor B1 and B2 Errors
The device verifies B1 and B2 bit interleaved parity
(BIP) values on each selected STS-1/AU-3 input. The
device will count BIP errors or block errors under soft-
ware control.
H4 Multiframe and Pointer Monitor (AU-4
Mode Only)
In this mode, all three input signals are required to have
pointer values (H1, H2) with the same fixed value of
522\D. This ensures the J1 byte starts in row 1, column
4. The H4[1:0] multiframe bits must be the same from
all inputs and equal to the internally expected value.
This is required because the output STM-1 (AU-4) sig-
nal only has one H4 byte. The device will synchronize
its H4 internal expected value to a 1 after detecting an
embedded 2 kHz sync in the local frame sync signal.
Table 3. Expected STS-1/AU-3 Input Frame Format
Transport Overhead
Payload
Col 1
Col 2
Col 3
Col 4
Col 5—90
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
Row 7
Row 8
Row 9
A1
B1
D1
H1
B2
D4
D7
D10
S1
A2
E1
D2
H2
K1
D5
D8
D11
M0
J0
F1
D3
H3
K2
D6
D9
D12
E2
J1
B3
C2
G1
F2
H4
Z3
Z4
Z5
X
X
X
X
X
X
X
X
X
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