參數(shù)資料
型號: TMUX03155
英文描述: TMUX03155 STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer
中文描述: TMUX03155 STS-3/STM-1(非盟- 4)復(fù)用器/解復(fù)用器
文件頁數(shù): 18/120頁
文件大?。?/td> 1542K
代理商: TMUX03155
18
Agere Systems Inc.
Data Sheet
April 2001
TMUX03155 STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer
Transmit Direction Overview
(continued)
STS-1/AU-3 Inputs
(continued)
The 27 bytes of transport overhead from each STS-1/AU-3 input must be aligned* (A1-1, A1-2, A1-3 must all be
coincident from all three STS-1/AU-3 inputs) and are allocated as shown in Table 6
.
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; therefore, 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
(
TLSOOF[3—1]
,
TLSOOFD[3—1]
,
TLSOOFM[3—1]
,
TLSLOF[3—1]
,
TLSLOFD[3—1
,
TLSLOFM[3—1], 0x08,
0x11, 0x19
). Each input will be considered out-of-frame until two successive framing patterns (0xF628) separated
in time by 125 μs occur without framing byte errors. Each selected STS-1/AU-3 input will be considered in frame
until five (SDH)/four (SONET) successive frames separated in time by 125 μs occur with errored framing patterns.
The device will be considered in the LOF state when an OOF condition persists for 24
consecutive frames (3 ms)
or clear when the OOF condition is inactive for 24 consecutive frames (3 ms) with the correct framing patterns
spaced 125 μs apart.
Descramble Enable/Disable
Each selected STS-1/AU-3 input can be descrambled (
TLSDSCR[3—1], 0x3A, 0x38, 0x36
) according to the
frame synchronous descrambling sequence 1 + x
6
+ x
7
. The sequence is reset to 1111111 at the beginning of the
byte following the C1 byte and descrambles all of the STS-1/AU-3 data except the A1, A2, and J0 bytes. Writing a
logic 1 to the appropriate bit causes the selected STS-1/AU-3 signal to be descrambled.
* Can be provided by the Agere TMPR28051 mapper device.
Table 6. Expected STS-1/AU-3 Input Frame Format
Transport Overhead
Payload
Col. 1
A1
B1
D1
H1
B2
D4
D7
D10
S1
Col. 2
A2
E1
D2
H2
K1
D5
D8
D11
M0
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
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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