tdat04622 ETC-unknow, tdat04622 Datasheet - Page 106

• Manufacturer Part Number: tdat04622
• Description: Tdat Sonet/sdh 155/622/2488 Mbits/s Data Interfaces
• Manufacturer: ETC-unknow

TDAT042G5 SONET/SDH
155/622/2488 Mbits/s Data Interface
Functional Description
Data Engine (DE) Block
Transmit Data Engine (continued)
Tx Sequencer. The transmit sequencer maps logical channels into SONET frames, and must be provisioned prop-
erly for correct operation. The appropriate time slots must be provisioned for the rate of the payload expected for
each channel. This is done via the registers Tx_TS[1—12] (see register descriptions, page 215).
TDAT042G5 provides 12 time slots and four channels to define how data is mapped into the 48 synchronous trans-
port signals (STS-1) of an STS-48 frame or into the 12/3 STS signals of an STS-12/3 SONET frame.
Figure 17 illustrates the mapping of the 48 STS-1 signals into an STS-48 signal and their assigned time slots. Each
STS-1 block in the figure represents a byte of data for the specific STS-1 signal. The STS signals within the 12 time
slots are ordered such that the SONET multiplexing requirements of lower rate signals into higher rate signals are
satisfied. A value of 0x4 indicates that valid data is contained in the specific byte (STS) and the data is being
received/transmitted from/to channel 0.
78
Figure 17. Example of Tx/Rx Sequencer Configuration: STS-48c into Single OC-48 Signal
0 x 4
0 x 4
0 x 4
0 x 4
12
39
42
45
48
0 x 4
0 x 4
0 x 4
0 x 4
11
27
30
33
36
0 x 4
0 x 4
0 x 4
0 x 4
15
18
21
24
10
0 x 4
0 x 4
0 x 4
0 x 4
(continued)
VALID AND DIRECTED TO CHANNEL 0
12
9
3
6
9
(continued)
0 x 4
0 x 4
0 x 4
0 x 4
0 x 4
38
41
44
47
8
→
PAYLOAD LOCATIONS
0 x 4
0 x 4
0 x 4
0 x 4
26
29
32
35
7
0 x 4
0 x 4
0 x 4
0 x 4
14
17
20
23
6
0 x 4
0 x 4
0 x 4
0 x 4
11
5
2
5
8
0 x 4
0 x 4
0 x 4
0 x 4
37
40
43
46
4
0 x 4
0 x 4
0 x 4
0 x 4
25
28
31
34
3
0 x 4
0 x 4
0 x 4
0 x 4
13
16
19
22
2
0 x 4
0 x 4
0 x 4
0 x 4
10
1
1
4
7
CONFIGURE SIMILARLY
TIME-SLOT NUMBER
FOR R
T
T
T
T
X
X
X
X
_TS[12—1][15:12]
_TS[12—1][11:8]
_TS[12—1][7:4]
_TS[12—1][3:0]
REGISTER
X
SEQUENCER
Agere Systems Inc.
Data Sheet
May 2001
5-7936(F)r.3