m28529-12 Mindspeed Technologies, m28529-12 Datasheet - Page 118

• Manufacturer Part Number: m28529-12
• Description: Inverse Multiplexing For Atm Ima Family
• Manufacturer: Mindspeed Technologies

Fractional T1/E1 is also supported over the Interleaved Highway interface. Two extra signals, IHRxInDo and
IHTxInDo, are used to indicate which timeslots are active on each of the data streams. These signals should be
high for active timeslots.
Active timeslots in each case are as follows (timeslot 0 is always inactive as it is used for overhead in E1 frames,
and has no corresponding timeslot in T1 frames):
•
•
•
•
The Fractional T1/E1 logic is automatically enabled when using the Interleaved Highway interface, to provide the
necessary internal clock gating.
In this example time slots 31A and TS0B are inactive as indicated by IHRxInDo being low. If for example
38
= Stream 22, D = Stream 23.
Figure 1-38. Combined Datastreams on the Interleaved Highway
Figure 1-39. Full T1 Interleaved Highway Frame
28529-DSH-001-K
represented Interleaved highway 5, the streams would be grouped as follows: A = Stream 20, B = Stream 21, C
Full T1: timeslots 1-24 are used.
Full E1: timeslots 1-15 and 17-31 are used.
Fractional T1: subset of timeslots 1-24 is used.
Fractional E1: subset of timeslots 1-15 and 17-31 are used.
(C ontinued)
(C ontinued)
(C ontinued)
IH R xD ata
IH R xInD o
IH R xS ync
IH R xD ata
IH R xInD o
IH R xS ync
IHRxSync
IHRxInDo
IHRxData
N ote: O nly the transm t fram e structure is shown, but the receive fram e structure is identical
16
IHRxClk
A
0
A
16
B
B
0
16
0
C
C
16
0
D
D
17
A
A
1
17
1
B
B
17
C
C
1
17
D
D
1
TS31A
18
2
A
A
18
2
B
B
18
C
C
2
18
D
2
D
19
3
A
A
Figure 1-38
19
B
B
3
19
C
3
C
TS31B TS31C TS31D
19
3
D
D
Mindspeed Proprietary and Confidential
Mindspeed Technologies
20
A
A
4
20
4
B
B
20
C
C
4
20
D
D
4
21
5
A
A
shows how the datastreams are combined on the interleave highway.
B
21
5
B
C
21
5
C
21
5
D
D
22
6
A
A
22
B
B
6
22
6
C
C
22
D
D
6
23
A
A
7
7
B
23
B
23
C
C
7
23
D
D
7
24
8
A
A
24
B
B
8
TS0A
24
C
C
8
24
8
D
D
®
25
A
A
9
25
B
B
9
25
9
C
C
25
D
D
9
TS0B
10
26
A
A
10
26
B
B
10
C
26
C
10
D
26
D
11
27
A
A
27
11
B
B
TS0C
11
27
C
C
11
27
D
D
12
28
A
A
12
Functional Description
B
28
B
12
28
C
C
12
D
28
D
13
29
A
A
TS0D
13
29
B
B
13
29
C
C
13
D
29
D
14
30
A
A
14
30
B
B
14
C
30
C
14
30
D
A
15
31
A
A
Figure 1-
15
31
B
B
15
31
C
C
15
31
D
D
103