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E.6
Frame Formats
Figure E-3 shows the supported E1 and T1 Frame Formats. Note that, for D&I++, the smaller
overhead frame structure does not support CAS signaling, although E1 timeslot 16 may still be
one of the channels transmitted.
E1-CCS (Common Channel Signalling)
2048 kbps E1 Frame
1
2
3
4
Time
0
1
2
3
4
Slot
No.
Reserved for
Framing
E1-CAS (Channel Associated Signalling)
2048 kbps E1 Frame
1
2
3
4
Time
0
1
2
3
4
Slot
No.
Reserved for
Framing
T1-ESF (Extended Super Frame)
1544 kbps T1 Frame
Maximum channels to drop = 24 = 1536 kbps n x 64 kbps, n = 1,2,3,4,5,6,8,10,12,15,16,20,24
1
2
3
4
5
Time
1
2
3
4
5
Slot
No.
T1-D4 (D4 Framing)
1544 kbps T1 Frame
Maximum channels to drop = 24 = 1536 kbps n x 64 kbps, n = 1,2,3,4,5,6,8,10,12,15,16,20,24
1
2
3
4
5
Time
1
2
3
4
5
Slot
No.
Appendix E
Maximum channels to drop = 30 = 1920 kbps
5
6
7
8
9
10 11 12
13
5
6
7
8
9
10 11 12
13
Maximum channels to drop = 30 = 1920 kbps
5
6
7
8
9
10 11 12
13
5
6
7
8
9
10 11 12
13
24-Frame multi-frame structure. No IBS multi-frame signalling will be transmitted.
6
7
8
9
10 11 12 13
14
6
7
8
9
10 11 12 13
14
12-Frame multi-frame structure. No IBS multi-frame signalling will be transmitted.
6
7
8
9
10 11 12 13
14
6
7
8
9
10 11 12 13
14
Figure E-3. Supported T1 and E1 Framing Formats
CDM-425 Advanced Satellite Modem
n x 64 kbps, n = 1,2,3,4,5,6,8,10,12,15,16,20,24,30
14
15
16
17
18 19 20 21
14
15
16
17
18
19 20 21 22
May be reserved for Signalling. All signalling
information is common to all 30 TS and no signalling is
transmitted.
n x 64 kbps, n = 1,2,4,6,8,12,16,24,30
14
15
16
17
18 19 20 21
14
15
16
17
18
19 20 21 22
Reserved for Signalling. All signalling is transmitted
for TS's dropped in IBS overhead (500Hz per TS)
Signalling information in TS 16 is associated to
specific TS's.
15
16
17
18
19
20 21 22 23
15
16
17
18
19
20 21 22 23
15
16
17
18
19
20 21 22 23
15
16
17
18
19
20 21 22 23
E–7
Revision 0
22
23
24
25
26
27
28
29
23
24
25
26
27
28
29
30
22
23
24
25
26
27
28
29
23
24
25
26
27
28
29
30
24
24
24
24
MN-CDM-425
30
31
30
31
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