Frame Formats; Figure 10-3 Supported T1 And E1 Framing Formats; Cdm-600 Satellite Modem - Comtech EF Data CDM-600 Installation And Operation Manual
Open network satellite modem (2.4 kbps – 20 mbps)
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Also See for CDM-600:
- Operating instructions manual (232 pages) ,
- Operator's manual (44 pages) ,
- Application note (5 pages)
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CDM-600 Satellite Modem
Clock Modes and Drop and Insert (D&I)
10.5
Frame Formats
The E1 and T1 frame formats that are supported are shown in Figure 10-3:
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.
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.
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 10-3 Supported T1 and E1 Framing formats
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
10–7
Revision 7
MN/CDM600.IOM
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
30
31
30
31
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