CDM-600 Satellite Modem

Revision 7

Clock Modes and Drop and Insert (D&I)

MN/CDM600.IOM

10.5Frame Formats

The E1 and T1 frame formats that are supported are shown in Figure 10-3:

Time

Slot

No.

E1-CCS (Common Channel Signalling)

 

 

 

 

2048 kbps E1 Frame

Maximum channels to drop = 30

= 1920 kbps

n x 64 kbps, n = 1,2,3,4,5,6,8,10,12,15,16,20,24,30

 

 

 

 

 

1

2

 

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15

 

 

16

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26

27

 

28

29

30

0

1

2

 

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16

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24

25

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28

 

29

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31

 

 

 

Reserved for

 

 

 

 

 

 

 

 

 

 

 

 

 

May be reserved for Signalling. All signalling

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Framing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

information is common to all 30 TS and no signalling is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

transmitted.

 

 

 

 

 

 

 

 

 

 

 

 

 

Time

Slot

No.

E1-CAS (Channel Associated Signalling)

 

 

 

 

2048 kbps E1 Frame

 

Maximum channels to drop = 30 = 1920 kbps

n x 64 kbps, n = 1,2,4,6,8,12,16,24,30

 

 

 

 

 

 

 

1

2

 

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16

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30

0

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28

29

30

31

 

 

 

Reserved for

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved for Signalling. All signalling is transmitted

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Framing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for TS's dropped in IBS overhead (500Hz per TS)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signalling information in TS 16 is associated to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

specific TS's.

 

 

 

 

 

 

 

 

 

 

 

 

Time

Slot

No.

T1-ESF (Extended Super Frame)

 

 

1544 kbps T1 Frame

24-Frame multi-frame structure. No IBS multi-frame signalling will be transmitted.

 

 

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

 

 

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24

 

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24

 

Time

Slot

No.

T1-D4 (D4 Framing)

 

 

1544 kbps T1 Frame

12-Frame multi-frame structure. No IBS multi-frame signalling will be transmitted.

 

 

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

 

 

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24

 

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20

21

22

23

24

 

Figure 10-3 Supported T1 and E1 Framing 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.

10–7

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Premier Mounts CDM-600 specifications Frame Formats, Supported T1 and E1 Framing formats
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