Datasheet
____________________________________________________ DS34S101, DS34S102, DS34S104, DS34S108
Rev: 032609 60 of 198
Figure 10-42. CESoPSN Structured-With-CAS Mapping (No Frag, T1-ESF Example)
4 4
Frame
1
Frame
2
Frame 1
Frame 2
Frame 24
L2/L3
Header
Control
Word
CRC
Ethernet
packet
TDM payload
Extended-Super-Frame boundary
4
2 42 4
2
2 2
FRG bits = 00
(no fragmentation)
4
Frame
24
A
B
C
D
TS 2
A
B
C
D
TS 4
1 byte
2
In T1 SF, the multiframe structure is composed of 2 superframes resulting total of 24 TDM frames. The CAS info at
the end of the structure contains the CAS info of the 2 corresponding superframes as well.
Figure 10-43. CESoPSN Structured-With-CAS Mapping (No Frag, T1-SF Example)
Frame 1
Frame 12
Frame 12
L2/L3
Header
Control
Word
CRC
TDM payload
Super-Frame 1
FRG bits = 00
(no fragmentation)
Super-Frame 2
4
1 24
41
24
41
24 4
1 24
Frame 1
4 bit
pading
A
1
B
1
A
2
B
2
TS 1
1 byte
1 byte
A
1
B
1
A
2
B
2
TS 4
A
1
B
1
A
2
B
2
TS 24
24
4
Frame
12
2
1
4 24
Frame
1
1
1
4 24
Frame
1
2
1
244
Frame
12
1
1
The packetization delay of a CESoPSN structured-with-CAS bundle (not fragmented) is as follows:
• Multiframed E1: T = 2 ms
• T1 SF, ESF: T = 3 ms
10.6.8.4
Structured-with-CAS (with Fragmentation)
In order to reduce the packetization delay of structured-with-CAS bundle, the CESoPSN standard supports the
option of fragmentation. In this mode, the multiframe data structure is fragmented among several packets. Each
packet contains M TDM frames of the assigned timeslots. The last packet also contains the entire multiframe CAS
substructure. Because of that, there is limited number of allowed “M” values:
• For multiframed E1: M = 1, 2, 4, 8, 16 (16 means single packet with no fragmentation)
• For T1 SF: M = 1, 2, 3, 4, 6, 8, 12, 24 (24 means single packet with no fragmentation)
• For T1 ESF: M = 1, 2, 3, 4, 6, 8, 12, 24 (24 means single packet with no fragmentation)
The packetization delay of a CESoPSN structured-with-CAS bundle (with fragmentation) is: T = M x 125 µs.