Chapter 3: System planning
Data throughput capacity tables
Page 3-127
TDM traffic load
Encapsulated data
The NIDU supports separate management and TDM data protocol interfaces. The management
interface is between the NIDU and a directly-connected ODU. The TDM data interface is
between peer NIDUs. The ODU does not interact with the TDM data protocol, except in as
much as it provides a separate high priority queue for encapsulated TDM data at the wireless
interface.
The wireless capacity sacrificed to carry the encapsulated TDM data is shown in
Table 134 TDM traffic load
Channels
Octets per Ethernet frame
E1 data rate (Mbit/s)
T1 data rate (Mbit/s)
1
90
2.94
2.22
2
157
5.08
3.83
3
224
7.22
5.45
4
291
9.36
7.06
5
358
11.50
8.67
6
425
13.65
10.29
7
492
15.79
11.90
8
559
17.93
13.52
In the best case (eight channels) the encapsulation has an efficiency of 91.6%.
Timing only
The resulting TDM traffic load in timing-only operation is shown in
Table 135 TDM traffic load in timing-only
Channels
Octets per Ethernet frame
E1 data rate (Mbit/s)
T1 data rate (Mbit/s)
1
64
0.53
0.40
2
64
0.53
0.40
3
64
0.53
0.40
4
64
0.53
0.40
5
64
0.53
0.40
6
64
0.53
0.40
7
65
0.54
0.40
8
71
0.58
0.44
